V851S I2C/TWI 损坏（xfer 错误)

kanken6174 LV 6

大家好，
我的 V851S (tina-linux) 上的 i2c/twi 总线似乎有问题，每次我尝试使用 i2cdump 或 i2cDetect 等 shell i2C 实用程序时，我都会收到以下错误（i2cget 和 i2cwrite 也会发生这种情况）：

root@TinaLinux:/sys/devices/platform/soc/pio/gpiochip0/gpio/gpio8# i2cdetect 1
[  786.358195] i2c i2c-1: ioctl, cmd=0x705, arg=0xbea72c6c
i2cdetect: WARNING! This program can confuse your I2C bus
Continue? [y/N] y
     0  1  2  3  4  5  6  7  8  [  789.513384] i2c i2c-1: ioctl, cmd=0x703, arg=0x03
9  a  b  c  d  e  f
00:        [  789.521510] i2c i2c-1: ioctl, cmd=0x720, arg=0xbea72c4c
  [  789.530134] i2c i2c-1: master_xfer[0] W, addr=0x03, len=0
[  789.536525] twi_start()508 - [i2c1] START can't sendout!
[  789.542553] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
[  789.549191] twi_start()508 - [i2c1] START can't sendout!
[  789.555137] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
[  789.561763] twi_start()508 - [i2c1] START can't sendout!
[  789.567722] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
-- [  789.574219] i2c i2c-1: ioctl, cmd=0x703, arg=0x04
[  789.579759] i2c i2c-1: ioctl, cmd=0x720, arg=0xbea72c4c
[  789.585615] i2c i2c-1: master_xfer[0] W, addr=0x04, len=0
[  789.591919] twi_start()508 - [i2c1] START can't sendout!
[  789.597882] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
[  789.604494] twi_start()508 - [i2c1] START can't sendout!
[  789.610452] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
[  789.617068] twi_start()508 - [i2c1] START can't sendout!
[  789.623016] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
-- [  789.629512] i2c i2c-1: ioctl, cmd=0x703, arg=0x05
[  789.635030] i2c i2c-1: ioctl, cmd=0x720, arg=0xbea72c4c
[  789.640964] i2c i2c-1: master_xfer[0] W, addr=0x05, len=0
[  789.647206] twi_start()508 - [i2c1] START can't sendout!
[  789.653155] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
[  789.659783] twi_start()508 - [i2c1] START can't sendout!
[  789.665728] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:
[  789.672352] twi_start()508 - [i2c1] START can't sendout!
[  789.678309] sunxi_i2c_do_xfer()1951 - [i2c1] twi_regulator:

这是我的 I2C 内核配置：
Screenshot from 2023-11-11 15-46-24.png

和我的 i2c“menuconfig”：

我知道至少已经有一篇关于此问题的帖子，但这只是一条警告消息，在我的情况下，它无法正常工作，因为我在 I2C 1 的地址 0x36 上有一个未检测到的设备。

我怎样才能摆脱这些错误？

我的 twi DTS 配置如下：

twi0_pins_a: twi0@0 {
		allwinner,pins = "PA16", "PA17";
		allwinner,pname = "twi0_scl", "twi0_sda";
		allwinner,function = "twi0";
		allwinner,muxsel = <4>;
		allwinner,drive = <0>;
		allwinner,pull = <1>;
	};

	twi0_pins_b: twi0@1 {
		allwinner,pins = "PA16", "PA17";
		allwinner,function = "io_disabled";
		allwinner,muxsel = <0xf>;
		allwinner,drive = <0>;
		allwinner,pull = <0>;
	};

	twi1_pins_a: twi1@0 {
		allwinner,pins = "PA6", "PA7";
		allwinner,pname = "twi1_scl", "twi1_sda";
		allwinner,function = "twi1";
		allwinner,muxsel = <4>;
		allwinner,drive = <0>;
		allwinner,pull = <1>;
	};

	twi1_pins_b: twi1@1 {
		allwinner,pins = "PA6", "PA7";
		allwinner,function = "io_disabled";
		allwinner,muxsel = <0xf>;
		allwinner,drive = <0>;
		allwinner,pull = <0>;
	};

	twi2_pins_a: twi2@0 {
		allwinner,pins = "PH11", "PH12";
		allwinner,pname = "twi2_scl", "twi2_sda";
		allwinner,function = "twi2";
		allwinner,muxsel = <5>;
		allwinner,drive = <0>;
		allwinner,pull = <1>;
	};

	twi2_pins_b: twi2@1 {
		allwinner,pins = "PH11", "PH12";
		allwinner,function = "io_disabled";
		allwinner,muxsel = <0xf>;
		allwinner,drive = <0>;
		allwinner,pull = <0>;
	};

	twi3_pins_a: twi3@0 {
		allwinner,pins = "PI3", "PI4";
		allwinner,pname = "twi3_scl", "twi3_sda";
		allwinner,function = "twi6";
		allwinner,muxsel = <6>;
		allwinner,drive = <0>;
		allwinner,pull = <1>;
	};

	twi3_pins_b: twi3@1 {
		allwinner,pins = "PI3", "PI4";
		allwinner,function = "io_disabled";//io_disabled
		allwinner,muxsel = <0xf>;
		allwinner,drive = <0>;
		allwinner,pull = <0>;
	};

	twi4_pins_a: twi4@0 {
		allwinner,pins = "PI1", "PI2";
		allwinner,pname = "twi4_scl", "twi4_sda";
		allwinner,function = "twi4";
		allwinner,muxsel = <5>;
		allwinner,drive = <0>;
		allwinner,pull = <1>;
	};

	twi4_pins_b: twi4@1 {
		allwinner,pins = "PI1", "PI2";
		allwinner,function = "io_disabled";
		allwinner,muxsel = <0xf>;
		allwinner,drive = <0>;
		allwinner,pull = <0>;
	};

柚木鉉 LV 9

twi的配置是怎样的

kanken6174 LV 6

我似乎忘记了i2c上拉电阻（每个人都会遇到哈哈），现在调节器问题消失了，但通信似乎仍然失败：

[  102.176976] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.184713] i2c i2c-1: master_xfer[0] W, addr=0x60, len=0
[  102.190934] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x60) (sunxi_i2c_do_xfer)
[  102.202379] i2c i2c-1: ioctl, cmd=0x703, arg=0x61
[  102.207685] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.213540] i2c i2c-1: master_xfer[0] W, addr=0x61, len=0
[  102.219770] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x61) (sunxi_i2c_do_xfer)
[  102.231144] i2c i2c-1: ioctl, cmd=0x703, arg=0x62
[  102.236440] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.242295] i2c i2c-1: master_xfer[0] W, addr=0x62, len=0
[  102.248581] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x62) (sunxi_i2c_do_xfer)
[  102.259960] i2c i2c-1: ioctl, cmd=0x703, arg=0x63
[  102.265237] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.271113] i2c i2c-1: master_xfer[0] W, addr=0x63, len=0
[  102.277333] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x63) (sunxi_i2c_do_xfer)
[  102.288706] i2c i2c-1: ioctl, cmd=0x703, arg=0x64
[  102.293981] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.299908] i2c i2c-1: master_xfer[0] W, addr=0x64, len=0
[  102.306117] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x64) (sunxi_i2c_do_xfer)
[  102.317489] i2c i2c-1: ioctl, cmd=0x703, arg=0x65
[  102.322766] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.328642] i2c i2c-1: master_xfer[0] W, addr=0x65, len=0
[  102.334848] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x65) (sunxi_i2c_do_xfer)
[  102.346263] i2c i2c-1: ioctl, cmd=0x703, arg=0x66
[  102.351544] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.357425] i2c i2c-1: master_xfer[0] W, addr=0x66, len=0
[  102.363631] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x66) (sunxi_i2c_do_xfer)
[  102.374999] i2c i2c-1: ioctl, cmd=0x703, arg=0x67
[  102.380296] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.386161] i2c i2c-1: master_xfer[0] W, addr=0x67, len=0
[  102.392361] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x67) (sunxi_i2c_do_xfer)
[  102.403786] i2c i2c-1: ioctl, cmd=0x703, arg=0x68
[  102.409092] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.414946] i2c i2c-1: master_xfer[0] W, addr=0x68, len=0
[  102.421170] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x68) (sunxi_i2c_do_xfer)
[  102.432538] i2c i2c-1: ioctl, cmd=0x703, arg=0x69
[  102.437837] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.443692] i2c i2c-1: master_xfer[0] W, addr=0x69, len=0
[  102.449969] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x69) (sunxi_i2c_do_xfer)
[  102.461344] i2c i2c-1: ioctl, cmd=0x703, arg=0x6a
[  102.466640] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.472498] i2c i2c-1: master_xfer[0] W, addr=0x6a, len=0
[  102.478726] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x6a) (sunxi_i2c_do_xfer)
[  102.490089] i2c i2c-1: ioctl, cmd=0x703, arg=0x6b
[  102.495363] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.501290] i2c i2c-1: master_xfer[0] W, addr=0x6b, len=0
[  102.507517] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x6b) (sunxi_i2c_do_xfer)
[  102.518889] i2c i2c-1: ioctl, cmd=0x703, arg=0x6c
[  102.524165] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.530041] i2c i2c-1: master_xfer[0] W, addr=0x6c, len=0
[  102.536259] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x6c) (sunxi_i2c_do_xfer)
[  102.547670] i2c i2c-1: ioctl, cmd=0x703, arg=0x6d
[  102.552946] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.558825] i2c i2c-1: master_xfer[0] W, addr=0x6d, len=0
[  102.565029] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x6d) (sunxi_i2c_do_xfer)
[  102.576442] i2c i2c-1: ioctl, cmd=0x703, arg=0x6e
[  102.581722] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.587602] i2c i2c-1: master_xfer[0] W, addr=0x6e, len=0
[  102.593808] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x6e) (sunxi_i2c_do_xfer)
[  102.605227] i2c i2c-1: ioctl, cmd=0x703, arg=0x6f
[  102.610530] i2c i2c-1: ioctl, cmd=0x720, arg=0xbeef1c7c
[  102.616399] i2c i2c-1: master_xfer[0] W, addr=0x6f, len=0
[  102.622606] sunxi_i2c_do_xfer()1974 - [i2c1] incomplete xfer (status: 0x20, dev addr: 0x6f) (sunxi_i2c_do_xfer)
60: -- -- -- -- -- -- -- -- -- -[  102.634085] i2c i2c-1: ioctl, cmd=0x703, arg=0x70
- -- -- -- -- -- --

0x6C 处应该有一个有效的设备。从我的示波器中，我清楚地看到该设备正在接收 SCL 和 SDA 信号，但没有读回任何内容......

kanken6174 LV 6

事实证明我缺少这些线路的上拉电阻。现在它们不再出现“调节器”错误，而是所有地址都超时。我现在有一个 MPU6050 连接到总线进行测试，这是扫描日志，您可以看到它什么也没发现。 mpu6050的地址应该是0x68或0x69，两者都很清楚：

root@TinaLinux:/# i2cdetect 1 -y
[   26.316647] i2c i2c-1: ioctl, cmd=0x705, arg=0xbebcac8c
     0  1  2  3  4  5  6  7  8  [   26.322650] i2c i2c-1: ioctl, cmd=0x703, arg=0x03
9  a  b  c  d  e  f
00:        [   26.330781] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
  [   26.339311] i2c i2c-1: master_xfer[0] W, addr=0x03, len=0
[   31.366572] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x3)
-- [   31.374170] i2c i2c-1: ioctl, cmd=0x703, arg=0x04
[   31.379777] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[   31.385639] i2c i2c-1: master_xfer[0] W, addr=0x04, len=0

... // 为简洁起见而删减

60: [  495.059785] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  495.066137] i2c i2c-1: master_xfer[0] W, addr=0x60, len=0
[  500.086565] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x60)
-- [  500.094231] i2c i2c-1: ioctl, cmd=0x703, arg=0x61
[  500.099774] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  500.105629] i2c i2c-1: master_xfer[0] W, addr=0x61, len=0
[  505.126562] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x61)
-- [  505.134222] i2c i2c-1: ioctl, cmd=0x703, arg=0x62
[  505.139767] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  505.145622] i2c i2c-1: master_xfer[0] W, addr=0x62, len=0
[  510.166586] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x62)
-- [  510.174251] i2c i2c-1: ioctl, cmd=0x703, arg=0x63
[  510.179792] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  510.185648] i2c i2c-1: master_xfer[0] W, addr=0x63, len=0
[  515.206563] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x63)
-- [  515.214226] i2c i2c-1: ioctl, cmd=0x703, arg=0x64
[  515.219819] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  515.225678] i2c i2c-1: master_xfer[0] W, addr=0x64, len=0
[  520.246561] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x64)
-- [  520.254226] i2c i2c-1: ioctl, cmd=0x703, arg=0x65
[  520.259765] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  520.265622] i2c i2c-1: master_xfer[0] W, addr=0x65, len=0
[  525.286562] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x65)
-- [  525.294226] i2c i2c-1: ioctl, cmd=0x703, arg=0x66
[  525.299767] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  525.305622] i2c i2c-1: master_xfer[0] W, addr=0x66, len=0
[  530.326561] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x66)
-- [  530.334223] i2c i2c-1: ioctl, cmd=0x703, arg=0x67
[  530.339766] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  530.345623] i2c i2c-1: master_xfer[0] W, addr=0x67, len=0
[  535.366587] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x67)
-- [  535.374251] i2c i2c-1: ioctl, cmd=0x703, arg=0x68
[  535.379799] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  535.385655] i2c i2c-1: master_xfer[0] W, addr=0x68, len=0
[  540.406582] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x68)
-- [  540.414247] i2c i2c-1: ioctl, cmd=0x703, arg=0x69
[  540.419837] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  540.425696] i2c i2c-1: master_xfer[0] W, addr=0x69, len=0
[  545.446563] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x69)
-- [  545.454231] i2c i2c-1: ioctl, cmd=0x703, arg=0x6a
[  545.459774] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  545.465630] i2c i2c-1: master_xfer[0] W, addr=0x6a, len=0
[  550.486562] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x6a)
-- [  550.494228] i2c i2c-1: ioctl, cmd=0x703, arg=0x6b
[  550.499769] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  550.505625] i2c i2c-1: master_xfer[0] W, addr=0x6b, len=0
[  555.526561] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x6b)
-- [  555.534225] i2c i2c-1: ioctl, cmd=0x703, arg=0x6c
[  555.539771] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  555.545628] i2c i2c-1: master_xfer[0] W, addr=0x6c, len=0
[  560.566588] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x6c)
-- [  560.574248] i2c i2c-1: ioctl, cmd=0x703, arg=0x6d
[  560.579791] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  560.585647] i2c i2c-1: master_xfer[0] W, addr=0x6d, len=0
[  565.606563] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x6d)
-- [  565.614225] i2c i2c-1: ioctl, cmd=0x703, arg=0x6e
[  565.619817] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  565.625675] i2c i2c-1: master_xfer[0] W, addr=0x6e, len=0
[  570.646562] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x6e)
-- [  570.654224] i2c i2c-1: ioctl, cmd=0x703, arg=0x6f
[  570.659766] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  570.665623] i2c i2c-1: master_xfer[0] W, addr=0x6f, len=0
[  575.686561] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x6f)
-- [  575.694255] i2c i2c-1: ioctl, cmd=0x703, arg=0x70

70: [  575.699777] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  575.706129] i2c i2c-1: master_xfer[0] W, addr=0x70, len=0
[  580.726587] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x70)
-- [  580.734251] i2c i2c-1: ioctl, cmd=0x703, arg=0x71
[  580.739800] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  580.745655] i2c i2c-1: master_xfer[0] W, addr=0x71, len=0
[  585.766565] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x71)
-- [  585.774229] i2c i2c-1: ioctl, cmd=0x703, arg=0x72
[  585.779823] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  585.785682] i2c i2c-1: master_xfer[0] W, addr=0x72, len=0
[  590.806562] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x72)
-- [  590.814226] i2c i2c-1: ioctl, cmd=0x703, arg=0x73
[  590.819771] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  590.825626] i2c i2c-1: master_xfer[0] W, addr=0x73, len=0
[  595.846562] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x73)
-- [  595.854226] i2c i2c-1: ioctl, cmd=0x703, arg=0x74
[  595.859773] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  595.865630] i2c i2c-1: master_xfer[0] W, addr=0x74, len=0
[  600.886561] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x74)
-- [  600.894216] i2c i2c-1: ioctl, cmd=0x703, arg=0x75
[  600.899762] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  600.905618] i2c i2c-1: master_xfer[0] W, addr=0x75, len=0
[  605.926601] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x75)
-- [  605.934261] i2c i2c-1: ioctl, cmd=0x703, arg=0x76
[  605.939803] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  605.945659] i2c i2c-1: master_xfer[0] W, addr=0x76, len=0
[  610.966564] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x76)
-- [  610.974220] i2c i2c-1: ioctl, cmd=0x703, arg=0x77
[  610.979815] i2c i2c-1: ioctl, cmd=0x720, arg=0xbebcac6c
[  610.985675] i2c i2c-1: master_xfer[0] W, addr=0x77, len=0
[  616.006564] sunxi_i2c_do_xfer()1967 - [i2c1] xfer timeout (dev addr:0x77)

所以这里还是有些不对劲...

kanken6174 LV 6

@yuzukitsuru 这是我的 TWI 配置：

&twi0 {
	clock-frequency = <400000>;
	pinctrl-0 = <&twi0_pins_a>;
	pinctrl-1 = <&twi0_pins_b>;
	pinctrl-names = "default", "sleep";
	/* For stability and backwards compatibility, we recommend setting ‘twi_drv_used’ to 0  */
	twi_drv_used = <0>;
	twi_pkt_interval = <0>;
	status = "okay";
};

&twi1 {
	clock-frequency = <400000>;
	pinctrl-0 = <&twi1_pins_a>;
	pinctrl-1 = <&twi1_pins_b>;
	pinctrl-names = "default", "sleep";
	/* For stability and backwards compatibility, we recommend setting ‘twi_drv_used’ to 0  */
	twi_drv_used = <0>;
	twi_pkt_interval = <0>;
	status = "okay";
};

&twi2 {
	clock-frequency = <400000>;
	pinctrl-0 = <&twi2_pins_a>;
	pinctrl-1 = <&twi2_pins_b>;
	pinctrl-names = "default", "sleep";
	/* For stability and backwards compatibility, we recommend setting ‘twi_drv_used’ to 0  */
	twi_drv_used = <0>;
	twi_pkt_interval = <0>;
	status = "okay";
};

&twi3 {
	clock-frequency = <400000>;
	pinctrl-0 = <&twi3_pins_a>;
	pinctrl-1 = <&twi3_pins_b>;
	pinctrl-names = "default", "sleep";
	/* For stability and backwards compatibility, we recommend setting ‘twi_drv_used’ to 0  */
	twi_drv_used = <0>;
	twi_pkt_interval = <0>;
	status = "disabled";
};

但 I2C 总线通常表现得很奇怪，如果我在总线上不放置任何东西，我会得到看起来很糟糕的信号（上升和下降时间长，并且它给我“xfer 不完整”错误），但是如果我在总线上放置一个设备 I2C 总线根本没有发送任何内容（并且我收到 xfer 超时错误）！

考虑到测量的时钟速度，它显然试图在 400khz 下工作，但这个信号看起来仍然很糟糕。我想知道这是否与 DTS 中的驱动强度设置有关。

awwwwa LV 8

dmesg -n 1 再运行测试命令

kanken6174 LV 6

@awwwwa 这确实消除了警告，所以感谢这一点，但是 i2cdetect 的结果仍然完全错过了总线上的任何 I2C 设备...所以根本问题仍然存在...

kanken6174 LV 6

我让它工作了！
我必须编辑 DTS 将驱动强度增加到 1，并将 1.8V 总线电压从 1.7V 提高到 2V 才能注册，现在我的相机出现了!

默认的 0 驱动强度永远不会起作用。编辑 DTS 是关键。

DOT小文哥 LV 8

66666666

whycanservice2 LV 8

@kanken6174 事实上i2c通讯速率不高，但对“沿”的要求非常高，需小于130ns，因此一定程度上可以看做高速信号处理，由于其控制器均为开漏输出，所以上拉电阻与线路寄生电容决定了沿的延迟。此处可以不必提高电压，选择减小上拉电阻是正确的办法。提高驱动能力是变相的减少了上拉电阻阻值。

kanken6174 LV 6

@whycanservice2 我已经将上拉电阻降低到2.5K，但当时仍然不起作用，我想我会尝试1K，看看是否可以降低上拉电压，同时仍然具有I2C功能。

awwwwa LV 8

@kanken6174 上拉是1.8V吗，还是上拉到3.3v了

whycanservice2 LV 8

@kanken6174 我记得在某个摄像头的硬件设计手册中看到过I2C 的上拉电阻典型2.2K.。。

kanken6174 LV 6

@awwwwa 它在端口 A 上，端口 A 仅是 1.8V 逻辑，因此上拉电阻拉至 1.8V。我确实在某个时候尝试过上拉至 3.3V，但当拉至 1.8V 时却没有任何效果。

Alb702 LV 5

@kanken6174 在 V851S I2C/TWI 损坏（xfer 错误) 中说：

。
您的波形图上不清楚信号的接地电平在哪里。无论如何，最后一颗黄色“牙齿”的“低”电平高于其余的电平冲动。也就是说，控制器输出“下拉”的强度不够。

全志GPIO有一个设置最大输出电流的寄存器：Px_DRVn。我不知道当选择TWI功能时这个设置是否有效。尝试在用户空间中通过 mmap 将寄存器地址简单地映射到内存进行试验。

关于上拉电阻。我在 Omnivision 传感器的文档中没有找到它，但对于 AR0330 传感器，建议值为 1.5 Kom。
我的 A20 和 V3S MCU 上具有此上拉电阻的所有设备都可以与使用的所有传感器配合使用，在 TWI 上没有出现故障。 3.3V 和 1.8V。

kanken6174 LV 6

@alb702 这个问题已经解决了，我只需要使用足够低的上拉电阻，并将DTS中I2C引脚的驱动强度设置为1，就可以正常工作了。我的主要问题是驱动强度设置

Jingyan LV 5

@kanken6174 不建议修改引脚驱动能力，因为i2c协议要求总线为弱上拉，提高IO驱动能力会使之变成强上拉

当VCC为1.8V时，上拉电阻应选用2K
当VCC为3.3V时，上拉电阻应选用4.7K

若无法正常使用，应排查走线质量与信号干扰。