分类: LINUX
2011-01-07 17:10:17
好了CYGWIN和MAGIC C++ 3.0,运行 HELLO WORLD!也OK了,就想搞搞串口,以前LINUX服务器没有办法读写,因为没有设备,所以只是知道打开关闭OK,现在可以试一试了。
#include
#include
#include
#include
#include
#include
#include
#include
#include
设置串口通信速率
fd 类型 int 打开串口的文件句柄
speed 类型 int 串口速度
void*/
#define FALSE 0
#define TRUE 1
int speed_arr[] = &leftsign; B38400, B19200, B9600, B4800, B2400, B1200, B300,
B38400, B19200, B9600, B4800, B2400, B1200, B300, &rightsign;;
int name_arr[] = &leftsign;38400, 19200, 9600, 4800, 2400, 1200, 300,
38400, 19200, 9600, 4800, 2400, 1200, 300, &rightsign;;
void set_speed(int fd, int speed)
&leftsign;
int i;
int status;
struct termios Opt;
tcgetattr(fd, &Opt);
for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++)
&leftsign;
if (speed == name_arr[i])
&leftsign;
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;
&rightsign;
tcflush(fd,TCIOFLUSH);
&rightsign;
&rightsign;
/**
设置串口数据位,停止位和效验位
fd 类型 int 打开的串口文件句柄*
databits 类型 int 数据位 取值 为 7 或者8*
stopbits 类型 int 停止位 取值为 1 或者2*
parity 类型 int 效验类型 取值为N,E,O,,S
*/
int set_Parity(int fd,int databits,int stopbits,int parity)
&leftsign;
struct termios options;
if ( tcgetattr( fd,&options) != 0)
&leftsign;
perror("SetupSerial 1");
return(FALSE);
&rightsign;
options.c_cflag &= ~CSIZE;
switch (databits) /*设置数据位数*/
&leftsign;
case 7:
options.c_cflag &line;= CS7;
break;
case 8:
options.c_cflag &line;= CS8;
break;
default:
fprintf(stderr,"Unsupported da
return (FALSE);
&rightsign;
switch (parity)
&leftsign;
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 &line;= (PARODD &line; PARENB); /* 设置为奇效验*/
options.c_iflag &line;= INPCK; /* Disnable parity checking */
break;
case \’e\’:
case \’E\’:
options.c_cflag &line;= PARENB; /* Enable parity */
options.c_cflag &= ~PARODD; /* 转换为偶效验*/
options.c_iflag &line;= 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);
&rightsign;
/* 设置停止位*/
switch (stopbits)
&leftsign;
case 1:
options.c_cflag &= ~CSTOPB;
break;
case 2:
options.c_cflag &line;= CSTOPB;
break;
default:
fprintf(stderr,"Unsupported stop bits\\n");
return (FALSE);
&rightsign;
/* Set input parity option */
if (parity != \’n\’)
options.c_iflag &line;= 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)
&leftsign;
perror("SetupSerial 3");
return (FALSE);
&rightsign;
return (TRUE);
&rightsign;
/**
打开串口
*/
int OpenDev(char *Dev)
&leftsign;
int fd = open( Dev, O_RDWR ); //&line; O_NOCTTY &line; O_NDELAY
if (-1 == fd)
&leftsign; /*设置数据位数*/
perror("Can\’t Open Serial Port");
return -1;
&rightsign;
else
return fd;
&rightsign;
/* write the users command out the serial port */
int send_cmd(int ftty,char * str)
&leftsign;
int result;
result = write(ftty,str,strlen(str));/*argv[4], strlen(argv[4]));*/
if (result < 0)
&leftsign;
printf("Write command:%s to VC312 failed\\n",str);
close(ftty);
exit(1);
&rightsign;
&rightsign;
/**
main()
*/
int main(int argc, char **argv)
&leftsign;
int fd;
int nread;
char buff[512];
char *dev ="/dev/ttyS1";
fd = OpenDev(dev);
if (fd>0)
set_speed(fd,19200);
else
&leftsign;
printf("Can\’t Open Serial Port!\\n");
exit(0);
&rightsign;
if (set_Parity(fd,8,1,\’N\’)== FALSE)
&leftsign;
printf("Set Parity Error\\n");
exit(1);
&rightsign;
send_cmd(fd,"at\\r\\n");
//while(1)
int len=0;
&leftsign;
while((nread = read(fd,buff+len,100))>0)
&leftsign;
len+=nread;
//printf("\\nLen %d\\n",nread);
buff[len+1]=\’\\0\’;
//printf("\\n%s",buff);
&rightsign;
&rightsign;
printf("\\nLen %d\\n",len);
printf("\\n%s",buff);
close(fd);
exit(0);
&rightsign;
设置硬件流控制
一些版本的UNIX支持使用CTS(Clear to Send)和RTS(Requeut to send)信号线的硬件流量控制.如果你系统中定义了
CNEW_RTSCTS或者CRTSCTS常数,那么就可能支持硬件流量控制.以下可以激活硬件流量控制:
options.c_cflag &line;= CNEW_RTSCTS; /* also called CRTSCTS */
类似地可以这样关闭硬件流量控制:
options.c_cflag &= ~CNEW_RTSCTS;
设置软件流控制
软件流控制可以用IXON,IXOFF和IXANY常数来激活:
options.c_iflag &line;= (IXON &line; IXOFF &line; OXANY );
取消它仅需将那些位掩住:
options.c_iflag &= ~(IXON &line; IXOFF &line; OXANY );
termios.h 定义 :#define CRTSXOFF 0×04000 #define CRTSCTS 0×08000
chinaunix网友2011-03-08 17:42:47
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