摘要：
1.開啟串列埠函式open_port()中要實現的函式：
(1)open("/dev/ttys0",o_rdwr | o_noctty | o_ndelay);/*開啟串列埠0*/
(2)fcntl(fd,f_setfl,0)/*恢復串列埠為阻塞狀態*/
(3)isatty(stdin_fileno) /*測試是否為中斷裝置 非0即是中斷裝置*/
2.配置串列埠引數函式set_opt()中要實現的函式:
(1)儲存原先有串列埠配置
tcgetattr(fd,&oldtio);
(2)先將新串列埠配置清0
bzore(&newtio,sizeof(newito));
(3)啟用選項clocal和cread 並設定資料位大小
newtio.c_cflag |=clocal | cread;
newtio.c_cflag &= ~csize;
newtio.c_cflag |=cs8;
(4)設定奇偶校驗
奇校驗:
newtio.c_cflag |= parenb;
newtio.c_cflag |= parodd;
newtio.c_iflag |= (inpck | istrip);
偶校驗:
newtio.c_iflag |= (inpck | istrip);
newtio.c_cflag |= parend;
newtio.c_cflag &= ~parodd;
無奇偶校驗：
newtio.c_cflag &= ~parenb;
(5) 設定停止位
newtio.c_cflag &= ~cstopb; /*停止位為1*/
newtio.c_cflag |= cstopb;/*停止位為0*/
(6)設定波特率:
cfsetispeed(&newtio,b115200);
cfsetospeed(&newtio,b115200);
(7)設定等待時間和最小接受字元:
newtio.c_cc[vtime] = 0;
newtio.c_cc[vmin] = 0;
(8)處理為接收字元:
tcflush(fd,tciflush);
(9)啟用新配置:
tcsetattr(fd,tcsanow,&newtio);
3.讀寫串列埠
write(fd,buff,8);
read(fd,buff,8);
例程：#include
#include
#include
#include
#include
#include
#include
#include
#include
int set_opt(int fd,int nspeed, int nbits, char nevent, int nstop)
bzero( &newtio, sizeof( newtio ) );
newtio.c_cflag |= clocal | cread;
newtio.c_cflag &= ~csize;
switch( nbits )
switch( nevent )
switch( nspeed )
if( nstop == 1 )
newtio.c_cflag &= ~cstopb;
else if ( nstop == 2 )
newtio.c_cflag |= cstopb;
newtio.c_cc[vtime] = 0;
newtio.c_cc[vmin] = 0;
tcflush(fd,tciflush);
if((tcsetattr(fd,tcsanow,&newtio))!=0)
printf("set done!\n");
return 0;
}int open_port(int fd,int comport)
;long vdisable;
if (comport==1)
else
printf("open ttys0 .....\n");
}else if(comport==2)
else
printf("open ttys1 .....\n");
}else if (comport==3)
else
printf("open ttys2 .....\n");
}if(fcntl(fd, f_setfl, 0)<0)
printf("fcntl failed!\n");
else
printf("fcntl=%d\n",fcntl(fd, f_setfl,0));
if(isatty(stdin_fileno)==0)
printf("standard input is not a terminal device\n");
else
printf("isatty success!\n");
printf("fd-open=%d\n",fd);
return fd;
}int main(void)
if((i=set_opt(fd,115200,8,'n',1))<0)
printf("fd=%d\n",fd);
// fd=3;
nread=read(fd,buff,8);
printf("nread=%d,%s\n",nread,buff);
close(fd);
return;
我自己的程式：
#ifndef _com_h
#define _com_h
#include
#include
#include
#include
#include
#include
#include
#include
#include
int set_opt(int fd,int nspeed, int nbits, char nevent, int nstop);
int open_port(int fd,int comport);
unsigned char uart_cmd(unsigned char *buffer,int tx, int rx);
#endif
/#include "com.h"
//使用開發板的con2(con0,con1,con2)
int set_opt(int fd,int nspeed, int nbits, char nevent, int nstop)
bzero( &newtio, sizeof( newtio ) );
newtio.c_cflag |= clocal | cread;
newtio.c_cflag &= ~csize;
newtio.c_oflag &= ~(onlcr | ocrnl); //
newtio.c_iflag &= ~(ixon | ixoff | ixany); //
switch( nbits )
switch( nevent )
switch( nspeed )
if( nstop == 1 )
newtio.c_cflag &= ~cstopb;
else if ( nstop == 2 )
newtio.c_cflag |= cstopb;
newtio.c_cc[vtime] =5; //測試時該大一點
newtio.c_cc[vmin] = 0;//set min read byte!
tcflush(fd,tciflush);
if((tcsetattr(fd,tcsanow,&newtio))!=0)
printf("set done!\n");
return 0;
}int open_port(int fd,int comport)
;long vdisable;
if (comport==1)
else
printf("open ttysac0 .....\n");
}else if(comport==2)
else
printf("open ttysac1 .....\n");
}else if (comport==3)
else
printf("open ttysac2 .....\n");
}if(fcntl(fd, f_setfl, 0)<0)
printf("fcntl failed!\n");
else
printf("fcntl=%d\n",fcntl(fd, f_setfl,0));
if(isatty(stdin_fileno)==0)
printf("standard input is not a terminal device\n");
else
printf("isatty success!\n");
printf("fd-open=%d\n",fd);
return fd;
}//我的應用函式
unsigned char uart_cmd(unsigned char *buffer,int tx, int rx)
if(( i=set_opt(fd,115200,8,'n',1) ) < 0)
if(( nwrite=write(fd,buffer,tx)) != tx)
printf("nwrite=%d\n",nwrite);
for(i=0;i
strncpy(buffer,mybuffer,rx+1);
close(fd);
return 0;
}
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