#include <stdint.h>

#include "nrf_log.h"
#include "nrf_log_ctrl.h"

#include "nrf_drv_saadc.h"
#include "adc.h"


#define SAMPLES_IN_BUFFER 1               //Number of SAADC samples in RAM before returning a SAADC event. Do not change this constant for low power SAADC

static nrf_saadc_value_t       m_buffer_pool[2][SAMPLES_IN_BUFFER];
static uint32_t                m_adc_evt_counter;
void HardFault_Handler(void);


/*******************************************************************************************************************************************************************************************
 * @brief callback function for the ADC
 ******************************************************************************************************************************************************************************************/
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);

        NRF_LOG_INFO("ADC event number: %d\r\n",(int)m_adc_evt_counter);
				NRF_LOG_FLUSH();
        for (int i = 0; i < SAMPLES_IN_BUFFER; i++)
        {
            NRF_LOG_INFO("%d\r\n", p_event->data.done.p_buffer[i]);
						NRF_LOG_FLUSH();
        }
        m_adc_evt_counter++;
			
				
				nrf_drv_saadc_uninit();
        NRF_SAADC->INTENCLR = (SAADC_INTENCLR_END_Clear << SAADC_INTENCLR_END_Pos);
        NVIC_ClearPendingIRQ(SAADC_IRQn);
    }
}


/*******************************************************************************************************************************************************************************************
 * @brief Initialize the adc
 ******************************************************************************************************************************************************************************************/
void saadc_init(void)
{
    static ret_code_t err_code;
    nrf_saadc_channel_config_t channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN3);
		channel_config.gain = NRF_SAADC_GAIN1_6; 						// 1/6 divider so iput range is 0.0 - 3.6V with the internal reference of 0.6V
		channel_config.mode = NRF_SAADC_MODE_SINGLE_ENDED;
	
    err_code = nrf_drv_saadc_init(NULL, saadc_callback);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_channel_init(0, &channel_config);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);
}