RE: nRF52 - SPIM - read buffer empty

Ole Bauck — Wed, 11 Jan 2017 15:26:52 GMT

Don't know if this is the root cause of your problem, but you should not pass tx_buffer or rx_buffer as NULL and the length as non-zero. You can see that the nrf_drv_spi_xfer(..) function checks for this at the start of the function (the code will not assert unless NRF_ASSERT_PRESENT is defined):

ASSERT(p_xfer_desc->p_tx_buffer != NULL || p_xfer_desc->tx_length == 0);
ASSERT(p_xfer_desc->p_rx_buffer != NULL || p_xfer_desc->rx_length == 0);

(the assert will trigger if the input is zero).