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comparison ym2612.c @ 451:b7c3b2d22858

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Added support for saving savestates. Added gst savestate format test harness
author Mike Pavone <pavone@retrodev.com>
date Fri, 26 Jul 2013 19:55:04 -0700
parents e85a107e6ec0
children 140af5509ce7
comparison
equal deleted inserted replaced
448:e85a107e6ec0 451:b7c3b2d22858
580 operator->phase_inc = inc; 580 operator->phase_inc = inc;
581 } 581 }
582 582
583 void ym_data_write(ym2612_context * context, uint8_t value) 583 void ym_data_write(ym2612_context * context, uint8_t value)
584 { 584 {
585 if (context->selected_reg < 0x21 || context->selected_reg > 0xB6 || (context->selected_reg < 0x30 && context->selected_part)) { 585 if (context->selected_reg >= YM_REG_END) {
586 return; 586 return;
587 }
588 if (context->selected_part) {
589 if (context->selected_reg < YM_PART2_START) {
590 return;
591 }
592 context->part2_regs[context->selected_reg - YM_PART2_START] = value;
593 } else {
594 if (context->selected_reg < YM_PART1_START) {
595 return;
596 }
597 context->part1_regs[context->selected_reg - YM_PART1_START] = value;
587 } 598 }
588 dfprintf(debug_file, "write of %X to reg %X in part %d\n", value, context->selected_reg, context->selected_part+1); 599 dfprintf(debug_file, "write of %X to reg %X in part %d\n", value, context->selected_reg, context->selected_part+1);
589 if (context->selected_reg < 0x30) { 600 if (context->selected_reg < 0x30) {
590 //Shared regs 601 //Shared regs
591 switch (context->selected_reg) 602 switch (context->selected_reg)
763 uint8_t ym_read_status(ym2612_context * context) 774 uint8_t ym_read_status(ym2612_context * context)
764 { 775 {
765 return context->status; 776 return context->status;
766 } 777 }
767 778
768 #define GST_YM_OFFSET 0x1E4
769 #define GST_YM_SIZE (0x3E4-GST_YM_OFFSET)
770
771 uint8_t ym_load_gst(ym2612_context * context, FILE * gstfile)
772 {
773 uint8_t regdata[GST_YM_SIZE];
774 fseek(gstfile, GST_YM_OFFSET, SEEK_SET);
775 if (fread(regdata, 1, sizeof(regdata), gstfile) != sizeof(regdata)) {
776 return 0;
777 }
778 for (int i = 0; i < sizeof(regdata); i++) {
779 if (i & 0x100) {
780 ym_address_write_part2(context, i & 0xFF);
781 } else {
782 ym_address_write_part1(context, i);
783 }
784 ym_data_write(context, regdata[i]);
785 }
786 return 1;
787 }
788