/*
 * adc.c
 *
 *  Created on: Aug 9, 2016
 *      Author: Nicholas Orlando
 */

/* Includes ------------------------------------------------------------------*/
#include "adc.h"

#include "gpio.h"
#include "dma.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

// Peripheral Handles
ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;


// Private Variables
static uint16_t adc_readings[3];


uint16_t get_viout_counts(void)
{
	return adc_readings[ADC_CHAN_VIOUT];
}

uint16_t get_vgiout_counts(void)
{
	return adc_readings[ADC_CHAN_GAIN_VIOUT];
}

uint16_t get_vbat_counts(void)
{
	return adc_readings[ADC_CHAN_VBAT];
}

/* ADC1 init function */
void adc_init(void)
{
	/* Peripheral clock enable */
	__HAL_RCC_ADC1_CLK_ENABLE();
	__HAL_RCC_DMA1_CLK_ENABLE();
	__HAL_RCC_GPIOA_CLK_ENABLE();

	GPIO_InitTypeDef GPIO_InitStruct;

	/**ADC1 GPIO Configuration
	PA0     ------> ADC1_IN1
	PA1     ------> ADC1_IN2
	PA2     ------> ADC1_IN3
	*/
	GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2;
	GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);



	/**Common config
	*/
	hadc1.Instance = ADC1;
	hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
	hadc1.Init.Resolution = ADC_RESOLUTION_12B;
	hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
	hadc1.Init.ContinuousConvMode = ENABLE;
	hadc1.Init.DiscontinuousConvMode = DISABLE;
	hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
	hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
	hadc1.Init.NbrOfConversion = 3;
	hadc1.Init.DMAContinuousRequests = ENABLE;
	hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
	hadc1.Init.LowPowerAutoWait = DISABLE;
	hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
	HAL_ADC_Init(&hadc1);


	/* Peripheral DMA init*/

	hdma_adc1.Instance = DMA1_Channel1;
	hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
	hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
	hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
	hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
	hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
	hdma_adc1.Init.Mode = DMA_CIRCULAR;
	hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;
	HAL_DMA_Init(&hdma_adc1);

	__HAL_LINKDMA(&hadc1,DMA_Handle,hdma_adc1);


	ADC_ChannelConfTypeDef sConfig;

	// Configure VIOUT channel
	sConfig.Channel = ADC_CHANNEL_1;
	sConfig.Rank = ADC_REGULAR_RANK_1;
	sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5;
	HAL_ADC_ConfigChannel(&hadc1, &sConfig);

	// Configure VIOUT-GAINS channel
	sConfig.Channel = ADC_CHANNEL_2;
	sConfig.Rank = ADC_REGULAR_RANK_2;
	sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5;
	HAL_ADC_ConfigChannel(&hadc1, &sConfig);

	// Configure VBAT channel
	sConfig.Channel = ADC_CHANNEL_3;
	sConfig.Rank = ADC_REGULAR_RANK_3;
	sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5;
	HAL_ADC_ConfigChannel(&hadc1, &sConfig);


	HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adc_readings, 3);


//  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
//  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

}