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comparison cdd_mcu.c @ 2089:0db3af42dd72

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Fix some byte order stuff for audio tracks
author Michael Pavone <pavone@retrodev.com>
date Sun, 06 Feb 2022 13:51:49 -0800
parents c9d3b8e1ea56
children c732dcc9c61b
comparison
equal deleted inserted replaced
2088:c716af3f8980 2089:0db3af42dd72
37 void cdd_mcu_init(cdd_mcu *context, system_media *media) 37 void cdd_mcu_init(cdd_mcu *context, system_media *media)
38 { 38 {
39 context->next_int_cycle = CYCLE_NEVER; 39 context->next_int_cycle = CYCLE_NEVER;
40 context->last_subcode_cycle = CYCLE_NEVER; 40 context->last_subcode_cycle = CYCLE_NEVER;
41 context->last_nibble_cycle = CYCLE_NEVER; 41 context->last_nibble_cycle = CYCLE_NEVER;
42 context->last_byte_cycle = 0; 42 context->next_byte_cycle = 0;
43 context->requested_format = SF_NOTREADY; 43 context->requested_format = SF_NOTREADY;
44 context->media = media; 44 context->media = media;
45 context->current_status_nibble = -1; 45 context->current_status_nibble = -1;
46 context->current_cmd_nibble = -1; 46 context->current_cmd_nibble = -1;
47 context->current_sector_byte = -1; 47 context->current_sector_byte = -1;
508 } 508 }
509 509
510 void cdd_mcu_run(cdd_mcu *context, uint32_t cycle, uint16_t *gate_array, lc8951* cdc, cdd_fader* fader) 510 void cdd_mcu_run(cdd_mcu *context, uint32_t cycle, uint16_t *gate_array, lc8951* cdc, cdd_fader* fader)
511 { 511 {
512 uint32_t cd_cycle = mclks_to_cd_block(cycle); 512 uint32_t cd_cycle = mclks_to_cd_block(cycle);
513 uint32_t next_byte = context->last_byte_cycle + BYTE_CLOCKS;
514 if (!(gate_array[GAO_CDD_CTRL] & BIT_HOCK)) { 513 if (!(gate_array[GAO_CDD_CTRL] & BIT_HOCK)) {
515 //it's a little unclear if this gates the actual cd block clock or just handshaking 514 //it's a little unclear if this gates the actual cd block clock or just handshaking
516 //assum it's actually the clock for now 515 //assum it's actually the clock for now
517 for (; context->cycle < cd_cycle; context->cycle += CDD_MCU_DIVIDER) { 516 for (; context->cycle < cd_cycle; context->cycle += CDD_MCU_DIVIDER) {
518 if (context->cycle >= next_byte) { 517 if (context->cycle >= context->next_byte_cycle) {
519 cdd_fader_data(fader, 0); 518 cdd_fader_data(fader, 0);
520 next_byte = context->cycle + BYTE_CLOCKS; 519 context->next_byte_cycle += BYTE_CLOCKS;
521 context->last_byte_cycle = context->cycle;
522 } 520 }
523 } 521 }
524 gate_array[GAO_CDD_CTRL] |= BIT_MUTE; 522 gate_array[GAO_CDD_CTRL] |= BIT_MUTE;
525 return; 523 return;
526 } 524 }
583 context->current_cmd_nibble++; 581 context->current_cmd_nibble++;
584 context->last_nibble_cycle = context->cycle; 582 context->last_nibble_cycle = context->cycle;
585 next_cmd_nibble = context->cycle + NIBBLE_CLOCKS; 583 next_cmd_nibble = context->cycle + NIBBLE_CLOCKS;
586 } 584 }
587 } 585 }
588 if (context->cycle >= next_byte) { 586 if (context->cycle >= context->next_byte_cycle) {
589 if (context->current_sector_byte >= 0) { 587 if (context->current_sector_byte >= 0) {
590 uint8_t byte = context->media->read(context->media, context->current_sector_byte); 588 uint8_t byte = context->media->read(context->media, context->current_sector_byte);
591 lc8951_write_byte(cdc, cd_block_to_mclks(context->cycle), context->current_sector_byte++, byte); 589 lc8951_write_byte(cdc, cd_block_to_mclks(context->cycle), context->current_sector_byte++, byte);
592 cdd_fader_data(fader, gate_array[GAO_CDD_CTRL] & BIT_MUTE ? 0 : byte); 590 cdd_fader_data(fader, gate_array[GAO_CDD_CTRL] & BIT_MUTE ? 0 : byte);
593 } else { 591 } else {
594 cdd_fader_data(fader, 0); 592 cdd_fader_data(fader, 0);
595 } 593 }
596 context->last_byte_cycle = context->cycle;
597 if (context->current_sector_byte == 2352) { 594 if (context->current_sector_byte == 2352) {
598 context->current_sector_byte = -1; 595 context->current_sector_byte = -1;
599 } 596 }
600 next_byte = context->cycle + BYTE_CLOCKS; 597 context->next_byte_cycle += BYTE_CLOCKS;
601 } 598 }
602 } 599 }
603 } 600 }
604 601
605 void cdd_mcu_start_cmd_recv(cdd_mcu *context, uint16_t *gate_array) 602 void cdd_mcu_start_cmd_recv(cdd_mcu *context, uint16_t *gate_array)
652 context->last_nibble_cycle -= cd_deduction; 649 context->last_nibble_cycle -= cd_deduction;
653 } else { 650 } else {
654 context->last_nibble_cycle = 0; 651 context->last_nibble_cycle = 0;
655 } 652 }
656 } 653 }
657 if (context->last_byte_cycle != CYCLE_NEVER) { 654 context->next_byte_cycle -= deduction;
658 if (context->last_byte_cycle > cd_deduction) { 655 }
659 context->last_byte_cycle -= cd_deduction;
660 } else {
661 context->last_byte_cycle = 0;
662 }
663 }
664 }