PROCESSOR-SDK-J721E: MCU1_0 I2C timeout on transfer using I2C0 of main domain

Sergio Medina

Tool/software:

Hi TI team,

I am using pdk_jacinto_09_02_00_30 of ti-processor-sdk-rtos-j721e-evm-09_02_00_05 and I am trying to read data from an IO expander using I2C0 of main domain using MCU1_0.

I took eeprom_read test as reference to configure the I2C channel, but when I try to read data from the device, I get a timeout error.

 I2C_HwAttrs i2cCfg;
 I2C_Params i2cParams;
 I2C_Handle handle;
 I2C_Transaction i2cTransaction;
 int16_t status;

 I2C_init();

 I2C_socGetInitCfg(0U, &i2cCfg); 
 i2cCfg.baseAddr   = CSL_I2C0_CFG_BASE;
 i2cCfg.enableIntr = 0U;
 I2C_socSetInitCfg(0U, &i2cCfg);

 I2C_Params_init(&i2cParams);
 i2cParams.transferMode = I2C_MODE_BLOCKING;
 i2cParams.bitRate      = I2C_100kHz;

 handle = I2C_open(0U, &i2cParams);
 if(NULL == handle)
 { 
     UART_printf("I2C open FAILED!\n");
 }
 else
 {
     UART_printf("I2C open SUCCEEDED\n");
 }

 uint8_t reg = 0x02;
 uint8_t data = 0U;
 I2C_transactionInit(&i2cTransaction);
 i2cTransaction.slaveAddress = 0x74;
 i2cTransaction.writeBuf     = &reg;
 i2cTransaction.writeCount   = 1U;
 i2cTransaction.readBuf      = &data;
 i2cTransaction.readCount    = sizeof(data);
 i2cTransaction.timeout      = 100U;
 status = I2C_transfer(handle, &i2cTransaction);

 if(I2C_STS_SUCCESS != status)
 {
     DEBUG_LOG("Read Data Transfer failed. Status: %d", status);
 }

Am I missing something?

2 months ago

0 Neehar Sawant 2 months ago

TI__Genius 13690 points

Hi,

Are you able to successfully run the I2C eeprom read example?

Is this issue occurring on a TI EVM or custom board?

Thanks,

Neehar

0 Sergio Medina 2 months ago in reply to Neehar Sawant

Prodigy 50 points

Hi,

I have not run I2C eeprom read example, but I have other io expanders connected to I2C0 of main domain (CSL_MCU_I2C0_CFG_BASE) and I2C0 of wake up domain (CSL_WKUP_I2C0_CFG_BASE). In those channels, I am able to read data properly using this algorithm.

The issue is occurring in a custom board that use to run with sdk7, and we are migrating to sdk9.

Thanks,

Sergio

0 Neehar Sawant 2 months ago in reply to Sergio Medina

TI__Genius 13690 points

Hi Sergio,

Sergio Medina said:
but I have other io expanders connected to I2C0 of main domain (CSL_MCU_I2C0_CFG_BASE)

Can you test with using I2C_WAIT_FOREVER as the timeout value? Additionally, are you operating in blocking or callback mode?

Thanks,

Neehar

0 Sergio Medina 2 months ago in reply to Neehar Sawant

Prodigy 50 points

Hi,

I solved the issue. A72 was stuck at uboot, after uboot starts Linux, main domain I2C0 becomes active, and it is possible to read data properly.

Thanks,

Sergio

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PROCESSOR-SDK-J721E: MCU1_0 I2C timeout on transfer using I2C0 of main domain