TWI, Always get ANACK error?

[Mitch996]

Hi, when trying to read a register from a chip using the IIC interface,blocking mode:

uint32_t ms5837_cmd_read(uint8_t *data, uint8_t length, uint8_t register_address)
{
uint32_t err_code;
err_code = nrf_drv_twi_tx(&m_twi_ms_5837, MS5837_TWI_ADDR, &register_address ,  1, true);



if (NRF_SUCCESS == err_code)
	
   err_code = nrf_drv_twi_rx(&m_twi_ms_5837, MS5837_TWI_ADDR, data, length, false);
		
	
APP_ERROR_CHECK(err_code);
	return err_code;	
}			

I always get the "enternal error", 0x03.

I looked up the register and found this:

As you can see, there is an ANACK error, suggesting there isn't an ACK after address write.

What should I do to solve this???

Help!!!!

@endnode can you please provide a little insight?

[Mitch996]

One more thing, do I have to write to TASKS_STOP register to generate a STOP pattern? What value should I write to task registers? 0x01? 0xFFFFFFFF? Any value?