STM32 --- serial port communication

Light up through serial port communication LED The lamp

Realize sending through serial port ’1’ Light up the red light , send out ’2’ Turn on the yellow light , send out ‘3’ Turn on all lights , Send other data and turn off all lights .

Basic serial port configuration

No need to interrupt , So the interrupt code in the code is commented out .
usart.h The code is as follows ：

#ifndef __USART_H
#define __USART_H
#include "stm32f10x.h"

void Usart_Init(void);
void Usart_SendByte(USART_TypeDef* pUSARTx,uint8_t data);

#endif /* USART_H */

usart.c The code is as follows ：

#include "usart.h"
#include "stm32f10x.h"
#include "stdio.h"

//static void Nvic_Init(){
    
// NVIC_InitTypeDef NVIC_InitStructure;
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
// 
// NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
// NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
// NVIC_Init(&NVIC_InitStructure);
//}


void Usart_Init(){
    
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	
	// open IO The clock 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
	
	// send out 
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	
	// Accept 
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	
	// Interrupt priority configuration 
// Nvic_Init();
	
	// Serial port configuration 
	USART_InitStructure.USART_BaudRate=115200;
	USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;
	USART_InitStructure.USART_Parity=USART_Parity_No;
	USART_InitStructure.USART_StopBits=USART_StopBits_1;
	USART_InitStructure.USART_WordLength=USART_WordLength_8b;
	USART_Init(USART1,&USART_InitStructure);
	
// USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
	
	USART_Cmd(USART1,ENABLE);
}

// send data 
//void Usart_SendByte(USART_TypeDef* pUSARTx,uint8_t data){
    
// USART_SendData(pUSARTx,data);
// while( USART_GetFlagStatus(pUSARTx,USART_FLAG_TXE) == RESET);
// 
//}

// Interrupt service function 
//void USART1_IRQHandler(){
    
// uint8_t text;
// if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET ){
    
// text = USART_ReceiveData(USART1);
// 
// USART_SendData(USART1,text);
// }

//}

// redefinition fputc function 
// printf Function redirection 
int fputc(int ch, FILE *f)
{
          
	USART_SendData(USART1,(uint8_t) ch);	
	while( USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET);
	return (ch);
}
//getchar Function redirection 
int fgetc(FILE *f)
{
          
	while( USART_GetFlagStatus(USART1,USART_FLAG_RXNE) == RESET);
	return (int)USART_ReceiveData(USART1);
}

main function code

#include "stm32f10x.h"
#include "led.h"
#include "usart.h"
#include <stdio.h>

int main(void)
{
    
	uint8_t i;
	Usart_Init();
	LED_Init();
	//Usart_SendByte(USART1,100);
	//USART_SendData(USART1,100);
	printf(" Program starts \n");
	while(1){
    
		i = getchar();
		printf("i = %c\n",i);
		
		switch(i){
    
			case '1':
				LED_RED_TOGGLE;
				break;
			case '2':
				LED_YELLOW_TOGGLE;
				break;	
			case '3':
				LED_RED_ON;
				LED_YELLOW_ON;
				break;
			default:
				LED_RED_OFF;
				LED_YELLOW_OFF;
				break;
		}
	}
}

Serial debugging assistant

Be careful

1. You need to check Target => Use MicroLIB
2. If serial assistant is not checked 16 Base number All data sent and received are characters .