#include "main.h"
#include "BSP_ADC.h"
#include "adc.h"
#include "stdbool.h"


#define TOTAL_ADC_CHANNELS 4
#define ADC_HISTORY_SIZE 4
#define ADC_BUFFER_SIZE (TOTAL_ADC_CHANNELS * ADC_HISTORY_SIZE)
#define ADC_CONVERTED_DATA_BUFFER_SIZE   ((uint32_t) ADC_BUFFER_SIZE)   /* Size of array aADCxConvertedData[] */
ALIGN_32BYTES (static uint16_t   aADCxConvertedData[ADC_CONVERTED_DATA_BUFFER_SIZE]);

#define ADC_CHANNEL_DIMMER 1
#define ADC_CHANNEL_BUS 3

static bool adcIsInitialized = false;

//start the ADC conversion
void BSP_ADC_Start()
{


  if (HAL_ADCEx_Calibration_Start(&hadc1, ADC_CALIB_OFFSET_LINEARITY, ADC_SINGLE_ENDED) != HAL_OK)
  {
    Error_Handler();
  }


  if (HAL_ADC_Start_DMA(&hadc1,
                        (uint32_t *)aADCxConvertedData,
                        ADC_CONVERTED_DATA_BUFFER_SIZE
                       ) != HAL_OK)
  {
    Error_Handler();
  }
  
    adcIsInitialized = true;

}


/**
  * @brief  Conversion complete callback in non-blocking mode
  * @param  hadc: ADC handle
  * @retval None
  */
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc)
{
  /* Invalidate Data Cache to get the updated content of the SRAM on the first half of the ADC converted data buffer: 32 bytes */
  //SCB_InvalidateDCache_by_Addr((uint32_t *) &aADCxConvertedData[0], ADC_CONVERTED_DATA_BUFFER_SIZE);
}

/**
  * @brief  Conversion DMA half-transfer callback in non-blocking mode
  * @param  hadc: ADC handle
  * @retval None
  */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
   /* Invalidate Data Cache to get the updated content of the SRAM on the second half of the ADC converted data buffer: 32 bytes */
  //SCB_InvalidateDCache_by_Addr((uint32_t *) &aADCxConvertedData[ADC_CONVERTED_DATA_BUFFER_SIZE/2], ADC_CONVERTED_DATA_BUFFER_SIZE);
}



float BSP_ADC_ReadValue( uint32_t channel, float factor) {
    if (!adcIsInitialized) {
        return 0;
    }
    // average the last 4 values of the dimmer ADC
    uint32_t sum = 0;
    for (int i = 0; i < ADC_HISTORY_SIZE; i++) {
        sum += aADCxConvertedData[channel + i * TOTAL_ADC_CHANNELS];
    }


    //convert raw ADC value to voltage
    float voltage = (float)sum / (float)ADC_HISTORY_SIZE / factor; // gemessan an sample pcb

    return voltage;

}

float BSP_ADC_ReadDimmerValue() {
    return BSP_ADC_ReadValue(ADC_CHANNEL_DIMMER, 4319.619048);

}


float BSP_ADC_ReadBusValue() {
    return BSP_ADC_ReadValue(ADC_CHANNEL_BUS, 4046.87186);
}