Hello,
I'm working the nrfx saadc legacy driver, and despite changing whether I measure Vdd(on the dk) or GND, the saadc output(p_event->data.done.p_buffer[0]) oscillates between 300ish and 60,000ish, and the conversion is stuck around 830ish.
My current setup:
Board: nRF52840dk
OS: Windows
SDK: nRF SDK 17.0
IDE: Segger Embedded Studio
Attached is code that runs in the saadc example folder from the SDK. I tested my code by hooking a jumper from P(0,4) to Vdd and GND. Please let me know if there's anything I can do!
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/** @file
* @defgroup nrf_adc_example main.c
* @{
* @ingroup nrf_adc_example
* @brief ADC Example Application main file.
*
* This file contains the source code for a sample application using ADC.
*
* @image html example_board_setup_a.jpg "Use board setup A for this example."
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nrf.h"
#include "app_error.h"
#include "app_util_platform.h"
#include <nrfx_saadc.h>
#include <nrf_gpio.h>
#define BUFFER_SIZE 1
#define LED3 NRF_GPIO_PIN_MAP(0, 16)
#define LED4 NRF_GPIO_PIN_MAP(0, 15)
#define A0 NRF_GPIO_PIN_MAP(1, 12)
#define A8 NRF_GPIO_PIN_MAP(0, 4)
static nrf_saadc_value_t adcSampleBuffer[BUFFER_SIZE];
int counter = 0;
int counter1 = 0;
volatile int voltFlag = 0;
volatile nrfx_err_t err = 0;
volatile int calibrationFlag = 0;
nrfx_saadc_config_t saadc_config = NRFX_SAADC_DEFAULT_CONFIG;
nrf_saadc_channel_config_t saadc_channel_config = NRFX_SAADC_DEFAULT_CHANNEL_CONFIG_SE(A8);
void nrfx_saadc_event_handler(nrfx_saadc_evt_t const* p_event){
if (p_event->type == NRFX_SAADC_EVT_CALIBRATEDONE)
{
counter = nrfx_saadc_buffer_convert(adcSampleBuffer, BUFFER_SIZE);
calibrationFlag = 1;
}else
{
counter = nrfx_saadc_buffer_convert(adcSampleBuffer, BUFFER_SIZE);
voltFlag = 1;
}
}
int main(void)
{
nrf_gpio_cfg_output(LED3);
nrf_gpio_cfg_output(LED4);
counter = nrfx_saadc_init(&saadc_config, nrfx_saadc_event_handler) + 1;
counter = nrfx_saadc_channel_init(0, &saadc_channel_config) + 1;
counter = nrfx_saadc_calibrate_offset();
while(calibrationFlag == 0){
}
int durdle = 0;
while(1){
counter = nrfx_saadc_sample();
nrf_gpio_pin_toggle(LED4);
while(voltFlag == 0){
err++;
err %= 19;
durdle ++;
durdle %=19;
}
counter1 = (counter1 + 1)%1000;
if(counter1 == 0){
nrf_gpio_pin_toggle(LED3);
}
voltFlag = 0;
}
return 0;
}
/** @} */
