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/* Bytes receiver for send_byte.s from /usr/local/avr/lib/libc/send_byte.s
This program receive bytes from the ATMEL AVR chip connected to PC
parallel port.
For the connection scheme look to send_byte.s
Bugs: Hard coded parallel port 0x378. (Can be easy changed)
Copyright (C) 1998, 1999 by Denis Chertykov (denisc@overta.ru)
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, or (at your option)
any later version.
*/
#include <stdio.h>
#include <sys/io.h>
#include <unistd.h>
#include <linux/lp.h>
#include <signal.h>
#include <sys/time.h>
#define RECV_PORT_BASE 0x378
#define RD_PORT (inb (RECV_PORT_BASE+1))
#define SET_CLK (outb (LP_PINITP, RECV_PORT_BASE+2))
#define CLR_CLK (outb (LP_PSTROBE | LP_PINITP, RECV_PORT_BASE+2))
#define RESET_AVR {int k=20000;outb (LP_PSTROBE,RECV_PORT_BASE+2);while(--k) inb(RECV_PORT_BASE+1);outb (LP_PINITP,RECV_PORT_BASE+2);}
int
get_bit ()
{
int i,n=200;
while (!(RD_PORT & 0x20));
i = !!(RD_PORT & 0x80);
SET_CLK;
CLR_CLK;
return i;
}
int
get_byte1()
{
int i=0;
i = get_bit ();
i += get_bit () << 1;
i += get_bit () << 2;
i += get_bit () << 3;
i += get_bit () << 4;
i += get_bit () << 5;
i += get_bit () << 6;
i += get_bit () << 7;
return i;
}
int
get_byte()
{
int n = get_byte1 ();
if (n != 0x55)
{
fprintf (stderr, "sync error\n");
while (get_byte1()!=0x55)
get_bit();
}
return get_byte1();
}
int
main(int argc, char **argv)
{
if (ioperm (RECV_PORT_BASE, 8, 1) == 0)
{
RESET_AVR;
outb (0xff,RECV_PORT_BASE);
if (!(RD_PORT & 0x20))
CLR_CLK;
while (1)
{
if (argc >= 2)
printf ("%02x ", get_byte());
else
putchar (get_byte ());
fflush (stdout);
}
}
else
perror ("ioperm");
return 0;
}
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