STM32F407 USART +DMA共思路DMA通道,进行数据转发.doc

/* * * file IO_Toggle/main.c * author MCD Application Team * version V1.0.0 * date 19-September-2011 * brief Main program body * * attention * * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. * * © COPYRIGHT 2011 STMicroelectronics * */ /* Includes -*/ #include stm32f4xx.h /串口1连接电脑的USB-TTL小板子，串口2连接MAX485 /* Private typedef -*/ #define TX_MODE 0 #define RX_MODE 1 unsigned long boundrate7=600,2400,4800,9600,19200,38400,57600;/* Private variables -*/_IO unsigned char uart_rx_tx_buf2; USART_InitTypeDef USART_InitStruct; DMA_InitTypeDef DMA_InitStruct; GPIO_InitTypeDef GPIO_InitStruct;NVIC_InitTypeDef NVIC_InitStructure;/* Private function prototypes -*/* Private functions -*/* * brief Main program * param None * retval None */void uart_1_dma_init(void);void uart_2_dma_init(void);void Set485Mode(unsigned char flag); void Set_1_rate(unsigned char rate_num); void Set_2_rate(unsigned char rate_num); void _485PinConfig(void);int main(void)uart_1_dma_init();uart_2_dma_init();Set485Mode(TX_MODE);while(1);void uart_1_dma_init(void) /* Enable uart1, DMA2 and GPIO clocks */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOB, ENABLE); /B6-TX, B7-RX;RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);/*uart1 initial*/USART_InitStruct.USART_BaudRate=9600;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Rx |USART_Mode_Tx;USART_InitStruct.USART_Parity=USART_Parity_No;USART_InitStruct.USART_StopBits=USART_StopBits_1;USART_InitStruct.USART_WordLength=USART_WordLength_8b;USART_Init(USART1,&USART_InitStruct);/*GPIO*/GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_USART1);GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_USART1);GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6 |GPIO_Pin_7;GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStruct); /* DMA2 Stream0 channel0 configuration */ DMA_InitStruct.DMA_Channel = DMA_Channel_4; DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART1-DR); DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf; DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStruct.DMA_BufferSize = 2; DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStruct.DMA_Mode = DMA_Mode_Circular; DMA_InitStruct.DMA_Priority = DMA_Priority_High; DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA2_Stream2, &DMA_InitStruct); DMA_InitStruct.DMA_Channel = DMA_Channel_4; DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART1-DR); DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf; DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral; DMA_InitStruct.DMA_BufferSize = 2; DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStruct.DMA_Mode = DMA_Mode_Circular; DMA_InitStruct.DMA_Priority = DMA_Priority_High; DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA2_Stream7, &DMA_InitStruct);/*DMA interrupt*/DMA_ITConfig(DMA2_Stream7,DMA_IT_TC,ENABLE);DMA_ITConfig(DMA2_Stream2,DMA_IT_TC,ENABLE);NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream7_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x00;NVIC_Init(&NVIC_InitStructure);NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream2_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00;NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01;NVIC_Init(&NVIC_InitStructure);/*start*/ DMA_Cmd(DMA2_Stream7, DISABLE); /不使能DMA对于USART1的发送功能DMA_Cmd(DMA2_Stream2, ENABLE); /使能DMA对于USART1的接收功能USART_DMACmd(USART1,USART_DMAReq_Rx |USART_DMAReq_Tx,ENABLE);USART_Cmd(USART1,ENABLE);void uart_2_dma_init(void) /* Enable uart1, DMA2 and GPIO clocks */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA, ENABLE); / A2-TX,A3-RXRCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);/*uart1 initial*/USART_InitStruct.USART_BaudRate=9600;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Rx |USART_Mode_Tx;USART_InitStruct.USART_Parity=USART_Parity_No;USART_InitStruct.USART_StopBits=USART_StopBits_1;USART_InitStruct.USART_WordLength=USART_WordLength_8b;USART_Init(USART2,&USART_InitStruct);/*GPIO*/GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;GPIO_InitStruct.GPIO_Pin=GPIO_Pin_2 |GPIO_Pin_3;GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStruct);GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); /* DMA2 Stream0 channel0 configuration */ DMA_InitStruct.DMA_Channel = DMA_Channel_4; DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART2-DR); DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf; DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral; DMA_InitStruct.DMA_BufferSize = 2; DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStruct.DMA_Mode = DMA_Mode_Circular; DMA_InitStruct.DMA_Priority = DMA_Priority_High; DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA1_Stream6, &DMA_InitStruct); DMA_InitStruct.DMA_Channel = DMA_Channel_4; DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)(&(USART2-DR); DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)uart_rx_tx_buf; DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStruct.DMA_BufferSize = 2; DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStruct.DMA_Mode = DMA_Mode_Circular; DMA_InitStruct.DMA_Priority = DMA_Priority_High; DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA1_Stream5, &DMA_InitStruct);/*DMA interrupt*/DMA_ITConfig(DMA1_Stream5,DMA_IT_TC,ENABLE);DMA_ITConfig(DMA1_Stream6,DMA_IT_TC,ENABLE);NVIC_InitStructure.NVIC_IRQChannel=DMA1_Stream5_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x00;NVIC_Init(&NVIC_InitStructure);NVIC_InitStructure.NVIC_IRQChannel=DMA1_Stream6_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01;NVIC_Init(&NVIC_InitStructure);/*start*/ DMA_Cmd(DMA1_Stream5, ENABLE); /使能USART2的串口接收DMADMA_Cmd(DMA1_Stream6, DISABLE); /不使能USART2的串口发送DMAUSART_DMACmd(USART2,USART_DMAReq_Rx |USART_DMAReq_Tx,ENABLE);USART_Cmd(USART2,ENABLE);void DMA2_Stream2_IRQHandler(void) /串口1接收到了数据。即：电脑发数据了if(DMA_GetITStatus(DMA2_Stream2,DMA_IT_TCIF2)=SET)DMA_ClearFlag(DMA2_Stream2,DMA_FLAG_TCIF2);if(uart_rx_tx_buf0=C)Set_1_rate(uart_rx_tx_buf1);DMA_Cmd(DMA1_Stream6, ENABLE); /使能USART2的串口发送DMAvoid DMA2_Stream7_IRQHandler(void)if(DMA_GetITStatus(DMA2_Stream7,DMA_IT_TCIF7)=SET) /串口1发送完数据DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7);DMA_Cmd(DMA2_Stream7, DISABLE); /不使能DMA对于USART1的发送功能void DMA1_Stream5_IRQHandler(void) /串口2接收数据完成,即：8051向串口2发送数据if(DMA_GetITStatus(DMA1_Stream5,DMA_IT_TCIF5)=SET)DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);DMA_Cmd(DMA2_Stream7, ENABLE); /使能DMA对于USART1的发送功能void DMA1_Stream6_IRQHandler(void) /串口2发送数据完成,即：发送到8051if(DMA_GetITStatus(DMA1_Stream6,DMA_IT_TCIF6)=SET)DMA_ClearFlag(DMA1_Stream6,DMA_FLAG_TCIF6);if(uart_rx_tx_buf0=C)Set_2_rate(uart_rx_tx_buf1);else if(uart_rx_tx_buf0=R &uart_rx_tx_buf1=D)Set485Mode(RX_MODE);DMA_Cmd(DMA1_Stream6, DISABLE); /关闭USART2的串口发送DMAvoid Set_1_rate(unsigned char rate_num)USART_InitStruct.USART_BaudRate=boundraterate_num;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Rx |USART_Mode_Tx;USART_InitStruct.USART_Parity=USART_Parity_No;USART_InitStruct.USART_StopBits=USART_StopBits_1;USART_InitStruct.USART_WordLength=USART_WordLength_8b;USART_Init(USART1,&USART_InitStruct); void Set_2_rate(unsigned char rate_num)USART_InitStruct.USART_BaudRate=boundraterate_num;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Rx |USART_Mod