Linux下串口编程

1、设置串口波特率

stty -F /dev/ttyPS1  speed 115200
dmesg | grep ttyS*   //查串口设备
echo 232 >> /dev/ttyPS1  //查看串口是否可用

2、测试代码

//可串口调试助手进行测试，可通过stty设置串口波特率

#include     <stdio.h>      /*标准输入输出定义*/
#include     <stdlib.h>     /*标准函数库定义*/
#include     <unistd.h>     /*Unix 标准函数定义*/
#include     <sys/types.h>  
#include     <sys/stat.h>   
#include     <fcntl.h>      /*文件控制定义*/
#include     <termios.h>    /*PPSIX 终端控制定义*/
#include     <errno.h>      /*错误号定义*/
#include 　　<string.h>

int main(void)
{

int fd;
char buf[50]={0};
char buf111[12]={0x01,0x09,0x30,0x34,0x35,0x44,0x42,0x35,0x33,0x41,0x46,0x0D};
char buf123[200]={0};
int len = 0;
int len1 = 0;
int i = 0;
int count =0;
struct termios termios_p;
fd = open("/dev/ttyPS1", O_RDWR | O_NOCTTY);

tcgetattr(fd, &termios_p);
termios_p.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
termios_p.c_oflag &= ~OPOST;
termios_p.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
termios_p.c_cflag &= ~(CSIZE | PARENB);
termios_p.c_cflag |= CS8;
tcsetattr(fd, TCSANOW, &termios_p);
printf("Line %d ", __LINE__);

while(1)
{

sleep(2);
write(fd, buf111, 12);

// goto out;
memset(buf, 0, sizeof(buf));
len =0;
len1 = 0;
while(len1 < 20)
{
len = read(fd, buf, 10);
if (len <= 0)
{

printf("read failed %d 0x%02x ", len, buf[0]);
//exit(-1);
continue;
}
memcpy(buf123+len1, buf, len);
len1 += len;
for(i =0; i< len; i++)
printf("%02x ", buf[i]);

}

printf("count %d ", count++);

out:
usleep(1000000);
}

}

参考文档： POSIX操作系统的串行编程指南

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