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 *
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 *    list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
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 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
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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 SAMPLES_IN_BUFFER 1
#define SAADC_BURST_MODE 1                        //Set to 1 to enable BURST mode, otherwise set to 0.

volatile uint8_t state = 1;

static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(0);
static nrf_saadc_value_t     m_buffer_pool[1][SAMPLES_IN_BUFFER];
static nrf_ppi_channel_t     m_ppi_channel;
static uint32_t              m_adc_evt_counter;


void timer_handler(nrf_timer_event_t event_type, void * p_context)
{

}


//void saadc_sampling_event_init(void)
//{
//    ret_code_t err_code;
//
//    err_code = nrf_drv_ppi_init();
//    APP_ERROR_CHECK(err_code);
//
//    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
//    timer_cfg.bit_width = NRF_TIMER_BIT_WIDTH_32;
//    err_code = nrf_drv_timer_init(&m_timer, &timer_cfg, timer_handler);
//    APP_ERROR_CHECK(err_code);
//
//    /* setup m_timer for compare event every 400ms */
//    uint32_t ticks = nrf_drv_timer_ms_to_ticks(&m_timer, 1000);
//    nrf_drv_timer_extended_compare(&m_timer,
//                                   NRF_TIMER_CC_CHANNEL0,
//                                   ticks,
//                                   NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
//                                   false);
//    nrf_drv_timer_enable(&m_timer);
//
//    uint32_t timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&m_timer,
//                                                                                NRF_TIMER_CC_CHANNEL0);
//    uint32_t saadc_sample_task_addr   = nrf_drv_saadc_sample_task_get();
//
//    /* setup ppi channel so that timer compare event is triggering sample task in SAADC */
//    err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
//    APP_ERROR_CHECK(err_code);
//
//    err_code = nrf_drv_ppi_channel_assign(m_ppi_channel,
//                                          timer_compare_event_addr,
//                                          saadc_sample_task_addr);
//    APP_ERROR_CHECK(err_code);
//}


//void saadc_sampling_event_enable(void)
//{
//    ret_code_t err_code = nrf_drv_ppi_channel_enable(m_ppi_channel);
//
//    APP_ERROR_CHECK(err_code);
//}


void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        ret_code_t err_code;

        err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
        APP_ERROR_CHECK(err_code);

        
        int i;
        NRF_LOG_INFO("ADC event number: %d", (int)m_adc_evt_counter);

        for (i = 0; i < SAMPLES_IN_BUFFER; i++)
        {
            NRF_LOG_INFO("%d", p_event->data.done.p_buffer[i]);
        }
        m_adc_evt_counter++;
    }
}


void saadc_init(void)
{
    ret_code_t err_code;
    nrf_drv_saadc_config_t saadc_config;
    saadc_config.resolution = NRF_SAADC_RESOLUTION_12BIT;   //12 bit resolution

    //saadc_config.oversample = NRF_SAADC_OVERSAMPLE_4X;

    nrf_saadc_channel_config_t channel_config =
        NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);  //singale shot and channel config 
        
   channel_config.gain = NRF_SAADC_GAIN1_4;
   channel_config.reference = NRF_SAADC_REFERENCE_VDD4;
   channel_config.mode = NRF_SAADC_MODE_SINGLE_ENDED;
   channel_config.pin_n = NRF_SAADC_INPUT_DISABLED; 
   channel_config.pin_p = NRF_SAADC_INPUT_AIN2;
   channel_config.resistor_n = NRF_SAADC_RESISTOR_DISABLED;
   channel_config.resistor_p = NRF_SAADC_RESISTOR_DISABLED;

    err_code = nrf_drv_saadc_init(NULL, saadc_callback);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_channel_init(2, &channel_config);
    APP_ERROR_CHECK(err_code);
   
//    if(SAADC_BURST_MODE)
//    {
//       NRF_SAADC->CH[2].CONFIG |= 0x01000000;
//    }
    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);

 //   NRF_LOG_INFO("%d", m_buffer_pool[0]);
//    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
//    APP_ERROR_CHECK(err_code);

}

void saadc_sampling_trigger(void)
{
    ret_code_t err_code;
    //Event handler is called immediately after conversion is finished.
    err_code = nrf_drv_saadc_sample(); // Check error
    APP_ERROR_CHECK(err_code);
}

/**
 * @brief Function for main application entry.
 */
int main(void)
{
    uint32_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();

//    ret_code_t ret_code = nrf_pwr_mgmt_init();
//    APP_ERROR_CHECK(ret_code);

    saadc_init();
    //saadc_sampling_event_init();
    //saadc_sampling_event_enable();
    NRF_LOG_INFO("SAADC HAL simple example started.");

    while (1)
    {
        //nrf_pwr_mgmt_run();
        saadc_sampling_trigger();
        nrf_delay_ms(1000);
        NRF_LOG_FLUSH();
    }
}


/** @} */