uart.c

这是在Vxworks下调试通过的串口程序

#include <ioLib.h>
#include <stdio.h>
#include <taskLib.h>
#include <semLib.h>

char szBuf[8]={0};

int recid;

int tyRecv( int fd ) /*read has the function of waiting for data*/
{
	 	
	FOREVER
	{	
            if(read(fd,szBuf,1)!=NULL)
               write(fd,szBuf,1);
        }
}

int uart()
{
/* Open COM1*/

	int fd = open("/tyCo/0",O_RDWR,0); 
	
	if (ERROR==fd)
	{
		printf("can not open device!\n"); 
		return 0;
	}
	
/*Set baudrate*/
	
	if ( ERROR==ioctl(fd,FIOBAUDRATE,9600) )
	{
		printf("can not set BAUDRATE!\n"); 
		return 0; 
	}	
/*Start receiving task*/
	
	recid=taskSpawn("trecv",60,VX_FP_TASK,
		1024*40,(FUNCPTR)tyRecv,fd,
		0,0,0,0,0,0,0,0,0);	
}