Hi All,
I am trying to communicate with IC MAX17201 using I2C interface. I am able to detect the IC and communicate with it.
When I read 8bit registers from the IC I don't have any issue. But when I am trying to read 16bit register from the IC, I am getting errors.The existing code from NRF SDK includes data to read and write 8 bit registers.
I have modified the code a bit in order to read 2bytes from register. I am not able to read 16bit registers. I tried to read NPACKCFG_REG but not able to read it properly. As well as while compiling I am getting warnings like this:-unsigned conversion from 'int' to 'uint8_t' {aka 'unsigned char'} changes value from '437' to '181' [-
#define NPACKCFG_REG 0x1B5
#define MAX17201_ADDRESS_LEN 1
#define MAX17201_ADDR (0xD8>>1)
#define MAX17201_WHO_AM_I 0x6BU
bool i2c_register_write_max17211(uint16_t register_address, uint16_t value)
{
ret_code_t err_code;
uint8_t tx_data[4];
tx_data[0] = ( (register_address >> 8)& 0xFF );
tx_data[1] = register_address & 0xFF;
tx_data[2] = ((value>>8)& 0xff);
tx_data[3] = value & 0xFF;
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, MAX17201_WHO_AM_I, tx_data, sizeof(tx_data), false);
//Wait until the transmission of the data is finished
while (m_xfer_done == false)
{
}
// if there is no error then return true else return false
if (NRF_SUCCESS != err_code)
{
NRF_LOG_INFO("FAILED");
return false;
}
NRF_LOG_INFO("SUCCESS");
return true;
}
bool i2c_register_read_max17211(uint8_t register_address, uint8_t destination[2], uint8_t number_of_bytes)
{
ret_code_t err_code;
//uint8_t rx_buffer[2];
//Set the flag to false to show the receiving is not yet completed
m_xfer_done = false;
// Send the Register address where we want to write the data
err_code = nrf_drv_twi_tx(&m_twi, MAX17201_WHO_AM_I, ®ister_address, 1, true);
//Wait for the transmission to get completed
while (m_xfer_done == false){}
//vTaskDelay(1000);
// If transmission was not successful, exit the function with false as return value
if (NRF_SUCCESS != err_code)
{
return false;
}
//set the flag again so that we can read data from the MPU6050's internal register
m_xfer_done = false;
// Receive the data from the MPU6050
//err_code = nrf_drv_twi_rx(&m_twi, MAX17201_WHO_AM_I, destination, number_of_bytes);
err_code = nrf_drv_twi_rx(&m_twi, MAX17201_WHO_AM_I, &destination[0], sizeof(destination));
//wait until the transmission is completed
while (m_xfer_done == false){}
//vTaskDelay(1000);
// if data was successfully read, return true else return false
if (NRF_SUCCESS != err_code)
{
return false;
}
//NRF_LOG_INFO("DATA IS %x",destination);
return true;
}
Please help me on how to read multiple bytes from 16bit registers and how to write data into 16 bit registers.
