STM32 串口发送数据、串口中断 7.19

STM32 串口发送：

全双工 异步 串行通信方式IIC：
CLK（时钟线）
DAT（数据线）同步协议：通过时钟线保证数据线是有效的
异步协议：通过寄存器接受到数据之后产生中断，从而传输数据1.波特率
2.数据帧格式 起始位（不管）数据位（数据位个数）可存在的奇偶校验位停止位
3.流控制软件流控制（发送了特定约定好的字符）硬件流控制（RX TX RTS CTS）USART的编程步骤：1.打开时钟
2.设置GPIO模式
3.USART设置
4.使能串口
5.编写接收发送函数

#ifndef __usart_H_
#define __usart_H_ #include "stm32f10x.h"                  // Device header
void usart1_init(int baud);
void usart1_send_byte(u8 ch);
u8 usart1_recv_byte(void);#endif

#include "usart.h"
#include "stm32f10x.h"                  // Device header
#include "stdio.h"void usart1_init(int baud)
{//1.打开时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);//2.设置GPIO模式//发送方不用设置很多，而接收方需要解析数据所以设置很多东西//PA9-TXGPIO_InitTypeDef GPIO_initStructure;GPIO_initStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出GPIO_initStructure.GPIO_Pin = GPIO_Pin_9;GPIO_initStructure.GPIO_Speed = GPIO_Speed_10MHz;GPIO_Init(GPIOA,&GPIO_initStructure);//PA10-RXGPIO_initStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入GPIO_initStructure.GPIO_Pin = GPIO_Pin_10;GPIO_Init(GPIOA,&GPIO_initStructure);//3.usart USART设置USART_InitTypeDef USART_initStructure;USART_initStructure.USART_BaudRate = baud;//波特率USART_initStructure.USART_WordLength = USART_WordLength_8b;//8位数据位USART_initStructure.USART_Parity = USART_Parity_No;//无奇偶校验位USART_initStructure.USART_StopBits = USART_StopBits_1;//1位停止位USART_initStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件流USART_initStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//接受和发送使能USART_Init(USART1,&USART_initStructure);//4.使能串口USART_Cmd(USART1,ENABLE);}void usart1_send_byte(u8 ch)
{USART_SendData(USART1,ch);//发送一个字节数据while(RESET == USART_GetFlagStatus(USART1,USART_FLAG_TXE));//等待发送完成
}
u8 usart1_recv_byte(void)
{while(RESET == USART_GetFlagStatus(USART1,USART_FLAG_RXNE));//等待数据过来return USART_ReceiveData(USART1);}int fputc(int ch,FILE* file)//重定向printf
{usart1_send_byte(ch);return ch;
}

#include "stm32f10x.h"                  // Device header
#include "usart.h"
#include "stdio.h"
void delay(int n)
{int i;while(n--)for(i=0;i<8050;i++);
}int main(void)
{usart1_init(115200);while(1){//usart1_send_byte('a');printf("ikun\r\n");delay(1000);}
}

串口中断：

USART中断的编程步骤：1.打开时钟
2.设置GPIO模式
3.USART设置
4.使能接受中断
5.配置中断优先级
6.使能串口
7.编写接收发送函数
8.编写中断处理函数

#ifndef __USART_H
#define __USART_H#include "stm32f10x.h"                  // Device headervoid usart1_init(int baud);
void usart1_send_byte(u8 ch);
u8 usart1_recv_byte(void);#endif

#include "stm32f10x.h"                  // Device header
#include "usart.h"
#include "stdio.h"void usart1_init(int baud)
{//1.打开时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);//2.设置GPIO模式//PA9-TXGPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);//PA10-RXGPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_Init(GPIOA, &GPIO_InitStructure);//3.USART初始化USART_InitTypeDef USART_InitStructure;USART_InitStructure.USART_BaudRate = baud; //波特率USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位数据位USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验USART_InitStructure.USART_StopBits = USART_StopBits_1;//1位停止位USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件流控制USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//接受/发送使能USART_Init(USART1, &USART_InitStructure);//使能接收中断RXNEUSART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//配置中断优先级NVIC_InitTypeDef NVIC_InitStructure;NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_Init(&NVIC_InitStructure);//4.使能串口USART_Cmd(USART1, ENABLE);}//编写中断处理函数
void USART1_IRQHandler(void)
{if(SET == USART_GetITStatus(USART1, USART_IT_RXNE)){//USART_ClearITPendingBit(USART1, USART_IT_RXNE);//你想做的事//回显usart1_send_byte(usart1_recv_byte());}
}void usart1_send_byte(u8 ch)
{USART_SendData(USART1, ch);//发送一个字节数据while(RESET == USART_GetFlagStatus(USART1, USART_FLAG_TXE));//等待发送完成
}
u8 usart1_recv_byte(void)
{while(RESET == USART_GetFlagStatus(USART1, USART_FLAG_RXNE));//等待数据过来return USART_ReceiveData(USART1);
}//重写fputc，重定向printf
int fputc(int ch, FILE* file)
{usart1_send_byte(ch);return ch;
}

#include "stm32f10x.h"                  // Device header
#include "usart.h"
#include "stdio.h"void delay(int n)
{int i;while(n--)for(i=0; i<8050; i++);
}int main()
{usart1_init(115200);while(1){//		usart1_send_byte('a');printf("ikun\r\n");delay(1000);}
}