Tuesday, April 14, 2020

STM32 Transfer data buffer from FLASH memory to SRAM

#define DMA_INSTANCE               DMA2_Stream0
#define DMA_CHANNEL                DMA_CHANNEL_0
#define DMA_INSTANCE_IRQ           DMA2_Stream0_IRQn
#define DMA_INSTANCE_IRQHANDLER    DMA2_Stream0_IRQHandler

#define BUFFER_SIZE              32

DMA_HandleTypeDef     DmaHandle;

static const uint32_t aSRC_Const_Buffer[BUFFER_SIZE] =
{
  0x01020304, 0x05060708, 0x090A0B0C, 0x0D0E0F10,
  0x11121314, 0x15161718, 0x191A1B1C, 0x1D1E1F20,
  0x21222324, 0x25262728, 0x292A2B2C, 0x2D2E2F30,
  0x31323334, 0x35363738, 0x393A3B3C, 0x3D3E3F40,
  0x41424344, 0x45464748, 0x494A4B4C, 0x4D4E4F50,
  0x51525354, 0x55565758, 0x595A5B5C, 0x5D5E5F60,
  0x61626364, 0x65666768, 0x696A6B6C, 0x6D6E6F70,
  0x71727374, 0x75767778, 0x797A7B7C, 0x7D7E7F80
};

static uint32_t aDST_Buffer[BUFFER_SIZE];

static __IO uint32_t transferErrorDetected;    /* Set to 1 if an error transfer is detected */
static __IO uint32_t transferCompleteDetected; /* Set to 1 if transfer is correctly completed */

/* Private function prototypes -----------------------------------------------*/
static void DMA_Config(void);
void SystemClock_Config(void);
static void Error_Handler(void);
static void TransferComplete(DMA_HandleTypeDef *DmaHandle);
static void TransferError(DMA_HandleTypeDef *DmaHandle);
static void CPU_CACHE_Enable(void);

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* Enable the CPU Cache */
  CPU_CACHE_Enable();

  /* STM32F7xx HAL library initialization:
       - Configure the Flash prefetch
       - Systick timer is configured by default as source of time base, but user
         can eventually implement his proper time base source (a general purpose
         timer for example or other time source), keeping in mind that Time base
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 216 MHz */
  SystemClock_Config();

  /* Initialize LED */
  BSP_LED_Init(LED1);

  /* Set to 1 if an transfer error is detected */
  transferErrorDetected = 0;
  transferCompleteDetected = 0;

  /* Configure and enable the DMA stream for Memory to Memory transfer */
  DMA_Config();

  /* Infinite loop */
  while (1)
  {
    if (transferErrorDetected == 1)
    {
      /* Toggle LED1 with a period of 200 ms */
      BSP_LED_Toggle(LED1);
      HAL_Delay(200);
      transferErrorDetected = 0;
    }
    if (transferCompleteDetected == 1)
    {
      /* Turn LED1 on*/
      BSP_LED_On(LED1);
      transferCompleteDetected = 0;
    }
  }
}

/**
  * @brief  Configure the DMA controller according to the Stream parameters
  *         defined in main.h file
  * @note  This function is used to :
  *        -1- Enable DMA2 clock
  *        -2- Select the DMA functional Parameters
  *        -3- Select the DMA instance to be used for the transfer
  *        -4- Initialize the DMA stream
  *        -5- Select Callbacks functions called after Transfer complete and
               Transfer error interrupt detection
  *        -6- Configure NVIC for DMA transfer complete/error interrupts
  *        -7- Start the DMA transfer using the interrupt mode
  * @param  None
  * @retval None
  */
static void DMA_Config(void)
{
  /*## -1- Enable DMA2 clock #################################################*/
  __HAL_RCC_DMA2_CLK_ENABLE();

  /*##-2- Select the DMA functional Parameters ###############################*/
  DmaHandle.Init.Channel = DMA_CHANNEL;                     /* DMA_CHANNEL_0                    */
  DmaHandle.Init.Direction = DMA_MEMORY_TO_MEMORY;          /* M2M transfer mode                */
  DmaHandle.Init.PeriphInc = DMA_PINC_ENABLE;               /* Peripheral increment mode Enable */
  DmaHandle.Init.MemInc = DMA_MINC_ENABLE;                  /* Memory increment mode Enable     */
  DmaHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD; /* Peripheral data alignment : Word */
  DmaHandle.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;    /* memory data alignment : Word     */
  DmaHandle.Init.Mode = DMA_NORMAL;                         /* Normal DMA mode                  */
  DmaHandle.Init.Priority = DMA_PRIORITY_HIGH;              /* priority level : high            */
  DmaHandle.Init.FIFOMode = DMA_FIFOMODE_ENABLE;            /* FIFO mode enabled                */
  DmaHandle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_1QUARTERFULL; /* FIFO threshold: 1/4 full   */
  DmaHandle.Init.MemBurst = DMA_MBURST_SINGLE;              /* Memory burst                     */
  DmaHandle.Init.PeriphBurst = DMA_PBURST_SINGLE;           /* Peripheral burst                 */

  /*##-3- Select the DMA instance to be used for the transfer : DMA2_Stream0 #*/
  DmaHandle.Instance = DMA_INSTANCE;

  /*##-4- Initialize the DMA stream ##########################################*/
  if (HAL_DMA_Init(&DmaHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-5- Select Callbacks functions called after Transfer complete and Transfer error */
  HAL_DMA_RegisterCallback(&DmaHandle, HAL_DMA_XFER_CPLT_CB_ID, TransferComplete);
  HAL_DMA_RegisterCallback(&DmaHandle, HAL_DMA_XFER_ERROR_CB_ID, TransferError);
 
  /*##-6- Configure NVIC for DMA transfer complete/error interrupts ##########*/
  /* Set Interrupt Group Priority */
  HAL_NVIC_SetPriority(DMA_INSTANCE_IRQ, 0, 0);

  /* Enable the DMA STREAM global Interrupt */
  HAL_NVIC_EnableIRQ(DMA_INSTANCE_IRQ);

  /*##-7- Start the DMA transfer using the interrupt mode ####################*/
  /* Configure the source, destination and buffer size DMA fields and Start DMA Stream transfer */
  /* Enable All the DMA interrupts */
  if (HAL_DMA_Start_IT(&DmaHandle, (uint32_t)&aSRC_Const_Buffer, (uint32_t)&aDST_Buffer, BUFFER_SIZE) != HAL_OK)
  {
    /* Transfer Error */
    Error_Handler();
  }
}

/**
  * @brief  DMA conversion complete callback
  * @note   This function is executed when the transfer complete interrupt
  *         is generated
  * @retval None
  */
static void TransferComplete(DMA_HandleTypeDef *DmaHandle)
{
  transferCompleteDetected = 1;
}

/**
  * @brief  DMA conversion error callback
  * @note   This function is executed when the transfer error interrupt
  *         is generated during DMA transfer
  * @retval None
  */
static void TransferError(DMA_HandleTypeDef *DmaHandle)
{
  transferErrorDetected = 1;
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow :
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 216000000
  *            HCLK(Hz)                       = 216000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 4
  *            APB2 Prescaler                 = 2
  *            HSE Frequency(Hz)              = 25000000
  *            PLL_M                          = 25
  *            PLL_N                          = 432
  *            PLL_P                          = 2
  *            PLL_Q                          = 9
  *            VDD(V)                         = 3.3
  *            Main regulator output voltage  = Scale1 mode
  *            Flash Latency(WS)              = 7
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  HAL_StatusTypeDef ret = HAL_OK;

  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 25;
  RCC_OscInitStruct.PLL.PLLN = 432;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 9;
 
  ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }
 
  /* Activate the OverDrive to reach the 216 MHz Frequency */ 
  ret = HAL_PWREx_EnableOverDrive();
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }
 
  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; 
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
 
  ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
  if(ret != HAL_OK)
  {
    while(1) { ; }
  } 
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  while (1)
  {
    /* Toggle LED1 with a period of 1 s */
    BSP_LED_Toggle(LED1);
    HAL_Delay(1000);
  }
}

/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}

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