1. 配置 GPIO 时钟、串口时钟、复用时钟

2. 配置 GPIO 结构体

3. 配置串口

1. 2. 3. 步骤基本框架在 5. STM32——串口发送字符、字符串 + printf 的重定向

4. 配置中断 NVIC 抢占优先级

在 misc.h 头文件中查找相关函数函数

USART1_IRQn 在 stm32f10x.h 头文件中查找相关函数函数

//4. 配置中断抢占优先级
NVIC_InitTypeDef nvicInitStructure

//4.1 配置优先级组
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2)

//4.2 配置结构体
nvicInitStructure.NVIC_IRQChannel					=	USART1_IRQn; 
nvicInitStructure.NVIC_IRQChannelPreemptionPriority	=	1;
nvicInitStructure.NVIC_IRQChannelSubPriority		=	1;
nvicInitStructure.NVIC_IRQChannelCmd				=	ENABLE;

//4.3 初始化结构体
NVIC_Init(&nvicInitStructure);

5. 搭建串口中断服务函数

USART1_IRQHandler 在 startup_stm32f10x_hd.s 文件中查找

//5. 搭建串口中断服务函数
void USART1_IRQHandler(void)
{
		char temp;
	
		if( USART_GetITStatus(USART1, USART_IT_RXNE) != RESET ) //发生中断
		{
				temp=USART_ReceiveData(USART1);
				if(temp=='O')
				{
						GPIO_ResetBits(GPIOC, GPIO_Pin_13);
						USARTSendStr(USART1, "LED is open");
				}
				else if(temp=='C')
				{
						GPIO_SetBits(GPIOC, GPIO_Pin_13);
						USARTSendStr(USART1, "LED is close");
				}
		}
		
}

用串口发送数据点亮LED

usart.c

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

void usart_init()
{
		GPIO_InitTypeDef 	gpioInitStructure;
		USART_InitTypeDef	usartInitStructure;
		NVIC_InitTypeDef 	nvicInitStructure;
		
		//1.配置时钟
		
		//1.1配置GPIOA、串口时钟、复用时钟
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
		
		//2.配置GPIOA结构体
		
		//2.1 A9 TX
		gpioInitStructure.GPIO_Mode		= GPIO_Mode_AF_PP;
		gpioInitStructure.GPIO_Pin		= GPIO_Pin_9;
		gpioInitStructure.GPIO_Speed	= GPIO_Speed_50MHz;
		
		GPIO_Init(GPIOA, &gpioInitStructure);
		
		//2.2 A10 RX
		gpioInitStructure.GPIO_Mode		= GPIO_Mode_IN_FLOATING;
		gpioInitStructure.GPIO_Pin		= GPIO_Pin_10;
		
		GPIO_Init(GPIOA, &gpioInitStructure);

		//3.配置串口结构体
		usartInitStructure.USART_BaudRate				= 115200;
		usartInitStructure.USART_HardwareFlowControl	= USART_HardwareFlowControl_None;
		usartInitStructure.USART_Mode					= USART_Mode_Tx | USART_Mode_Rx;
		usartInitStructure.USART_Parity					= USART_Parity_No;
		usartInitStructure.USART_StopBits				= USART_StopBits_1;
		usartInitStructure.USART_WordLength				= USART_WordLength_8b;
		
		//3.1 初始化串口
		USART_Init(USART1, &usartInitStructure);
		
		//3.2 配置串口中断
		USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
		
		//3.3 使能串口
		USART_Cmd(USART1, ENABLE);
		
		//4.配置NVIC中断优先级
		
		//4.1 配置优先级组
		NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
		
		//4.2 配置NVIC优先级结构体
		nvicInitStructure.NVIC_IRQChannel					=	USART1_IRQn;
		nvicInitStructure.NVIC_IRQChannelPreemptionPriority	=	1;
		nvicInitStructure.NVIC_IRQChannelSubPriority		=	1;
		nvicInitStructure.NVIC_IRQChannelCmd				=	ENABLE;
		
		//4.3 初始化NVIC优先级
		NVIC_Init(&nvicInitStructure);
		
}

void USARTSendByte(USART_TypeDef* USARTx, uint16_t Data)
{
		USART_SendData( USARTx, Data);
		while( USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET );
}

void USARTSendStr(USART_TypeDef* USARTx, char* str)
{
		uint16_t i=0;
		
		while( *(str+i) != '\0' )
		{
				/*
				USART_SendData( USARTx, *(str+i));
				while( USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET );
				*/
				
				USARTSendByte( USART1, *(str+i) );
				i++;
		}
		
		while( USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET );
}

usart.h

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

void usart_init(void);
void USARTSendByte(USART_TypeDef* USARTx, uint16_t Data);
void USARTSendStr(USART_TypeDef* USARTx, char* str);

main.c

#include "stm32f10x.h"
#include "main.h"
#include "led.h"
#include "shake.h"
#include "relay.h"
#include "exti.h"
#include "usart.h"
#include "tim.h"

void delay(uint16_t time)
{
	uint16_t i=0;
	
	while(time--)
	{
		i=10000;
		while(i--);
	}
}

int  main()
{
//		usart_init();
		LED_Init();
		tim_Init();
		
		GPIO_SetBits(GPIOC, GPIO_Pin_13);

		
//		USARTSendByte(USART1, 'O');
//		USARTSendByte(USART1, 'K');
//		printf("Yinyuer is a pretty girl!");
		
		while(1)
		{
				
		}
}


//5. 搭建串口中断服务函数
void USART1_IRQHandler(void)
{
		char temp;
	
		if( USART_GetITStatus(USART1, USART_IT_RXNE) != RESET )
		{
				temp=USART_ReceiveData(USART1);
				if(temp=='O')
				{
						GPIO_ResetBits(GPIOC, GPIO_Pin_13);
						USARTSendStr(USART1, "LED is open");
				}
				else if(temp=='C')
				{
						GPIO_SetBits(GPIOC, GPIO_Pin_13);
						USARTSendStr(USART1, "LED is close");
				}
		}
		
}