2019年10月23日 | stm32f103双串口收发（调试通过）

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 = 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(USART3, USART_IT_TXE, ENABLE);//ʹÄÜÖжÏ

    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//¿ªÆôÖжÏ

    USART_Cmd(USART3, ENABLE);                    //ʹÄÜ´®¿Ú

}

/* ***************************************ÖжϺ¯Êý ********************************************************/

#define TxBufferSize1 (countof(TxBuffer1)-1)

#define TxBufferSize2 (countof(TxBuffer2)-1)

#define TxBufferSize3 (countof(TxBuffer3)-1)

#define RxBufferSize1 (countof(TxBuffer1)-1)

#define RxBufferSize2 (countof(TxBuffer2)-1)

#define RxBufferSize3 (countof(TxBuffer3)-1)

#define countof(a) (sizeof(a)/sizeof(*(a)))      //±íʾÊý×éaÖеÄÔªËظöÊý

char TxBuffer1[27]="";

char TxBuffer2[27]="";

char TxBuffer3[27]="";

char RxBuffer1[RxBufferSize1];

char RxBuffer2[RxBufferSize2];

char RxBuffer3[RxBufferSize3];

__IO uint8_t TxCounter1 = 0;

__IO uint8_t TxCounter2 = 0;

__IO uint8_t TxCounter3 = 0;

__IO uint8_t RxCounter1 = 0;

__IO uint8_t RxCounter2 = 0;

__IO uint8_t RxCounter3 = 0;

uint8_t NbrOfDataToTransfer1 = TxBufferSize1;

uint8_t NbrOfDataToTransfer2 = TxBufferSize2;

uint8_t NbrOfDataToTransfer3 = TxBufferSize3;