/**
  ******************************************************************************
  * @file    I2C/I2C_TwoBoards_ComDMA/Src/stm32f1xxhal_msp.c
  * @author  MCD Application Team
  * @version V1.5.0
  * @date    14-April-2017
  * @brief   HAL MSP module.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 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 STM32F1xx_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;
  
  /*##-1- 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();
  
  /* Force the I2C Periheral Clock Reset */  
  I2Cx_FORCE_RESET(); 
  /* Release the I2C Periheral Clock Reset */  
  I2Cx_RELEASE_RESET(); 

  /* Enable DMAx clock */
  I2Cx_DMA_CLK_ENABLE();   
  
  /*##-2- 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;
  HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);
    
  /* I2C RX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = I2Cx_SDA_PIN;
  HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);
    
  /*##-3- 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);
    
  /*##-4- Configure the NVIC for DMA #########################################*/
  /* NVIC configuration for DMA transfer complete interrupt (I2Cx_TX) */
  HAL_NVIC_SetPriority(I2Cx_DMA_TX_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(I2Cx_DMA_TX_IRQn);
    
  /* NVIC configuration for DMA transfer complete interrupt (I2Cx_RX) */
  HAL_NVIC_SetPriority(I2Cx_DMA_RX_IRQn, 0, 0);   
  HAL_NVIC_EnableIRQ(I2Cx_DMA_RX_IRQn);
  
  /*##-5- Configure the NVIC for I2C #########################################*/   
  /* NVIC for I2C1 */
  HAL_NVIC_SetPriority(I2Cx_ER_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(I2Cx_ER_IRQn);
  HAL_NVIC_SetPriority(I2Cx_EV_IRQn, 0, 2);
  HAL_NVIC_EnableIRQ(I2Cx_EV_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_TX_IRQn);
  HAL_NVIC_DisableIRQ(I2Cx_DMA_RX_IRQn);
  
  /*##-5- Disable the NVIC for I2C ###########################################*/
  HAL_NVIC_DisableIRQ(I2Cx_ER_IRQn);
  HAL_NVIC_DisableIRQ(I2Cx_EV_IRQn);
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

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