Hi,
I am working with an nRF52832 in the nRF52-DK. I am trying to use the ADC with timers through PPI. I have a timer with five CC events, and one of them through ADC measurements. I think this is working fine. However, when I take a look at the content of the buffer, results are weird. I tried connecting the AI1 pin to VDD a GND, and I always get the same measure. What can be happening? I attach here the functions in which I configure the ADC and handle events.
Thanks in advanced.
#include "app_uart.h"
#include "boards.h"
#include "nrf_drv_saadc.h"
#include "my_constants.h"
#include "my_functions.h"
static nrf_saadc_value_t adc_buffer[ADC_SAMPLES] = {0};
static uint16_t adc_voltage[ADC_SAMPLES] = {0};
void adc_init(void) {
uint32_t * p_err_code = get_err_code();
nrf_drv_saadc_config_t saadc_config = NRF_DRV_SAADC_DEFAULT_CONFIG;
saadc_config.resolution = NRF_SAADC_RESOLUTION_12BIT;
saadc_config.oversample = NRF_SAADC_OVERSAMPLE_DISABLED;
nrf_saadc_channel_config_t channel_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(PIN_ASIC_OUTA);
channel_config.acq_time = NRF_SAADC_ACQTIME_20US;
channel_config.gain = NRF_SAADC_GAIN1_6;
channel_config.reference = NRF_SAADC_REFERENCE_INTERNAL;
*p_err_code = nrf_drv_saadc_init(&saadc_config, adc_handler);
if (*p_err_code == NRF_ERROR_INVALID_STATE) {
nrf_drv_saadc_uninit();
*p_err_code = nrf_drv_saadc_init(&saadc_config, adc_handler);
}
*p_err_code = nrf_drv_saadc_channel_init(0, &channel_config);
*p_err_code = nrf_drv_saadc_buffer_convert(adc_buffer, ADC_SAMPLES);
}
void adc_handler(nrf_drv_saadc_evt_t const * p_event) {
uint32_t * p_err_code = get_err_code();
if (p_event->type == NRF_DRV_SAADC_EVT_DONE) {
int i = 0;
for (i=0; i<ADC_SAMPLES; i++) {
adc_voltage[i] = adc_buffer[i]*600*6/4096;
}
*p_err_code = nrf_drv_saadc_buffer_convert(adc_buffer, ADC_SAMPLES);
}
}
