#include "stm32f4xx.h" // Device header#include "main.h"#include "misc.h"#include "USART_0.h"#include <stdio.h>#include <stdarg.h>
// 全局变量，用于存储USART1接收到的数据volatile uint16_t com1_rx_len = 0; //接收帧数据的长度volatile uint8_t com1_recv_end_flag = 0;//帧数据接收完成标志uint8_t com1_rx_buffer[400]={0}; //接收数据缓存uint8_t DMA_USART1_TX_BUF[400]={0};//DMA发送缓存
#define USART1_TX_MAX_LEN 1024#define USART1_RX_MAX_LEN 1024
void USART0_Init(uint32_t bound) { //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure;
USART_DeInit(USART1); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //使能USART1时钟 //串口1对应引脚复用映射 GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1 GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1 //USART1端口配置 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_9; //GPIOA10与GPIOA9 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉 GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA9，PA10 //USART1 初始化设置 USART_InitStructure.USART_BaudRate = bound; //波特率设置 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式 USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位 USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式 USART_Init(USART1, &USART_InitStructure); //初始化串口1
NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //串口1中断通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2; //抢占优先级2 NVIC_InitStructure.NVIC_IRQChannelSubPriority =1; //子优先级1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器、 NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn; //嵌套通道为DMA2_Stream5_IRQn NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级为 2 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //响应优先级为 2 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能 NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream7_IRQn ;//串口1发送中断通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级2 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE); //开启串口空闲中断 USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE); // 开启串口DMA接收 USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); // 开启串口DMA发送
/* 配置串口DMA接收*/ DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); // 开启DMA时钟 DMA_DeInit(DMA2_Stream5); //设为默认值 DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR; //DMA外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)com1_rx_buffer; //DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //存储器到外设模式 DMA_InitStructure.DMA_BufferSize = USART1_RX_MAX_LEN; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; //高等优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不开启FIFO模式 DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; //FIFO阈值 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输 DMA_Init(DMA2_Stream5, &DMA_InitStructure); DMA_Cmd(DMA2_Stream5, ENABLE); //使能DMA2_Stream5通道
DMA_DeInit(DMA2_Stream7); //初始化DMA Stream while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE);//等待DMA可配置 /* 配置DMA2 Stream7，USART1发送 */ DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1->DR; //DMA外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (u32)DMA_USART1_TX_BUF; //DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //存储器到外设模式 DMA_InitStructure.DMA_BufferSize = USART1_TX_MAX_LEN; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输 DMA_Init(DMA2_Stream7, &DMA_InitStructure); //初始化DMA Stream7
DMA_ITConfig(DMA2_Stream7, DMA_IT_TC, ENABLE); //DMA2传输完成中断 DMA_Cmd(DMA2_Stream7, DISABLE); //不使能 USART_Cmd(USART1, ENABLE); //使能串口1}
void DMA2_Stream7_IRQHandler(void){ //清除标志 if(DMA_GetFlagStatus(DMA2_Stream7,DMA_FLAG_TCIF7)!=RESET)//等待DMA2_Steam7传输完成 { DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7); //清除DMA2_Steam7传输完成标志 DMA_Cmd(DMA2_Stream7,DISABLE); //关闭使能 USART_ITConfig(USART1,USART_IT_TC,ENABLE); //打开串口发送完成中断 }}
void DMA_USART1_Send(u8 *data,u16 size)//函数名称可自定义{ memcpy(DMA_USART1_TX_BUF,data,size); //复制数据到DMA发送缓存区 while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE); //确保DMA可以被设置 DMA_SetCurrDataCounter(DMA2_Stream7,size); //设置数据传输长度 DMA_Cmd(DMA2_Stream7,ENABLE); //打开DMA数据流，开始发送}
以上是USART配置
主函数
int main(void){ /*初始化区域*/ USART0_Init(9600); //设置波特率 USART1_Init(9600); USART2_Init(9600); /*静态配置区域*/ while (1) { u8 DATA[] = {0xAA,0xAB,0XAC}; DMA_USART1_Send(DATA,3); }}
// 全局变量，用于存储USART1接收到的数据volatile uint16_t com1_rx_len = 0; //接收帧数据的长度volatile uint8_t com1_recv_end_flag = 0;//帧数据接收完成标志uint8_t com1_rx_buffer[400]={0}; //接收数据缓存uint8_t DMA_USART1_TX_BUF[400]={0};//DMA发送缓存
#define USART1_TX_MAX_LEN 1024#define USART1_RX_MAX_LEN 1024
void USART0_Init(uint32_t bound) { //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure;
USART_DeInit(USART1); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //使能USART1时钟 //串口1对应引脚复用映射 GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1 GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1 //USART1端口配置 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_9; //GPIOA10与GPIOA9 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉 GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA9，PA10 //USART1 初始化设置 USART_InitStructure.USART_BaudRate = bound; //波特率设置 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式 USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位 USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式 USART_Init(USART1, &USART_InitStructure); //初始化串口1
NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //串口1中断通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2; //抢占优先级2 NVIC_InitStructure.NVIC_IRQChannelSubPriority =1; //子优先级1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器、 NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn; //嵌套通道为DMA2_Stream5_IRQn NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级为 2 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //响应优先级为 2 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能 NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream7_IRQn ;//串口1发送中断通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级2 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE); //开启串口空闲中断 USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE); // 开启串口DMA接收 USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); // 开启串口DMA发送
/* 配置串口DMA接收*/ DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); // 开启DMA时钟 DMA_DeInit(DMA2_Stream5); //设为默认值 DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR; //DMA外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)com1_rx_buffer; //DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //存储器到外设模式 DMA_InitStructure.DMA_BufferSize = USART1_RX_MAX_LEN; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; //高等优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不开启FIFO模式 DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; //FIFO阈值 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输 DMA_Init(DMA2_Stream5, &DMA_InitStructure); DMA_Cmd(DMA2_Stream5, ENABLE); //使能DMA2_Stream5通道
DMA_DeInit(DMA2_Stream7); //初始化DMA Stream while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE);//等待DMA可配置 /* 配置DMA2 Stream7，USART1发送 */ DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1->DR; //DMA外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (u32)DMA_USART1_TX_BUF; //DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //存储器到外设模式 DMA_InitStructure.DMA_BufferSize = USART1_TX_MAX_LEN; //数据传输量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //使用普通模式 DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输 DMA_Init(DMA2_Stream7, &DMA_InitStructure); //初始化DMA Stream7
DMA_ITConfig(DMA2_Stream7, DMA_IT_TC, ENABLE); //DMA2传输完成中断 DMA_Cmd(DMA2_Stream7, DISABLE); //不使能 USART_Cmd(USART1, ENABLE); //使能串口1}
void DMA2_Stream7_IRQHandler(void){ //清除标志 if(DMA_GetFlagStatus(DMA2_Stream7,DMA_FLAG_TCIF7)!=RESET)//等待DMA2_Steam7传输完成 { DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7); //清除DMA2_Steam7传输完成标志 DMA_Cmd(DMA2_Stream7,DISABLE); //关闭使能 USART_ITConfig(USART1,USART_IT_TC,ENABLE); //打开串口发送完成中断 }}
void DMA_USART1_Send(u8 *data,u16 size)//函数名称可自定义{ memcpy(DMA_USART1_TX_BUF,data,size); //复制数据到DMA发送缓存区 while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE); //确保DMA可以被设置 DMA_SetCurrDataCounter(DMA2_Stream7,size); //设置数据传输长度 DMA_Cmd(DMA2_Stream7,ENABLE); //打开DMA数据流，开始发送}
以上是USART配置
主函数
int main(void){ /*初始化区域*/ USART0_Init(9600); //设置波特率 USART1_Init(9600); USART2_Init(9600); /*静态配置区域*/ while (1) { u8 DATA[] = {0xAA,0xAB,0XAC}; DMA_USART1_Send(DATA,3); }}
