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comparison cdd_mcu.c @ 2130:28b6453cf7e3

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Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
author Michael Pavone <pavone@retrodev.com>
date Tue, 15 Mar 2022 08:58:04 -0700
parents ad346054ca78
children 11a3d5b00a66
comparison
equal deleted inserted replaced
2129:4c9e447aa25b 2130:28b6453cf7e3
541 //it's a little unclear if this gates the actual cd block clock or just handshaking 541 //it's a little unclear if this gates the actual cd block clock or just handshaking
542 //assum it's actually the clock for now 542 //assum it's actually the clock for now
543 for (; context->cycle < cd_cycle; context->cycle += CDD_MCU_DIVIDER) { 543 for (; context->cycle < cd_cycle; context->cycle += CDD_MCU_DIVIDER) {
544 if (context->cycle >= context->next_byte_cycle) { 544 if (context->cycle >= context->next_byte_cycle) {
545 cdd_fader_data(fader, 0); 545 cdd_fader_data(fader, 0);
546 lc8951_write_byte(cdc, cd_block_to_mclks(context->cycle), 0, 0);
546 context->next_byte_cycle += BYTE_CLOCKS; 547 context->next_byte_cycle += BYTE_CLOCKS;
547 } 548 }
548 } 549 }
549 gate_array[GAO_CDD_CTRL] |= BIT_MUTE; 550 gate_array[GAO_CDD_CTRL] |= BIT_MUTE;
550 return; 551 return;
629 if (context->current_sector_byte >= 0 && (!fader->byte_counter || context->current_sector_byte)) { 630 if (context->current_sector_byte >= 0 && (!fader->byte_counter || context->current_sector_byte)) {
630 uint8_t byte = context->media->read(context->media, context->current_sector_byte); 631 uint8_t byte = context->media->read(context->media, context->current_sector_byte);
631 lc8951_write_byte(cdc, cd_block_to_mclks(context->cycle), context->current_sector_byte++, byte); 632 lc8951_write_byte(cdc, cd_block_to_mclks(context->cycle), context->current_sector_byte++, byte);
632 cdd_fader_data(fader, gate_array[GAO_CDD_CTRL] & BIT_MUTE ? 0 : byte); 633 cdd_fader_data(fader, gate_array[GAO_CDD_CTRL] & BIT_MUTE ? 0 : byte);
633 } else { 634 } else {
635 lc8951_write_byte(cdc, cd_block_to_mclks(context->cycle), 0, 0);
634 cdd_fader_data(fader, 0); 636 cdd_fader_data(fader, 0);
635 if (context->current_sector_byte >= 0) { 637 if (context->current_sector_byte >= 0) {
636 next_subcode += BYTE_CLOCKS; 638 next_subcode += BYTE_CLOCKS;
637 context->last_sector_cycle += BYTE_CLOCKS; 639 context->last_sector_cycle += BYTE_CLOCKS;
638 } 640 }