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STM32串口是如何使用DMA双缓冲方式去接收数据的

1122 STM32

问答对人有帮助，内容完整，我也想知道答案 0 STM32串口是如何使用DMA双缓冲方式去接收数据的？ 0
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答案对人有帮助，有参考价值 0 #define IMAGE_BUFFER_SIZE 100 //以字为单位经试验，增大这个数值速度并未提升 u32 Image_Buffer1[IMAGE_BUFFER_SIZE]={0}; u32 Image_Buffer2[IMAGE_BUFFER_SIZE]={0}; //OV2640 JPEG模式接口配置 void OV2640_JpegDcmiInit(void) { DCMI_InitTypeDef DCMI_InitStructure; DMA_InitTypeDef DMA_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; //NVIC /* Configures the DCMI to interface with the OV2640 camera module / / Enable DCMI clock / RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_DCMI, ENABLE); / DCMI configuration / DCMI_InitStructure.DCMI_CaptureMode = DCMI_CaptureMode_Continuous;//单张DCMI_CaptureMode_Continuous; DCMI_InitStructure.DCMI_SynchroMode = DCMI_SynchroMode_Hardware; DCMI_InitStructure.DCMI_PCKPolarity = DCMI_PCKPolarity_Rising;// DCMI_InitStructure.DCMI_VSPolarity = DCMI_VSPolarity_Low; DCMI_InitStructure.DCMI_HSPolarity = DCMI_HSPolarity_Low; DCMI_InitStructure.DCMI_CaptureRate = DCMI_CaptureRate_All_Frame; DCMI_InitStructure.DCMI_ExtendedDataMode = DCMI_ExtendedDataMode_8b; //初始化DCMI DCMI_Init(&DCMI_InitStructure); //使能JPG DCMI_JPEGCmd(ENABLE); / Configures the DMA2 to transfer Data from DCMI / / Enable DMA2 clock / RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); / DMA2 Stream1 Configuration / DMA_DeInit(DMA2_Stream1); DMA_InitStructure.DMA_Channel = DMA_Channel_1; DMA_InitStructure.DMA_PeripheralBaseAddr = DCMI_DR_ADDRESS; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Image_Buffer1;//传输到内部数组 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = IMAGE_BUFFER_SIZE; //以字为单位 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//使能增长模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;//DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; /DMA double buffer mode*///双缓冲区模式 DMA_DoubleBufferModeConfig(DMA2_Stream1,(uint32_t)&Image_Buffer2,DMA_Memory_0);//DMA_Memory_0首先被传输 DMA_DoubleBufferModeCmd(DMA2_Stream1,ENABLE); DMA_Init(DMA2_Stream1, &DMA_InitStructure); //初始化DMA Dma_FreeBuf_Ok = 0;//此时没有数据准备完成 // DMA_Cmd(DMA2_Stream1,ENABLE);//启动DMA2_Stream1 //中断使能 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); NVIC_InitStructure.NVIC_IRQChannel = DCMI_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); DCMI_ITConfig(DCMI_IT_FRAME,ENABLE); //中断使能 NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); DMA_ITConfig(DMA2_Stream1,DMA_IT_TC,ENABLE); } //DMA传输完成中断 void DMA2_Stream1_IRQHandler(void) { DMA_InitTypeDef DMA_InitStructure; if(DMA_GetITStatus(DMA2_Stream1,DMA_IT_TCIF1) != RESET) { DMA_ClearITPendingBit(DMA2_Stream1,DMA_IT_TCIF1); Dma_FreeBuf_Ok = 1;//有准备好的数据了 } } //主循环 while(1) { //uip_polling(); if(Dma_FreeBuf_Ok == 1)//DMA有空闲缓冲区了 { usart_sendJPEGdata(); Dma_FreeBuf_Ok = 0; } //串口传输 void usart_sendJPEGdata(void) { u32 i; if(DMA_GetCurrentMemoryTarget(DMA2_Stream1) == 1) { for(i=0;i { USART_SendData(USART2,Image_Buffer1); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); USART_SendData(USART2,Image_Buffer1>>8); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); USART_SendData(USART2,Image_Buffer1>>16); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); USART_SendData(USART2,Image_Buffer1>>24); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); } } else { for(i=0;i { USART_SendData(USART2,Image_Buffer2); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); USART_SendData(USART2,Image_Buffer2>>8); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); USART_SendData(USART2,Image_Buffer2>>16); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); USART_SendData(USART2,Image_Buffer2>>24); while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET); } } }

2021-12-7 15:13:51 评论举报李艳玮