/** ****************************************************************** * @file main.c * @author fire * @version V1.0 * @date 2019-xx-xx * @brief DMA实验 ****************************************************************** * @attention * * 实验平台:野火 STM32H750 开发板 * 论坛 :http://www.firebbs.cn * 淘宝 :http://firestm32.taobao.com * ****************************************************************** */ #include "stm32h7xx.h" #include "main.h" #include "./led/bsp_led.h" #include "./delay/core_delay.h" /* 相关宏定义，使用存储器到存储器传输必须使用DMA2 */ MDMA_HandleTypeDef MDMA_Handle; #define MDMA_INSTANCE MDMA_Channel0 #define DMA_STREAM_CLOCK() __HAL_RCC_MDMA_CLK_ENABLE(); #define BUFFER_SIZE 32 __IO uint32_t TransferCompleted = 0; /* 定义aSRC_Const_Buffer数组作为DMA传输数据源 const关键字将aSRC_Const_Buffer数组变量定义为常量类型 */ static const uint32_t SRC_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 }; /* 定义DMA传输目标存储器AXISRAM */ __attribute__((at(0x24004000))) uint32_t DESTBuffer[BUFFER_SIZE]; static void MDMA_Config(void); static void Delay(__IO uint32_t nCount); static void SystemClock_Config(void); uint8_t Buffercmp(const uint32_t* pBuffer, uint32_t* pBuffer1, uint16_t BufferLength); static void MDMA_TransferCompleteCallback(MDMA_HandleTypeDef *hmdma); /** * @brief 主函数 * @param 无 * @retval 无 */ int main(void) { /* 定义存放比较结果变量 */ uint8_t TransferStatus; /* 系统时钟初始化成480 MHz */ SystemClock_Config(); /* 默认不配置 MPU，若需要更高性能，当配置 MPU 后，使用 DMA 时需注意 Cache 与 内存内容一致性的问题， 具体注意事项请参考配套教程的 MPU 配置相关章节 */ // Board_MPU_Config(0, MPU_Normal_WT, 0xD0000000, MPU_32MB); // Board_MPU_Config(1, MPU_Normal_WT, 0x24000000, MPU_512KB); SCB_EnableICache(); // 使能指令 Cache // SCB_EnableDCache(); // 使能数据 Cache /* LED 端口初始化 */ LED_GPIO_Config(); /* 设置RGB彩色灯为紫色 */ LED_PURPLE; /* 简单延时函数 */ Delay(0xFFFFFF); /* DMA传输配置 */ MDMA_Config(); /* 等待DMA传输完成 */ while(TransferCompleted == 0) { } /* 比较源数据与传输后数据 */ TransferStatus=Buffercmp(SRC_Const_Buffer, DESTBuffer, BUFFER_SIZE); /* 判断源数据与传输后数据比较结果*/ if(TransferStatus==0) { /* 源数据与传输后数据不相等时RGB彩色灯显示红色 */ LED_RED; } else { /* 源数据与传输后数据相等时RGB彩色灯显示蓝色 */ LED_BLUE; } while (1) { } } /* 简单的延时函数 */ static void Delay(__IO uint32_t nCount) { for(; nCount != 0; nCount--); } /** * DMA传输配置 */ static void MDMA_Config(void) { HAL_StatusTypeDef DMA_status = HAL_ERROR; /* 使能MDMA时钟 */ DMA_STREAM_CLOCK(); //MDMA外设寄存器基地址——通道0 MDMA_Handle.Instance = MDMA_INSTANCE; //软件触发MDMA采集 MDMA_Handle.Init.Request = MDMA_REQUEST_SW; MDMA_Handle.Init.TransferTriggerMode = MDMA_FULL_TRANSFER; //MDMA的软件优先级：低 MDMA_Handle.Init.Priority = MDMA_PRIORITY_HIGH; MDMA_Handle.Init.Endianness = MDMA_LITTLE_ENDIANNESS_PRESERVE; //源地址地址自增，长度为字 MDMA_Handle.Init.SourceInc = MDMA_SRC_INC_WORD; //目标地址地址自增，长度为字节 MDMA_Handle.Init.DestinationInc = MDMA_DEST_INC_BYTE; //源地址数据宽度：字 MDMA_Handle.Init.SourceDataSize = MDMA_SRC_DATASIZE_WORD; //目标地址数据宽度：字节 MDMA_Handle.Init.DestDataSize = MDMA_DEST_DATASIZE_BYTE; //数据对齐格式：右对齐（小端模式） MDMA_Handle.Init.DataAlignment = MDMA_DATAALIGN_PACKENABLE; //源地址地址不自增 MDMA_Handle.Init.SourceBurst = MDMA_SOURCE_BURST_SINGLE; //目标地址地址不自增 MDMA_Handle.Init.DestBurst = MDMA_DEST_BURST_SINGLE; MDMA_Handle.Init.BufferTransferLength = 4; MDMA_Handle.Init.SourceBlockAddressOffset = 0; MDMA_Handle.Init.DestBlockAddressOffset = 0; HAL_MDMA_Init(&MDMA_Handle); HAL_MDMA_RegisterCallback(&MDMA_Handle, HAL_MDMA_XFER_CPLT_CB_ID, MDMA_TransferCompleteCallback); /* Set Interrupt Group Priority */ HAL_NVIC_SetPriority(MDMA_IRQn, 0, 0); /* Enable the MDMA channel global Interrupt */ HAL_NVIC_EnableIRQ(MDMA_IRQn); DMA_status = HAL_MDMA_Start_IT(&MDMA_Handle, (uint32_t)&SRC_Const_Buffer, (uint32_t)&DESTBuffer, (BUFFER_SIZE * 4), 1); /* 判断DMA状态 */ if (DMA_status != HAL_OK) { /* DMA出错就让程序运行下面循环：RGB彩色灯闪烁 */ while (1) { LED_RED; Delay(0xFFFFFF); LED_RGBOFF; Delay(0xFFFFFF); } } } /** * 判断指定长度的两个数据源是否完全相等， * 如果完全相等返回1，只要其中一对数据不相等返回0 */ uint8_t Buffercmp(const uint32_t* pBuffer, uint32_t* pBuffer1, uint16_t BufferLength) { /* 数据长度递减 */ while(BufferLength--) { /* 判断两个数据源是否对应相等 */ if(*pBuffer != *pBuffer1) { /* 对应数据源不相等马上退出函数，并返回0 */ return 0; } /* 递增两个数据源的地址指针 */ pBuffer++; pBuffer1++; } /* 完成判断并且对应数据相对 */ return 1; } /** * @brief MDMA conversion complete callback * @note This function is executed when the transfer complete interrupt * is generated * @retval None */ static void MDMA_TransferCompleteCallback(MDMA_HandleTypeDef *hmdma) { TransferCompleted = 1; } /** * @brief System Clock 配置 * system Clock 配置如下: * System Clock source = PLL (HSE) * SYSCLK(Hz) = 480000000 (CPU Clock) * HCLK(Hz) = 240000000 (AXI and AHBs Clock) * AHB Prescaler = 2 * D1 APB3 Prescaler = 2 (APB3 Clock 120MHz) * D2 APB1 Prescaler = 2 (APB1 Clock 120MHz) * D2 APB2 Prescaler = 2 (APB2 Clock 120MHz) * D3 APB4 Prescaler = 2 (APB4 Clock 120MHz) * HSE Frequency(Hz) = 25000000 * PLL_M = 5 * PLL_N = 192 * PLL_P = 2 * PLL_Q = 4 * PLL_R = 2 * VDD(V) = 3.3 * Flash Latency(WS) = 4 * @param None * @retval None */ /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** 启用电源配置更新 */ HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY); /** 配置主内稳压器输出电压 */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0); while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {} /** 初始化CPU、AHB和APB总线时钟 */ 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 = 5; RCC_OscInitStruct.PLL.PLLN = 192; RCC_OscInitStruct.PLL.PLLP = 2; RCC_OscInitStruct.PLL.PLLQ = 2; RCC_OscInitStruct.PLL.PLLR = 2; RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_2; RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE; RCC_OscInitStruct.PLL.PLLFRACN = 0; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { while(1); } /** 初始化CPU、AHB和APB总线时钟 */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2 |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2; RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2; RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) { while(1); } } /****************************END OF FILE***************************/