ttytest.c

串口程序 embedded linux C program

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rs232.h"
main(int argc, char *argv[])
{

	int ret,portno,nWritten,nRead;
	char buf[256];
	portno=0;
	while(1)
	{
		ret=OpenCom(portno,"/dev/ttyS0",4800);
		if(ret==-1)
		{
			perror("The /dev/ttyS0 open error.");
			exit(1);
		}
		//nWritten=ComWrt(portno,"abcdefghijklmnopqrstuvwxyz",26);
		//printf("/dev/ttyS1 has send %d chars!\n",nWritten);
		//printf("\nRecieving data!************************************");
		fflush(stdout);
		nRead=ComRd(0,buf,256,3000);
		if(nRead < 0)
			printf("Timeout\n");
		if((ret=CloseCom(portno)==-1))
		{
			perror("Close com");
			exit(1);
		}
	}
	printf("Exit now.\n");
	return;
}