串口是我們常用的一個數(shù)據(jù)傳輸接口,STM32F103系列單片機(jī)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)。
看完文章總結(jié)可以看下邊的資料了解詳細(xì)情況
(stm32 USART串口應(yīng)用)
http://www.makeru.com.cn/live/1392_1164.html?s=45051
通過Z-stack協(xié)議棧實現(xiàn)串口透傳
http://www.makeru.com.cn/live/1758_330.html?s=45051
配置串口包括三部分內(nèi)容:
1. I/O口配置:TXD配置為復(fù)用推挽輸出(GPIO_Mode_AF_PP),RXD配置為浮空輸入(GPIO_Mode_IN_FLOATING);
2. 串口配置:波特率等;
3. 中斷向量配置:一般用中斷方式接收數(shù)據(jù)瘪匿。
注意事項:
1. USART1是掛在APB2,使能時鐘命令為:
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );
其他幾個則掛在APB1上寻馏,如2口:
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );
2. 配置4口和5口的時候棋弥,中斷名為UART4、UART5诚欠,中斷入口分別為
UART4_IRQn顽染、UART5_IRQn
對應(yīng)的中斷服務(wù)函數(shù)為
void UART4_IRQHandler(void)
和
void UART5_IRQHandler(void)。
下面是5個串口的配置函數(shù)和收發(fā)數(shù)據(jù)函數(shù)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; //復(fù)用推挽輸出;
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(shù)據(jù)位8位;
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位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(fā)模式;
USART_Init(USART1, &USART_InitStructure);//配置串口參數(shù);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置中斷組轰绵,4位搶占優(yōu)先級粉寞,4位響應(yīng)優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //中斷號;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應(yīng)優(yōu)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(fā)送一個字節(jié);
{
USART_SendData(USART1,Data);
while( USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET );
}
void USART1_Send_String(u8 *Data) //發(fā)送字符串;
{
while(*Data)
USART1_Send_Byte(*Data++);
}
void USART1_IRQHandler(void) //中斷處理函數(shù);
{
u8 res;
if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET) //判斷是否發(fā)生中斷;
{
USART_ClearFlag(USART1, USART_IT_RXNE); //清除標(biāo)志位;
res=USART_ReceiveData(USART1); //接收數(shù)據(jù);
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; //復(fù)用推挽輸出;
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(shù)據(jù)位8位;
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位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(fā)模式;
USART_Init(USART2, &USART_InitStructure);//配置串口參數(shù);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置中斷組,4位搶占優(yōu)先級左腔,4位響應(yīng)優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //中斷號;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應(yīng)優(yōu)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(fā)送一個字節(jié);
{
USART_SendData(USART2,Data);
while( USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET );
}
void USART2_Send_String(u8 *Data) //發(fā)送字符串;
{
while(*Data)
USART2_Send_Byte(*Data++);
}
void USART2_IRQHandler(void) //中斷處理函數(shù);
{
u8 res;
if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET) //判斷是否發(fā)生中斷;
{
USART_ClearFlag(USART2, USART_IT_RXNE); //清除標(biāo)志位;
res=USART_ReceiveData(USART2); //接收數(shù)據(jù);
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; //復(fù)用推挽輸出;
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(shù)據(jù)位8位;
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位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(fā)模式;
USART_Init(USART3, &USART_InitStructure);//配置串口參數(shù);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置中斷組唧垦,4位搶占優(yōu)先級,4位響應(yīng)優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //中斷號;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應(yīng)優(yōu)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(fā)送一個字節(jié);
{
USART_SendData(USART3,Data);
while( USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET );
}
void USART3_Send_String(u8 *Data) //發(fā)送字符串;
{
while(*Data)
USART3_Send_Byte(*Data++);
}
void USART3_IRQHandler(void) //中斷處理函數(shù);
{
u8 res;
if(USART_GetITStatus(USART3, USART_IT_RXNE) == SET) //判斷是否發(fā)生中斷;
{
USART_ClearFlag(USART3, USART_IT_RXNE); //清除標(biāo)志位;
res=USART_ReceiveData(USART3); //接收數(shù)據(jù);
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; //復(fù)用推挽輸出;
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(shù)據(jù)位8位;
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位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(fā)模式;
USART_Init(UART4, &USART_InitStructure);//配置串口參數(shù);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置中斷組液样,4位搶占優(yōu)先級振亮,4位響應(yīng)優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; //中斷號;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應(yīng)優(yōu)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(fā)送一個字節(jié);
{
USART_SendData(UART4,Data);
while( USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET );
}
void UART4_Send_String(u8 *Data) //發(fā)送字符串;
{
while(*Data)
UART4_Send_Byte(*Data++);
}
void UART4_IRQHandler(void) //中斷處理函數(shù);
{
u8 res;
if(USART_GetITStatus(UART4, USART_IT_RXNE) == SET) //判斷是否發(fā)生中斷;
{
USART_ClearFlag(UART4, USART_IT_RXNE); //清除標(biāo)志位;
res=USART_ReceiveData(UART4); //接收數(shù)據(jù);
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; //復(fù)用推挽輸出;
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(shù)據(jù)位8位;
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位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(fā)模式;
USART_Init(UART5, &USART_InitStructure);//配置串口參數(shù);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設(shè)置中斷組巧还,4位搶占優(yōu)先級,4位響應(yīng)優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //中斷號;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //響應(yīng)優(yōu)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(fā)送一個字節(jié);
{
USART_SendData(UART5,Data);
while( USART_GetFlagStatus(UART5, USART_FLAG_TC) == RESET );
}
void UART5_Send_String(u8 *Data) //發(fā)送字符串;
{
while(*Data)
UART5_Send_Byte(*Data++);
}
void UART5_IRQHandler(void) //中斷處理函數(shù);
{
u8 res;
if(USART_GetITStatus(UART5, USART_IT_RXNE) == SET) //判斷是否發(fā)生中斷;
{
USART_ClearFlag(UART5, USART_IT_RXNE); //清除標(biāo)志位;
res=USART_ReceiveData(UART5); //接收數(shù)據(jù);
UART5_Send_Byte(res); //用戶自定義;
}
}
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