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https://git.code.sf.net/p/fuse-emulator/fuse
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94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
/* loader.c: loader detection
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Copyright (c) 2006 Philip Kendall
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$Id$
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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Author contact information:
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E-mail: philip-fuse@shadowmagic.org.uk
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*/
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#include "loader.h"
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#include "settings.h"
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#include "spectrum.h"
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#include "tape.h"
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#include "z80/z80.h"
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static int successive_reads = 0;
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static libspectrum_signed_dword last_tstates_read = -100000;
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static libspectrum_byte last_b_read = 0x00;
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void
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loader_frame( libspectrum_dword frame_length )
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{
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if( last_tstates_read > -100000 ) {
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last_tstates_read -= frame_length;
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}
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}
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void
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loader_tape_play( void )
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{
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successive_reads = 0;
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}
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void
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loader_tape_stop( void )
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{
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successive_reads = 0;
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}
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void
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loader_detect_loader( void )
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{
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libspectrum_dword tstates_diff = tstates - last_tstates_read;
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libspectrum_byte b_diff = z80.bc.b.h - last_b_read;
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last_tstates_read = tstates;
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last_b_read = z80.bc.b.h;
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if( settings_current.detect_loader ) {
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if( tape_is_playing() ) {
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if( tstates_diff > 1000 || ( b_diff != 1 && b_diff != 0xff ) ) {
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successive_reads++;
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if( successive_reads >= 2 ) {
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tape_stop();
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}
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} else {
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successive_reads = 0;
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}
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} else {
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if( tstates_diff <= 500 && ( b_diff == 1 || b_diff == 0xff ) ) {
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successive_reads++;
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if( successive_reads >= 10 ) {
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tape_do_play( 1 );
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}
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} else {
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successive_reads = 0;
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}
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}
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} else {
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successive_reads = 0;
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}
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}
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