STM32F103ZET6 5串口通信问题

STM32F103ZET6 5串口通信问题

今天调试成功STM32F103ZET6 5串口通信,其中主要是注意点是：

1、 USATR1和USATR2，USATR3，UATR4，UATR5挂载的时钟不一样，第一个挂载在

APB2上，其余四个挂载在APB1上；例如：

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //USART1时钟配置 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE); //USART2时钟配置 ； RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //USART3时钟配置 ； RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4,ENABLE); //UART4时钟配置 ； RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5,ENABLE); //UART5时钟配置 ； 2、 如上例中红色字显示一样，UART4和UART5是不一样的，

UART：universal asynchronous receiver and transmitter通用异步收发器

USART:universal synchronous asynchronous receiver and transmitter通用同步异步收发器。一般而言，单片机中，名称为UART的接口一般只能用于异步串行通讯，而名称为USART的接口既可以用于同步串行通讯，也能用于异步串行通讯。 下面贴出我的代码： void RCC_Configuration(void); void GPIO_Configuration(void); void NVIC_Configuration(void); void USART_Configuration(void);

int main(void) {

RCC_Configuration(); //系统时钟初始化 GPIO_Configuration();//端口初始化 USART_Configuration(); NVIC_Configuration(); while(1); }

void RCC_Configuration(void) {

SystemInit();//72m

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE); //USART2时钟配置 ； RCC_APB1PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //USART2,3端口复用； RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //USART1端口复用； RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD,ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //USART3时钟配置 ； RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4,ENABLE); //UART4时钟配置 ；

}

RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5,ENABLE); //UART5时钟配置 ；

void GPIO_Configuration(void) {

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5; //LED1

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;//USATR5_RX GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOD,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_12;//USATR5_TX GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_Init(GPIOC,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;//UATR4_RX GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOC,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//UATR4_TX GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_Init(GPIOC,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;//USATR3_RX GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//USATR3_TX GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_3;//USATR2_RX GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA,&GPIO_InitStructure); //LED

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;//USATR2_TX GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; }

void NVIC_Configuration(void) {

NVIC_InitTypeDef NVIC_InitStructure;

//USART5的中断优先级配置

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); }

NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); //USART4的中断优先级配置

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); //USART3的中断优先级配置 //USART2的中断优先级配置

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5; //LED0 GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_Init(GPIOE,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_Init(GPIOB,&GPIO_InitStructure);

void USART_Configuration(void) {

USART_InitTypeDef USART_InitStructure;

//USART5的串口配置

USART_InitStructure.USART_BaudRate=9600; USART_Init(UART4,&USART_InitStructure);

USART_ITConfig(UART4,USART_IT_RXNE,ENABLE); USART_Cmd(UART4,ENABLE);

USART_ClearFlag(UART4,USART_FLAG_TC); //USART4的串口配置

USART_InitStructure.USART_BaudRate=9600;

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(USART3,&USART_InitStructure);

USART_ITConfig(USART3,USART_IT_RXNE,ENABLE); USART_Cmd(USART3,ENABLE);

USART_ClearFlag(USART3,USART_FLAG_TC); USART_Init(USART2,&USART_InitStructure);

USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); USART_Cmd(USART2,ENABLE);

USART_ClearFlag(USART2,USART_FLAG_TC); //USART3的串口配置

USART_InitStructure.USART_BaudRate=9600;

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; //USART2的串口配置

USART_InitStructure.USART_BaudRate=9600;

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_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(UART5,&USART_InitStructure);

USART_ITConfig(UART5,USART_IT_RXNE,ENABLE); USART_Cmd(UART5,ENABLE);

USART_ClearFlag(UART5,USART_FLAG_TC);

一下为中断代码：

void USART2_IRQHandler(void) {

u32 k;

if(USART_GetITStatus(USART2,USART_IT_RXNE)!=RESET) {

k=USART_ReceiveData(USART2); }

void USART3_IRQHandler(void) {

u32 k;

if(USART_GetITStatus(USART3,USART_IT_RXNE)!=RESET) {

k=USART_ReceiveData(USART3);

if(k =='a')

{

GPIO_ResetBits(GPIOE,GPIO_Pin_5); USART_SendData(USART2,'1');

while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET);

} else {

GPIO_SetBits(GPIOE,GPIO_Pin_5); USART_SendData(USART2,'3');

while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET);

}

}

}

if(k =='c')

{

GPIO_ResetBits(GPIOE,GPIO_Pin_5); USART_SendData(USART3,'1');

while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);

} else {

GPIO_SetBits(GPIOE,GPIO_Pin_5); USART_SendData(USART3,'3');

while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);

}

}

void UART4_IRQHandler(void) {

u32 k;

if(USART_GetITStatus(UART4,USART_IT_RXNE)!=RESET) {

k=USART_ReceiveData(UART4); }

void UART5_IRQHandler(void) {

if(k =='c')

{

GPIO_ResetBits(GPIOE,GPIO_Pin_5); USART_SendData(UART4,'1');

while(USART_GetFlagStatus(UART4,USART_FLAG_TXE)==RESET);

} else {

GPIO_SetBits(GPIOE,GPIO_Pin_5); USART_SendData(UART4,'3');

while(USART_GetFlagStatus(UART4,USART_FLAG_TXE)==RESET);

}

}

u32 k;

if(USART_GetITStatus(UART5,USART_IT_RXNE)!=RESET) {

k=USART_ReceiveData(UART5); }

if(k =='c')

{

GPIO_ResetBits(GPIOE,GPIO_Pin_5); USART_SendData(UART5,'1');

while(USART_GetFlagStatus(UART5,USART_FLAG_TXE)==RESET);

} else {

GPIO_SetBits(GPIOE,GPIO_Pin_5); USART_SendData(UART5,'3');

while(USART_GetFlagStatus(UART5,USART_FLAG_TXE)==RESET);

}

}

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