#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <stdlib.h>
#define TRUE 1
#define FALSE 0
int OpenDev(char *Dev);
void set_speed(int fd, int speed);
int set_Parity(int fd,int databits,int stopbits,int parity);
int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300, B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, };
int OpenDev(char *Dev)
{
int fd = open(Dev,O_RDWR | O_NOCTTY | O_NONBLOCK);
if(-1 == fd)
{
perror("Can't Open Serial Port");
return -1;
}
else
{
printf("Opened\n");
return fd;
}
}
int uart_send( int fd, char *str)
{
int wr_num;
char buf[1024];
sprintf(buf, "%s", str);
printf("a:%s\na_sptf:%s\n",str,buf);
wr_num = write(fd,str,strlen(buf));
//close(fd);
if(wr_num=1)
{puts("sent");}
else{puts("send failed");}
return wr_num;
}
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]);
status = tcsetattr(fd, TCSANOW, &Opt);
if (status != 0) perror("tcsetattr fd1");
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);
}
bzero(&options,sizeof(options));
options.c_cflag |= CLOCAL | CREAD;
options.c_cflag &= ~CSIZE;
switch (databits)
{
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;
options.c_iflag &= ~INPCK;
break;
case 'o':
case 'O':
options.c_cflag |= (PARODD | PARENB);
options.c_iflag |= (INPCK | ISTRIP);
break;
case 'e':
case 'E':
options.c_cflag |= PARENB;
options.c_cflag &= ~PARODD;
options.c_iflag |= (INPCK | ISTRIP);
break;
case 'S':
case 's':
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
break;
default: fprintf(stderr,"Unsupported parity\n");
return (FALSE);
}
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);
}
if (parity != 'n')
options.c_iflag |= INPCK;
options.c_cc[VTIME] = 0;
options.c_cc[VMIN] = 0;
tcflush(fd,TCIFLUSH);
if (tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (TRUE);
}
void main(int argc, char **argv)
{
int fd;
int nread;
char* a =argv[1];
char buff[255];
char *dev_name = "/dev/ttyUSB0";
int i=0;
while(i<3)
{ i++;
fd = OpenDev(dev_name);
if(fd>0)
set_speed(fd,9600);
else
{
printf("Can't Open Serial Port!\n");
sleep(1);
continue;
}
break;
}
if(set_Parity(fd,8,1,'N')==FALSE)
{
printf("Set Parity Error\n");
exit(1);
}
int j=0;
while(j<3)
{ j++;
sleep(3);
uart_send(fd,a);
printf("sent:%s\n",a);
nread = read(fd,buff,sizeof(buff));
if((nread>0))
{
//sprintf(buff, "%s", buff);
printf("read success\n%s\n%c\n",buff,buff[0]);
}
else{puts("read failed");}
}
}
