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STM32使用USART函数源代码
/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_usart.c
* Author : MCD Application Team
* Version : V2.0.1
* Date : 06/13/2008
* Description : This file provides all the USART firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_usart.h"
#include "stm32f10x_rcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* USART UE Mask */
#define CR1_UE_Set ((u16)0x2000) /* USART Enable Mask */
#define CR1_UE_Reset ((u16)0xDFFF) /* USART Disable Mask */
/* USART WakeUp Method */
#define CR1_WAKE_Mask ((u16)0xF7FF) /* USART WakeUp Method Mask */
/* USART RWU Mask */
#define CR1_RWU_Set ((u16)0x0002) /* USART mute mode Enable Mask */
#define CR1_RWU_Reset ((u16)0xFFFD) /* USART mute mode Enable Mask */
#define CR1_SBK_Set ((u16)0x0001) /* USART Break Character send Mask */
#define CR1_CLEAR_Mask ((u16)0xE9F3) /* USART CR1 Mask */
#define CR2_Address_Mask ((u16)0xFFF0) /* USART address Mask */
/* USART LIN Mask */
#define CR2_LINEN_Set ((u16)0x4000) /* USART LIN Enable Mask */
#define CR2_LINEN_Reset ((u16)0xBFFF) /* USART LIN Disable Mask */
/* USART LIN Break detection */
#define CR2_LBDL_Mask ((u16)0xFFDF) /* USART LIN Break detection Mask */
#define CR2_STOP_CLEAR_Mask ((u16)0xCFFF) /* USART CR2 STOP Bits Mask */
#define CR2_CLOCK_CLEAR_Mask ((u16)0xF0FF) /* USART CR2 Clock Mask */
/* USART SC Mask */
#define CR3_SCEN_Set ((u16)0x0020) /* USART SC Enable Mask */
#define CR3_SCEN_Reset ((u16)0xFFDF) /* USART SC Disable Mask */
/* USART SC NACK Mask */
#define CR3_NACK_Set ((u16)0x0010) /* USART SC NACK Enable Mask */
#define CR3_NACK_Reset ((u16)0xFFEF) /* USART SC NACK Disable Mask */
/* USART Half-Duplex Mask */
#define CR3_HDSEL_Set ((u16)0x0008) /* USART Half-Duplex Enable Mask */
#define CR3_HDSEL_Reset ((u16)0xFFF7) /* USART Half-Duplex Disable Mask */
/* USART IrDA Mask */
#define CR3_IRLP_Mask ((u16)0xFFFB) /* USART IrDA LowPower mode Mask */
#define CR3_CLEAR_Mask ((u16)0xFCFF) /* USART CR3 Mask */
/* USART IrDA Mask */
#define CR3_IREN_Set ((u16)0x0002) /* USART IrDA Enable Mask */
#define CR3_IREN_Reset ((u16)0xFFFD) /* USART IrDA Disable Mask */
#define GTPR_LSB_Mask ((u16)0x00FF) /* Guard Time Register LSB Mask */
#define GTPR_MSB_Mask ((u16)0xFF00) /* Guard Time Register MSB Mask */
#define IT_Mask ((u16)0x001F) /* USART Interrupt Mask */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : USART_DeInit
* Description : Deinitializes the USARTx peripheral registers to their
* default reset values.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Output : None
* Return : None
*******************************************************************************/
void USART_DeInit(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
switch (*(u32*)&USARTx)
{
case USART1_BASE:
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
break;
case USART2_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
break;
case USART3_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
break;
case UART4_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
break;
case UART5_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
break;
default:
break;
}
}
/*******************************************************************************
* Function Name : USART_Init
* Description : Initializes the USARTx peripheral according to the specified
* parameters in the USART_InitStruct .
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_InitStruct: pointer to a USART_InitTypeDef structure
* that contains the configuration information for the
* specified USART peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
{
u32 tmpreg = 0x00, apbclock = 0x00;
u32 integerdivider = 0x00;
u32 fractionaldivider = 0x00;
u32 usartxbase = 0;
RCC_ClocksTypeDef RCC_ClocksStatus;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
/* The hardware flow control is available only for USART1, USART2 and USART3 */
assert_param(IS_USART_PERIPH_HFC(USARTx, USART_InitStruct->USART_HardwareFlowControl));
usartxbase = (*(u32*)&USARTx);
/*---------------------------- USART CR2 Configuration -----------------------*/
tmpreg = USARTx->CR2;
/* Clear STOP[13:12] bits */
tmpreg &= CR2_STOP_CLEAR_Mask;
/* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/
/* Set STOP[13:12] bits according to USART_StopBits value */
tmpreg |= (u32)USART_InitStruct->USART_StopBits;
/* Write to USART CR2 */
USARTx->CR2 = (u16)tmpreg;
/*---------------------------- USART CR1 Configuration -----------------------*/
tmpreg = USARTx->CR1;
/* Clear M, PCE, PS, TE and RE bits */
tmpreg &= CR1_CLEAR_Mask;
/* Configure the USART Word Length, Parity and mode ----------------------- */
/* Set the M bits according to USART_WordLength value */
/* Set PCE and PS bits according to USART_Parity value */
/* Set TE and RE bits according to USART_Mode value */
tmpreg |= (u32)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
USART_InitStruct->USART_Mode;
/* Write to USART CR1 */
USARTx->CR1 = (u16)tmpreg;
/*---------------------------- USART CR3 Configuration -----------------------*/
tmpreg = USARTx->CR3;
/* Clear CTSE and RTSE bits */
tmpreg &= CR3_CLEAR_Mask;
/* Configure the USART HFC -------------------------------------------------*/
/* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
/* Write to USART CR3 */
USARTx->CR3 = (u16)tmpreg;
/*---------------------------- USART BRR Configuration -----------------------*/
/* Configure the USART Baud Rate -------------------------------------------*/
RCC_GetClocksFreq(&RCC_ClocksStatus);
if (usartxbase == USART1_BASE)
{
apbclock = RCC_ClocksStatus.PCLK2_Frequency;
}
else
{
apbclock = RCC_ClocksStatus.PCLK1_Frequency;
}
/* Determine the integer part */
integerdivider = ((0x19 * apbclock) / (0x04 * (USART_InitStruct->USART_BaudRate)));
tmpreg = (integerdivider / 0x64) << 0x04;
/* Determine the fractional part */
fractionaldivider = integerdivider - (0x64 * (tmpreg >> 0x04));
tmpreg |= ((((fractionaldivider * 0x10) + 0x32) / 0x64)) & ((u8)0x0F);
/* Write to USART BRR */
USARTx->BRR = (u16)tmpreg;
}
/*******************************************************************************
* Function Name : USART_StructInit
* Description : Fills each USART_InitStruct member with its default value.
* Input : - USART_InitStruct: pointer to a USART_InitTypeDef structure
* which will be initialized.
* Output : None
* Return : None
*******************************************************************************/
void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
{
/* USART_InitStruct members default value */
USART_InitStruct->USART_BaudRate = 9600;
USART_InitStruct->USART_WordLength = USART_WordLength_8b;
USART_InitStruct->USART_StopBits = USART_StopBits_1;
USART_InitStruct->USART_Parity = USART_Parity_No ;
USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
}
/*******************************************************************************
* Function Name : USART_ClockInit
* Description : Initializes the USARTx peripheral Clock according to the
* specified parameters in the USART_ClockInitStruct .
* Input : - USARTx: where x can be 1, 2, 3 to select the USART peripheral.
* Note: The Smart Card mode is not available for UART4 and UART5.
* - USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
* structure that contains the configuration information for
* the specified USART peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
{
u32 tmpreg = 0x00;
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
/*---------------------------- USART CR2 Configuration -----------------------*/
tmpreg = USARTx->CR2;
/* Clear CLKEN, CPOL, CPHA and LBCL bits */
tmpreg &= CR2_CLOCK_CLEAR_Mask;
/* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/
/* Set CLKEN bit according to USART_Clock value */
/* Set CPOL bit according to USART_CPOL value */
/* Set CPHA bit according to USART_CPHA value */
/* Set LBCL bit according to USART_LastBit value */
tmpreg |= (u32)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
/* Write to USART CR2 */
USARTx->CR2 = (u16)tmpreg;
}
/*******************************************************************************
* Function Name : USART_ClockStructInit
* Description : Fills each USART_ClockInitStruct member with its default value.
* Input : - USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
* structure which will be initialized.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
{
/* USART_ClockInitStruct members default value */
USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
}
/*******************************************************************************
* Function Name : USART_Cmd
* Description : Enables or disables the specified USART peripheral.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* : - NewState: new state of the USARTx peripheral.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected USART by setting the UE bit in the CR1 register */
USARTx->CR1 |= CR1_UE_Set;
}
else
{
/* Disable the selected USART by clearing the UE bit in the CR1 register */
USARTx->CR1 &= CR1_UE_Reset;
}
}
/*******************************************************************************
* Function Name : USART_ITConfig
* Description : Enables or disables the specified USART interrupts.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IT: specifies the USART interrupt sources to be
* enabled or disabled.
* This parameter can be one of the following values:
* - USART_IT_CTS: CTS change interrupt (not available for
* UART4 and UART5)
* - USART_IT_LBD: LIN Break detection interrupt
* - USART_IT_TXE: Tansmit Data Register empty interrupt
* - USART_IT_TC: Transmission complete interrupt
* - USART_IT_RXNE: Receive Data register not empty
* interrupt
* - USART_IT_IDLE: Idle line detection interrupt
* - USART_IT_PE: Parity Error interrupt
* - USART_IT_ERR: Error interrupt(Frame error, noise
* error, overrun error)
* - NewState: new state of the specified USARTx interrupts.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_ITConfig(USART_TypeDef* USARTx, u16 USART_IT, FunctionalState NewState)
{
u32 usartreg = 0x00, itpos = 0x00, itmask = 0x00;
u32 usartxbase = 0x00;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_CONFIG_IT(USART_IT));
assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
assert_param(IS_FUNCTIONAL_STATE(NewState));
usartxbase = (*(u32*)&(USARTx));
/* Get the USART register index */
usartreg = (((u8)USART_IT) >> 0x05);
/* Get the interrupt position */
itpos = USART_IT & IT_Mask;
itmask = (((u32)0x01) << itpos);
if (usartreg == 0x01) /* The IT is in CR1 register */
{
usartxbase += 0x0C;
}
else if (usartreg == 0x02) /* The IT is in CR2 register */
{
usartxbase += 0x10;
}
else /* The IT is in CR3 register */
{
usartxbase += 0x14;
}
if (NewState != DISABLE)
{
*(vu32*)usartxbase |= itmask;
}
else
{
*(vu32*)usartxbase &= ~itmask;
}
}
/*******************************************************************************
* Function Name : USART_DMACmd
* Description : Enables or disables the USART抯 DMA interface.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3 or UART4.
* Note: The DMA mode is not available for UART5.
* - USART_DMAReq: specifies the DMA request.
* This parameter can be any combination of the following values:
* - USART_DMAReq_Tx: USART DMA transmit request
* - USART_DMAReq_Rx: USART DMA receive request
* - NewState: new state of the DMA Request sources.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_DMACmd(USART_TypeDef* USARTx, u16 USART_DMAReq, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_1234_PERIPH(USARTx));
assert_param(IS_USART_DMAREQ(USART_DMAReq));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the DMA transfer for selected requests by setting the DMAT and/or
DMAR bits in the USART CR3 register */
USARTx->CR3 |= USART_DMAReq;
}
else
{
/* Disable the DMA transfer for selected requests by clearing the DMAT and/or
DMAR bits in the USART CR3 register */
USARTx->CR3 &= (u16)~USART_DMAReq;
}
}
/*******************************************************************************
* Function Name : USART_SetAddress
* Description : Sets the address of the USART node.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_Address: Indicates the address of the USART node.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetAddress(USART_TypeDef* USARTx, u8 USART_Address)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_ADDRESS(USART_Address));
/* Clear the USART address */
USARTx->CR2 &= CR2_Address_Mask;
/* Set the USART address node */
USARTx->CR2 |= USART_Address;
}
/*******************************************************************************
* Function Name : USART_WakeUpConfig
* Description : Selects the USART WakeUp method.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_WakeUp: specifies the USART wakeup method.
* This parameter can be one of the following values:
* - USART_WakeUp_IdleLine: WakeUp by an idle line detection
* - USART_WakeUp_AddressMark: WakeUp by an address mark
* Output : None
* Return : None
*******************************************************************************/
void USART_WakeUpConfig(USART_TypeDef* USARTx, u16 USART_WakeUp)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_WAKEUP(USART_WakeUp));
USARTx->CR1 &= CR1_WAKE_Mask;
USARTx->CR1 |= USART_WakeUp;
}
/*******************************************************************************
* Function Name : USART_ReceiverWakeUpCmd
* Description : Determines if the USART is in mute mode or not.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the USART mute mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the USART mute mode by setting the RWU bit in the CR1 register */
USARTx->CR1 |= CR1_RWU_Set;
}
else
{
/* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
USARTx->CR1 &= CR1_RWU_Reset;
}
}
/*******************************************************************************
* Function Name : USART_LINBreakDetectLengthConfig
* Description : Sets the USART LIN Break detection length.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_LINBreakDetectLength: specifies the LIN break
* detection length.
* This parameter can be one of the following values:
* - USART_LINBreakDetectLength_10b: 10-bit break detection
* - USART_LINBreakDetectLength_11b: 11-bit break detection
* Output : None
* Return : None
*******************************************************************************/
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, u16 USART_LINBreakDetectLength)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
USARTx->CR2 &= CR2_LBDL_Mask;
USARTx->CR2 |= USART_LINBreakDetectLength;
}
/*******************************************************************************
* Function Name : USART_LINCmd
* Description : Enables or disables the USART抯 LIN mode.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the USART LIN mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the LIN mode by setting the LINEN bit in the CR2 register */
USARTx->CR2 |= CR2_LINEN_Set;
}
else
{
/* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
USARTx->CR2 &= CR2_LINEN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_SendData
* Description : Transmits single data through the USARTx peripheral.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - Data: the data to transmit.
* Output : None
* Return : None
*******************************************************************************/
void USART_SendData(USART_TypeDef* USARTx, u16 Data)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_DATA(Data));
/* Transmit Data */
USARTx->DR = (Data & (u16)0x01FF);
}
/*******************************************************************************
* Function Name : USART_ReceiveData
* Description : Returns the most recent received data by the USARTx peripheral.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Output : None
* Return : The received data.
*******************************************************************************/
u16 USART_ReceiveData(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Receive Data */
return (u16)(USARTx->DR & (u16)0x01FF);
}
/*******************************************************************************
* Function Name : USART_SendBreak
* Description : Transmits break characters.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Output : None
* Return : None
*******************************************************************************/
void USART_SendBreak(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Send break characters */
USARTx->CR1 |= CR1_SBK_Set;
}
/*******************************************************************************
* Function Name : USART_SetGuardTime
* Description : Sets the specified USART guard time.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Note: The guard time bits are not available for UART4 and UART5.
* - USART_GuardTime: specifies the guard time.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetGuardTime(USART_TypeDef* USARTx, u8 USART_GuardTime)
{
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
/* Clear the USART Guard time */
USARTx->GTPR &= GTPR_LSB_Mask;
/* Set the USART guard time */
USARTx->GTPR |= (u16)((u16)USART_GuardTime << 0x08);
}
/*******************************************************************************
* Function Name : USART_SetPrescaler
* Description : Sets the system clock prescaler.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Note: The function is used for IrDA mode with UART4 and UART5.
* - USART_Prescaler: specifies the prescaler clock.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetPrescaler(USART_TypeDef* USARTx, u8 USART_Prescaler)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Clear the USART prescaler */
USARTx->GTPR &= GTPR_MSB_Mask;
/* Set the USART prescaler */
USARTx->GTPR |= USART_Prescaler;
}
/*******************************************************************************
* Function Name : USART_SmartCardCmd
* Description : Enables or disables the USART抯 Smart Card mode.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Note: The Smart Card mode is not available for UART4 and UART5.
* - NewState: new state of the Smart Card mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the SC mode by setting the SCEN bit in the CR3 register */
USARTx->CR3 |= CR3_SCEN_Set;
}
else
{
/* Disable the SC mode by clearing the SCEN bit in the CR3 register */
USARTx->CR3 &= CR3_SCEN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_SmartCardNACKCmd
* Description : Enables or disables NACK transmission.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Note: The Smart Card mode is not available for UART4 and UART5.
* - NewState: new state of the NACK transmission.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the NACK transmission by setting the NACK bit in the CR3 register */
USARTx->CR3 |= CR3_NACK_Set;
}
else
{
/* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
USARTx->CR3 &= CR3_NACK_Reset;
}
}
/*******************************************************************************
* Function Name : USART_HalfDuplexCmd
* Description : Enables or disables the USART抯 Half Duplex communication.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the USART Communication.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
USARTx->CR3 |= CR3_HDSEL_Set;
}
else
{
/* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
USARTx->CR3 &= CR3_HDSEL_Reset;
}
}
/*******************************************************************************
* Function Name : USART_IrDAConfig
* Description : Configures the USART抯 IrDA interface.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IrDAMode: specifies the IrDA mode.
* This parameter can be one of the following values:
* - USART_IrDAMode_LowPower
* - USART_IrDAMode_Normal
* Output : None
* Return : None
*******************************************************************************/
void USART_IrDAConfig(USART_TypeDef* USARTx, u16 USART_IrDAMode)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
USARTx->CR3 &= CR3_IRLP_Mask;
USARTx->CR3 |= USART_IrDAMode;
}
/*******************************************************************************
* Function Name : USART_IrDACmd
* Description : Enables or disables the USART抯 IrDA interface.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the IrDA mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the IrDA mode by setting the IREN bit in the CR3 register */
USARTx->CR3 |= CR3_IREN_Set;
}
else
{
/* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
USARTx->CR3 &= CR3_IREN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_GetFlagStatus
* Description : Checks whether the specified USART flag is set or not.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - USART_FLAG_CTS: CTS Change flag (not available for
* UART4 and UART5)
* - USART_FLAG_LBD: LIN Break detection flag
* - USART_FLAG_TXE: Transmit data register empty flag
* - USART_FLAG_TC: Transmission Complete flag
* - USART_FLAG_RXNE: Receive data register not empty flag
* - USART_FLAG_IDLE: Idle Line detection flag
* - USART_FLAG_ORE: OverRun Error flag
* - USART_FLAG_NE: Noise Error flag
* - USART_FLAG_FE: Framing Error flag
* - USART_FLAG_PE: Parity Error flag
* Output : None
* Return : The new state of USART_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, u16 USART_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_FLAG(USART_FLAG));
assert_param(IS_USART_PERIPH_FLAG(USARTx, USART_FLAG)); /* The CTS flag is not available for UART4 and UART5 */
if ((USARTx->SR & USART_FLAG) != (u16)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : USART_ClearFlag
* Description : Clears the USARTx's pending flags.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_FLAG: specifies the flag to clear.
* This parameter can be any combination of the following values:
* - USART_FLAG_CTS: CTS Change flag (not available for
* UART4 and UART5).
* - USART_FLAG_LBD: LIN Break detection flag.
* - USART_FLAG_TC: Transmission Complete flag.
* - USART_FLAG_RXNE: Receive data register not empty flag.
* - USART_FLAG_IDLE: Idle Line detection flag.
* - USART_FLAG_ORE: OverRun Error flag.
* - USART_FLAG_NE: Noise Error flag.
* - USART_FLAG_FE: Framing Error flag.
* - USART_FLAG_PE: Parity Error flag.
*
* Note: - For IDLE, ORE, NE, FE and PE flags user has to read
* the USART DR register after calling this function.
* - TXE flag can't be cleared by this function, it's
* cleared only by a write to the USART DR register.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClearFlag(USART_TypeDef* USARTx, u16 USART_FLAG)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
assert_param(IS_USART_PERIPH_FLAG(USARTx, USART_FLAG)); /* The CTS flag is not available for UART4 and UART5 */
USARTx->SR = (u16)~USART_FLAG;
}
/*******************************************************************************
* Function Name : USART_GetITStatus
* Description : Checks whether the specified USART interrupt has occurred or not.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IT: specifies the USART interrupt source to check.
* This parameter can be one of the following values:
* - USART_IT_CTS: CTS change interrupt (not available for
* UART4 and UART5)
* - USART_IT_LBD: LIN Break detection interrupt
* - USART_IT_TXE: Tansmit Data Register empty interrupt
* - USART_IT_TC: Transmission complete interrupt
* - USART_IT_RXNE: Receive Data register not empty
* interrupt
* - USART_IT_IDLE: Idle line detection interrupt
* - USART_IT_ORE: OverRun Error interrupt
* - USART_IT_NE: Noise Error interrupt
* - USART_IT_FE: Framing Error interrupt
* - USART_IT_PE: Parity Error interrupt
* Output : None
* Return : The new state of USART_IT (SET or RESET).
*******************************************************************************/
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, u16 USART_IT)
{
u32 bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
ITStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_IT(USART_IT));
assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
/* Get the USART register index */
usartreg = (((u8)USART_IT) >> 0x05);
/* Get the interrupt position */
itmask = USART_IT & IT_Mask;
itmask = (u32)0x01 << itmask;
if (usartreg == 0x01) /* The IT is in CR1 register */
{
itmask &= USARTx->CR1;
}
else if (usartreg == 0x02) /* The IT is in CR2 register */
{
itmask &= USARTx->CR2;
}
else /* The IT is in CR3 register */
{
itmask &= USARTx->CR3;
}
bitpos = USART_IT >> 0x08;
bitpos = (u32)0x01 << bitpos;
bitpos &= USARTx->SR;
if ((itmask != (u16)RESET)&&(bitpos != (u16)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : USART_ClearITPendingBit
* Description : Clears the USARTx抯 interrupt pending bits.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IT: specifies the interrupt pending bit to clear.
* This parameter can be one of the following values:
* - USART_IT_CTS: CTS change interrupt (not available for
* UART4 and UART5)
* - USART_IT_LBD: LIN Break detection interrupt
* - USART_IT_TC: Transmission complete interrupt.
* - USART_IT_RXNE: Receive Data register not empty interrupt.
* - USART_IT_IDLE: Idle line detection interrupt.
* - USART_IT_ORE: OverRun Error interrupt.
* - USART_IT_NE: Noise Error interrupt.
* - USART_IT_FE: Framing Error interrupt.
* - USART_IT_PE: Parity Error interrupt.
*
* Note: - For IDLE, ORE, NE, FE and PE pending bits user has to
* read the USART DR register after calling this function.
* - TXE pending bit can't be cleared by this function, it's
* cleared only by a write to the USART DR register.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClearITPendingBit(USART_TypeDef* USARTx, u16 USART_IT)
{
u16 bitpos = 0x00, itmask = 0x00;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_CLEAR_IT(USART_IT));
assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
bitpos = USART_IT >> 0x08;
itmask = (u16)((u16)0x01 << bitpos);
USARTx->SR = (u16)~itmask;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
* File Name : stm32f10x_usart.c
* Author : MCD Application Team
* Version : V2.0.1
* Date : 06/13/2008
* Description : This file provides all the USART firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_usart.h"
#include "stm32f10x_rcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* USART UE Mask */
#define CR1_UE_Set ((u16)0x2000) /* USART Enable Mask */
#define CR1_UE_Reset ((u16)0xDFFF) /* USART Disable Mask */
/* USART WakeUp Method */
#define CR1_WAKE_Mask ((u16)0xF7FF) /* USART WakeUp Method Mask */
/* USART RWU Mask */
#define CR1_RWU_Set ((u16)0x0002) /* USART mute mode Enable Mask */
#define CR1_RWU_Reset ((u16)0xFFFD) /* USART mute mode Enable Mask */
#define CR1_SBK_Set ((u16)0x0001) /* USART Break Character send Mask */
#define CR1_CLEAR_Mask ((u16)0xE9F3) /* USART CR1 Mask */
#define CR2_Address_Mask ((u16)0xFFF0) /* USART address Mask */
/* USART LIN Mask */
#define CR2_LINEN_Set ((u16)0x4000) /* USART LIN Enable Mask */
#define CR2_LINEN_Reset ((u16)0xBFFF) /* USART LIN Disable Mask */
/* USART LIN Break detection */
#define CR2_LBDL_Mask ((u16)0xFFDF) /* USART LIN Break detection Mask */
#define CR2_STOP_CLEAR_Mask ((u16)0xCFFF) /* USART CR2 STOP Bits Mask */
#define CR2_CLOCK_CLEAR_Mask ((u16)0xF0FF) /* USART CR2 Clock Mask */
/* USART SC Mask */
#define CR3_SCEN_Set ((u16)0x0020) /* USART SC Enable Mask */
#define CR3_SCEN_Reset ((u16)0xFFDF) /* USART SC Disable Mask */
/* USART SC NACK Mask */
#define CR3_NACK_Set ((u16)0x0010) /* USART SC NACK Enable Mask */
#define CR3_NACK_Reset ((u16)0xFFEF) /* USART SC NACK Disable Mask */
/* USART Half-Duplex Mask */
#define CR3_HDSEL_Set ((u16)0x0008) /* USART Half-Duplex Enable Mask */
#define CR3_HDSEL_Reset ((u16)0xFFF7) /* USART Half-Duplex Disable Mask */
/* USART IrDA Mask */
#define CR3_IRLP_Mask ((u16)0xFFFB) /* USART IrDA LowPower mode Mask */
#define CR3_CLEAR_Mask ((u16)0xFCFF) /* USART CR3 Mask */
/* USART IrDA Mask */
#define CR3_IREN_Set ((u16)0x0002) /* USART IrDA Enable Mask */
#define CR3_IREN_Reset ((u16)0xFFFD) /* USART IrDA Disable Mask */
#define GTPR_LSB_Mask ((u16)0x00FF) /* Guard Time Register LSB Mask */
#define GTPR_MSB_Mask ((u16)0xFF00) /* Guard Time Register MSB Mask */
#define IT_Mask ((u16)0x001F) /* USART Interrupt Mask */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : USART_DeInit
* Description : Deinitializes the USARTx peripheral registers to their
* default reset values.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Output : None
* Return : None
*******************************************************************************/
void USART_DeInit(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
switch (*(u32*)&USARTx)
{
case USART1_BASE:
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
break;
case USART2_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
break;
case USART3_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
break;
case UART4_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
break;
case UART5_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
break;
default:
break;
}
}
/*******************************************************************************
* Function Name : USART_Init
* Description : Initializes the USARTx peripheral according to the specified
* parameters in the USART_InitStruct .
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_InitStruct: pointer to a USART_InitTypeDef structure
* that contains the configuration information for the
* specified USART peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
{
u32 tmpreg = 0x00, apbclock = 0x00;
u32 integerdivider = 0x00;
u32 fractionaldivider = 0x00;
u32 usartxbase = 0;
RCC_ClocksTypeDef RCC_ClocksStatus;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
/* The hardware flow control is available only for USART1, USART2 and USART3 */
assert_param(IS_USART_PERIPH_HFC(USARTx, USART_InitStruct->USART_HardwareFlowControl));
usartxbase = (*(u32*)&USARTx);
/*---------------------------- USART CR2 Configuration -----------------------*/
tmpreg = USARTx->CR2;
/* Clear STOP[13:12] bits */
tmpreg &= CR2_STOP_CLEAR_Mask;
/* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/
/* Set STOP[13:12] bits according to USART_StopBits value */
tmpreg |= (u32)USART_InitStruct->USART_StopBits;
/* Write to USART CR2 */
USARTx->CR2 = (u16)tmpreg;
/*---------------------------- USART CR1 Configuration -----------------------*/
tmpreg = USARTx->CR1;
/* Clear M, PCE, PS, TE and RE bits */
tmpreg &= CR1_CLEAR_Mask;
/* Configure the USART Word Length, Parity and mode ----------------------- */
/* Set the M bits according to USART_WordLength value */
/* Set PCE and PS bits according to USART_Parity value */
/* Set TE and RE bits according to USART_Mode value */
tmpreg |= (u32)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
USART_InitStruct->USART_Mode;
/* Write to USART CR1 */
USARTx->CR1 = (u16)tmpreg;
/*---------------------------- USART CR3 Configuration -----------------------*/
tmpreg = USARTx->CR3;
/* Clear CTSE and RTSE bits */
tmpreg &= CR3_CLEAR_Mask;
/* Configure the USART HFC -------------------------------------------------*/
/* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
/* Write to USART CR3 */
USARTx->CR3 = (u16)tmpreg;
/*---------------------------- USART BRR Configuration -----------------------*/
/* Configure the USART Baud Rate -------------------------------------------*/
RCC_GetClocksFreq(&RCC_ClocksStatus);
if (usartxbase == USART1_BASE)
{
apbclock = RCC_ClocksStatus.PCLK2_Frequency;
}
else
{
apbclock = RCC_ClocksStatus.PCLK1_Frequency;
}
/* Determine the integer part */
integerdivider = ((0x19 * apbclock) / (0x04 * (USART_InitStruct->USART_BaudRate)));
tmpreg = (integerdivider / 0x64) << 0x04;
/* Determine the fractional part */
fractionaldivider = integerdivider - (0x64 * (tmpreg >> 0x04));
tmpreg |= ((((fractionaldivider * 0x10) + 0x32) / 0x64)) & ((u8)0x0F);
/* Write to USART BRR */
USARTx->BRR = (u16)tmpreg;
}
/*******************************************************************************
* Function Name : USART_StructInit
* Description : Fills each USART_InitStruct member with its default value.
* Input : - USART_InitStruct: pointer to a USART_InitTypeDef structure
* which will be initialized.
* Output : None
* Return : None
*******************************************************************************/
void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
{
/* USART_InitStruct members default value */
USART_InitStruct->USART_BaudRate = 9600;
USART_InitStruct->USART_WordLength = USART_WordLength_8b;
USART_InitStruct->USART_StopBits = USART_StopBits_1;
USART_InitStruct->USART_Parity = USART_Parity_No ;
USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
}
/*******************************************************************************
* Function Name : USART_ClockInit
* Description : Initializes the USARTx peripheral Clock according to the
* specified parameters in the USART_ClockInitStruct .
* Input : - USARTx: where x can be 1, 2, 3 to select the USART peripheral.
* Note: The Smart Card mode is not available for UART4 and UART5.
* - USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
* structure that contains the configuration information for
* the specified USART peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
{
u32 tmpreg = 0x00;
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
/*---------------------------- USART CR2 Configuration -----------------------*/
tmpreg = USARTx->CR2;
/* Clear CLKEN, CPOL, CPHA and LBCL bits */
tmpreg &= CR2_CLOCK_CLEAR_Mask;
/* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/
/* Set CLKEN bit according to USART_Clock value */
/* Set CPOL bit according to USART_CPOL value */
/* Set CPHA bit according to USART_CPHA value */
/* Set LBCL bit according to USART_LastBit value */
tmpreg |= (u32)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
/* Write to USART CR2 */
USARTx->CR2 = (u16)tmpreg;
}
/*******************************************************************************
* Function Name : USART_ClockStructInit
* Description : Fills each USART_ClockInitStruct member with its default value.
* Input : - USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
* structure which will be initialized.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
{
/* USART_ClockInitStruct members default value */
USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
}
/*******************************************************************************
* Function Name : USART_Cmd
* Description : Enables or disables the specified USART peripheral.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* : - NewState: new state of the USARTx peripheral.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected USART by setting the UE bit in the CR1 register */
USARTx->CR1 |= CR1_UE_Set;
}
else
{
/* Disable the selected USART by clearing the UE bit in the CR1 register */
USARTx->CR1 &= CR1_UE_Reset;
}
}
/*******************************************************************************
* Function Name : USART_ITConfig
* Description : Enables or disables the specified USART interrupts.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IT: specifies the USART interrupt sources to be
* enabled or disabled.
* This parameter can be one of the following values:
* - USART_IT_CTS: CTS change interrupt (not available for
* UART4 and UART5)
* - USART_IT_LBD: LIN Break detection interrupt
* - USART_IT_TXE: Tansmit Data Register empty interrupt
* - USART_IT_TC: Transmission complete interrupt
* - USART_IT_RXNE: Receive Data register not empty
* interrupt
* - USART_IT_IDLE: Idle line detection interrupt
* - USART_IT_PE: Parity Error interrupt
* - USART_IT_ERR: Error interrupt(Frame error, noise
* error, overrun error)
* - NewState: new state of the specified USARTx interrupts.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_ITConfig(USART_TypeDef* USARTx, u16 USART_IT, FunctionalState NewState)
{
u32 usartreg = 0x00, itpos = 0x00, itmask = 0x00;
u32 usartxbase = 0x00;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_CONFIG_IT(USART_IT));
assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
assert_param(IS_FUNCTIONAL_STATE(NewState));
usartxbase = (*(u32*)&(USARTx));
/* Get the USART register index */
usartreg = (((u8)USART_IT) >> 0x05);
/* Get the interrupt position */
itpos = USART_IT & IT_Mask;
itmask = (((u32)0x01) << itpos);
if (usartreg == 0x01) /* The IT is in CR1 register */
{
usartxbase += 0x0C;
}
else if (usartreg == 0x02) /* The IT is in CR2 register */
{
usartxbase += 0x10;
}
else /* The IT is in CR3 register */
{
usartxbase += 0x14;
}
if (NewState != DISABLE)
{
*(vu32*)usartxbase |= itmask;
}
else
{
*(vu32*)usartxbase &= ~itmask;
}
}
/*******************************************************************************
* Function Name : USART_DMACmd
* Description : Enables or disables the USART抯 DMA interface.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3 or UART4.
* Note: The DMA mode is not available for UART5.
* - USART_DMAReq: specifies the DMA request.
* This parameter can be any combination of the following values:
* - USART_DMAReq_Tx: USART DMA transmit request
* - USART_DMAReq_Rx: USART DMA receive request
* - NewState: new state of the DMA Request sources.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_DMACmd(USART_TypeDef* USARTx, u16 USART_DMAReq, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_1234_PERIPH(USARTx));
assert_param(IS_USART_DMAREQ(USART_DMAReq));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the DMA transfer for selected requests by setting the DMAT and/or
DMAR bits in the USART CR3 register */
USARTx->CR3 |= USART_DMAReq;
}
else
{
/* Disable the DMA transfer for selected requests by clearing the DMAT and/or
DMAR bits in the USART CR3 register */
USARTx->CR3 &= (u16)~USART_DMAReq;
}
}
/*******************************************************************************
* Function Name : USART_SetAddress
* Description : Sets the address of the USART node.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_Address: Indicates the address of the USART node.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetAddress(USART_TypeDef* USARTx, u8 USART_Address)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_ADDRESS(USART_Address));
/* Clear the USART address */
USARTx->CR2 &= CR2_Address_Mask;
/* Set the USART address node */
USARTx->CR2 |= USART_Address;
}
/*******************************************************************************
* Function Name : USART_WakeUpConfig
* Description : Selects the USART WakeUp method.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_WakeUp: specifies the USART wakeup method.
* This parameter can be one of the following values:
* - USART_WakeUp_IdleLine: WakeUp by an idle line detection
* - USART_WakeUp_AddressMark: WakeUp by an address mark
* Output : None
* Return : None
*******************************************************************************/
void USART_WakeUpConfig(USART_TypeDef* USARTx, u16 USART_WakeUp)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_WAKEUP(USART_WakeUp));
USARTx->CR1 &= CR1_WAKE_Mask;
USARTx->CR1 |= USART_WakeUp;
}
/*******************************************************************************
* Function Name : USART_ReceiverWakeUpCmd
* Description : Determines if the USART is in mute mode or not.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the USART mute mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the USART mute mode by setting the RWU bit in the CR1 register */
USARTx->CR1 |= CR1_RWU_Set;
}
else
{
/* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
USARTx->CR1 &= CR1_RWU_Reset;
}
}
/*******************************************************************************
* Function Name : USART_LINBreakDetectLengthConfig
* Description : Sets the USART LIN Break detection length.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_LINBreakDetectLength: specifies the LIN break
* detection length.
* This parameter can be one of the following values:
* - USART_LINBreakDetectLength_10b: 10-bit break detection
* - USART_LINBreakDetectLength_11b: 11-bit break detection
* Output : None
* Return : None
*******************************************************************************/
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, u16 USART_LINBreakDetectLength)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
USARTx->CR2 &= CR2_LBDL_Mask;
USARTx->CR2 |= USART_LINBreakDetectLength;
}
/*******************************************************************************
* Function Name : USART_LINCmd
* Description : Enables or disables the USART抯 LIN mode.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the USART LIN mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the LIN mode by setting the LINEN bit in the CR2 register */
USARTx->CR2 |= CR2_LINEN_Set;
}
else
{
/* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
USARTx->CR2 &= CR2_LINEN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_SendData
* Description : Transmits single data through the USARTx peripheral.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - Data: the data to transmit.
* Output : None
* Return : None
*******************************************************************************/
void USART_SendData(USART_TypeDef* USARTx, u16 Data)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_DATA(Data));
/* Transmit Data */
USARTx->DR = (Data & (u16)0x01FF);
}
/*******************************************************************************
* Function Name : USART_ReceiveData
* Description : Returns the most recent received data by the USARTx peripheral.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Output : None
* Return : The received data.
*******************************************************************************/
u16 USART_ReceiveData(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Receive Data */
return (u16)(USARTx->DR & (u16)0x01FF);
}
/*******************************************************************************
* Function Name : USART_SendBreak
* Description : Transmits break characters.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Output : None
* Return : None
*******************************************************************************/
void USART_SendBreak(USART_TypeDef* USARTx)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Send break characters */
USARTx->CR1 |= CR1_SBK_Set;
}
/*******************************************************************************
* Function Name : USART_SetGuardTime
* Description : Sets the specified USART guard time.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Note: The guard time bits are not available for UART4 and UART5.
* - USART_GuardTime: specifies the guard time.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetGuardTime(USART_TypeDef* USARTx, u8 USART_GuardTime)
{
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
/* Clear the USART Guard time */
USARTx->GTPR &= GTPR_LSB_Mask;
/* Set the USART guard time */
USARTx->GTPR |= (u16)((u16)USART_GuardTime << 0x08);
}
/*******************************************************************************
* Function Name : USART_SetPrescaler
* Description : Sets the system clock prescaler.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* Note: The function is used for IrDA mode with UART4 and UART5.
* - USART_Prescaler: specifies the prescaler clock.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetPrescaler(USART_TypeDef* USARTx, u8 USART_Prescaler)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
/* Clear the USART prescaler */
USARTx->GTPR &= GTPR_MSB_Mask;
/* Set the USART prescaler */
USARTx->GTPR |= USART_Prescaler;
}
/*******************************************************************************
* Function Name : USART_SmartCardCmd
* Description : Enables or disables the USART抯 Smart Card mode.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Note: The Smart Card mode is not available for UART4 and UART5.
* - NewState: new state of the Smart Card mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the SC mode by setting the SCEN bit in the CR3 register */
USARTx->CR3 |= CR3_SCEN_Set;
}
else
{
/* Disable the SC mode by clearing the SCEN bit in the CR3 register */
USARTx->CR3 &= CR3_SCEN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_SmartCardNACKCmd
* Description : Enables or disables NACK transmission.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Note: The Smart Card mode is not available for UART4 and UART5.
* - NewState: new state of the NACK transmission.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_123_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the NACK transmission by setting the NACK bit in the CR3 register */
USARTx->CR3 |= CR3_NACK_Set;
}
else
{
/* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
USARTx->CR3 &= CR3_NACK_Reset;
}
}
/*******************************************************************************
* Function Name : USART_HalfDuplexCmd
* Description : Enables or disables the USART抯 Half Duplex communication.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the USART Communication.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
USARTx->CR3 |= CR3_HDSEL_Set;
}
else
{
/* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
USARTx->CR3 &= CR3_HDSEL_Reset;
}
}
/*******************************************************************************
* Function Name : USART_IrDAConfig
* Description : Configures the USART抯 IrDA interface.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IrDAMode: specifies the IrDA mode.
* This parameter can be one of the following values:
* - USART_IrDAMode_LowPower
* - USART_IrDAMode_Normal
* Output : None
* Return : None
*******************************************************************************/
void USART_IrDAConfig(USART_TypeDef* USARTx, u16 USART_IrDAMode)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
USARTx->CR3 &= CR3_IRLP_Mask;
USARTx->CR3 |= USART_IrDAMode;
}
/*******************************************************************************
* Function Name : USART_IrDACmd
* Description : Enables or disables the USART抯 IrDA interface.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - NewState: new state of the IrDA mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the IrDA mode by setting the IREN bit in the CR3 register */
USARTx->CR3 |= CR3_IREN_Set;
}
else
{
/* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
USARTx->CR3 &= CR3_IREN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_GetFlagStatus
* Description : Checks whether the specified USART flag is set or not.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - USART_FLAG_CTS: CTS Change flag (not available for
* UART4 and UART5)
* - USART_FLAG_LBD: LIN Break detection flag
* - USART_FLAG_TXE: Transmit data register empty flag
* - USART_FLAG_TC: Transmission Complete flag
* - USART_FLAG_RXNE: Receive data register not empty flag
* - USART_FLAG_IDLE: Idle Line detection flag
* - USART_FLAG_ORE: OverRun Error flag
* - USART_FLAG_NE: Noise Error flag
* - USART_FLAG_FE: Framing Error flag
* - USART_FLAG_PE: Parity Error flag
* Output : None
* Return : The new state of USART_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, u16 USART_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_FLAG(USART_FLAG));
assert_param(IS_USART_PERIPH_FLAG(USARTx, USART_FLAG)); /* The CTS flag is not available for UART4 and UART5 */
if ((USARTx->SR & USART_FLAG) != (u16)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : USART_ClearFlag
* Description : Clears the USARTx's pending flags.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_FLAG: specifies the flag to clear.
* This parameter can be any combination of the following values:
* - USART_FLAG_CTS: CTS Change flag (not available for
* UART4 and UART5).
* - USART_FLAG_LBD: LIN Break detection flag.
* - USART_FLAG_TC: Transmission Complete flag.
* - USART_FLAG_RXNE: Receive data register not empty flag.
* - USART_FLAG_IDLE: Idle Line detection flag.
* - USART_FLAG_ORE: OverRun Error flag.
* - USART_FLAG_NE: Noise Error flag.
* - USART_FLAG_FE: Framing Error flag.
* - USART_FLAG_PE: Parity Error flag.
*
* Note: - For IDLE, ORE, NE, FE and PE flags user has to read
* the USART DR register after calling this function.
* - TXE flag can't be cleared by this function, it's
* cleared only by a write to the USART DR register.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClearFlag(USART_TypeDef* USARTx, u16 USART_FLAG)
{
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
assert_param(IS_USART_PERIPH_FLAG(USARTx, USART_FLAG)); /* The CTS flag is not available for UART4 and UART5 */
USARTx->SR = (u16)~USART_FLAG;
}
/*******************************************************************************
* Function Name : USART_GetITStatus
* Description : Checks whether the specified USART interrupt has occurred or not.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IT: specifies the USART interrupt source to check.
* This parameter can be one of the following values:
* - USART_IT_CTS: CTS change interrupt (not available for
* UART4 and UART5)
* - USART_IT_LBD: LIN Break detection interrupt
* - USART_IT_TXE: Tansmit Data Register empty interrupt
* - USART_IT_TC: Transmission complete interrupt
* - USART_IT_RXNE: Receive Data register not empty
* interrupt
* - USART_IT_IDLE: Idle line detection interrupt
* - USART_IT_ORE: OverRun Error interrupt
* - USART_IT_NE: Noise Error interrupt
* - USART_IT_FE: Framing Error interrupt
* - USART_IT_PE: Parity Error interrupt
* Output : None
* Return : The new state of USART_IT (SET or RESET).
*******************************************************************************/
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, u16 USART_IT)
{
u32 bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
ITStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_IT(USART_IT));
assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
/* Get the USART register index */
usartreg = (((u8)USART_IT) >> 0x05);
/* Get the interrupt position */
itmask = USART_IT & IT_Mask;
itmask = (u32)0x01 << itmask;
if (usartreg == 0x01) /* The IT is in CR1 register */
{
itmask &= USARTx->CR1;
}
else if (usartreg == 0x02) /* The IT is in CR2 register */
{
itmask &= USARTx->CR2;
}
else /* The IT is in CR3 register */
{
itmask &= USARTx->CR3;
}
bitpos = USART_IT >> 0x08;
bitpos = (u32)0x01 << bitpos;
bitpos &= USARTx->SR;
if ((itmask != (u16)RESET)&&(bitpos != (u16)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : USART_ClearITPendingBit
* Description : Clears the USARTx抯 interrupt pending bits.
* Input : - USARTx: Select the USART or the UART peripheral.
* This parameter can be one of the following values:
* - USART1, USART2, USART3, UART4 or UART5.
* - USART_IT: specifies the interrupt pending bit to clear.
* This parameter can be one of the following values:
* - USART_IT_CTS: CTS change interrupt (not available for
* UART4 and UART5)
* - USART_IT_LBD: LIN Break detection interrupt
* - USART_IT_TC: Transmission complete interrupt.
* - USART_IT_RXNE: Receive Data register not empty interrupt.
* - USART_IT_IDLE: Idle line detection interrupt.
* - USART_IT_ORE: OverRun Error interrupt.
* - USART_IT_NE: Noise Error interrupt.
* - USART_IT_FE: Framing Error interrupt.
* - USART_IT_PE: Parity Error interrupt.
*
* Note: - For IDLE, ORE, NE, FE and PE pending bits user has to
* read the USART DR register after calling this function.
* - TXE pending bit can't be cleared by this function, it's
* cleared only by a write to the USART DR register.
* Output : None
* Return : None
*******************************************************************************/
void USART_ClearITPendingBit(USART_TypeDef* USARTx, u16 USART_IT)
{
u16 bitpos = 0x00, itmask = 0x00;
/* Check the parameters */
assert_param(IS_USART_ALL_PERIPH(USARTx));
assert_param(IS_USART_CLEAR_IT(USART_IT));
assert_param(IS_USART_PERIPH_IT(USARTx, USART_IT)); /* The CTS interrupt is not available for UART4 and UART5 */
bitpos = USART_IT >> 0x08;
itmask = (u16)((u16)0x01 << bitpos);
USARTx->SR = (u16)~itmask;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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悬赏问答
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5Hi3516CV610 如何使用SD卡升级固件
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5cat /dev/logmpp 报错 <3>[ vi] [func]:vi_send_frame_node [line]:99 [info]:vi pic queue is full!
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5FPGA通过Bt1120传YUV422数据过来,vi接收不到数据——3516dv500
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50SS928 运行PQtools 拼接 推到设备里有一半画面会异常
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53536AV100的sample_vdec输出到CVBS显示
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10海思板子mpp怎么在vi阶段改变视频数据尺寸
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10HI3559AV100 多摄像头同步模式
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9海思ss928单路摄像头vio中加入opencv处理并显示
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10EB-RV1126-BC-191板子运行自己编码的程序
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