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stm32f103双串口收发(调试通过)

发布时间:2020-08-25 发布时间:
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实现功能:


初始化三个串口,调用两个,一个串口发送一个串口接收


串口数据接收除接收数据外还需给出帧有效数据字节长度;


串口可使用USART1、USART2、USART3,串口参数能自由设置;


实现不定长数据帧的串口收发


设计思路及流程:


将中断串口参数设置初始化,中断函数的处理写在USART.C 文件里面,再使用主函数文件进行调用。


1. 建立usart.c  usart.h 文件


3个串口的串口参数能自由设置,结构体初始化


Usart1:

 

 

Usart2:

 

Usart3:

 

 

中断函数编写:


定义中断函数数组

 

串口一中断函数;


if(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET)//


接收中断,每接收一个字节(8位二进制数据),中断一次,每次中断(即每接收一个数据)都执行一次下列程序

 

 

串口二中断函数;

 

 

串口三中断函数;

 

 

字符串处理函数:

 

Usaert.h


设置最大接收字节数,使能串口


 

2.主函数实现:


Main.c


包含头文件,定义数组

 

定义变量,延时,串口初始化

 

While 循环内 设置数组长度length每次接收到一个字节的数据后usart1_in++,

 

2. 实际功能实现任意两个串口收发


 引脚设置:   PA9  USART1_TX


            PA10  USART1_RX


  发送串口修改选择箭头所示的串口名,可以修改为USART2,USART3

到目前为止这种方法编写的程序只能进入debug模式进行演示,还必须得分步调试,其它串口才能收到,如图所示

话不多说,直接上代码


串口二接收情况

串口三接收情况

完整代码

USART.C  


#include "sys.h"

#include "usart.h"

#include

#include

#if SYSTEM_SUPPORT_UCOS

#include "includes.h"

#endif

 

#if 1

#pragma import(__use_no_semihosting)

                                     //±ê×¼¿âÐèÒªµÄÖ§³Öº¯Êý

struct __FILE

{

int handle; 

};

 

FILE __stdout;

                                     //±ÜÃâʹÓðëÖ÷»úģʽ   

 

_sys_exit(int x)

{

x = x;

}

                                     //Öض¨Òåfputcº¯Êý

int fputc1(int ch, FILE *f)

{

while((USART1->SR&0X40)==0);//Ñ­»··¢ËÍ,Ö±µ½·¢ËÍÍê±Ï

    USART1->DR = (u8) ch;

return ch;

}

 

int fputc2(int ch, FILE *f)

{

while((USART2->SR&0X40)==0);//Ñ­»··¢ËÍ,Ö±µ½·¢ËÍÍê±Ï

    USART2->DR = (u8) ch;

return ch;

}

 

 

int fputc3(int ch, FILE *f)

{

while((USART3->SR&0X40)==0);//Ñ­»··¢ËÍ,Ö±µ½·¢ËÍÍê±Ï

    USART3->DR = (u8) ch;

return ch;

}

#endif

 

#if EN_USARTx_RX   //Èç¹ûʹÄÜÁ˽ÓÊÕ

//´®¿Ú1ÖжϷþÎñ³ÌÐò

 

u8 USART_RX_BUF[USART_REC_LEN];     //½ÓÊÕ»º³å,×î´óUSART_REC_LEN¸ö×Ö½Ú.

//½ÓÊÕ״̬

//bit15£¬ ½ÓÊÕÍê³É±êÖ¾

//bit14£¬ ½ÓÊÕµ½0x0d

//bit13~0£¬ ½ÓÊÕµ½µÄÓÐЧ×Ö½ÚÊýÄ¿

u16 USART_RX_STA=0;       //½ÓÊÕ״̬±ê¼Ç

 

void usart1_init(u32 bound)

{

    //GPIO¶Ë¿ÚÉèÖÃ

    GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);//ʹÄÜUSART1£¬GPIOAʱÖÓÒÔ¼°¸´Óù¦ÄÜʱÖÓ

//USART1_TX   PA.9

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö

    GPIO_Init(GPIOA, &GPIO_InitStructure);

 

    //USART1_RX   PA.10

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë

    GPIO_Init(GPIOA, &GPIO_InitStructure);

 

   //Usart1 NVIC ÅäÖÃ

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//ÇÀÕ¼ÓÅÏȼ¶1

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //×ÓÓÅÏȼ¶0

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;      //IRQͨµÀʹÄÜ

NVIC_Init(&NVIC_InitStructure);                          //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯VIC¼Ä´æÆ÷

 

 

   //USART ³õʼ»¯ÉèÖÃ

 

USART_InitStructure.USART_BaudRate = 115200;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8λÊý¾Ý¸ñʽ

USART_InitStructure.USART_StopBits = USART_StopBits_2;//Ò»¸öֹͣλ

USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæżУÑéλ

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½

 

    USART_Init(USART1, &USART_InitStructure); //³õʼ»¯´®¿Ú

// USART_ITConfig(USART1, USART_IT_TXE, ENABLE);//ʹÄÜÖжÏ

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿ªÆôÖжÏ

    USART_Cmd(USART1, ENABLE);                    //ʹÄÜ´®¿Ú

}

 

void usart2_init(u32 bound)

{

//GPIO¶Ë¿ÚÉèÖÃ

    GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

 

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_AFIO, ENABLE); //ʹÄÜUSART2£¬GPIOAʱÖÓÒÔ¼°¸´Óù¦ÄÜʱÖÓ

//USART2_TX   PA.2

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö

    GPIO_Init(GPIOA, &GPIO_InitStructure);

 

    //USART2_RX   PA.3

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;    

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init(GPIOA, &GPIO_InitStructure);//¸¡¿ÕÊäÈë

 

   //Usart2 NVIC ÅäÖÃ

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//ÇÀÕ¼ÓÅÏȼ¶1

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //×ÓÓÅÏȼ¶0

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;      //IRQͨµÀʹÄÜ

NVIC_Init(&NVIC_InitStructure);                          //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯VIC¼Ä´æÆ÷

 

   //USART ³õʼ»¯ÉèÖÃ

 

USART_InitStructure.USART_BaudRate =115200;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8λÊý¾Ý¸ñʽ

USART_InitStructure.USART_StopBits = USART_StopBits_2;//Ò»¸öֹͣλ

USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæżУÑéλ

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½

 

    USART_Init(USART2, &USART_InitStructure); //³õʼ»¯´®¿Ú

// USART_ITConfig(USART2, USART_IT_TXE, ENABLE);//ʹÄÜÖжÏ

    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿ªÆôÖжÏ

    USART_Cmd(USART2, ENABLE);                    //ʹÄÜ´®¿Ú

}

 

 

 

 

 

void usart3_init(u32 bound)

{

    //GPIO¶Ë¿ÚÉèÖÃ

    GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

 

RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);//ʹÄÜUSART1£¬GPIOAʱÖÓÒÔ¼°¸´Óù¦ÄÜʱÖÓ

//USART3 _TX   PA.9

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö

    GPIO_Init(GPIOA, &GPIO_InitStructure);

 

    //USART1_RX   PA.10

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë

    GPIO_Init(GPIOA, &GPIO_InitStructure);

 

   //Usart3 NVIC ÅäÖÃ

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//ÇÀÕ¼ÓÅÏȼ¶1

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //×ÓÓÅÏȼ¶0

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;      //IRQͨµÀʹÄÜ

NVIC_Init(&NVIC_InitStructure);                          //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯VIC¼Ä´æÆ÷

 

 

   //USART ³õʼ»¯ÉèÖÃ

 

USART_InitStructure.USART_BaudRate = 115200;//Ò»°ãÉèÖÃΪ115200;

USART_InitStructure.USART_WordLength


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