topic imx23evk eeprom access problem in i.MX Processors

imx23evk eeprom access problem

tonimartín — Wed, 18 Jun 2014 06:04:18 GMT

Hello.

I'm working with imx23evk and need to access to eeprom. I connect a NFC memory: M24LR04E

To memory access I'm use I2C protocol and change mx23evk.c with this options:

static struct at24_platform_data eeprom_platdata = {

.byte_len = 512,

.page_size = 4,

.flags = AT24_FLAG_ADDR16,

};

static struct i2c_board_info eeprom_i2c_device[] = {

{

I2C_BOARD_INFO("at24", 0x53), /* E0=0, E1=0, E2=0 */

.platform_data = &eeprom_platdata,

};

static void i2c_device_init(void)

{

i2c_register_board_info(0, &eeprom_i2c_device, 1);

}

When update the firmware and reboot imx233 appear a new directory:

root@freescale /sys/class/i2c-adapter/i2c-0/0-0053$ ls

bus eeprom name subsystem

driver modalias power uevent

But, when I try to access to memory, show this errors:

root@freescale /sys/class/i2c-adapter/i2c-0/0-0053$ i2cget 0 0x53

Error: Could not set address to 0x53: Device or resource busy

root@freescale /sys/class/i2c-adapter/i2c-0/0-0053$ hexdump eeprom

hexdump: eeprom: Remote I/O error

Why appear this error?. Is wrong configuration?. Any idea?

Thanks.

PeterChan — Mon, 23 Jun 2014 02:00:52 GMT

In your configuration, supposing

more /sys/class/i2c-adaptor/i2c-0/0-0053/eeprom > eeprom.txt | od -x

can dump the eeprom and echo something to /sys/class/i2c-adaptor/i2c-0/0-0053/eeprom can program the eeprom.

If this does not work, could you please check why at24_read() and at24_write() at driver/misc/eeprom/at24.c return error?

alejandrolozan1 — Tue, 24 Jun 2014 15:30:59 GMT

Hi,

Have you checked if there is any signal in the I2C_SCL and SDA?

Best Regards,

Alejandro

tonimartín — Tue, 08 Jul 2014 09:12:50 GMT

Hello.

Finally, there was a problem with the address of i2c.

This NFC memory is in 0xa6.

Thanks for the help.