/*
 * adc.c
 *
 *  Created on: Apr 13, 2022
 *      Author: bruce
 */

#include "adc.h"
#include "stm32l4xx.h"
#include "main.h"

ADC_HandleTypeDef hadc1;

/**
* @brief ADC MSP Initialization
* This function configures the hardware resources used in this example
* @param hadc: ADC handle pointer
* @retval None
*/
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
  if(hadc->Instance==ADC1)
  {
  /** Initializes the peripherals clock
  */
    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
    PeriphClkInit.AdcClockSelection = RCC_ADCCLKSOURCE_PLLSAI1;
    PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_HSI;
    PeriphClkInit.PLLSAI1.PLLSAI1M = 1;
    PeriphClkInit.PLLSAI1.PLLSAI1N = 8;
    PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV7;
    PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV2;
    PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV2;
    PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_ADC1CLK;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
	{
    	Error_Handler();
	}


    /* Peripheral clock enable */
    __HAL_RCC_ADC_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC1 GPIO Configuration
    PA0     ------> ADC1_IN5
    */
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG_ADC_CONTROL;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  }

}

/**
* @brief ADC MSP De-Initialization
* This function freeze the hardware resources used in this example
* @param hadc: ADC handle pointer
* @retval None
*/
void HAL_ADC_MspDeInit(ADC_HandleTypeDef* hadc)
{
  if(hadc->Instance==ADC1)
  {
    __HAL_RCC_ADC_CLK_DISABLE();
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_0);
  }

}

void ADC_Init () {
	  ADC_MultiModeTypeDef multimode = {0};
	  ADC_ChannelConfTypeDef sConfig = {0};

	  /** Common config
	  */
	  hadc1.Instance = ADC1;
	  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
	  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
	  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
	  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
	  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
	  hadc1.Init.LowPowerAutoWait = DISABLE;
	  hadc1.Init.ContinuousConvMode = DISABLE;
	  hadc1.Init.NbrOfConversion = 1;
	  hadc1.Init.DiscontinuousConvMode = DISABLE;
	  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
	  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
	  hadc1.Init.DMAContinuousRequests = DISABLE;
	  hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
	  hadc1.Init.OversamplingMode = DISABLE;
	  if (HAL_ADC_Init(&hadc1) != HAL_OK)
	  {
		  Error_Handler();
	  }

	  /** Configure the ADC multi-mode
	  */
	  multimode.Mode = ADC_MODE_INDEPENDENT;
	  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
	  {
		  Error_Handler();
	  }


	  /** Configure Regular Channel
	  */
	  sConfig.Channel = ADC_CHANNEL;
	  sConfig.Rank = ADC_REGULAR_RANK_1;
	  sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
	  sConfig.SingleDiff = ADC_SINGLE_ENDED;
	  sConfig.OffsetNumber = ADC_OFFSET_NONE;
	  sConfig.Offset = 0;
	  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig)  != HAL_OK)
	  {
		  Error_Handler();
	  }
}

void ADC_Start () {
	HAL_ADC_Start (&hadc1);
}

uint32_t ADC_Read_Value_Blocking () {
	HAL_ADC_PollForConversion (&hadc1, 10);
	return HAL_ADC_GetValue (&hadc1);
}