stm32l152d_eval_sram.c

/**
  ******************************************************************************
  * @file    stm32l152d_eval_sram.c
  * @author  MCD Application Team
  * @brief   This file provides a set of functions needed to drive the 
  *          IS61WV51216BLL SRAM memory mounted on STM32L152D-EVAL board.
  @verbatim
  ==============================================================================
                     ##### How to use this driver #####
  ==============================================================================  
  [..] 
   (#) This driver is used to drive the IS61WV102416BLL-10M SRAM external memory mounted
       on STM32L152D-EVAL evaluation board.

   (#) This driver does not need a specific component driver for the SRAM device
       to be included with.

   (#) Initialization steps:
       (++) Initialize the SRAM external memory using the BSP_SRAM_Init() function. This 
            function includes the MSP layer hardware resources initialization and the
            FSMC controller configuration to interface with the external SRAM memory.
  
   (#) SRAM read/write operations
       (++) SRAM external memory can be accessed with read/write operations once it is
            initialized.
            Read/write operation can be performed with AHB access using the functions
            BSP_SRAM_ReadData()/BSP_SRAM_WriteData(), or by DMA transfer using the functions
            BSP_SRAM_ReadData_DMA()/BSP_SRAM_WriteData_DMA().
       (++) The AHB access is performed with 16-bit width transaction, the DMA transfer
            configuration is fixed at single (no burst) halfword transfer 
            (see the SRAM_MspInit() static function).
       (++) User can implement his own functions for read/write access with his desired 
            configurations.
       (++) If interrupt mode is used for DMA transfer, the function BSP_SRAM_DMA_IRQHandler()
            is called in IRQ handler file, to serve the generated interrupt once the DMA 
            transfer is complete.
  @endverbatim
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 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.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l152d_eval_sram.h"

/** @addtogroup BSP
  * @{
  */

/** @addtogroup STM32L152D_EVAL
  * @{
  */ 
  
/** @defgroup STM32L152D_EVAL_SRAM STM32L152D-EVAL SRAM
  * @{
  */ 


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

/** @defgroup STM32L152D_EVAL_SRAM_Private_Variables Private Variables
  * @{
  */       
static SRAM_HandleTypeDef sramHandle;
static FSMC_NORSRAM_TimingTypeDef Timing;

/**
  * @}
  */ 

/* Private function prototypes -----------------------------------------------*/

/** @defgroup STM32L152D_EVAL_SRAM_Private_Functions Private Functions
  * @{
  */ 
static void SRAM_MspInit(void); 

/**
  * @}
  */
   
/* Private functions ---------------------------------------------------------*/
    
/** @defgroup STM32L152D_EVAL_SRAM_Exported_Functions Exported Functions
  * @{
  */
    
/**
  * @brief  Initializes the SRAM device.
  * @retval SRAM status
  */
uint8_t BSP_SRAM_Init(void)
{ 
  sramHandle.Instance  = FSMC_NORSRAM_DEVICE;
  sramHandle.Extended  = FSMC_NORSRAM_EXTENDED_DEVICE;
  
  /* SRAM device configuration */  
  Timing.AddressSetupTime      = 2;
  Timing.AddressHoldTime       = 1;
  Timing.DataSetupTime         = 2;
  Timing.BusTurnAroundDuration = 1;
  Timing.CLKDivision           = 2;
  Timing.DataLatency           = 2;
  Timing.AccessMode            = FSMC_ACCESS_MODE_A;
  
  sramHandle.Init.NSBank             = FSMC_NORSRAM_BANK3;
  sramHandle.Init.DataAddressMux     = FSMC_DATA_ADDRESS_MUX_DISABLE;
  sramHandle.Init.MemoryType         = FSMC_MEMORY_TYPE_SRAM;
  sramHandle.Init.MemoryDataWidth    = SRAM_MEMORY_WIDTH;
  sramHandle.Init.BurstAccessMode    = SRAM_BURSTACCESS;
  sramHandle.Init.WaitSignalPolarity = FSMC_WAIT_SIGNAL_POLARITY_LOW;
  sramHandle.Init.WrapMode           = FSMC_WRAP_MODE_DISABLE;
  sramHandle.Init.WaitSignalActive   = FSMC_WAIT_TIMING_BEFORE_WS;
  sramHandle.Init.WriteOperation     = FSMC_WRITE_OPERATION_ENABLE;
  sramHandle.Init.WaitSignal         = FSMC_WAIT_SIGNAL_DISABLE;
  sramHandle.Init.ExtendedMode       = FSMC_EXTENDED_MODE_DISABLE;
  sramHandle.Init.AsynchronousWait   = FSMC_ASYNCHRONOUS_WAIT_DISABLE;
  sramHandle.Init.WriteBurst         = SRAM_WRITEBURST;
    
  /* SRAM controller initialization */
  SRAM_MspInit();
  if(HAL_SRAM_Init(&sramHandle, &Timing, &Timing) != HAL_OK)
  {
    return SRAM_ERROR;
  }
  else
  {
    return SRAM_OK;
  }
}

/**
  * @brief  Reads an amount of data from the SRAM device in polling mode.
  * @param  uwStartAddress: Read start address
  * @param  pData: Pointer to data to be read
  * @param  uwDataSize: Size of read data from the memory   
  * @retval SRAM status
  */
uint8_t BSP_SRAM_ReadData(uint32_t uwStartAddress, uint16_t *pData, uint32_t uwDataSize)
{ 
  if(HAL_SRAM_Read_16b(&sramHandle, (uint32_t *)uwStartAddress, pData, uwDataSize) != HAL_OK)
  {
    return SRAM_ERROR;
  }
  else
  {
    return SRAM_OK;
  }
}

/**
  * @brief  Reads an amount of data from the SRAM device in DMA mode.
  * @param  uwStartAddress: Read start address
  * @param  pData: Pointer to data to be read
  * @param  uwDataSize: Size of read data from the memory   
  * @retval SRAM status
  */
uint8_t BSP_SRAM_ReadData_DMA(uint32_t uwStartAddress, uint16_t *pData, uint32_t uwDataSize)
{
  if(HAL_SRAM_Read_DMA(&sramHandle, (uint32_t *)uwStartAddress, (uint32_t *)pData, uwDataSize) != HAL_OK)
  {
    return SRAM_ERROR;
  }
  else
  {
    return SRAM_OK;
  }
}

/**
  * @brief  Writes an amount of data from the SRAM device in polling mode.
  * @param  uwStartAddress: Write start address
  * @param  pData: Pointer to data to be written
  * @param  uwDataSize: Size of written data from the memory   
  * @retval SRAM status
  */
uint8_t BSP_SRAM_WriteData(uint32_t uwStartAddress, uint16_t *pData, uint32_t uwDataSize) 
{ 
  if(HAL_SRAM_Write_16b(&sramHandle, (uint32_t *)uwStartAddress, pData, uwDataSize) != HAL_OK)
  {
    return SRAM_ERROR;
  }
  else
  {
    return SRAM_OK;
  }
}

/**
  * @brief  Writes an amount of data from the SRAM device in DMA mode.
  * @param  uwStartAddress: Write start address
  * @param  pData: Pointer to data to be written
  * @param  uwDataSize: Size of written data from the memory   
  * @retval SRAM status
  */
uint8_t BSP_SRAM_WriteData_DMA(uint32_t uwStartAddress, uint16_t *pData, uint32_t uwDataSize) 
{
  if(HAL_SRAM_Write_DMA(&sramHandle, (uint32_t *)uwStartAddress, (uint32_t *)pData, uwDataSize) != HAL_OK)
  {
    return SRAM_ERROR;
  }
  else
  {
    return SRAM_OK;
  } 
}

/**
  * @brief  Handles SRAM DMA transfer interrupt request.
  * @retval None
  */
void BSP_SRAM_DMA_IRQHandler(void)
{
  HAL_DMA_IRQHandler(sramHandle.hdma); 
}

/** @addtogroup STM32L152D_EVAL_SRAM_Private_Functions
  * @{
  */ 

/**
  * @brief  Initializes SRAM MSP.
  * @retval None
  */
static void SRAM_MspInit(void)
{
  static DMA_HandleTypeDef dmaHandle;
  GPIO_InitTypeDef gpioinitstruct;
  SRAM_HandleTypeDef *hsram = &sramHandle;
    
  /* Enable FSMC clock */
  __HAL_RCC_FSMC_CLK_ENABLE();
  
  /* Enable chosen DMAx clock */
  SRAM_DMAx_CLK_ENABLE();

  /* Enable GPIOs clock */
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  
  /* Common GPIO configuration */
  gpioinitstruct.Mode      = GPIO_MODE_AF_PP;
  gpioinitstruct.Pull      = GPIO_PULLUP;
  gpioinitstruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
  gpioinitstruct.Alternate = GPIO_AF12_FSMC;
  
  /* Common GPIO configuration */
  gpioinitstruct.Mode      = GPIO_MODE_AF_PP;
  gpioinitstruct.Pull      = GPIO_PULLUP;
  gpioinitstruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
  gpioinitstruct.Alternate = GPIO_AF12_FSMC;
  
  /* GPIOD configuration */
  gpioinitstruct.Pin   = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_4 |GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_9 |
                         GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
   
  HAL_GPIO_Init(GPIOD, &gpioinitstruct);

  /* GPIOE configuration */  
  gpioinitstruct.Pin   = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_7 | GPIO_PIN_8 | GPIO_PIN_9 | GPIO_PIN_10 |
                         GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | 
                         GPIO_PIN_15;
  HAL_GPIO_Init(GPIOE, &gpioinitstruct);
  
  /* GPIOF configuration */  
  gpioinitstruct.Pin   = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | 
                         GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_12 | GPIO_PIN_13 | 
                         GPIO_PIN_14 | GPIO_PIN_15;
  HAL_GPIO_Init(GPIOF, &gpioinitstruct);
  
  /* GPIOG configuration */  
  gpioinitstruct.Pin   = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | 
                         GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_10;
  HAL_GPIO_Init(GPIOG, &gpioinitstruct);  
  
  /* Configure common DMA parameters */
  dmaHandle.Init.Direction           = DMA_MEMORY_TO_MEMORY;
  dmaHandle.Init.PeriphInc           = DMA_PINC_ENABLE;
  dmaHandle.Init.MemInc              = DMA_MINC_ENABLE;
  dmaHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
  dmaHandle.Init.MemDataAlignment    = DMA_MDATAALIGN_HALFWORD;
  dmaHandle.Init.Mode                = DMA_NORMAL;
  dmaHandle.Init.Priority            = DMA_PRIORITY_HIGH;
  
  dmaHandle.Instance = SRAM_DMAx_CHANNEL;
  
   /* Associate the DMA handle */
  __HAL_LINKDMA(hsram, hdma, dmaHandle);
  
  /* Deinitialize the Stream for new transfer */
  HAL_DMA_DeInit(&dmaHandle);
  
  /* Configure the DMA Stream */
  HAL_DMA_Init(&dmaHandle);
  
  /* NVIC configuration for DMA transfer complete interrupt */
  HAL_NVIC_SetPriority(SRAM_DMAx_IRQn, 5, 0);
  HAL_NVIC_EnableIRQ(SRAM_DMAx_IRQn);   
}

/**
  * @}
  */
  
/**
  * @}
  */  
  
/**
  * @}
  */ 
  
/**
  * @}
  */ 
  
/**
  * @}
  */