【海思开源篇】-（3）i2c-tools_专栏

【海思开源篇】-（3）i2c-tools

1 源码下载

https://mirrors.edge.kernel.org/pub/software/utils/i2c-tools/

下载版本为i2c-tools-4.1.tar.gz

根文件系统中已经通过busybox生成了i2c-tools，赞！！！

2 编译

make clean;make CC=arm-himix400-linux-gcc
拷贝i2cdetect i2cdump i2cget i2cset i2ctransfer

3 工具使用

3.1 i2cdetect

~ # i2cdetect -l
i2c-1   i2c             hibvt-i2c                               I2C adapter
i2c-0   i2c             hibvt-i2c                               I2C adapter
/home # i2cdetect 
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.

Usage: i2cdetect -l | -F I2CBUS | [-ya] [-q|-r] I2CBUS [FIRST LAST]

Detect I2C chips

        -l      List installed buses
        -F BUS# List functionalities on this bus
        -y      Disable interactive mode
        -a      Force scanning of non-regular addresses
        -q      Use smbus quick write commands for probing (default)
        -r      Use smbus read byte commands for probing
        FIRST and LAST limit probing range

~ # i2cdetect -r -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: 30 31 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --
i2c0上挂载两颗，由此推出i2c 地址分别为0x60,0x62（左移一位）

/home # i2cdetect -r -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                                                

从而可知i2c1上挂载有三个设备0x68

3.2 i2cdump

/home # i2cdump
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.

Usage: i2cdump [-fy] [-r FIRST-LAST] BUS ADDR [MODE]

Examine I2C registers

        I2CBUS  I2C bus number
        ADDRESS 0x03-0x77
MODE is:
        b       Byte (default)
        w       Word
        W       Word on even register addresses
        i       I2C block
        s       SMBus block
        c       Consecutive byte
        Append p for SMBus PEC

        -f      Force access
        -y      Disable interactive mode
        -r      Limit the number of registers being accessed

/home # i2cdump  -f -y 1 0x68
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: d1 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ?!..............
10: 00 00 00 00 00 00 00 00 5f f8 dc 10 00 00 00 00    ........_???....
20: 00 80 00 00 80 00 00 00 00 00 00 00 00 00 00 00    .?..?...........
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
40: 28 03 28 00 0b 88 80 10 00 00 00 20 80 42 4c 00    (?(.????... ?BL.
50: 00 00 00 00 00 00 00 00 00 00 07 30 81 0b c0 00    ..........?0???.
60: 14 14 24 04 0a 18 48 08 11 00 00 00 00 00 00 00    ??$???H??.......
70: 00 00 00 00 4c a1 14 00 00 00 15 03 00 00 00 00    ....L??...??....
80: d1 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ?!..............
90: 00 00 00 00 00 00 00 00 8d 02 dd 10 00 00 00 00    ........????....
a0: 00 80 00 00 80 00 00 00 00 00 00 00 00 00 00 00    .?..?...........
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
c0: 28 03 28 00 0b 88 80 10 00 00 00 20 80 42 4c 00    (?(.????... ?BL.
d0: 00 00 00 00 00 00 00 00 00 00 07 30 81 0b c0 00    ..........?0???.
e0: 14 14 24 04 0a 18 48 08 11 00 00 00 00 00 00 00    ??$???H??.......
f0: 00 00 00 00 4c a1 14 00 00 00 15 03 00 00 00 00    ....L??...??....

3.3 i2cset

/home # i2cset 
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.

Usage: i2cset [-fy] [-m MASK] BUS CHIP-ADDRESS DATA-ADDRESS [VALUE] ... [MODE]

Set I2C registers

        I2CBUS  I2C bus number
        ADDRESS 0x03-0x77
MODE is:
        c       Byte, no value
        b       Byte data (default)
        w       Word data
        i       I2C block data
        s       SMBus block data
        Append p for SMBus PEC

        -f      Force access
        -y      Disable interactive mode
        -r      Read back and compare the result
        -m MASK Mask specifying which bits to write

/home # i2cset -f -y 1 0x68 0x7a 0x15

3.4 i2cget

/home # i2cget
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.

Usage: i2cget [-fy] BUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]

Read from I2C/SMBus chip registers

        I2CBUS  I2C bus number
        ADDRESS 0x03-0x77
MODE is:
        b       Read byte data (default)
        w       Read word data
        c       Write byte/read byte
        Append p for SMBus PEC

        -f      Force access
        -y      Disable interactive mo