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/**
******************************************************************************
* @file Examples_LL/DMA/DMA_CopyFromFlashToMemory/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use a DMA channel to transfer
* a word data buffer from FLASH memory to embedded SRAM memory
* through the STM32F4xx DMA LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @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 "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup DMA_CopyFromFlashToMemory
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BUFFER_SIZE 32
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
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];
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_DMA(void);
uint8_t Buffercmp(uint32_t* pBuffer1, uint32_t* pBuffer2, uint32_t BufferLength);
void LED_Init(void);
void LED_On(void);
void LED_Blinking(uint32_t Period);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Configure DMA2 Stream 0 */
/* Enable DMA2 clock */
/* Configure the DMA functional parameters : */
/* - Transfer memory word to memory word in normal mode */
/* - Memory and Periph increment mode */
/* Configure NVIC for DMA transfer complete/error interrupts */
Configure_DMA();
/* Start the DMA transfer Flash to Memory */
LL_DMA_EnableStream(DMA2, LL_DMA_STREAM_0);
/* Infinite loop */
while (1)
{
/* Transfer completion and comparison is done on interrupt callback directly */
}
}
/**
* @brief This function configures the DMA2 Stream 0 to copy data from
* Flash memory(aSRC_Const_Buffer) to Internal SRAM(aDST_Buffer).
* @note This function is used to :
* -1- Enable DMA2 clock
* -2- Configure the DMA functional parameters
* -3- Configure NVIC for DMA transfer complete/error interrupts
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_DMA(void)
{
/* (1) Enable the clock of DMA2 */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA2);
/* (2) Configure the DMA functional parameters */
/* Configuration of the DMA parameters can be done using unitary functions or using the specific configure function */
/* Unitary Functions */
LL_DMA_SetDataTransferDirection(DMA2, LL_DMA_STREAM_0, LL_DMA_DIRECTION_MEMORY_TO_MEMORY);
LL_DMA_SetStreamPriorityLevel(DMA2, LL_DMA_STREAM_0, LL_DMA_PRIORITY_HIGH);
LL_DMA_SetMode(DMA2, LL_DMA_STREAM_0, LL_DMA_MODE_NORMAL);
LL_DMA_SetPeriphIncMode(DMA2, LL_DMA_STREAM_0, LL_DMA_PERIPH_INCREMENT);
LL_DMA_SetMemoryIncMode(DMA2, LL_DMA_STREAM_0, LL_DMA_MEMORY_INCREMENT);
LL_DMA_SetPeriphSize(DMA2, LL_DMA_STREAM_0, LL_DMA_PDATAALIGN_WORD);
LL_DMA_SetMemorySize(DMA2, LL_DMA_STREAM_0, LL_DMA_MDATAALIGN_WORD);
/* Configure Function */
// LL_DMA_ConfigTransfer(DMA2, LL_DMA_STREAM_0, LL_DMA_DIRECTION_MEMORY_TO_MEMORY |
// LL_DMA_PRIORITY_HIGH |
// LL_DMA_MODE_NORMAL |
// LL_DMA_PERIPH_INCREMENT |
// LL_DMA_MEMORY_INCREMENT |
// LL_DMA_PDATAALIGN_WORD |
// LL_DMA_MDATAALIGN_WORD);
LL_DMA_SetDataLength(DMA2, LL_DMA_STREAM_0, BUFFER_SIZE);
LL_DMA_ConfigAddresses(DMA2, LL_DMA_STREAM_0, (uint32_t)&aSRC_Const_Buffer, (uint32_t)&aDST_Buffer, LL_DMA_GetDataTransferDirection(DMA2, LL_DMA_STREAM_0));
/* (3) Configure NVIC for DMA transfer complete/error interrupts */
LL_DMA_EnableIT_TC(DMA2, LL_DMA_STREAM_0);
LL_DMA_EnableIT_TE(DMA2, LL_DMA_STREAM_0);
NVIC_SetPriority(DMA2_Stream0_IRQn, 0);
NVIC_EnableIRQ(DMA2_Stream0_IRQn);
}
/**
* @brief Compares two buffers.
* @param pBuffer1, pBuffer2: buffers to be compared.
* @param BufferLength: buffer's length
* @retval 0: pBuffer identical to pBuffer1
* 1: pBuffer differs from pBuffer1
*/
uint8_t Buffercmp(uint32_t* pBuffer1, uint32_t* pBuffer2, uint32_t BufferLength)
{
while (BufferLength--)
{
if (*pBuffer1 != *pBuffer2)
{
return 1;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
}
/**
* @brief Turn-on LED2.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(Period);
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief DMA transfer complete callback
* @note This function is executed when the transfer complete interrupt
* is generated
* @retval None
*/
void TransferComplete()
{
/* DMA transfer completed */
/* Verify the data transferred */
if (Buffercmp((uint32_t*)aSRC_Const_Buffer, (uint32_t*)aDST_Buffer, BUFFER_SIZE) == 1)
{
/* DMA data transferred not consistency */
LED_Blinking(LED_BLINK_ERROR);
}
/* DMA data transferred consistency */
LED_On();
}
/**
* @brief DMA transfer error callback
* @note This function is executed when the transfer error interrupt
* is generated during DMA transfer
* @retval None
*/
void TransferError()
{
/* Error detected during DMA transfer */
LED_Blinking(LED_BLINK_ERROR);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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