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
『本文转载自网络,版权归原作者所有,如有侵权请联系删除』