通过串口2的dma接收gps信号，由串口1发送到电脑上

狼道 · 发表于 2014-5-1 22:38:45

通过usart2的dma接收gps信息，在通过usart1发送到电脑上！但这段程序，dma不产生中断？我估计是gps的发送时间，或者dma的接收长度有问题！但还是查不出来！ #include "stm32f10x.h" #include "misc.h" #include #include #include "stm32f10x_usart.h" #define dma_len 100 u8 USART2_DMA_Buf1[dma_len]; u8 USART2_DMA_Buf2[dma_len]; typedef enum {BUF_NO1=0,BUF_NO2=1}BUF_NO; BUF_NO Free_Buf_No; bool Buf_Ok; DMA_InitTypeDef DMA_InitStructure; void DMA1_Channel7_IRQHandler(void) { if(DMA_GetITStatus(DMA1_IT_TC7)) { DMA_ClearITPendingBit(DMA1_IT_GL7); GPIO_SetBits(GPIOB,GPIO_Pin_10); if(Free_Buf_No==BUF_NO1) { DMA_InitStructure.DMA_MemoryBaseAddr =(u32)USART2_DMA_Buf1; DMA_Init(DMA1_Channel7,&DMA_InitStructure); Free_Buf_No=BUF_NO2; } else { DMA_InitStructure.DMA_MemoryBaseAddr =(u32)USART2_DMA_Buf2; DMA_Init(DMA1_Channel7,&DMA_InitStructure); Free_Buf_No=BUF_NO1; } Buf_Ok=true; } } void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; GPIO_StructInit(&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin =GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin =GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_Init(GPIOB,&GPIO_InitStructure); } void RCC_Configuration(void) { SystemInit(); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); } void USART2_Configuration(void) { USART_InitTypeDef USART_InitStructure; USART_InitStructure.USART_BaudRate=38400; USART_InitStructure.USART_WordLength=USART_WordLength_8b; USART_InitStructure.USART_StopBits=USART_StopBits_1; USART_InitStructure.USART_Parity=USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx; USART_Init(USART2,&USART_InitStructure); USART_Cmd(USART2,ENABLE); } void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel =DMA1_Channel7_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0; NVIC_InitStructure.NVIC_IRQChannelSubPriority =0; NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE; NVIC_Init(&NVIC_InitStructure); } void USART_Config(void) { USART_InitTypeDef USART_InitStructure; USART_InitStructure.USART_BaudRate =38400; USART_InitStructure.USART_WordLength =USART_WordLength_8b; USART_InitStructure.USART_StopBits =USART_StopBits_1; USART_InitStructure.USART_Parity =USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode =USART_Mode_Tx|USART_Mode_Rx; USART_Init(USART1,&USART_InitStructure); USART_Cmd(USART1,ENABLE); } int fputc(int ch,FILE *f) { if(ch=='\n') { while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET); USART_SendData(USART1,'\r'); } while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET); USART_SendData(USART1,ch); return ch; } void DMA_Configuration(void) { DMA_DeInit(DMA1_Channel7); DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&USART2->DR ; DMA_InitStructure.DMA_MemoryBaseAddr =(u32)USART2_DMA_Buf1; DMA_InitStructure.DMA_DIR =DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize =10; DMA_InitStructure.DMA_PeripheralInc =DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc =DMA_MemoryInc_Enable;