Mercurial > repos > blastem

comparison cdd_mcu.c @ 2081:cfd53c94fffb

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial stab at RF5C164 emulation
author Michael Pavone <pavone@retrodev.com>
date Thu, 03 Feb 2022 23:15:42 -0800
parents bafb757e1cd2
children c9d3b8e1ea56
comparison
equal deleted inserted replaced
2080:bafb757e1cd2 2081:cfd53c94fffb
75 //TODO: more realistic seeking behavior 75 //TODO: more realistic seeking behavior
76 if (context->seeking) { 76 if (context->seeking) {
77 if (context->seek_pba == context->head_pba) { 77 if (context->seek_pba == context->head_pba) {
78 context->seeking = 0; 78 context->seeking = 0;
79 } else if (context->seek_pba > context->head_pba) { 79 } else if (context->seek_pba > context->head_pba) {
80 if (context->seek_pba - context->head_pba >= COARSE_SEEK) { 80 if (context->seek_pba - context->head_pba >= COARSE_SEEK || context->head_pba < LEADIN_SECTORS) {
81 context->head_pba += COARSE_SEEK; 81 context->head_pba += COARSE_SEEK;
82 } else if (context->seek_pba - context->head_pba >= FINE_SEEK) { 82 } else if (context->seek_pba - context->head_pba >= FINE_SEEK) {
83 context->head_pba += FINE_SEEK; 83 context->head_pba += FINE_SEEK;
84 } else { 84 } else {
85 context->head_pba++; 85 context->head_pba++;
117 { 117 {
118 case DS_PLAY: 118 case DS_PLAY:
119 handle_seek(context); 119 handle_seek(context);
120 if (!context->seeking) { 120 if (!context->seeking) {
121 context->head_pba++; 121 context->head_pba++;
122 }
123 if (context->head_pba >= LEADIN_SECTORS) {
122 uint8_t track = context->media->seek(context->media, context->head_pba - LEADIN_SECTORS); 124 uint8_t track = context->media->seek(context->media, context->head_pba - LEADIN_SECTORS);
123 if (context->media->tracks[track].type == TRACK_AUDIO) { 125 if (context->media->tracks[track].type == TRACK_AUDIO) {
124 gate_array[GAO_CDD_CTRL] &= ~BIT_MUTE; 126 gate_array[GAO_CDD_CTRL] &= ~BIT_MUTE;
125 } 127 }
126 } 128 }
469 next_subcode = context->cycle + SECTOR_CLOCKS; 471 next_subcode = context->cycle + SECTOR_CLOCKS;
470 update_status(context, gate_array); 472 update_status(context, gate_array);
471 next_nibble = context->cycle; 473 next_nibble = context->cycle;
472 context->current_status_nibble = 0; 474 context->current_status_nibble = 0;
473 gate_array[GAO_CDD_STATUS] |= BIT_DRS; 475 gate_array[GAO_CDD_STATUS] |= BIT_DRS;
474 if (context->status == DS_PLAY && !context->seeking) { 476 if (context->status == DS_PLAY && context->head_pba >= LEADIN_SECTORS) {
475 context->current_sector_byte = 0; 477 context->current_sector_byte = 0;
476 } 478 }
477 } 479 }
478 if (context->cycle >= next_nibble) { 480 if (context->cycle >= next_nibble) {
479 if (context->current_status_nibble == sizeof(cdd_status)) { 481 if (context->current_status_nibble == sizeof(cdd_status)) {