stm32串口的发送与中断接收

stm32串口是实现单片机到上位机通讯的重要手段，通常使用usb转ttl模块进行单片机与上位机的连接，以实现串口的收发等功能。今天学习了串口的发送与中断接收，现总结如下：

步骤总结：

配置两个GPIO分别为RX、TX->配置串口结构体->（请空标志位）->开启定时器中断->使能定时器中断->配置NVIC结构体->编写中断服务函数->编写相关实现程序

UART.h：

#include "UART.h"
#include "stm32f10x.h"
#include "stdio.h"

void UART_Config(void)
{
	//开时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
	//定义结构体变量
	GPIO_InitTypeDef GPIOInitStructure;
	USART_InitTypeDef UARTInitStructure;
	NVIC_InitTypeDef NVICInitStructure;
	//配置PA9  TX
	GPIOInitStructure.GPIO_Pin = GPIO_Pin_9;
	GPIOInitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIOInitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIOInitStructure);
	//配置PA10  RX
	GPIOInitStructure.GPIO_Pin = GPIO_Pin_10;
	GPIOInitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIOInitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIOInitStructure);
	//配置串口结构体
	UARTInitStructure.USART_BaudRate = 115200;
	UARTInitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	UARTInitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	UARTInitStructure.USART_Parity = USART_Parity_No;
	UARTInitStructure.USART_StopBits = USART_StopBits_1;
	UARTInitStructure.USART_WordLength = USART_WordLength_8b;
	USART_Init(USART1, &UARTInitStructure);
	//清空标志位
	USART_ClearFlag(USART1,USART_FLAG_RXNE);
	//开启定时器中断
	USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
	//使能定时器
	USART_Cmd(USART1,ENABLE);
	//配置NVIC结构体
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
	NVICInitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVICInitStructure.NVIC_IRQChannelPreemptionPriority = 3;
	NVICInitStructure.NVIC_IRQChannelSubPriority = 3;
	NVICInitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVICInitStructure);
}
//发送字节
void USART_SendByte(USART_TypeDef* USARTx, uint16_t Data)
{
	USART_SendData(USARTx,Data);
	while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
}	
//发送字符串
void USART_SendStr(USART_TypeDef* USARTx, char *str)
{
	uint16_t i = 0;
	do{
			USART_SendByte(USARTx, *(str + i));
			i++;
	}while(*(str + i) !='\0');
	while(USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET);
}
//重定向printf
int fputc(int ch, FILE *f)
{
	USART_SendData(USART1,(uint8_t) ch);
	while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

	return (ch);
}
//重定向putchar
int fgetc(FILE *f)
{
	while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);

	return (int)USART_ReceiveData(USART1);
}

stm32f10x_it.c:

void USART1_IRQHandler(void)
{
	char temp;
	if(USART_GetITStatus(USART1, USART_IT_RXNE ) != RESET)
	{
		temp = USART_ReceiveData(USART1);
		if(temp == 'O')
		{
			GPIO_ResetBits( LED_G_GPIO_PORT, LED_G_GPIO_PIN);
			USART_SendStr(USART1,"led is ON");
		}
		if(temp == 'C')
		{
			GPIO_SetBits( LED_G_GPIO_PORT, LED_G_GPIO_PIN);
			USART_SendStr(USART1,"led is OFF");
		}
	}
	USART_ClearITPendingBit(USART1,USART_IT_RXNE);//一定要注意清空标志位！
}

main.c:

#include "stm32f10x.h"
#include "UART.h"
#include "stdio.h"
#include "led.h"

int main(void)
{
	UART_Config();
	LED_GPIO_Confing();
	GPIO_SetBits(LED_G_GPIO_PORT, LED_G_GPIO_PIN);
	while(1)
	{
	
	}
}

接收实验功能为：通过串口助手发送O，则点亮LED，发送C，LED熄灭。