/**
  ******************************************************************************
  * @file    I2C/I2C_TwoBoards_ComDMA/Src/stm32f0xxhal_msp.c
  * @author  MCD Application Team
  * @brief   HAL MSP module.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

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

/** @addtogroup STM32F0xx_HAL_Examples
  * @{
  */

/** @defgroup HAL_MSP
  * @brief HAL MSP module.
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup HAL_MSP_Private_Functions
  * @{
  */

/**
  * @brief I2C MSP Initialization 
  *        This function configures the hardware resources used in this example: 
  *           - Peripheral's clock enable
  *           - Peripheral's GPIO Configuration  
  *           - DMA configuration for transmission request by peripheral 
  *           - NVIC configuration for DMA interrupt request enable
  * @param hi2c: I2C handle pointer
  * @retval None
  */
void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c)
{
  GPIO_InitTypeDef  GPIO_InitStruct;
  static DMA_HandleTypeDef hdma_tx;
  static DMA_HandleTypeDef hdma_rx;
  RCC_PeriphCLKInitTypeDef  RCC_PeriphCLKInitStruct;
  
  /*##-1- Configure the I2C clock source. The clock is derived from the SYSCLK #*/
  RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2Cx;
  RCC_PeriphCLKInitStruct.I2c1ClockSelection = RCC_I2CxCLKSOURCE_SYSCLK;
  HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);

  /*##-2- Enable peripherals and GPIO Clocks #################################*/
  /* Enable GPIO TX/RX clock */
  I2Cx_SCL_GPIO_CLK_ENABLE();
  I2Cx_SDA_GPIO_CLK_ENABLE();
  /* Enable I2Cx clock */
  I2Cx_CLK_ENABLE();

  /* Enable DMAx clock */
  I2Cx_DMA_CLK_ENABLE();
  
  /*##-3- Configure peripheral GPIO ##########################################*/  
  /* I2C TX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = I2Cx_SCL_PIN;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = I2Cx_SCL_SDA_AF;
  HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);
    
  /* I2C RX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = I2Cx_SDA_PIN;
  GPIO_InitStruct.Alternate = I2Cx_SCL_SDA_AF;
  HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);
    
  /*##-4- Configure the DMA Channels #########################################*/
  /* Configure the DMA handler for Transmission process */
  hdma_tx.Instance                 = I2Cx_DMA_INSTANCE_TX;
  hdma_tx.Init.Direction           = DMA_MEMORY_TO_PERIPH;
  hdma_tx.Init.PeriphInc           = DMA_PINC_DISABLE;
  hdma_tx.Init.MemInc              = DMA_MINC_ENABLE;
  hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
  hdma_tx.Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
  hdma_tx.Init.Mode                = DMA_NORMAL;
  hdma_tx.Init.Priority            = DMA_PRIORITY_LOW;

  HAL_DMA_Init(&hdma_tx);   
  
  /* Associate the initialized DMA handle to the the I2C handle */
  __HAL_LINKDMA(hi2c, hdmatx, hdma_tx);
    
  /* Configure the DMA handler for Transmission process */
  hdma_rx.Instance                 = I2Cx_DMA_INSTANCE_RX;
  hdma_rx.Init.Direction           = DMA_PERIPH_TO_MEMORY;
  hdma_rx.Init.PeriphInc           = DMA_PINC_DISABLE;
  hdma_rx.Init.MemInc              = DMA_MINC_ENABLE;
  hdma_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
  hdma_rx.Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
  hdma_rx.Init.Mode                = DMA_NORMAL;
  hdma_rx.Init.Priority            = DMA_PRIORITY_HIGH;

  HAL_DMA_Init(&hdma_rx);
    
  /* Associate the initialized DMA handle to the the I2C handle */
  __HAL_LINKDMA(hi2c, hdmarx, hdma_rx);
    
  /*##-5- Configure the NVIC for DMA #########################################*/
  /* NVIC configuration for DMA transfer complete interrupt (I2Cx_TX and I2Cx_RX) */
  HAL_NVIC_SetPriority(I2Cx_DMA_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(I2Cx_DMA_IRQn);

  /*##-6- Configure the NVIC for I2C ########################################*/   
  /* NVIC for I2Cx */
  HAL_NVIC_SetPriority(I2Cx_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(I2Cx_IRQn);
}

/**
  * @brief I2C MSP De-Initialization 
  *        This function frees the hardware resources used in this example:
  *          - Disable the Peripheral's clock
  *          - Revert GPIO, DMA and NVIC configuration to their default state
  * @param hi2c: I2C handle pointer
  * @retval None
  */
void HAL_I2C_MspDeInit(I2C_HandleTypeDef *hi2c)
{
  
  static DMA_HandleTypeDef hdma_tx;
  static DMA_HandleTypeDef hdma_rx;

  /*##-1- Reset peripherals ##################################################*/
  I2Cx_FORCE_RESET();
  I2Cx_RELEASE_RESET();

  /*##-2- Disable peripherals and GPIO Clocks #################################*/
  /* Configure I2C Tx as alternate function  */
  HAL_GPIO_DeInit(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN);
  /* Configure I2C Rx as alternate function  */
  HAL_GPIO_DeInit(I2Cx_SDA_GPIO_PORT, I2Cx_SDA_PIN);
   
  /*##-3- Disable the DMA Channels ###########################################*/
  /* De-Initialize the DMA Channel associated to transmission process */
  HAL_DMA_DeInit(&hdma_tx); 
  /* De-Initialize the DMA Channel associated to reception process */
  HAL_DMA_DeInit(&hdma_rx);
  
  /*##-4- Disable the NVIC for DMA ###########################################*/
  HAL_NVIC_DisableIRQ(I2Cx_DMA_IRQn);

  /*##-5- Disable the NVIC for I2C ##########################################*/
  HAL_NVIC_DisableIRQ(I2Cx_IRQn);
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

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