#include <stdio.h> /*±ê׌ÊäÈëÊä³ö¶šÒå*/
#include <stdlib.h> /*±ê׌º¯Êý¿â¶šÒå*/
#include <unistd.h> /*Unix±ê׌º¯Êý¶šÒå*/
#include <sys/types.h> /**/
#include <sys/stat.h> /**/
#include <fcntl.h> /*ÎÄŒþ¿ØÖƶšÒå*/
#include <termios.h> /*PPSIXÖն˿ØÖƶšÒå*/
#include <errno.h> /*ŽíÎóºÅ¶šÒå*/
/***@brief ÉèÖÃŽ®¿ÚÍšÐÅËÙÂÊ
*@param fd ÀàÐÍ int Žò¿ªŽ®¿ÚµÄÎÄŒþŸä±ú
*@param speed ÀàÐÍ int Ž®¿ÚËÙ¶È
*@return void*/
#define TRUE 1
#define FALSE 0
#define MAX_MESSAGE 100
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,};
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);
}
}
/**
*@brief ÉèÖÃŽ®¿ÚÊýŸÝλ£¬Í£Ö¹Î»ºÍЧÑéλ
*@param fd ÀàÐÍ int Žò¿ªµÄŽ®¿ÚÎÄŒþŸä±ú*
*@param databits ÀàÐÍ int ÊýŸÝλ È¡Öµ Ϊ 7 »òÕß8*
*@param stopbits ÀàÐÍ int ֹͣλ ȡֵΪ 1 »òÕß2*
*@param parity ÀàÐÍ int ЧÑéÀàÐÍ È¡ÖµÎªN,E,O,,S
*/
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) { /*ÉèÖÃÊýŸÝλÊý*/
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); /* ÉèÖÃΪÆæЧÑé*/
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'e':
case 'E':
options.c_cflag |= PARENB; /* Enable parity */
options.c_cflag &= ~PARODD; /* ת»»ÎªÅŒÐ§Ñé*/
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);
}
/* ÉèÖÃֹͣλ*/
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;
options.c_cc[VTIME] = 150; // 15 seconds
options.c_cc[VMIN] = 0;
tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0) {
perror("SetupSerial 3");
return(FALSE);
}
return(TRUE);
}
/**
*@breif Žò¿ªŽ®¿Ú
*/
int OpenDev(char *Dev)
{
int fd = open( Dev, O_RDWR ); //| O_NOCTTY | O_NDELAY
if (-1 == fd) { /*ÉèÖÃÊýŸÝλÊý*/
perror("Can't Open Serial Port");
return -1;
} else
return fd;
}
int SendData(int fd,char *str)
{
//auto add the crlf
char strbuf[1000];
strcpy(strbuf, str);
strcat(strbuf, "\r\n");
write(fd, strbuf, strlen(strbuf));
//printf("Send: <%s>\n", strbuf);
}
/**
*@breif main()
*/
int main(int argc, char **argv)
{
int fd;
int nread;
char buff[512];
char bufftemp[512];
char *dev ="/dev/ttyS0";
fd = OpenDev(dev);
if (fd>0)
set_speed(fd,9600);
else {
printf("Can't Open Serial Port!\n");
exit(0);
}
if (set_Parity(fd,8,1,'N')== FALSE) {
printf("Set Parity Error\n");
exit(1);
}
/*
while (1) {
int count =0;
while (1)
{
nread = 0;
nread = read(fd,bufftemp,MAX_MESSAGE);
memcpy(&buff[count],bufftemp,nread);
count+=nread;
if(count ==MAX_MESSAGE)
break;
else if(count>MAX_MESSAGE)
{
printf("strange! receive > send \n");
break;
}
}
//printf("\nLen %d\n",nread);
buff[count]='\0';
printf("\r\nRecv: <%s>\n",buff);
}
*/
while (1)
{
memset(buff,0x0, MAX_MESSAGE);
if((nread = read(fd,buff,MAX_MESSAGE))>0)
{
write(fileno(stdout),buff,nread);
strcpy(buff,"OK");
write(fd,buff,3);
}
}
close(fd);
exit(0);
}
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