RE: SPIM, recieve on first transmit

erltot — Thu, 14 Sep 2017 16:54:15 GMT

Never mind, I feel silly - I had misunderstood how the driver works. It works as expected now.

For reference, all data transmitted though MISO is stored in arr_rxBuf, for this case I just had to set

nrf_drv_spi_transfer(&spi, p_txBuf, 2, arr_rxBuf, 2);

in order to read DATA MSB and DATA LSB.

For the other case:

I just had to call

nrf_drv_spi_transfer(&spi, p_txBuf, 2, arr_rxBuf, 4);

and DATA MSB, DATA LSB, CONFIG MSB, and CONFIG LSB is recieved in arr_rxBuf[0..3]