/**
  ******************************************************************************
  * @file    BSP/Src/sram.c 
  * @author  MCD Application Team
  * @brief   This example code shows how to use the SRAM Driver
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 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 STM32F4xx_HAL_Examples
  * @{
  */

/** @addtogroup BSP
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BUFFER_SIZE         ((uint32_t)0x0100)
#define WRITE_READ_ADDR     ((uint32_t)0x0800)
    
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint16_t sram_aTxBuffer[BUFFER_SIZE];
uint16_t sram_aRxBuffer[BUFFER_SIZE];
uint8_t ubSramWrite = 0, ubSramRead = 0, ubSramInit = 0;

/* Private function prototypes -----------------------------------------------*/
static void SRAM_SetHint(void);
static void Fill_Buffer(uint16_t *pBuffer, uint32_t uwBufferLenght, uint32_t uwOffset);
static uint8_t Buffercmp(uint16_t* pBuffer1, uint16_t* pBuffer2, uint16_t BufferLength);

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

/**
  * @brief  SRAM Demo
  * @param  None
  * @retval None
  */
void SRAM_demo(void)
{ 
  SRAM_SetHint();
  
  /* STM32F427x/437x/429x/439x "Revision 3" devices: FMC dynamic and static 
     bank switching is allowed  */
  if (HAL_GetREVID() >= 0x2000) {}
  else
  {
    /* Disable the LCD to avoid the refresh from the SDRAM */
    BSP_LCD_DisplayOff();
  }

  /*##-1- Configure the SRAM device ##########################################*/
  /* SRAM device configuration */ 
  if(BSP_SRAM_Init() != SRAM_OK)
  {
    ubSramInit++;
  }
  
  /*##-2- SRAM memory read/write access ######################################*/  
  /* Fill the buffer to write */
  Fill_Buffer(sram_aTxBuffer, BUFFER_SIZE, 0xC20F);   
  
  /* Write data to the SRAM memory */
  if(BSP_SRAM_WriteData(SRAM_DEVICE_ADDR + WRITE_READ_ADDR, sram_aTxBuffer, BUFFER_SIZE) != SRAM_OK)
  {
    ubSramWrite++;
  }   
  
  /* Read back data from the SRAM memory */
  if(BSP_SRAM_ReadData(SRAM_DEVICE_ADDR + WRITE_READ_ADDR, sram_aRxBuffer, BUFFER_SIZE) != SRAM_OK)
  {
    ubSramRead++;
  }  
  
  /*##-3- Checking data integrity ############################################*/
  /* STM32F427x/437x/429x/439x "Revision 3" devices: FMC dynamic and static 
     bank switching is allowed  */
  if (HAL_GetREVID() >= 0x2000) {}
  else
  {
    /* Enable the LCD */
    BSP_LCD_DisplayOn();  
    
    /* SDRAM initialization */
    BSP_SDRAM_Init();
  }

  if(ubSramInit != 0)
  {
    BSP_LCD_DisplayStringAt(20, 100, (uint8_t *)"SRAM Initialization : FAILED.", LEFT_MODE);
    BSP_LCD_DisplayStringAt(20, 115, (uint8_t *)"SRAM Test Aborted.", LEFT_MODE);
  }
  else
  {
    BSP_LCD_DisplayStringAt(20, 100, (uint8_t *)"SRAM Initialization : OK.", LEFT_MODE);
  }
  if(ubSramWrite != 0)
  {
    BSP_LCD_DisplayStringAt(20, 115, (uint8_t *)"SRAM WRITE : FAILED.", LEFT_MODE);
    BSP_LCD_DisplayStringAt(20, 130, (uint8_t *)"SRAM Test Aborted.", LEFT_MODE);
  }
  else
  {
    BSP_LCD_DisplayStringAt(20, 115, (uint8_t *)"SRAM WRITE : OK.", LEFT_MODE);
  }
  if(ubSramRead != 0)
  {
    BSP_LCD_DisplayStringAt(20, 130, (uint8_t *)"SRAM READ : FAILED.", LEFT_MODE);
    BSP_LCD_DisplayStringAt(20, 145, (uint8_t *)"SRAM Test Aborted.", LEFT_MODE);
  }
  else
  {
    BSP_LCD_DisplayStringAt(20, 130, (uint8_t *)"SRAM READ : OK.", LEFT_MODE);
  }
  
  if(Buffercmp(sram_aRxBuffer, sram_aTxBuffer, BUFFER_SIZE) > 0)
  {
    BSP_LCD_DisplayStringAt(20, 145, (uint8_t *)"SRAM COMPARE : FAILED.", LEFT_MODE);
    BSP_LCD_DisplayStringAt(20, 160, (uint8_t *)"SRAM Test Aborted.", LEFT_MODE);
  }
  else
  {    
    BSP_LCD_DisplayStringAt(20, 145, (uint8_t *)"SRAM Test : OK.", LEFT_MODE);
  }
  
  while (1)
  {    
    if(CheckForUserInput() > 0)
    {
      return;
    }
  }
}

/**
  * @brief  Display SRAM Demo Hint
  * @param  None
  * @retval None
  */
static void SRAM_SetHint(void)
{
  /* Clear the LCD */ 
  BSP_LCD_Clear(LCD_COLOR_WHITE);
  
  /* Set LCD Demo description */
  BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
  BSP_LCD_FillRect(0, 0, BSP_LCD_GetXSize(), 80);
  BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
  BSP_LCD_SetBackColor(LCD_COLOR_BLUE); 
  BSP_LCD_SetFont(&Font24);
  BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"SRAM", CENTER_MODE);
  BSP_LCD_SetFont(&Font12);
  BSP_LCD_DisplayStringAt(0, 30, (uint8_t *)"This example shows how to write", CENTER_MODE);
  BSP_LCD_DisplayStringAt(0, 45, (uint8_t *)"and read data on the SRAM", CENTER_MODE);
  
  /* Set the LCD Text Color */
  BSP_LCD_SetTextColor(LCD_COLOR_BLUE);  
  BSP_LCD_DrawRect(10, 90, BSP_LCD_GetXSize() - 20, BSP_LCD_GetYSize()- 100);
  BSP_LCD_DrawRect(11, 91, BSP_LCD_GetXSize() - 22, BSP_LCD_GetYSize()- 102);
  
  BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
  BSP_LCD_SetBackColor(LCD_COLOR_WHITE); 
}

/**
  * @brief  Fills buffer with user predefined data.
  * @param  pBuffer: pointer on the buffer to fill
  * @param  uwBufferLenght: size of the buffer to fill
  * @param  uwOffset: first value to fill on the buffer
  * @retval None
  */
static void Fill_Buffer(uint16_t *pBuffer, uint32_t uwBufferLenght, uint32_t uwOffset)
{
  uint32_t tmpIndex = 0;
  
  /* Put in global buffer different values */
  for (tmpIndex = 0; tmpIndex < uwBufferLenght; tmpIndex++ )
  {
    pBuffer[tmpIndex] = tmpIndex + uwOffset;
  }
}

/**
  * @brief  Compares two buffers.
  * @param  pBuffer1, pBuffer2: buffers to be compared.
  * @param  BufferLength: buffer's length
  * @retval 1: pBuffer identical to pBuffer1
  *         0: pBuffer differs from pBuffer1
  */
static uint8_t Buffercmp(uint16_t* pBuffer1, uint16_t* pBuffer2, uint16_t BufferLength)
{
  while (BufferLength--)
  {
    if (*pBuffer1 != *pBuffer2)
    {
      return 1;
    }
    
    pBuffer1++;
    pBuffer2++;
  }
  return 0;
}

/**
  * @}
  */ 

/**
  * @}
  */

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