/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    DMA/DMAMUX_RequestGen/Src/main.c
  * @author  MCD Application Team
  * @brief   This example shows how to use the DMA with the DMAMUX to 
  *          request generator using the stm32wlxx HAL API.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */ 

/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
__IO   uint32_t DMA_TransferErrorFlag = 0;

uint32_t SRC_Buffer_LED2_Toggle[2]  =
                                      {  LED2_PIN,   /*Value for LED2 ON  */
                                         0           /*Value for LED2 OFF */
                                      };

DMA_HandleTypeDef DMA_Handle;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
static void HAL_TransferError(DMA_HandleTypeDef *hdma);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
  HAL_DMA_MuxRequestGeneratorConfigTypeDef dmamux_ReqGenParams;
  
  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */
  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */
  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  /* USER CODE BEGIN 2 */
  /* -1- Initialize LEDs mounted on NUCLEO-WL55JC RevC board */
  BSP_LED_Init(LED2);
  BSP_LED_Init(LED3);

  /*##-2- Configure the DMA ##################################################*/
  /* Enable DMA1 clock */
  DMAx_CLK_ENABLE();

  /* Configure the DMA handler for Transmission process     */
  /* DMA mode is set to circular for an infinite DMA transfer */
  DMA_Handle.Instance                 = DMA1_Channel1;

  DMA_Handle.Init.Request             = DMA_REQUEST_GENERATOR0;
  DMA_Handle.Init.Direction           = DMA_MEMORY_TO_PERIPH;
  DMA_Handle.Init.PeriphInc           = DMA_PINC_DISABLE;
  DMA_Handle.Init.MemInc              = DMA_MINC_ENABLE;
  DMA_Handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
  DMA_Handle.Init.MemDataAlignment    = DMA_MDATAALIGN_WORD;
  DMA_Handle.Init.Mode                = DMA_CIRCULAR;
  DMA_Handle.Init.Priority            = DMA_PRIORITY_LOW;

  /* Initialize the DMA with for Transmission process */
  HAL_DMA_Init(&DMA_Handle);

  /* Register Error Callback */
  HAL_DMA_RegisterCallback(&DMA_Handle, HAL_DMA_XFER_ERROR_CB_ID, &HAL_TransferError);

  /* NVIC configuration for DMA transfer complete interrupt*/
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

  /*##-3- Configure and enable the DMAMUX Request generator  ####################*/
  dmamux_ReqGenParams.SignalID  = HAL_DMAMUX1_REQ_GEN_EXTI0;    /* External request signal is EXTI0 signal */
  dmamux_ReqGenParams.Polarity  = HAL_DMAMUX_REQ_GEN_RISING;    /* External request signal edge is Rising  */
  dmamux_ReqGenParams.RequestNumber = 1;                        /* 1 requests on each edge of the external request signal  */

  HAL_DMAEx_ConfigMuxRequestGenerator(&DMA_Handle, &dmamux_ReqGenParams);
  
  /* NVIC configuration for DMAMUX request generator overrun errors*/
  HAL_NVIC_SetPriority(DMAMUX1_OVR_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(DMAMUX1_OVR_IRQn);
  HAL_DMAEx_EnableMuxRequestGenerator (&DMA_Handle);

  /*##-4- Configure and enable the User push-button (B1) in EXTI mode used as DMA external request signal #####*/
  BSP_PB_Init(BUTTON_SW1, BUTTON_MODE_EXTI);

  /*##-5- Start the DMA transfer ################################################*/
  /* DMA source buffer is SRC_BUFFER_LED2_TOGGLE containing values to be written 
  to LED2 GPIO ODR register in order to turn LED2 On/Off each time comes a request from the DMAMUX request generator */  
  HAL_DMA_Start_IT(&DMA_Handle, (uint32_t)SRC_Buffer_LED2_Toggle, (uint32_t)&LED2_GPIO_PORT->ODR, 2);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
   if(DMA_TransferErrorFlag != 0)
    {
      Error_Handler();
    }
 

  }
   
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK3|RCC_CLOCKTYPE_HCLK
                              |RCC_CLOCKTYPE_SYSCLK|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;
  RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */

/**
  * @brief  This function is executed in case of DMA error occurrence.
  * @param  None
  * @retval None
  */
static void HAL_TransferError(DMA_HandleTypeDef *hdma)
{
  DMA_TransferErrorFlag = 1;
}

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* Turn LED3 on */
  BSP_LED_On(LED3);

  while(1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#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 CODE BEGIN 6 */
  /* Infinite loop */
  while (1)
  {
  }
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
