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AM6442: AM64x-evm i2c-0 AT24CM01 problem

Thinh Nguyen
Intellectual 825 points
Part Number: AM6442
Other Parts Discussed in Thread: INA226

Dear TI supporters,

I have tried to test I2C-0 by the following command:

root@am64xx-evm:/# i2cget -y 1 0x40 0 w
0x2741
root@am64xx-evm:/# i2cdetect -l
i2c-3   i2c             OMAP I2C adapter                        I2C adapter
i2c-1   i2c             OMAP I2C adapter                        I2C adapter
i2c-2   i2c             OMAP I2C adapter                        I2C adapter
i2c-0   i2c             OMAP I2C adapter                        I2C adapter
root@am64xx-evm:/# i2cget -y 0 0x50 0x0 w
0xffff
root@am64xx-evm:/# i2cget -y 0 0x51 0x0 w
0xffff
root@am64xx-evm:/# i2cset  -y 0 0x51 0x0f 0x55aa w
root@am64xx-evm:/# i2cget -y 0 0x51 0x0f w
0xffff
root@am64xx-evm:/# i2cget -y 1 0x40 0 w
0x2741
root@am64xx-evm:/#

I also tried to read I2C_1_INA226_VDD_CORE_ADD 0x40 that works well.

I didn't know why I couldn't read data from EEPROM on I2C-0

  • 0
    TI__Guru** 102350 points

    Hello Thinh,

    I apologize for the delayed response. It might be another couple of days before I am able to run tests. Could you talk me through what you are trying to do?

    Regards,

    Nick

  • 0 in reply to Nick Saulnier
    Intellectual 825 points

    Hello Nick,

    My application has an EEPROM on I2C0 bus, so I want to test/practice on the EVM kit first.

    I used the i2c tools to read data from all internal addresses of EEPROM, the return value always is 0xFF as first my message.

    After that I write a small i2c application run on userspace as below:

    -open file device.

    -set I2C_slave address,

    -Read/write SMBUS with word mode.

    The return value of Read() still is 0xFFFF.

    I don't know why?