nrf52 saadc one-shot

Hello,

following the peripheral/saadc sample, which shows the periodic reading... could you please share the essential and minimal config for the One-Shot measurement?

Thank you

  • Hi,

    You can refer to this example to see how you can do blocking single shot SAADC sampling, which is the simplest way of doing it. You can drop this main.c file directly into the SAADC example of SDK 16.0.0 and test it.

    main.c
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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 "nrf_drv_saadc.h"
    #include "nrf_drv_ppi.h"
    #include "nrf_drv_timer.h"
    #include "boards.h"
    #include "app_error.h"
    #include "nrf_delay.h"
    #include "app_util_platform.h"
    #include "nrf_pwr_mgmt.h"
    
    #include "nrf_log.h"
    #include "nrf_log_ctrl.h"
    #include "nrf_log_default_backends.h"
    
    
    #define SAADC_CHANNEL 0
    
    
    /**
     * @brief Not used in this example, but driver API requiers a callback function to be proivded.
     */
    void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
    {
    }
    
    
    /**
     * @brief Function for confguring SAADC channel 0 for sampling AIN0 (P0.02).
     */
    void saadc_init(void)
    {
        ret_code_t err_code;
        nrf_saadc_channel_config_t channel_config =
            NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);
    
        err_code = nrf_drv_saadc_init(NULL, saadc_callback);
        APP_ERROR_CHECK(err_code);
    
        err_code = nrf_drv_saadc_channel_init(SAADC_CHANNEL, &channel_config);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /**
     * @brief Function for main application entry.
     */
    int main(void)
    {
        ret_code_t err_code;
        nrf_saadc_value_t sample;
    
        err_code = NRF_LOG_INIT(NULL);
        APP_ERROR_CHECK(err_code);
    
        NRF_LOG_DEFAULT_BACKENDS_INIT();
    
        saadc_init();
    
        NRF_LOG_INFO("SAADC HAL simple example started.");
    
        while (1)
        {
            err_code = nrfx_saadc_sample_convert(SAADC_CHANNEL, &sample);
            APP_ERROR_CHECK(err_code);
    
            NRF_LOG_INFO("Sample: %i", sample);
    
            NRF_LOG_FLUSH();
    
            nrf_delay_ms(1000);
        }
    }
    
    
    /** @} */
    

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