linux原生串口开发

news2024/11/20 0:41:26

1.在linux环境下封装串口相关代码

（1）vi uartTool.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "wiringSerial.h"

int myserialOpen (const char *device, const int baud)
{
	struct termios options ;
	speed_t myBaud ;
	int status, fd ;
	switch (baud){
	case 9600: myBaud = B9600 ; break ;
	case 115200: myBaud = B115200 ; break ;
	}
	if ((fd = open (device, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK)) == -1)
	return -1 ;
	fcntl (fd, F_SETFL, O_RDWR) ;
	// Get and modify current options:
	tcgetattr (fd, &options) ;
	cfmakeraw (&options) ;
	cfsetispeed (&options, myBaud) ;
	cfsetospeed (&options, myBaud) ;
	options.c_cflag |= (CLOCAL | CREAD) ;
	options.c_cflag &= ~PARENB ;
	options.c_cflag &= ~CSTOPB ;
	options.c_cflag &= ~CSIZE ;
	options.c_cflag |= CS8 ;
	options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG) ;
	options.c_oflag &= ~OPOST ;
	options.c_cc [VMIN] = 0 ;
	options.c_cc [VTIME] = 100 ; // Ten seconds (100 deciseconds)
	tcsetattr (fd, TCSANOW, &options) ;
	ioctl (fd, TIOCMGET, &status);
	status |= TIOCM_DTR ;
	status |= TIOCM_RTS ;
	ioctl (fd, TIOCMSET, &status);
	usleep (10000) ; // 10mS
	return fd ;
}

void serialSendstring (const int fd, const char *s)
{
	int ret;
	ret = write (fd, s, strlen (s));
	if (ret < 0)
	printf("Serial Puts Error\n");
}
int serialGetstring (const int fd, char *buffer)
{
	int n_read;
	n_read = read(fd, buffer,32);
	return n_read;
}

（2）vi uartTest.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <pthread.h>
#include "uartTool.h"

int fd;

void* readSerial()
{
	char buffer[32];	
	while(1){
		memset(buffer,'\0',sizeof(buffer));
		serialGetstring(fd, buffer);
		printf("GET->%s\n",buffer);
	}
}
void* sendSerial()
{
	char buffer[32];
	while(1){
		memset(buffer,'\0',sizeof(buffer));
		scanf("%s",buffer);
		serialSendstring(fd, buffer);
	}
}
int main(int argc, char **argv)
{
	char deviceName[32] = {'\0'};
	pthread_t readt;
	pthread_t sendt;
	
	if(argc < 2){
		printf("uage:%s /dev/ttyS?\n",argv[0]);
		return -1;
	}
	strcpy(deviceName, argv[1]);
	if( (fd = myserialOpen(deviceName, 115200)) == -1){
		printf("open %s error\n",deviceName);
		return -1;
	}
	pthread_create(&readt, NULL, readSerial,NULL);
	pthread_create(&sendt, NULL, sendSerial,NULL);
	while(1){sleep(10);}
}

（3）vi uartTool.h

int myserialOpen (const char *device, const int baud);
void serialSendstring (const int fd, const char *s);
int serialGetstring (const int fd, char *buffer);

2.开发板接线和共地图示（根据原理图）