i.MX ProcessorsのトピックRe: I2C does't working

I2C does't working

PramodKumar — Fri, 07 Aug 2015 08:21:32 GMT

Hii

currently i am working on imx233 board and i use kernel version 2.6.35 by ltib.. i2c-mxs.object is proper created but my problem is that when i am using i2c .it is not working , i used bank 1 ,23 and 24 pin for i2c device but is not responding..

can anyone help me

Thanks&Regard

pramod kumar

Re: I2C does't working

BiyongSUN — Fri, 07 Aug 2015 09:02:46 GMT

if you are using the uboot you can issue i2c probe command to see if it can find device on the i2c bus.

also you can check the i2c wave on the oscilloscope.

Re: I2C does't working

PramodKumar — Fri, 07 Aug 2015 10:24:08 GMT

Hii

Biyong Sun

i am not working u-boot level ..i m working on kernel level in kernel version 2.6.35.3

Re: I2C does't working

BiyongSUN — Fri, 07 Aug 2015 11:06:02 GMT

kernel layer.

in the linux rootfs, you can find i2cdetect

How's the i2c wave on the oscilloscope. Did you measure that?

i2cdetect -l

i2c-0 i2c 21a0000.i2c I2C adapter

i2c-1 i2c 21a4000.i2c I2C adapter

i2c-2 i2c 21a8000.i2c I2C adapter

Re: I2C does't working

PramodKumar — Sat, 08 Aug 2015 05:04:30 GMT

Hii

Biyong Sun

i have cheked both of i2c pin using oscilloscope. its proper genreate the singal

and when i run i2cdetect -l command its show this messege

i2cdetect -l

i2c-0 i2c MXS I2C adapter I2C adapter

please tell me what i can do ?

Re: I2C does't working

BiyongSUN — Mon, 10 Aug 2015 12:41:17 GMT

Please make sure the iomux is correct.

then check the i2c wave on the oscilloscope.

Re: I2C does't working

PramodKumar — Tue, 11 Aug 2015 05:35:51 GMT

i have checked already i2c wave its proper generate signal ....can you tell me how to change the iomux confugration in ltib kernel varsion 2.6.35

this time i am using scl (1 ,23),sda(1,24) ....and i am currently working on imx233

like this

#define PINID_I2C_SCL	MXS_PIN_ENCODE(1, 23)
#define PINID_I2C_SDA	MXS_PIN_ENCODE(1, 24)

#if defined(CONFIG_I2C_MXS) || \

defined(CONFIG_I2C_MXS_MODULE)

{

.name = "I2C_SCL",

.id = PINID_I2C_SCL,

.fun = PIN_FUN2,

.strength = PAD_4MA,

.voltage = PAD_3_3V,

.drive = 1,

{

.name = "I2C_SDA",

.id = PINID_I2C_SDA,

.fun = PIN_FUN2,

.strength = PAD_4MA,

.voltage = PAD_3_3V,

.drive = 1,

Re: I2C does't working

BiyongSUN — Tue, 11 Aug 2015 22:05:59 GMT

If the wave can be captured, you can check each of the i2c start/read/write/stop form to see what's the i2c is doing that time.

Re: I2C does't working

PramodKumar — Wed, 12 Aug 2015 06:48:33 GMT

i have already checked open read and write by using i2c application open is proper work but and read write failed also read internal rtc but it is producing same .....

Re: I2C does't working

BiyongSUN — Thu, 13 Aug 2015 05:16:00 GMT

Where is the wave on the oscilloscope.

You can read the wave to check what's the issue.