testmode.c

at51系列单片机编程源码

/* ----------------------------------------------------------------------------
 * testmode.c
 * functions that switch the state of the signal lines for test the
 * wiring to the microcontroller.
 *
 * Copyright 2003/2004
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 * ----------------------------------------------------------------------------*/
#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include "isp-at89.h"

void
testmode (char *device)
{
	char mykey;
	char myloop = 1;
	unsigned char mydata = 0;
	unsigned char myread = 0;
	int fd;

	if ((fd = parport_gethandle(device)) != ERROR) {
		printf (_("\nTestmode:\n"));
		printf (_("=========\n\n"));

		printf (_("Connect PC and chip as follows:\n\n"));
		printf (_("Printer Port         ATMEL 89S8252\n"));
		printf ("Pin:6  (D4)  <---->  Pin:9  (RESET)\n");
		printf ("Pin:7  (D5)  <---->  Pin:6  (MOSI)\n");
		printf ("Pin:8  (D6)  <---->  Pin:8  (SCK)\n");
		printf ("Pin:10 (ACK) <---->  Pin:7  (MISO)\n");
		printf ("Pin:25 (GND) <---->  Pin:20 (GND)\n\n");

		printf (_("Press a key for toggling the state of the pin\n"));
		printf (_("or press <q> for exit the testmode.\n\n"));

#ifdef DEBUG
		printf("  DBG: Value of variable fd: %i\n", fd);
#endif

		while (myloop) {

			myread = parport_wdata (fd, mydata);

			/* Dump the state from the port */
			if (mydata & RESET)
				printf ("<R>ESET = 5V ");
			else
				printf ("<r>eset = 0V ");

			if (mydata & MOSI)
				printf ("M<O>SI = 5V ");
			else
				printf ("m<o>si = 0V ");

			if (mydata & SCK)
				printf ("<S>CK = 5V ");
			else
				printf ("<s>ck = 0V ");

			if (myread)
				printf ("M<I>SO = 5V\r");
			else
				printf ("m<i>so = 0V\r");

			/* Wait for a key */
			mykey = getchar();
			printf ("\r");

			switch (tolower(mykey)) {
				case 'r':
					mydata = mydata & RESET ? mydata & ~RESET : mydata | RESET;
					break;
				case 'o':
					mydata = mydata & MOSI ? mydata & ~MOSI : mydata | MOSI;
					break;
				case 's':
					mydata = mydata & SCK ? mydata & ~SCK : mydata | SCK;
					break;
				case 'q':
				case 'x':
					printf ("                                                  \n");
					myloop=0;
					break;
			}
		}
		printf ("\n");
		parport_release(fd);    /* clean up interface */
		close(fd);
	}
}