STM32串口——5個串口的使用方法

串口是咱們經常使用的一個數據傳輸接口,STM32F103系列單片機共有5個串口,其中1-3是通用同步/異步串行接口USART(Universal Synchronous/Asynchronous Receiver/Transmitter),4,、5是通用異步串行接口UART(Universal Asynchronous Receiver/Transmitter)。html

STM32學習筆記——5個串口的使用方法
 

 

配置串口包括三部份內容異步

1.  I/O口配置:TXD配置爲複用推輓輸出(GPIO_Mode_AF_PP),RXD配置爲浮空輸入(GPIO_Mode_IN_FLOATING);函數

2.  串口配置:波特率等;學習

3.  中斷向量配置:通常用中斷方式接收數據。url

 

 

注意事項spa

1.  USART1是掛在APB2,使能時鐘命令爲:     htm

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );blog

其餘幾個則掛在APB1上,如2口:接口

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );ip

 

2.  配置4口和5口的時候,中斷名爲UART四、UART5,中斷入口分別爲

UART4_IRQn、UART5_IRQn

對應的中斷服務函數爲

void UART4_IRQHandler(void)

void UART5_IRQHandler(void)。

 

下面是5個串口的配置函數收發數據函數代碼

#include "stm32f10x.h"

#include "misc.h"

#include "stm32f10x_gpio.h"

#include "stm32f10x_usart.h" 

 

void USART1_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;        

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE );

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );

 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //複用推輓輸出;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure); //端口A;

    

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入;

GPIO_Init(GPIOA, &GPIO_InitStructure); //端口A;

 

USART_InitStructure.USART_BaudRate = 9600; //波特率;

USART_InitStructure.USART_WordLength = USART_WordLength_8b; //數據位8位;

USART_InitStructure.USART_StopBits = USART_StopBits_1; //中止位1位;

USART_InitStructure.USART_Parity = USART_Parity_No ; //無校驗位;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

//無硬件流控;

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

//收發模式;

USART_Init(USART1, &USART_InitStructure);//配置串口參數;

 

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設置中斷組,4位搶佔優先級,4位響應優先級;

 

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //中斷號;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶佔優先級;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應優先級;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

 

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

USART_Cmd(USART1, ENABLE); //使能串口;

}

 

void USART1_Send_Byte(u8 Data) //發送一個字節;

{

USART_SendData(USART1,Data);

while( USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET );

}

 

void USART1_Send_String(u8 *Data) //發送字符串;

{

while(*Data)

USART1_Send_Byte(*Data++);

}

 

void USART1_IRQHandler(void) //中斷處理函數;

{

u8 res;    

if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET) //判斷是否發生中斷;

{

USART_ClearFlag(USART1, USART_IT_RXNE); //清除標誌位;

res=USART_ReceiveData(USART1); //接收數據;

USART1_Send_Byte(res); //用戶自定義;

}  

 

 

 

void USART2_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;        

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE );

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );

 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //USART2 TX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //複用推輓輸出;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure); //端口A;

    

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //USART2 RX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入;

GPIO_Init(GPIOA, &GPIO_InitStructure); //端口A;

 

USART_InitStructure.USART_BaudRate = 9600; //波特率;

USART_InitStructure.USART_WordLength = USART_WordLength_8b; //數據位8位;

USART_InitStructure.USART_StopBits = USART_StopBits_1; //中止位1位;

USART_InitStructure.USART_Parity = USART_Parity_No ; //無校驗位;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

//無硬件流控;

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

//收發模式;

USART_Init(USART2, &USART_InitStructure);//配置串口參數;

 

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設置中斷組,4位搶佔優先級,4位響應優先級;

 

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //中斷號;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶佔優先級;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應優先級;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

 

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

USART_Cmd(USART2, ENABLE); //使能串口;

}

 

void USART2_Send_Byte(u8 Data) //發送一個字節;

{

USART_SendData(USART2,Data);

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

}

 

void USART2_Send_String(u8 *Data) //發送字符串;

{

while(*Data)

USART2_Send_Byte(*Data++);

}

 

void USART2_IRQHandler(void) //中斷處理函數;

{

u8 res;    

if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET) //判斷是否發生中斷;

{

USART_ClearFlag(USART2, USART_IT_RXNE); //清除標誌位;

res=USART_ReceiveData(USART2); //接收數據;

USART2_Send_Byte(res); //用戶自定義;

}  

 

 

 

void USART3_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;        

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE );

 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART3 TX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //複用推輓輸出;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure); //端口B;

    

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //USART3 RX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入;

GPIO_Init(GPIOB, &GPIO_InitStructure); //端口B;

 

USART_InitStructure.USART_BaudRate = 9600; //波特率;

USART_InitStructure.USART_WordLength = USART_WordLength_8b; //數據位8位;

USART_InitStructure.USART_StopBits = USART_StopBits_1; //中止位1位;

USART_InitStructure.USART_Parity = USART_Parity_No ; //無校驗位;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

//無硬件流控;

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

//收發模式;

USART_Init(USART3, &USART_InitStructure);//配置串口參數;

 

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設置中斷組,4位搶佔優先級,4位響應優先級;

 

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //中斷號;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶佔優先級;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應優先級;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

 

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

USART_Cmd(USART3, ENABLE); //使能串口;

}

 

void USART3_Send_Byte(u8 Data) //發送一個字節;

{

USART_SendData(USART3,Data);

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

}

 

void USART3_Send_String(u8 *Data) //發送字符串;

{

while(*Data)

USART3_Send_Byte(*Data++);

}

 

void USART3_IRQHandler(void) //中斷處理函數;

{

u8 res;    

if(USART_GetITStatus(USART3, USART_IT_RXNE) == SET) //判斷是否發生中斷;

{

USART_ClearFlag(USART3, USART_IT_RXNE); //清除標誌位;

res=USART_ReceiveData(USART3); //接收數據;

USART3_Send_Byte(res); //用戶自定義;

}  

 

 

 

void UART4_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;        

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE );

RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE );

 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //UART4 TX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //複用推輓輸出;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, &GPIO_InitStructure); //端口C;

    

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //UART4 RX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入;

GPIO_Init(GPIOC, &GPIO_InitStructure); //端口C;

 

USART_InitStructure.USART_BaudRate = 9600; //波特率;

USART_InitStructure.USART_WordLength = USART_WordLength_8b; //數據位8位;

USART_InitStructure.USART_StopBits = USART_StopBits_1; //中止位1位;

USART_InitStructure.USART_Parity = USART_Parity_No ; //無校驗位;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

//無硬件流控;

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

//收發模式;

USART_Init(UART4, &USART_InitStructure);//配置串口參數;

 

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設置中斷組,4位搶佔優先級,4位響應優先級;

 

NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; //中斷號;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶佔優先級;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應優先級;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

 

USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);

USART_Cmd(UART4, ENABLE); //使能串口;

}

 

void UART4_Send_Byte(u8 Data) //發送一個字節;

{

USART_SendData(UART4,Data);

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

}

 

void UART4_Send_String(u8 *Data) //發送字符串;

{

while(*Data)

UART4_Send_Byte(*Data++);

}

 

void UART4_IRQHandler(void) //中斷處理函數;

{

u8 res;    

if(USART_GetITStatus(UART4, USART_IT_RXNE) == SET) //判斷是否發生中斷;

{

USART_ClearFlag(UART4, USART_IT_RXNE); //清除標誌位;

res=USART_ReceiveData(UART4); //接收數據;

UART4_Send_Byte(res); //用戶自定義;

}  

 

 

 

void UART5_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;        

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE );

RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE );

 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //UART5 TX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //複用推輓輸出;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, &GPIO_InitStructure); //端口C;

    

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //UART5 RX;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空輸入;

GPIO_Init(GPIOD, &GPIO_InitStructure); //端口D;

 

USART_InitStructure.USART_BaudRate = 9600; //波特率;

USART_InitStructure.USART_WordLength = USART_WordLength_8b; //數據位8位;

USART_InitStructure.USART_StopBits = USART_StopBits_1; //中止位1位;

USART_InitStructure.USART_Parity = USART_Parity_No ; //無校驗位;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

//無硬件流控;

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

//收發模式;

USART_Init(UART5, &USART_InitStructure);//配置串口參數;

 

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設置中斷組,4位搶佔優先級,4位響應優先級;

 

NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //中斷號;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶佔優先級;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應優先級;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

 

USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);

USART_Cmd(UART5, ENABLE); //使能串口;

}

 

void UART5_Send_Byte(u8 Data) //發送一個字節;

{

USART_SendData(UART5,Data);

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

}

 

void UART5_Send_String(u8 *Data) //發送字符串;

{

while(*Data)

UART5_Send_Byte(*Data++);

}

 

void UART5_IRQHandler(void) //中斷處理函數;

{

u8 res;    

if(USART_GetITStatus(UART5, USART_IT_RXNE) == SET) //判斷是否發生中斷;

{

USART_ClearFlag(UART5, USART_IT_RXNE); //清除標誌位;

res=USART_ReceiveData(UART5); //接收數據;

UART5_Send_Byte(res); //用戶自定義;

}  

 

祝你們學習愉快!