I am implementing SPI communication between the intanRHD2132 (ADC) and nRF52840.
I need to periodically send commands (READ, WRITE, etc.) to the intanRHD2132 (ADC). To achieve this, I am using a TIMER to control the SPI communication.
The commands need to be sent in 16-bit units (I will attach the datasheet for the intanRHD2132, refer to pages 15-16).
Here is a summary of my code:
- The TIMER handler is executed at intervals defined by TIME_TO_WAIT_US. SPI communication occurs within the TIMER handler.
- In the SPI communication handler function, the buffer value is replaced to send the next command.
However, I encountered a few issues. When I set the value of TIME_TO_WAIT_US to 42 or less, a 'spi transfer failed' error occurs. I want to set the TIME_TO_WAIT_US value between 1-10. I am curious about the cause of the issue and if there is any solution for this?
Here is the relevant part of my code:
#define TIME_TO_WAIT_US 5
static void spim_handler(nrfx_spim_evt_t const * p_event, void * p_context)
{
if(num==30){
cleanup_spi(spim_inst.p_reg);
}
int index=0;
if (p_event->type == NRFX_SPIM_EVENT_DONE)
{
num++;
index = 2*(num-1);
M_tx_buffer[0]=Command[num][0]; M_tx_buffer[1]=Command[num][1];
result[index]=M_rx_buffer[0]; result[index+1]=M_rx_buffer[1];
}
}
void send_16bit_data() {
nrfx_err_t err_code = nrfx_spim_xfer(&spim_inst, &spim_xfer_desc, 0);
if (err_code != NRFX_SUCCESS) {
NRFX_LOG_ERROR("SPI transfer failed: %d", err_code);
}
}
static void timer_handler(nrf_timer_event_t event_type, void * p_context)
{
if(num==30){
cleanup_timer(&timer_inst);
}
if(event_type == NRF_TIMER_EVENT_COMPARE0)
{
NRFX_LOG_INFO("num %d>> tx: 0x%02x%02x",num, M_tx_buffer[0], M_tx_buffer[1]);
send_16bit_data();
}
}
