main.c

嵌入式LINUX下串口编程,适用于PC104板卡的驱动

#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <fcntl.h>
#include <asm/io.h>

#define DATA_LENGTH	9
#define ISR 2
#define LSR 5
#define IER 1
#define FCR 2
#define BASEADDR 0x200

int main(int argc,char *argv[])
{
	int fd,res;
	int i,portnum;
	unsigned char txbuf[255],rxbuf[2000];
        unsigned char DataISR,DataLSR,DataIER,tmp;
	if(argc < 2) {
		perror("You don't input parameters!\n");
		return(-1);
	}

	if((fd = open(argv[1],O_RDWR|O_NONBLOCK)) <= 0) {
		perror("Open operation error!\n");
		return fd;
	}
        portnum=atoi(argv[2]);
        if (ioperm(BASEADDR+portnum*8,8,1)==-1)
           printf("the %d ioperm port failed \n",i);

	txbuf[0] = 0x01;
	txbuf[1] = 0x83;
	txbuf[2] = 0x04;
	txbuf[3] = 0xff;
	txbuf[4] = 0xff;
	txbuf[5] = 0x3f;
	txbuf[6] = 0x00;
	txbuf[7] = 0xef;
	txbuf[8] = 0x27;

	while(1) {
                 for(i=0;i<255;i++) {
                         rxbuf[i] = 0;
                 }
                 
		if(res = write(fd,txbuf,9) != 9) {
			perror("Write failed.\n");
			continue;
		}

		printf("TX: ");
		for(i=0;i<DATA_LENGTH;i++) {
			printf("%02x ",txbuf[i]);
		}
		printf("\n");
                usleep(200000);
                DataISR=inb(BASEADDR+portnum*8+ISR);
                DataIER=inb(BASEADDR+portnum*8+IER);
                DataLSR=inb(BASEADDR+portnum*8+LSR);
                printf("ISR=%02x IER=%02x LSR=%02x\n",DataISR,DataIER,DataLSR);//inb(BASEADDR+portnum*8+ISR),
                      // inb(BASEADDR+portnum*8+IER),inb(BASEADDR+portnum*8+LSR));
                      
               if ((DataISR&0x0c)==0x0c) {getchar();outb(0x0c,BASEADDR+portnum*8+FCR);}
		

		printf("RX: ");
		if(res = read(fd,rxbuf,3) <= 0) {
			perror("Receive 1nd failed.\n");
			continue;
		}
		if(res = read(fd,&rxbuf[3],rxbuf[2]+2) <= 0) {
			perror("Receive 2nd failed.\n");
			continue;
		}

		for(i=0;i<rxbuf[2]+5;i++) {
			printf("%02x ",rxbuf[i]);
		}
		printf("\n");


	}

	close(fd);
        if (ioperm(BASEADDR+portnum*8,8,0))
	return EXIT_SUCCESS;
}