avr/passtask.c

   1 /*
   2  * Copyright (C) 2007 Anton Blad
   3  * Copyright (C) 2007 Fredrik Kuivinen
   4  * Copyright (C) 2007 Jakob Rosén
   5  *
   6  * This file is licensed under GPL v2.
   7  */
   8
   9 #include "passtask.h"
  10 #include "fcpu.h"
  11 #include "c64tape.h"
  12 #include "motor.h"
  13 #include <avr/io.h>
  14 #include "trutcomm.h"
  15 #include <util/delay.h>
  16
  17 void passtask_init()
  18 {
  19 }
  20
  21 void passtask_setup()
  22 {
  23         // First clear the interrupt enable flags
  24         EIMSK &= ~(_BV(INT0) | _BV(INT1));
  25
  26         // Enable interrupts of both edges for taperead and c64write
  27         EICRA &= ~(_BV(ISC11));
  28         EICRA |= _BV(ISC10);
  29         EICRA &= ~(_BV(ISC01));
  30         EICRA |= _BV(ISC00);
  31
  32         // Clear possible interrupt flags
  33         EIFR |= (_BV(INTF1) | _BV(INTF0));
  34
  35         // Set the interrupt enable flags
  36         EIMSK |= (_BV(INT0) | _BV(INT1));
  37
  38         // Finally update the signals
  39         if(taperead_ison())
  40                 c64read_on();
  41         else
  42                 c64read_off();
  43
  44         if(tapesense_ison())
  45                 c64sense_on();
  46         else
  47                 c64sense_off();
  48
  49         if(c64write_ison())
  50                 tapewrite_on();
  51         else
  52                 tapewrite_off();
  53 }
  54
  55 void passtask_disable()
  56 {
  57         // Clear the interrupt enable flags
  58         EIMSK &= ~(_BV(INT0) | _BV(INT1));
  59 }
  60
  61 void passtask()
  62 {
  63         if(tapesense_ison())
  64                 c64sense_on();
  65         else
  66                 c64sense_off();
  67 }
  68
  69 // Interrupt handler for TAPEREAD
  70 ISR(INT0_vect)
  71 {
  72         if(taperead_ison())
  73                 c64read_on();
  74         else
  75                 c64read_off();
  76 }
  77
  78 // Interrupt handler for C64WRITE
  79 ISR(INT1_vect)
  80 {
  81         if(c64write_ison())
  82                 tapewrite_on();
  83         else
  84                 tapewrite_off();
  85 }