ºìÁªLinuxÃÅ»§
Linux°ïÖú

LinuxÏ´®¿Ú±à³ÌÈëÃŽ̳Ì

·¢²¼Ê±¼ä:2005-11-24 00:46:02À´Ô´:ºìÁª×÷Õß:yy123
¼ò½é£º

Linux ²Ù×÷ϵͳ´ÓÒ»¿ªÊ¼¾Í¶Ô´®ÐпÚÌṩÁ˺ܺõÄÖ§³Ö£¬±¾ÎÄ¾Í Linux ϵĴ®ÐпÚͨѶ±à³Ì½øÐмòµ¥µÄ½éÉÜ¡£

´®¿Ú¼ò½é

´®ÐпÚÊǼÆËã»úÒ»ÖÖ³£ÓõĽӿڣ¬¾ßÓÐÁ¬½ÓÏßÉÙ£¬Í¨Ñ¶¼òµ¥£¬µÃµ½¹ã·ºµÄʹÓᣳ£ÓõĴ®¿ÚÊÇ RS-232-C ½Ó¿Ú£¨ÓÖ³Æ EIA RS-232-C£©ËüÊÇÔÚ 1970 ÄêÓÉÃÀ¹úµç×Ó¹¤ÒµÐ­»á£¨EIA£©ÁªºÏ±´¶ûϵͳ¡¢ µ÷Öƽâµ÷Æ÷³§¼Ò¼°¼ÆËã»úÖÕ¶ËÉú²ú³§¼Ò¹²Í¬Öƶ¨µÄÓÃÓÚ´®ÐÐͨѶµÄ±ê×¼¡£ËüµÄÈ«ÃûÊÇ"Êý¾ÝÖÕ¶ËÉ豸£¨DTE£©ºÍÊý¾ÝͨѶÉ豸£¨DCE£©Ö®¼ä´®Ðжþ½øÖÆÊý¾Ý½»»»½Ó¿Ú¼¼Êõ±ê×¼"¸Ã±ê×¼¹æ¶¨²ÉÓÃÒ»¸ö 25 ¸ö½ÅµÄ DB25 Á¬½ÓÆ÷£¬¶ÔÁ¬½ÓÆ÷µÄÿ¸öÒý½ÅµÄÐźÅÄÚÈݼÓÒԹ涨£¬»¹¶Ô¸÷ÖÖÐźŵĵçƽ¼ÓÒԹ涨¡£´«Êä¾àÀëÔÚÂëÔª»û±äСÓÚ 4% µÄÇé¿öÏ£¬´«ÊäµçÀ³¤¶ÈӦΪ 50 Ó¢³ß¡£

Linux ²Ù×÷ϵͳ´ÓÒ»¿ªÊ¼¾Í¶Ô´®ÐпÚÌṩÁ˺ܺõÄÖ§³Ö£¬±¾ÎÄ¾Í Linux ϵĴ®ÐпÚͨѶ±à³Ì½øÐмòµ¥µÄ½éÉÜ£¬Èç¹ûÒª·Ç³£ÉîÈëÁ˽⣬½¨Òé¿´¿´±¾ÎÄËù²Î¿¼µÄ¡¶Serial Programming Guide for POSIX Operating Systems¡·
´®¿Ú²Ù×÷

´®¿Ú²Ù×÷ÐèÒªµÄÍ·Îļþ

#include /*±ê×¼ÊäÈëÊä³ö¶¨Òå*/
#include /*±ê×¼º¯Êý¿â¶¨Òå*/
#include /*Unix ±ê×¼º¯Êý¶¨Òå*/
#include
#include
#include /*Îļþ¿ØÖƶ¨Òå*/
#include /*PPSIX Öն˿ØÖƶ¨Òå*/
#include /*´íÎóºÅ¶¨Òå*/



´ò¿ª´®¿Ú

ÔÚ Linux Ï´®¿ÚÎļþÊÇλÓÚ /dev ϵġ£´®¿ÚÒ» Ϊ /dev/ttyS0£¬´®¿Ú¶þ Ϊ /dev/ttyS1¡£´ò¿ª´®¿ÚÊÇͨ¹ýʹÓñê×¼µÄÎļþ´ò¿ªº¯Êý²Ù×÷£º

int fd;
/*ÒÔ¶Áд·½Ê½´ò¿ª´®¿Ú*/
fd = open( "/dev/ttyS0", O_RDWR);
if (-1 == fd){
/* ²»ÄÜ´ò¿ª´®¿ÚÒ»*/
perror(" Ìáʾ´íÎó£¡");
}



ÉèÖô®¿Ú

×î»ù±¾µÄÉèÖô®¿Ú°üÀ¨²¨ÌØÂÊÉèÖã¬Ð§ÑéλºÍֹͣλÉèÖᣴ®¿ÚµÄÉèÖÃÖ÷ÒªÊÇÉèÖà struct termios ½á¹¹ÌåµÄ¸÷³ÉÔ±Öµ¡£

struct termio
{ unsigned short c_iflag; /* ÊäÈëģʽ±êÖ¾ */
unsigned short c_oflag; /* Êä³öģʽ±êÖ¾ */
unsigned short c_cflag; /* ¿ØÖÆģʽ±êÖ¾*/
unsigned short c_lflag; /* local mode flags */
unsigned char c_line; /* line discipline */
unsigned char c_cc[NCC]; /* control characters */
};



ÉèÖÃÕâ¸ö½á¹¹ÌåºÜ¸´ÔÓ£¬ÎÒÕâÀï¾Íֻ˵˵³£¼ûµÄһЩÉèÖãº

²¨ÌØÂÊÉèÖà ÏÂÃæÊÇÐ޸IJ¨ÌØÂʵĴúÂ룺

struct termios Opt;
tcgetattr(fd, &Opt);
cfsetispeed(&Opt,B19200); /*ÉèÖÃΪ19200Bps*/
cfsetospeed(&Opt,B19200);
tcsetattr(fd,TCANOW,&Opt);



ÉèÖò¨ÌØÂʵÄÀý×Óº¯Êý£º

/**
*@brief ÉèÖô®¿ÚͨÐÅËÙÂÊ
*@param fd ÀàÐÍ int ´ò¿ª´®¿ÚµÄÎļþ¾ä±ú
*@param speed ÀàÐÍ int ´®¿ÚËÙ¶È
*@return void
*/
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) {
tcflush(fd, TCIOFLUSH);
cfsetispeed(&Opt, speed_arr[i]);
cfsetospeed(&Opt, speed_arr[i]);
status = tcsetattr(fd1, TCSANOW, &Opt);
if (status != 0) {
perror("tcsetattr fd1");
return;
}
tcflush(fd,TCIOFLUSH);
}
}
}



ÉèÖÃЧÑéµÄº¯Êý£º

/**
*@brief ÉèÖô®¿ÚÊý¾Ýλ£¬Í£Ö¹Î»ºÍЧÑéλ
*@param fd ÀàÐÍ int ´ò¿ªµÄ´®¿ÚÎļþ¾ä±ú
*@param databits ÀàÐÍ int Êý¾Ýλ 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) /*ÉèÖÃÊý¾ÝλÊý*/
{
case 7:
options.c_cflag |= CS7;
break;
case 8:
options.c_cflag |= CS8;
break;
default:
fprintf(stderr,"Unsupported data sizen"); 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»»ÎªÅ¼Ð§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 parityn");
return (FALSE);
}
/* ÉèÖÃֹͣλ*/
switch (stopbits)
{
case 1:
options.c_cflag &= ~CSTOPB;
break;
case 2:
options.c_cflag |= CSTOPB;
break;
default:
fprintf(stderr,"Unsupported stop bitsn");
return (FALSE);
}
/* Set input parity option */
if (parity != 'n')
options.c_iflag |= INPCK;
tcflush(fd,TCIFLUSH);
options.c_cc[VTIME] = 150; /* ÉèÖó¬Ê±15 seconds*/
options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (TRUE);
}



ÐèҪעÒâµÄÊÇ: Èç¹û²»ÊÇ¿ª·¢ÖÕ¶ËÖ®ÀàµÄ£¬Ö»ÊÇ´®¿Ú´«ÊäÊý¾Ý£¬¶ø²»ÐèÒª´®¿ÚÀ´´¦Àí£¬ÄÇôʹÓÃԭʼģʽ(Raw Mode)·½Ê½À´Í¨Ñ¶£¬ÉèÖ÷½Ê½ÈçÏ£º

options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
options.c_oflag &= ~OPOST; /*Output*/



¶Áд´®¿Ú

ÉèÖúô®¿ÚÖ®ºó£¬¶Áд´®¿Ú¾ÍºÜÈÝÒ×ÁË£¬°Ñ´®¿Úµ±×÷Îļþ¶Áд¾ÍÊÇ¡£

?·¢ËÍÊý¾Ý

char buffer[1024];int Length;int nByte;nByte = write(fd, buffer ,Length)



?¶ÁÈ¡´®¿ÚÊý¾Ý

ʹÓÃÎļþ²Ù×÷readº¯Êý¶ÁÈ¡£¬Èç¹ûÉèÖÃΪԭʼģʽ(Raw Mode)´«ÊäÊý¾Ý£¬ÄÇôreadº¯Êý·µ»ØµÄ×Ö·ûÊýÊÇʵ¼Ê´®¿ÚÊÕµ½µÄ×Ö·ûÊý¡£¿ÉÒÔʹÓòÙ×÷ÎļþµÄº¯ÊýÀ´ÊµÏÖÒì²½¶ÁÈ¡£¬Èçfcntl£¬»òÕßselectµÈÀ´²Ù×÷¡£

char buff[1024];int Len;int readByte = read(fd,buff,Len);



¹Ø±Õ´®¿Ú

¹Ø±Õ´®¿Ú¾ÍÊǹرÕÎļþ¡£

close(fd);



Àý×Ó

ÏÂÃæÊÇÒ»¸ö¼òµ¥µÄ¶ÁÈ¡´®¿ÚÊý¾ÝµÄÀý×Ó£¬Ê¹ÓÃÁËÉÏÃ涨ÒåµÄһЩº¯ÊýºÍÍ·Îļþ

/**********************************************************************
´úÂë˵Ã÷£ºÊ¹Óô®¿Ú¶þ²âÊԵģ¬·¢Ë͵ÄÊý¾ÝÊÇ×Ö·û£¬
µ«ÊÇûÓз¢ËÍ×Ö·û´®½áÊø·ûºÅ£¬ËùÒÔ½ÓÊÕµ½ºó£¬ºóÃæ¼ÓÉÏÁ˽áÊø·ûºÅ¡£
ÎÒ²âÊÔʹÓõÄÊǵ¥Æ¬»ú·¢ËÍÊý¾Ýµ½µÚ¶þ¸ö´®¿Ú£¬²âÊÔͨ¹ý¡£
**********************************************************************/
#define FALSE -1
#define TRUE 0
/*********************************************************************/
int OpenDev(char *Dev)
{
int fd = open( Dev, O_RDWR );
//| 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 fd;
int nread;
char buff[512];
char *dev = "/dev/ttyS1"; //´®¿Ú¶þ
fd = OpenDev(dev);
set_speed(fd,19200);
if (set_Parity(fd,8,1,'N') == FALSE) {
printf("Set Parity Errorn");
exit (0);
}
while (1) //Ñ­»·¶ÁÈ¡Êý¾Ý
{
while((nread = read(fd, buff, 512))>0)
{
printf("nLen %dn",nread);
buff[nread+1] = '';
printf( "n%s", buff);
}
}
//close(fd);
// exit (0);
}

[[i] Last edited by yy123 on 2005-11-24 at 00:47
]
ÎÄÕÂÆÀÂÛ

¹²ÓÐ 21 ÌõÆÀÂÛ

  1. Á÷¶¯Ëæ·ç ÓÚ 2011-11-22 13:54:25·¢±í:

    ÖÕÓÚÕÒµ½´®¿ÚµÄһЩ½éÉÜÁË

  2. ai0909 ÓÚ 2011-11-01 14:19:42·¢±í:

    {:2_97:}

  3. Ê«ÔÏÑÛÀá ÓÚ 2011-03-23 09:15:25·¢±í:

    ÖµµÃѧϰ¡£¡£¡£¡£

  4. sybmv ÓÚ 2011-03-21 10:03:08·¢±í:

    ллlz

  5. ttlcmos ÓÚ 2011-02-25 23:32:08·¢±í:

    ºÃºÃѧϰÏ£¬Ð»Ð»Ìṩ£¡

  6. linuxlyy ÓÚ 2011-02-23 14:04:01·¢±í:

    xuexi le ...hao ..

  7. lulutiny ÓÚ 2011-02-22 21:51:02·¢±í:

    ºÃÌù

  8. chinalzd ÓÚ 2010-06-12 13:00:17·¢±í:

    ²î²»¶à°É£¬ÄÜÓ¦Óõ½Êµ¼ÊµÄ°²×°ÉÏô£¿

  9. westcb ÓÚ 2010-06-12 11:12:00·¢±í:

    Óе㷱Ëö

  10. worldeditor ÓÚ 2009-12-19 17:35:54·¢±í:

    ²»¶®£¬µ«ÊÇÒ»¶¨¶¥£¬ËѲØÁË

  11. uchiha ÓÚ 2009-12-19 17:33:33·¢±í:

    ºÃÉî°Âѽ

  12. namewchlp ÓÚ 2009-11-25 19:46:59·¢±í:

    ·Ç³£ºÃµÄÊé

  13. croosszzy ÓÚ 2009-11-24 12:18:21·¢±í:

    лл

  14. croosszzy ÓÚ 2009-11-24 11:44:03·¢±í:

    лл

  15. cyril008 ÓÚ 2009-11-18 22:24:39·¢±í:

    лл¥Ö÷·ÖÏí¹þ~

  16. cyril008 ÓÚ 2009-11-18 22:24:35·¢±í:

    good£¡£¡

  17. Bill_Hong ÓÚ 2009-11-13 17:45:20·¢±í:

    5# js001sdx


    ºÃÌù°¡

  18. js001sdx ÓÚ 2009-10-20 09:02:44·¢±í:

    ºÃÌù°¡

  19. hzg0304 ÓÚ 2009-10-19 17:10:27·¢±í:

    ¿´²»¶®£¬°¦£¡£¡£¡

  20. hkhantang ÓÚ 2009-10-05 09:21:31·¢±í:

    ¶àл£¡

  21. js001sdx ÓÚ 2009-09-29 09:16:13·¢±í:

    °ï¶¥