/**
* @brief Function for main application entry.
*/
int main(void)
{
LEDS_CONFIGURE(BSP_LED_0_MASK);
LEDS_OFF(BSP_LED_0_MASK);
adc_config();
UNUSED_RETURN_VALUE(NRF_LOG_INIT());
NRF_LOG_PRINTF("ADC example\r\n");
while (true)
{
APP_ERROR_CHECK(nrf_drv_adc_buffer_convert(adc_buffer,ADC_BUFFER_SIZE));
uint32_t i;
for (i = 0; i < ADC_BUFFER_SIZE; i++)
{
// manually trigger ADC conversion
nrf_drv_adc_sample();
// enter into sleep mode
__SEV();
__WFE();
__WFE();
nrf_delay_ms(100);
LEDS_INVERT(BSP_LED_0_MASK);
}
}
}
/**
* @brief Function to trigger ADC sampling
*/
void adc_sample(void)
{
ret_code_t ret_code;
uint32_t p_is_running = 0;
ret_code = nrf_drv_adc_buffer_convert(adc_buffer, ADC_BUFFER_SIZE); // Allocate buffer for ADC
APP_ERROR_CHECK(ret_code);
//Request the external high frequency crystal for best ADC accuracy. For lowest current consumption, don't request the crystal.
sd_clock_hfclk_request();
while(! p_is_running) { //wait for the hfclk to be available
sd_clock_hfclk_is_running((&p_is_running));
}
for (uint32_t i = 0; i < ADC_BUFFER_SIZE; i++)
{
while((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) == ADC_BUSY_BUSY_Busy) {} //Wait until the ADC is finished sampling
NRF_LOG_INFO("Start sampling ... \r\n");
nrf_drv_adc_sample(); // Trigger ADC conversion
}
}
/**
* @brief ADC interrupt handler.
* Prints ADC results on hardware UART and over BLE via the NUS service.
*/
static void adc_event_handler(nrf_drv_adc_evt_t const * p_event)
{
uint8_t adc_result[ADC_BUFFER_SIZE*2];
if (p_event->type == NRF_DRV_ADC_EVT_DONE)
{
adc_event_counter++;
NRF_LOG_PRINTF(" adc event counter: %d\r\n", adc_event_counter);
for (uint32_t i = 0; i < p_event->data.done.size; i++)
{
NRF_LOG_PRINTF("ADC value channel %d: %d\r\n", (i % number_of_adc_channels), p_event->data.done.p_buffer[i]);
adc_result[(i*2)] = p_event->data.done.p_buffer[i] >> 8;
adc_result[(i*2)+1] = p_event->data.done.p_buffer[i];
}
if(ADC_BUFFER_SIZE <= 10)
{
ble_nus_string_send(&m_nus, &adc_result[0], ADC_BUFFER_SIZE*2);
}
APP_ERROR_CHECK(nrf_drv_adc_buffer_convert(adc_buffer,ADC_BUFFER_SIZE));
LEDS_INVERT(BSP_LED_3_MASK);
}
