AWR1642: How to use I2C driver to program PMIC LP87702-Q1 ?

Hi Kris,

Please refer the code below:

To read the PMIC version register. And the steps I have done are listed below:

1. Pinmux initial

2. i2cParams.transferMode = I2C_MODE_BLOCKING;

3. arg = 0; errCode = I2C_control (i2cHandle, I2C_CMD_ADDR_MODE, (void* )&arg); //arg set to 0, and the I2C addr mode is 7-bit.

4. To read the PMIC version register

txData[0] = 0x01;// version register’s address in PMIC’s datasheet

i2cTransaction.slaveAddress = 0x60;//PMIC’s address

i2cTransaction.writeBuf = txData;

i2cTransaction.writeCount = 1;//need to write the version register’s address to PMIC first

i2cTransaction.readBuf = rxData;

i2cTransaction.readCount = 1;//read the version register’s value(8bit)

retVal = I2C_transfer(i2cHandle, &i2cTransaction); // read the register

printf("version =0x%x\r\n", rxData[0]);//printf the result.

5. To Write the PMIC register and set the buck3 output voltage to 2.0V

txData[0] = 0x10; // buck3 output voltage register’s address in PMIC’s datasheet

txData[1] = 0XC0; //default=0xca,2.3V. 0XC0=2.0V, buck3 output voltage register’s value

i2cTransaction.slaveAddress = 0x60;//PMIC’s address

i2cTransaction.writeBuf = txData;

i2cTransaction.writeCount = 2;//need to write the voltage register’s address first, then write the value

i2cTransaction.readBuf = rxData;

i2cTransaction.readCount = 0;//it’s no need to read

retVal = I2C_transfer(i2cHandle, &i2cTransaction); // write the register

You can find more PMIC’s register details in PMIC’s datasheet.

Regards,

Wesley