代码收藏家 使用STM32通过串口控制LED灯实现串口通讯
1.初始化LED灯（根据原理图修改pin和gpio）：
//初始化led
void Led_Init(void)
{
GPIO_InitTypeDef GPIOB_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
GPIOB_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIOB_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIOB_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIOB_InitStructure);
GPIO_SetBits(GPIOB, 0xFF);
}2.初始化串口
void Uart_Init(void)
{
//第一结构体变量
GPIO_InitTypeDef GPIOA_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//打开时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
//配置引脚
GPIOA_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIOA_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
GPIOA_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIOA_InitStructure);
GPIOA_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIOA_InitStructure.GPIO_Pin = GPIO_Pin_10 ;
GPIOA_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIOA_InitStructure);
//初始化串口
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_Mode = USART_Mode_Rx|USART_Mode_Tx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(USART1, &USART_InitStructure);
//配置NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_Init(&NVIC_InitStructure);
//打开串口中断
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//打开串口
USART_Cmd(USART1, ENABLE);
}3.编译中断函数：
//串口接收缓冲变量
uint16_t receive_data;
//编写中断服务函数
void USART1_IRQHandler()
{
//获取串口状态
if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
//清除标志位
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
//接收一个数据
receive_data = USART_ReceiveData(USART1);
}
}以下是完整代码：
#include "stm32f10x.h"
#include "stdio.h"
//重定向printf函数，输出内容至串口1
struct __FILE{
int handle;
};
FILE __stdout;
int _sys_exit(int x)
//避免半主机模式
{
x = x;
return 0;
}
//修改printf的调用函数
int fputc(int ch,FILE *p)
{
USART_SendData(USART1,(u8)ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
return ch;
}
//初始化led
void Led_Init(void)
{
GPIO_InitTypeDef GPIOB_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
GPIOB_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIOB_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIOB_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIOB_InitStructure);
GPIO_SetBits(GPIOB, 0xFF);
}
//串口配置函数
void Uart_Init(void)
{
//第一结构体变量
GPIO_InitTypeDef GPIOA_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//打开时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
//配置引脚
GPIOA_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIOA_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
GPIOA_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIOA_InitStructure);
GPIOA_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIOA_InitStructure.GPIO_Pin = GPIO_Pin_10 ;
GPIOA_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIOA_InitStructure);
//初始化串口
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_Mode = USART_Mode_Rx|USART_Mode_Tx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(USART1, &USART_InitStructure);
//配置NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_Init(&NVIC_InitStructure);
//打开串口中断
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//打开串口
USART_Cmd(USART1, ENABLE);
}
//串口接收缓冲变量
uint16_t receive_data;
//编写中断服务函数
void USART1_IRQHandler()
{
//获取串口状态
if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
//清除标志位
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
//接收一个数据
receive_data = USART_ReceiveData(USART1);
}
}
int main()
{
u16 led_status1 = 0;
u16 led_status2 = 0;
u16 led_status3 = 0;
u16 led_status4 = 0;
u16 led_status5 = 0;
u16 led_status6 = 0;
u16 led_status7 = 0;
u16 led_status8 = 0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
Led_Init(); //初始化led
Uart_Init();//初始化串口
while(1)
{
switch(receive_data){
case '1':{
if(led_status1 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_0);
printf("LED1 is turn on\n");
led_status1 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_0);
printf("LED1 is turn off\n");
led_status1 = 0;
}
break;
}
case '2':{
if(led_status2 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_1);
printf("LED2 is turn on\n");
led_status2 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_1);
printf("LED2 is turn off\n");
led_status2 = 0;
}
break;
}
case '3':{
if(led_status3 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_2);
printf("LED3 is turn on\n");
led_status3 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_2);
printf("LED3 is turn off\n");
led_status3 = 0;
}
break;
}
case '4':{
if(led_status4 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_3);
printf("LED4 is turn on\n");
led_status4 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_3);
printf("LED4 is turn off\n");
led_status4 = 0;
}
break;
}
case '5':{
if(led_status5 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_4);
printf("LED5 is turn on\n");
led_status5 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_4);
printf("LED5 is turn off\n");
led_status5 = 0;
}
break;
}
case '6':{
if(led_status6 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_5);
printf("LED6 is turn on\n");
led_status6 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_5);
printf("LED6 is turn off\n");
led_status6 = 0;
}
break;
}
case '7':{
if(led_status7 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_6);
printf("LED7 is turn on\n");
led_status7 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_6);
printf("LED7 is turn off\n");
led_status7 = 0;
}
break;
}
case '8':{
if(led_status8 == 0){
GPIO_ResetBits(GPIOB, GPIO_Pin_7);
printf("LED8 is turn on\n");
led_status8 = 1;
}
else{
GPIO_SetBits(GPIOB, GPIO_Pin_7);
printf("LED8 is turn off\n");
led_status8 = 0;
}
break;
}
}
}
}
效果如下
