Fpdlink显示串行解串接口941 GPIO3与948 GPIO3连接问题

1. 前言

使用一个941连接2个 948显示输出:

941的GPIO0/1/2/3到前948的GPIO0/1/2/3和
941的D_GPIO0/1/2/3到第二个948的GPIO0/1/2/3。

941的D_GPIO3可以改变第二948的GPIO3
但有一个问题:
941的GPIO3不能改变第一个948的GPIO3

[    1.128404] Semidrive DS941 DS948 Goodix-TS 5-005d: I2C Address: 0x5d
[    1.137620] Semidrive DS941 DS948 Goodix-TS 5-005d: GPIO lookup for consumer irq
[    1.137628] Semidrive DS941 DS948 Goodix-TS 5-005d: using device tree for GPIO lookup
[    1.137711] of_get_named_gpiod_flags: parsed 'irq-gpios' property of node '/soc/i2c@30b70000/touch@5d[0]' - status (0)
[    1.137729] Semidrive DS941 DS948 Goodix-TS 5-005d: GPIO lookup for consumer reset
[    1.137737] Semidrive DS941 DS948 Goodix-TS 5-005d: using device tree for GPIO lookup
[    1.137761] of_get_named_gpiod_flags: parsed 'reset-gpios' property of node '/soc/i2c@30b70000/touch@5d[0]' - status (0)
[    1.138075] Semidrive DS941 DS948 Goodix-TS 5-005d: goodix_ts_probe(): get_gpio error=0 
[    1.146280] Semidrive DS941 DS948 Goodix-TS 5-005d: ts->addr_ds941=0xc, ts->addr_ds948=0x2c
[    1.154669] Semidrive DS941 DS948 Goodix-TS 5-005d: ts->irq_channel=3, ts->reset_channel=2
[    1.163147] Semidrive DS941 DS948 Goodix-TS 5-005d: 941[4] reg=0x1e, val=0x1
[    1.171158] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 reg=0x17, val=0x9e
[    1.178249] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 reg=0x7, val=0xba
[    1.185233] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 reg=0x8, val=0xba
[    1.192240] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 reg=0x70, val=0x28
[    1.199309] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 reg=0x77, val=0x28
[    1.206796] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 before out reg=0xf, val=0x0
[    1.214776] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 after out reg=0xf, val=0x3
[    1.222567] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 before out reg=0x1f, val=0x0
[    1.230679] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 after out reg=0x1f, val=0x5
[    1.258151] Semidrive DS941 DS948 Goodix-TS 5-005d: goodix_ts_probe(): call reset
[    1.265847] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 before reg=0x1e, val=0x0
[    1.273605] usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
[    1.273969] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 after reg=0x1e, val=0x10
[    1.292078] usb 2-1: no of_node; not parsing pinctrl DT
[    1.295916] hub 2-1:1.0: no of_node; not parsing pinctrl DT
[    1.295990] hub 2-1:1.0: USB hub found
[    1.296245] hub 2-1:1.0: 4 ports detected
[    1.366154] Semidrive DS941 DS948 Goodix-TS 5-005d: ts->client->addr == 0x14  0
[    1.373695] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 before reg=0x1f, val=0x5
[    1.381463] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 after reg=0x1f, val=0x1
[    1.390844] Semidrive DS941 DS948 Goodix-TS 5-005d: goodix_reset(): reset high
[    1.399613] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 before reg=0x1e, val=0x10
[    1.407469] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 after reg=0x1e, val=0x90
[    1.418164] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[    1.482306] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 in reg=0xf, val=0x3
[    1.489794] Semidrive DS941 DS948 Goodix-TS 5-005d: 948 in reg=0x1f, val=0x1
[    1.554964] Semidrive DS941 DS948 Goodix-TS 5-005d: goodix_i2c_test(): read error=0, test=0x5f
[    1.565179] Semidrive DS941 DS948 Goodix-TS 5-005d: Touch ID: 928, version: 0x1060
[    1.573749] usb 1-1: no of_node; not parsing pinctrl DT
[    1.574459] Semidrive DS941 DS948 Goodix-TS 5-005d: dump 941:
[    1.580574] Semidrive DS941 DS948 Goodix-TS 5-005d: Direct firmware load for goodix_928_cfg.bin failed with error -2
[    1.580620] goodix_configure_dev
[    1.599715] hub 1-1:1.0: no of_node; not parsing pinctrl DT
[    1.599763] hub 1-1:1.0: USB hub found
[    1.599960] hub 1-1:1.0: 4 ports detected
[    1.609712] Semidrive DS941 DS948 Goodix-TS 5-005d: goodix_read_config(): len=186, 0x5f, 0x0, 0x5, 0xe0, 0x1, 0x5, 0xd
[    1.610274] input: Goodix Capacitive TouchScreen as /devices/platform/soc/30b70000.i2c/i2c-5/5-005d/input/input0
[    1.610413] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 out reg=0x0, val=0x18
[    1.617755] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 out reg=0x1, val=0x0
[    1.624996] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 out reg=0x2, val=0x0
[    1.633780] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 out reg=0x3, val=0x9a
[    1.641132] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 out reg=0x4, val=0x0
[    1.648385] Semidrive DS941 DS948 Goodix-TS 5-005d: 941 out reg=0x5, val=0x0
........

外部信号到948的GPIO3正常，检查完毕;
但941的GPIO3没有信号

2. 修改寄存器

想要948的GPIO3作为输入，而941的GPIO3作为输出
尝试添加如下配置

Write( 941, 0x1E, 0x01)
Write( 941, 0x0F,0x01)
Write( 948_port0, 0x34, 0x01)
Write(948_port0, 0x1F,0x03)

仍然没有好
941的GPIO3一直很低。

touch_dump_all: dump ser-0xc:
ser: Reg 0x00 = 0x18.
ser: Reg 0x01 = 0x0.
ser: Reg 0x02 = 0x0.
ser: Reg 0x03 = 0x9a.
ser: Reg 0x04 = 0x0.
ser: Reg 0x05 = 0x0.
ser: Reg 0x06 = 0x58.
ser: Reg 0x07 = 0xba.
ser: Reg 0x08 = 0xba.
ser: Reg 0x09 = 0x1.
ser: Reg 0x0a = 0xd4.
ser: Reg 0x0b = 0x6.
ser: Reg 0x0c = 0x67.
ser: Reg 0x0d = 0x30.
ser: Reg 0x0e = 0x0.
ser: Reg 0x0f = 0x1.
ser: Reg 0x10 = 0x0.
ser: Reg 0x11 = 0x0.
ser: Reg 0x12 = 0x0.
ser: Reg 0x13 = 0x8f.
ser: Reg 0x14 = 0x0.
ser: Reg 0x15 = 0x0.
ser: Reg 0x16 = 0xfe.
ser: Reg 0x17 = 0x9e.
ser: Reg 0x18 = 0x7f.
ser: Reg 0x19 = 0x7f.
ser: Reg 0x1a = 0x1.
ser: Reg 0x1b = 0x0.
ser: Reg 0x1c = 0x0.
ser: Reg 0x1d = 0x0.
ser: Reg 0x1e = 0x1.
ser: Reg 0x1f = 0x0.
ser: Reg 0x20 = 0xb.
ser: Reg 0x21 = 0x0.
ser: Reg 0x22 = 0x25.
ser: Reg 0x23 = 0x0.
ser: Reg 0x24 = 0x0.
ser: Reg 0x25 = 0x0.
ser: Reg 0x26 = 0x0.
ser: Reg 0x27 = 0x0.
ser: Reg 0x28 = 0x1.
ser: Reg 0x29 = 0x20.
ser: Reg 0x2a = 0x20.
ser: Reg 0x2b = 0xa0.
ser: Reg 0x2c = 0x0.
ser: Reg 0x2d = 0x0.
ser: Reg 0x2e = 0xa5.
ser: Reg 0x2f = 0x5a.
ser: Reg 0x30 = 0x0.
ser: Reg 0x31 = 0xb9.
ser: Reg 0x32 = 0x0.
ser: Reg 0x33 = 0x5.
ser: Reg 0x34 = 0xc.
ser: Reg 0x35 = 0x0.
ser: Reg 0x36 = 0x0.
ser: Reg 0x37 = 0x0.
ser: Reg 0x38 = 0x0.
ser: Reg 0x39 = 0x0.
ser: Reg 0x3a = 0x0.
ser: Reg 0x3b = 0x0.
ser: Reg 0x3c = 0x0.
ser: Reg 0x3d = 0x0.
ser: Reg 0x3e = 0x81.
ser: Reg 0x3f = 0x2.
ser: Reg 0x40 = 0x8.
ser: Reg 0x41 = 0x5.
ser: Reg 0x42 = 0x14.
ser: Reg 0x43 = 0x0.
ser: Reg 0x44 = 0x0.
ser: Reg 0x45 = 0x0.
ser: Reg 0x46 = 0x0.
ser: Reg 0x47 = 0x0.
ser: Reg 0x48 = 0x0.
ser: Reg 0x49 = 0x0.
ser: Reg 0x4a = 0x0.
ser: Reg 0x4b = 0x0.
ser: Reg 0x4c = 0x0.
ser: Reg 0x4d = 0x0.
ser: Reg 0x4e = 0x0.
ser: Reg 0x4f = 0x8c.
ser: Reg 0x50 = 0x16.
ser: Reg 0x51 = 0x0.
ser: Reg 0x52 = 0x0.
ser: Reg 0x53 = 0x0.
ser: Reg 0x54 = 0x2.
ser: Reg 0x55 = 0x10.
ser: Reg 0x56 = 0x0.
ser: Reg 0x57 = 0x2.
ser: Reg 0x58 = 0x0.
ser: Reg 0x59 = 0x0.
ser: Reg 0x5a = 0xd9.
ser: Reg 0x5b = 0x5.
ser: Reg 0x5c = 0x7.
ser: Reg 0x5d = 0x6.
ser: Reg 0x5e = 0x44.
ser: Reg 0x5f = 0x67.
ser: Reg 0x60 = 0x22.
ser: Reg 0x61 = 0x2.
ser: Reg 0x62 = 0x0.
ser: Reg 0x63 = 0x0.
ser: Reg 0x64 = 0x10.
ser: Reg 0x65 = 0x0.
ser: Reg 0x66 = 0x0.
ser: Reg 0x67 = 0x0.
ser: Reg 0x68 = 0x0.
ser: Reg 0x69 = 0x0.
ser: Reg 0x6a = 0x0.
ser: Reg 0x6b = 0x0.
ser: Reg 0x6c = 0x0.
ser: Reg 0x6d = 0x0.
ser: Reg 0x6e = 0x20.
ser: Reg 0x6f = 0x0.

touch_dump_all: dump des-0x2c:
des: Reg 0x00 = 0x58.
des: Reg 0x01 = 0x4.
des: Reg 0x02 = 0x0.
des: Reg 0x03 = 0xf0.
des: Reg 0x04 = 0xfe.
des: Reg 0x05 = 0x1e.
des: Reg 0x06 = 0x0.
des: Reg 0x07 = 0x18.
des: Reg 0x08 = 0x0.
des: Reg 0x09 = 0x0.
des: Reg 0x0a = 0x0.
des: Reg 0x0b = 0x0.
des: Reg 0x0c = 0x0.
des: Reg 0x0d = 0x0.
des: Reg 0x0e = 0x0.
des: Reg 0x0f = 0x0.
des: Reg 0x10 = 0x0.
des: Reg 0x11 = 0x0.
des: Reg 0x12 = 0x0.
des: Reg 0x13 = 0x0.
des: Reg 0x14 = 0x0.
des: Reg 0x15 = 0x0.
des: Reg 0x16 = 0x0.
des: Reg 0x17 = 0x0.
des: Reg 0x18 = 0x0.
des: Reg 0x19 = 0x1.
des: Reg 0x1a = 0x0.
des: Reg 0x1b = 0x0.
des: Reg 0x1c = 0x23.
des: Reg 0x1d = 0x10.
des: Reg 0x1e = 0x90.
des: Reg 0x1f = 0x3.
des: Reg 0x20 = 0x0.
des: Reg 0x21 = 0x0.
des: Reg 0x22 = 0x40.
des: Reg 0x23 = 0x20.
des: Reg 0x24 = 0x8.
des: Reg 0x25 = 0x0.
des: Reg 0x26 = 0x83.
des: Reg 0x27 = 0x84.
des: Reg 0x28 = 0x1.
des: Reg 0x29 = 0x0.
des: Reg 0x2a = 0x0.
des: Reg 0x2b = 0x0.
des: Reg 0x2c = 0x0.
des: Reg 0x2d = 0x0.
des: Reg 0x2e = 0x0.
des: Reg 0x2f = 0x0.
des: Reg 0x30 = 0x0.
des: Reg 0x31 = 0x0.
des: Reg 0x32 = 0x90.
des: Reg 0x33 = 0x25.
des: Reg 0x34 = 0x1.
des: Reg 0x35 = 0x0.
des: Reg 0x36 = 0x0.
des: Reg 0x37 = 0x8c.
des: Reg 0x38 = 0x0.
des: Reg 0x39 = 0x0.
des: Reg 0x3a = 0x0.
des: Reg 0x3b = 0x0.
des: Reg 0x3c = 0x20.
des: Reg 0x3d = 0xe0.
des: Reg 0x3e = 0x23.
des: Reg 0x3f = 0x0.
des: Reg 0x40 = 0x43.
des: Reg 0x41 = 0x3.
des: Reg 0x42 = 0x3.
des: Reg 0x43 = 0x0.
des: Reg 0x44 = 0x60.
des: Reg 0x45 = 0x88.
des: Reg 0x46 = 0x0.
des: Reg 0x47 = 0x0.
des: Reg 0x48 = 0xf.
des: Reg 0x49 = 0xe0.
des: Reg 0x4a = 0x0.
des: Reg 0x4b = 0x8.
des: Reg 0x4c = 0x0.
des: Reg 0x4d = 0x0.
des: Reg 0x4e = 0x63.
des: Reg 0x4f = 0x0.
des: Reg 0x50 = 0x3.
des: Reg 0x51 = 0x10.
des: Reg 0x52 = 0x0.
des: Reg 0x53 = 0x1.
des: Reg 0x54 = 0x80.
des: Reg 0x55 = 0x0.
des: Reg 0x56 = 0x0.
des: Reg 0x57 = 0x0.
des: Reg 0x58 = 0x0.
des: Reg 0x59 = 0x3f.
des: Reg 0x5a = 0x20.
des: Reg 0x5b = 0x20.
des: Reg 0x5c = 0x0.
des: Reg 0x5d = 0x0.
des: Reg 0x5e = 0x0.
des: Reg 0x5f = 0x0.
des: Reg 0x60 = 0x0.
des: Reg 0x61 = 0x0.
des: Reg 0x62 = 0x0.
des: Reg 0x63 = 0x0.
des: Reg 0x64 = 0x10.
des: Reg 0x65 = 0x0.
des: Reg 0x66 = 0x0.
des: Reg 0x67 = 0x0.
des: Reg 0x68 = 0x0.
des: Reg 0x69 = 0x0.
des: Reg 0x6a = 0x0.
des: Reg 0x6b = 0x0.
des: Reg 0x6c = 0x0.
des: Reg 0x6d = 0x0.
des: Reg 0x6e = 0x0.
des: Reg 0x6f = 0x0.

3.对948的GPIO3施加电压时，查看0x6E中GPIO状态的变化

948的reg默认值0x6E为0x0, 941的GPIO3为低
在切换948的GPIO3到高之后，这个值变为0x8，但是941的GPIO3仍然是低的

可以尝试通过在941AS上写入0x20来注册0x04
然后写入0x00来注册0x04

从而重新设置SER上的回传通道CRC错误
然后捕获一个寄存器转储

4. 修改0x0e

试着把寄存器0x0e改成0x01
设置ser 0x4为0x20，然后0x0

touch_dump_all: dump ser-0xc:
ser: Reg 0x00 = 0x18.
ser: Reg 0x01 = 0x0.
ser: Reg 0x02 = 0x0.
ser: Reg 0x03 = 0x9a.
ser: Reg 0x04 = 0x0.
ser: Reg 0x05 = 0x0.
ser: Reg 0x06 = 0x58.
ser: Reg 0x07 = 0xba.
ser: Reg 0x08 = 0xba.
ser: Reg 0x09 = 0x1.
ser: Reg 0x0a = 0x0.
ser: Reg 0x0b = 0x0.
ser: Reg 0x0c = 0x65.
ser: Reg 0x0d = 0x30.
ser: Reg 0x0e = 0x0.
ser: Reg 0x0f = 0x5.
ser: Reg 0x10 = 0x0.
ser: Reg 0x11 = 0x0.
ser: Reg 0x12 = 0x0.
ser: Reg 0x13 = 0x8f.
ser: Reg 0x14 = 0x0.
ser: Reg 0x15 = 0x0.
ser: Reg 0x16 = 0xfe.
ser: Reg 0x17 = 0x1e.
ser: Reg 0x18 = 0x7f.
ser: Reg 0x19 = 0x7f.
ser: Reg 0x1a = 0x1.
ser: Reg 0x1b = 0x0.
ser: Reg 0x1c = 0x0.
ser: Reg 0x1d = 0x0.
ser: Reg 0x1e = 0x1.
ser: Reg 0x1f = 0x0.
ser: Reg 0x20 = 0xb.
ser: Reg 0x21 = 0x0.
ser: Reg 0x22 = 0x25.
ser: Reg 0x23 = 0x0.
ser: Reg 0x24 = 0x0.
ser: Reg 0x25 = 0x0.
ser: Reg 0x26 = 0x0.
ser: Reg 0x27 = 0x0.
ser: Reg 0x28 = 0x1.
ser: Reg 0x29 = 0x20.
ser: Reg 0x2a = 0x20.
ser: Reg 0x2b = 0xa0.
ser: Reg 0x2c = 0x0.
ser: Reg 0x2d = 0x0.
ser: Reg 0x2e = 0xa5.
ser: Reg 0x2f = 0x5a.
ser: Reg 0x30 = 0x0.
ser: Reg 0x31 = 0xb9.
ser: Reg 0x32 = 0x0.
ser: Reg 0x33 = 0x5.
ser: Reg 0x34 = 0xc.
ser: Reg 0x35 = 0x0.
ser: Reg 0x36 = 0x0.
ser: Reg 0x37 = 0x0.
ser: Reg 0x38 = 0x0.
ser: Reg 0x39 = 0x0.
ser: Reg 0x3a = 0x0.
ser: Reg 0x3b = 0x0.
ser: Reg 0x3c = 0x0.
ser: Reg 0x3d = 0x0.
ser: Reg 0x3e = 0x81.
ser: Reg 0x3f = 0x2.
ser: Reg 0x40 = 0x8.
ser: Reg 0x41 = 0x5.
ser: Reg 0x42 = 0x14.
ser: Reg 0x43 = 0x0.
ser: Reg 0x44 = 0x0.
ser: Reg 0x45 = 0x0.
ser: Reg 0x46 = 0x0.
ser: Reg 0x47 = 0x0.
ser: Reg 0x48 = 0x0.
ser: Reg 0x49 = 0x0.
ser: Reg 0x4a = 0x0.
ser: Reg 0x4b = 0x0.
ser: Reg 0x4c = 0x0.
ser: Reg 0x4d = 0x0.
ser: Reg 0x4e = 0x0.
ser: Reg 0x4f = 0x8c.
ser: Reg 0x50 = 0x16.
ser: Reg 0x51 = 0x0.
ser: Reg 0x52 = 0x0.
ser: Reg 0x53 = 0x0.
ser: Reg 0x54 = 0x2.
ser: Reg 0x55 = 0x10.
ser: Reg 0x56 = 0x0.
ser: Reg 0x57 = 0x2.
ser: Reg 0x58 = 0x0.
ser: Reg 0x59 = 0x0.
ser: Reg 0x5a = 0xd9.
ser: Reg 0x5b = 0x5.
ser: Reg 0x5c = 0x7.
ser: Reg 0x5d = 0x6.
ser: Reg 0x5e = 0x44.
ser: Reg 0x5f = 0x67.
ser: Reg 0x60 = 0x22.
ser: Reg 0x61 = 0x2.
ser: Reg 0x62 = 0x0.
ser: Reg 0x63 = 0x0.
ser: Reg 0x64 = 0x10.
ser: Reg 0x65 = 0x0.
ser: Reg 0x66 = 0x0.
ser: Reg 0x67 = 0x0.
ser: Reg 0x68 = 0x0.
ser: Reg 0x69 = 0x0.
ser: Reg 0x6a = 0x0.
ser: Reg 0x6b = 0x0.
ser: Reg 0x6c = 0x0.
ser: Reg 0x6d = 0x0.
ser: Reg 0x6e = 0x20.
ser: Reg 0x6f = 0x0.

设置ser 0x1为0xe仍然不工作。

5. 调整0x01

试着把0x01写到0x0F而不是0x0e。
另外，为什么948的寄存器在第二个寄存器转储上都是0x00 ?

仍然没有好的。

我认为设置reg_0x1为0xf后，slaveid的reg 0x7是0x0，所以不能得到948的reg。

6. 四种实验结果如下

(1) des 948的GPIO3是高的，而941的GPIO3是低的;

(2) 将reg0x4设为0x20，然后设为0x0, 941的GPIO3仍然较低;

(3)设置reg0xf为0x1,941的GPIO3仍然低，

(4) 设置reg0xf为0x9, 941的GPIO3仍然低，

7. FAE+测试板 测试结果

FAE使用测试板，尝试了这个配置，工作ok:
941AS port 0 -> 948
941 reg 0x0F = 0x05
948 reg 0x1F = 0x03

当用伏特计探测时，我可以清楚地看到948侧的切换GPIO3在941AS侧正确地输出
使用此配置的941AS侧的0x1C中没有显示GPIO状态

是通过检查0x1C寄存器来检查这个，还是通过实际查看GPIO3引脚电压来检查这个?
如果正在查看0x1C寄存器，当用作远程BC GPIO时，它将不会显示GPIO切换

8.梳理问题

设置远程GPIO3为高，但检查941 GPIO3引脚低
确认如下问题：

1. 在这种状态下，转储的寄存器配置是否正确?
2. 可以通过0x6e检查948的gpio状态，但是941的reg 0x1c用于什么?

当941AS GPIO配置为输入时，使用941AS侧的0x1C
在这种情况下，941AS GPIO是一个输出，因此0x1C不会报告状态
然而，与上述配置，能够看到适当的引脚状态时，探针与万用表

我认为设置值和转储寄存器值都是好的
但是948的GPIO3是高的，然后941的GPIO3是低的，通过万用表和示波器检查

可以通过写入0x09到0x0F，然后测量GPIO3来检查GPIO是否烧坏
这将把输出设置为高