串口通信(Serial Communications)实现单片机与电脑或者其它外设进行通信,通信时只需两根线(TX,RX)就可以实现数据传输。STM32f103有三个串口,分别为串口1(RX PA10, TX PA 9),串口2(RX PA3,TX PA2),串口3(RX PB11,TX PB10)。
以下代码是配置三个串口:
usart.c
#include "sys.h"
#include "usart.h"
#if SYSTEM_SUPPORT_OS
#include "includes.h"
#endif
#if 1
#pragma import(__use_no_semihosting)
struct __FILE
{
int handle;
};
FILE __stdout;
_sys_exit(int x)
{
x = x;
}
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);
USART1->DR = (u8) ch;
return ch;
}
#endif
#if EN_USART1_RX
u8 USART1_RX_BUF[USART1_REC_LEN];
u16 USART1_RX_STA=0;
void uart1_init(u32 bound){
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = bound;
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(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}
void USART1_IRQHandler(void)
{
u8 Res;
#if SYSTEM_SUPPORT_OS
OSIntEnter();
#endif
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
Res =USART_ReceiveData(USART1);
if((USART1_RX_STA&0x8000)==0)
{
if(USART1_RX_STA&0x4000)
{
if(Res!=0x0a)USART1_RX_STA=0;
else USART1_RX_STA|=0x8000;
}
else
{
if(Res==0x0d)USART1_RX_STA|=0x4000;
else
{
USART1_RX_BUF[USART1_RX_STA&0X3FFF]=Res ;
USART1_RX_STA++;
if(USART1_RX_STA>(USART1_REC_LEN-1))USART1_RX_STA=0;
}
}
}
}
#if SYSTEM_SUPPORT_OS
OSIntExit();
#endif
}
#endif
#if EN_USART2_RX
u8 USART2_RX_BUF[USART2_REC_LEN];
u16 USART2_RX_STA = 0;
void uart2_init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStrue;
USART_InitTypeDef USART_InitStrue;
NVIC_InitTypeDef NVIC_InitStrue;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
USART_DeInit(USART2);
GPIO_InitStrue.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStrue.GPIO_Pin=GPIO_Pin_2;
GPIO_InitStrue.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStrue);
GPIO_InitStrue.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStrue.GPIO_Pin=GPIO_Pin_3;
GPIO_Init(GPIOA,&GPIO_InitStrue);
USART_InitStrue.USART_BaudRate=bound;
USART_InitStrue.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStrue.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;
USART_InitStrue.USART_Parity=USART_Parity_No;
USART_InitStrue.USART_StopBits=USART_StopBits_1;
USART_InitStrue.USART_WordLength=USART_WordLength_8b;
USART_Init(USART2,&USART_InitStrue);
USART_Cmd(USART2,ENABLE);
USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
NVIC_InitStrue.NVIC_IRQChannel=USART2_IRQn;
NVIC_InitStrue.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStrue.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStrue.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStrue);
}
void USART2_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART2,USART_IT_RXNE))
{
res= USART_ReceiveData(USART2);
if((USART2_RX_STA&0x8000)==0)
{
if(USART2_RX_STA&0x4000)
{
if(res!=0x0a)USART2_RX_STA=0;
else USART2_RX_STA|=0x8000;
}
else
{
if(res==0x0d)USART2_RX_STA|=0x4000;
else
{
USART2_RX_BUF[USART2_RX_STA&0X3FFF]=res ;
USART2_RX_STA++;
if(USART2_RX_STA>(USART2_REC_LEN-1))USART2_RX_STA=0;
}
}
}
}
}
#endif
#if EN_USART3_RX
u8 USART3_RX_BUF[USART3_REC_LEN];
u16 USART3_RX_STA = 0;
void uart3_init(u32 bound)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
USART_DeInit(USART3);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = bound;
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_Cmd(USART3, ENABLE);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART3_RX_STA=0;
}
void USART3_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART3,USART_IT_RXNE))
{
res= USART_ReceiveData(USART3);
if((USART3_RX_STA&0x8000)==0)
{
if(USART3_RX_STA&0x4000)
{
if(res!=0x0a)USART3_RX_STA=0;
else USART3_RX_STA|=0x8000;
}
else
{
if(res==0x0d)USART3_RX_STA|=0x4000;
else
{
USART3_RX_BUF[USART2_RX_STA&0X3FFF]=res ;
USART3_RX_STA++;
if(USART3_RX_STA>(USART3_REC_LEN-1))USART3_RX_STA=0;
}
}
}
}
}
#endif
usart.h
#ifndef __USART_H
#define __USART_H
#include "stdio.h"
#include "sys.h"
#define USART1_REC_LEN 200
#define EN_USART1_RX 1
extern u8 USART1_RX_BUF[USART1_REC_LEN];
extern u16 USART1_RX_STA;
void uart1_init(u32 bound);
#define USART2_REC_LEN 200
#define EN_USART2_RX 1
extern u8 USART2_RX_BUF[USART2_REC_LEN];
extern u16 USART2_RX_STA;
void uart2_init(u32 bound);
#define USART3_REC_LEN 200
#define EN_USART3_RX 1
extern u8 USART3_RX_BUF[USART3_REC_LEN];
extern u16 USART3_RX_STA;
void uart3_init(u32 bound);
#endif
main.c
#include "stm32f10x.h"
#include "usart.h"
#include "delay.h"
#include "led.h"
#include "sys.h"
int main()
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart1_init(9600);
uart2_init(9600);
uart3_init(9600);
delay_init(50);
LED_Init();
LED = 0;
while(1)
{
if(USART1_RX_STA&0x8000)
{
printf("串口1:我接收到了串口数据:%s\r\n",USART1_RX_BUF);
USART1_RX_STA = 0;
}
if(USART2_RX_STA&0x8000)
{
LED = 0;
USART2_RX_STA = 1;
}
if(USART3_RX_STA&0x8000)
{
LED = 1;
USART3_RX_STA = 1;
}
delay_ms(500);
}
return 0;
}
注意,程序里有点问题单不影响使用,在主函数中USART2_RX_STA = 1;应改为USART2_RX_STA = 0; USART3_RX_STA = 1;应改为USART3_RX_STA = 0;,在例程代码里记得修改!!!
以上代码可以直接使用(亲测有效),实验现象如main函数注释一样。
完整程序链接:https://pan.baidu.com/s/1ueNuL6bq1aHhaEjrfNzYWA
提取码:5656
侵删!!!!
/*********************************************************/
更新:2023年5月11日
将usart.c文件USART3_IRQHandler函数中的
USART3_RX_BUF[USART2_RX_STA&0X3FFF]=res ;
改为
USART3_RX_BUF[USART3_RX_STA&0X3FFF]=res ;
USART3_RX_STA手滑写成了USART2_RX_STA不然会导致串口三接收数据有误
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