linux 串口驱动测试代码

#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>

#define FALSE -1

#define TRUE 0

int speed_arr[] = { B115200, B57600, B38400, B19200, B9600, B4800, B2400, B1200, B300, };

int name_arr[] = {115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 300, };

unsigned char SetBaud_115200[14];

void set_speed(int fd, int speed)

{

int i;

int status;

struct termios Opt;

tcgetattr(fd, &Opt);

for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++)

{

if (speed == name_arr[i])

{

tcflush(fd, TCIOFLUSH);

cfsetispeed(&Opt, speed_arr[i]);

cfsetospeed(&Opt, speed_arr[i]);

//printf("set baud:%d\n", name_arr[i]);

//用于设置终端的相关参数

status = tcsetattr(fd, TCSANOW, &Opt); //TCSANOW：不等数据传输完毕就立即改变属性

if (status != 0)

{

perror("tcsetattr fd");

return;

}

tcflush(fd,TCIOFLUSH);

}

}

}

int set_Parity(int fd,int databits,int stopbits,int parity)

{

struct termios options;

if ( tcgetattr( fd,&options) != 0)

{

perror("SetupSerial 1");

return(FALSE);

}

options.c_cflag &= ~CSIZE;

switch (databits) /*设置数据位数*/

{

case 7:

options.c_cflag |= CS7;

break;

case 8:

options.c_cflag |= CS8;

break;

default:

fprintf(stderr,"Unsupported data size\n"); return (FALSE);

}

switch (parity)

{

case 'n':

case 'N':

options.c_cflag &= ~PARENB; /* Clear parity enable */

options.c_iflag &= ~INPCK; /* Enable parity checking */

break;

case 'o':

case 'O':

options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/

options.c_iflag |= INPCK; /* Disnable parity checking */

break;

case 'e':

case 'E':

options.c_cflag |= PARENB; /* Enable parity */

options.c_cflag &= ~PARODD; /* 转换为偶效验*/

options.c_iflag |= INPCK; /* Disnable parity checking */

break;

case 'S':

case 's': /*as no parity*/

options.c_cflag &= ~PARENB;

options.c_cflag &= ~CSTOPB;break;

default:

fprintf(stderr,"Unsupported parity\n");

return (FALSE);

}

/* 设置停止位*/

switch (stopbits)

{

case 1:

options.c_cflag &= ~CSTOPB;

break;

case 2:

options.c_cflag |= CSTOPB;

break;

default:

fprintf(stderr,"Unsupported stop bits\n");

return (FALSE);

}

/* Set input parity option */

if (parity != 'n')

options.c_iflag |= INPCK;

tcflush(fd,TCIOFLUSH);

options.c_cc[VTIME] = 50; /* 设置超时5 seconds*/

options.c_cc[VMIN] = 0; /* Update the options and do it NOW */

options.c_cc[VINTR] = 0; /**//* Ctrl-c */

options.c_cc[VQUIT] = 0; /**//* Ctrl- */

options.c_cc[VERASE] = 0; /**//* del */

options.c_cc[VKILL] = 0; /**//* @ */

options.c_cc[VEOF] = 0; /**//* Ctrl-d */

options.c_cc[VSWTC] = 0; /**//* '' */

options.c_cc[VSTART] = 0; /**//* Ctrl-q */

options.c_cc[VSTOP] = 0; /**//* Ctrl-s */

options.c_cc[VSUSP] = 0; /**//* Ctrl-z */

options.c_cc[VEOL] = 0; /**//* '' */

options.c_cc[VREPRINT] = 0; /**//* Ctrl-r */

options.c_cc[VDISCARD] = 0; /**//* Ctrl-u */

options.c_cc[VWERASE] = 0; /**//* Ctrl-w */

options.c_cc[VLNEXT] = 0; /**//* Ctrl-v */

options.c_cc[VEOL2] = 0; /**//* '' */

options.c_cflag |= (CLOCAL | CREAD); //忽略DCD信号

options.c_cflag &= ~CRTSCTS; //关硬件流控制

options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); //关回显

options.c_oflag &= ~OPOST; //行式输出

options.c_iflag &= ~(IXON | IXOFF | IXANY); //关软件流控制

if (tcsetattr(fd,TCSANOW,&options) != 0)

{

perror("SetupSerial 3");

return (FALSE);

}

return (TRUE);

}

int OpenDev(char *Dev)

{

int fd = open( Dev, O_RDWR | O_NOCTTY); //| O_NOCTTY | O_NDELAY

if (-1 == fd)

{

perror("Can't Open Serial Port");

return -1;

}

else

return fd;

}

int main(int argc, char **argv)

{

int uart_fd;

int nread, nwrite;

int num = 0;

char rev_char[128];

char rev_buf[128];

char *buff="hello! this is a serial test program,if you can see this,you success!\n";

char *dev = "/dev/ttyAMA2"; //串口二

uart_fd = OpenDev(dev); //打开设备

set_speed(uart_fd, 9600); //设置波特率

if (set_Parity(uart_fd,8,1,'n') == FALSE) //数据位，停止位，校验位

{

printf("Set Parity Error\n");

exit (0);

}

while(nread = read(uart_fd, rev_char, 1)) //读返回值

{

rev_buf[num++] = rev_char[0];

if (rev_char[0] == '\n')

{

rev_buf[num] = '\0';

num = 0;

printf("%s", rev_buf);

}

printf("%s", rev_buf);

if((nwrite = write(uart_fd,buff,strlen(buff)))>0)

{

printf("%s\n",buff);

}

}

if (nread == 0)

printf("No DATE!\n");

}

close(uart_fd);

}