/**
  ******************************************************************************
  * @file    ADC/ADC_RegularConversion_Polling/Src/main.c 
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    18-June-2014
  * @brief   This example describes how to use Polling mode to convert data,
  *          through the STM32L0xx HAL API.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

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

/** @addtogroup STM32L0xx_HAL_Examples
  * @{
  */

/** @addtogroup ADC_DMA_Transfer
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* ADC handle declaration */
ADC_HandleTypeDef             AdcHandle;

/* ADC channel configuration structure declaration */
ADC_ChannelConfTypeDef        sConfig;

/* Variable used to get converted value */
__IO uint32_t uwADCxConvertedValue = 0;

/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Error_Handler(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
 /* This sample code shows how to convert an analog input and read the converted
    data using Polling mode.
    To proceed, 5 steps are required: */
  
  /* STM32L0xx HAL library initialization:
       - Configure the Flash prefetch, Flash preread and Buffer caches
       - Systick timer is configured by default as source of time base, but user 
             can eventually implement his proper time base source (a general purpose 
             timer for example or other time source), keeping in mind that Time base 
             duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
             handled in milliseconds basis.
       - Low Level Initialization
     */
  HAL_Init();
  
  /* Configure the System clock to have a frequency of 2 MHz (Up to 32MHZ possible) */
  SystemClock_Config();


  /* ### - 1 - Initialize ADC peripheral #################################### */
  /*
   *  Instance                  = ADC1.
   *  OversamplingMode          = Disabled
   *  ClockPrescaler            = PCLK clock with no division.
   *  LowPowerAutoOff           = Disabled (For this exemple continuous mode is enabled with software start)
   *  LowPowerFrequencyMode     = Enabled (To be enabled only if ADC clock is lower than 2.8MHz) 
   *  LowPowerAutoWait          = Enabled (New conversion starts only when the previous conversion is completed)       
   *  Resolution                = 12 bit (increased to 16 bit with oversampler)
   *  SamplingTime              = 7.5 cycles od ADC clock.
   *  ScanDirection             = Upward 
   *  DataAlign                 = Right
   *  ContinuousConvMode        = Enabled
   *  DiscontinuousConvMode     = Disabled
   *  ExternalTrigConvEdge      = None (Software start)
   *  EOCSelection              = End Of Conversion event
   *  DMAContinuousRequests     = DISABLE
   */

  AdcHandle.Instance = ADC1;
  
  AdcHandle.Init.OversamplingMode      = DISABLE;
  
  AdcHandle.Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV1;
  AdcHandle.Init.LowPowerAutoOff       = DISABLE;
  AdcHandle.Init.LowPowerFrequencyMode = ENABLE;
  AdcHandle.Init.LowPowerAutoWait      = ENABLE;
    
  AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
  AdcHandle.Init.SamplingTime          = ADC_SAMPLETIME_7CYCLES_5;
  AdcHandle.Init.ScanDirection         = ADC_SCAN_DIRECTION_UPWARD;
  AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
  AdcHandle.Init.ContinuousConvMode    = ENABLE;
  AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIG_EDGE_NONE;
  AdcHandle.Init.EOCSelection          = EOC_SINGLE_CONV;
  AdcHandle.Init.DMAContinuousRequests = DISABLE;
 
  /* Initialize ADC peripheral according to the passed parameters */
  if (HAL_ADC_Init(&AdcHandle) != HAL_OK)
  {
    Error_Handler();
  }
  
  
  /* ### - 2 - Start calibration ############################################ */
  if (HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_SINGLE_ENDED) != HAL_OK)
  {
    Error_Handler();
  }
  
  /* ### - 3 - Channel configuration ######################################## */
  /* Select Channel 0 to be converted */
  sConfig.Channel = ADC_CHANNEL_0;    
  if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
  
 /*##- 4- Start the conversion process #######################################*/  
  if(HAL_ADC_Start(&AdcHandle) != HAL_OK)
  {
    /* Start Conversation Error */
    Error_Handler();
  }
  
  /*##- 5- Wait for the end of conversion #####################################*/  
   /*  Before starting a new conversion, you need to check the current state of 
        the peripheral; if it’s busy you need to wait for the end of current
        conversion before starting a new one.
        For simplicity reasons, this example is just waiting till the end of the 
        conversion, but application may perform other tasks while conversion 
        operation is ongoing. */
  HAL_ADC_PollForConversion(&AdcHandle, 10);
  
  /* Check if the continous conversion of regular channel is finished */
  if(HAL_ADC_GetState(&AdcHandle) == HAL_ADC_STATE_EOC)
  {
    /*##-5- Get the converted value of regular channel  ########################*/
    uwADCxConvertedValue = HAL_ADC_GetValue(&AdcHandle);
  }
    
  /* Infinite loop */
  while(1)
  {
  }

}
  
/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = MSI
  *            SYSCLK(Hz)                     = 2000000
  *            HCLK(Hz)                       = 2000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            APB2 Prescaler                 = 1
  *            Flash Latency(WS)              = 0
  *            Main regulator output voltage  = Scale3 mode
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* Enable MSI Oscillator */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;
  RCC_OscInitStruct.MSICalibrationValue=0x00;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
    
  /* Select MSI as system clock source and configure the HCLK, PCLK1 and PCLK2 
     clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;  
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;  
  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Infinite loop */
  while(1)
  {
  }
}
#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */ 

/**
  * @}
  */ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
