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RTC accuracy fix

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This commit is contained in:
Lior Halphon 2021-04-23 21:01:17 +03:00
parent a2d3b8c174
commit ac5b0aca2c
2 changed files with 3 additions and 6 deletions
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2
Core/gb.h
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@ -543,7 +543,7 @@ struct GB_gameboy_internal_s {
GB_SECTION(rtc, GB_SECTION(rtc,
GB_rtc_time_t rtc_real, rtc_latched; GB_rtc_time_t rtc_real, rtc_latched;
uint64_t last_rtc_second; uint64_t last_rtc_second;
bool rtc_latch; GB_PADDING(bool, rtc_latch);
uint32_t rtc_cycles; uint32_t rtc_cycles;
uint8_t tpp1_mr4; uint8_t tpp1_mr4;
); );

5
Core/memory.c
View File

@ -541,10 +541,7 @@ static void write_mbc(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
gb->mbc3_rtc_mapped = value & 8; gb->mbc3_rtc_mapped = value & 8;
break; break;
case 0x6000: case 0x7000: case 0x6000: case 0x7000:
if (!gb->rtc_latch && (value & 1)) { /* Todo: verify condition is correct */
memcpy(&gb->rtc_latched, &gb->rtc_real, sizeof(gb->rtc_real)); memcpy(&gb->rtc_latched, &gb->rtc_real, sizeof(gb->rtc_real));
}
gb->rtc_latch = value & 1;
break; break;
} }
break; break;
@ -781,7 +778,7 @@ static void write_mbc_ram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
if (gb->mbc_ram_bank == 0) { if (gb->mbc_ram_bank == 0) {
gb->rtc_cycles = 0; gb->rtc_cycles = 0;
} }
gb->rtc_latched.data[gb->mbc_ram_bank] = gb->rtc_real.data[gb->mbc_ram_bank] = value; gb->rtc_real.data[gb->mbc_ram_bank] = value;
} }
return; return;
} }