I'm trying to demonstrate that I can write a value to a Nordic npm1300 register and read the same value back. Using the code below, I write 0x5a but read 0x0a, so the msb 5 is getting lost:
uint8_t pmic_config[] = {0x06, 0x01, 0x5a}; //register followed by value
ret = i2c_write_dt(&dev_i2c_pmic, pmic_config, 2);
if (ret != 0)
{
printk("Failed to write pmic register %x \n", pmic_config[0]);
return -1;
}
//read something from the pmic
int myVal = 0; //this will be returned
uint8_t regsy[] = {0x06, 0x01};
ret = i2c_write_read_dt(&dev_i2c_pmic, regsy, 2, &myVal, 1);
if (ret != 0)
{
printk("Failed to read pmic register %x%x \n", regsy[0], regsy[1]);
return -1;
}
else
{
printk("pmic Register 0x%x%x is 0x%x \n", regsy[0], regsy[1], myVal);
}
Result:
pmic Register 0x61 is 0xa
All the solutions I saw posted here used nrf_drv_twi_tx and nrf_drv_twi_rx which seem more complex than i2c_write_read_dt(), so it would be nice if there's a simple solution involving the code I shared above.
