Support for RTC latching. Fixes #4.
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92c2b22735
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@ -369,7 +369,7 @@ int GB_save_battery(GB_gameboy_t *gb, const char *path)
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return EIO;
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return EIO;
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}
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}
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if (gb->cartridge_type->has_rtc) {
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if (gb->cartridge_type->has_rtc) {
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if (fwrite(gb->rtc_data, 1, sizeof(gb->rtc_data), f) != sizeof(gb->rtc_data)) {
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if (fwrite(&gb->rtc_real, 1, sizeof(gb->rtc_real), f) != sizeof(gb->rtc_real)) {
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fclose(f);
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fclose(f);
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return EIO;
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return EIO;
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}
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}
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@ -397,7 +397,7 @@ void GB_load_battery(GB_gameboy_t *gb, const char *path)
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goto reset_rtc;
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goto reset_rtc;
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}
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}
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if (fread(gb->rtc_data, 1, sizeof(gb->rtc_data), f) != sizeof(gb->rtc_data)) {
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if (fread(&gb->rtc_real, 1, sizeof(gb->rtc_real), f) != sizeof(gb->rtc_real)) {
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goto reset_rtc;
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goto reset_rtc;
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}
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}
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@ -418,7 +418,7 @@ void GB_load_battery(GB_gameboy_t *gb, const char *path)
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goto exit;
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goto exit;
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reset_rtc:
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reset_rtc:
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gb->last_rtc_second = time(NULL);
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gb->last_rtc_second = time(NULL);
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gb->rtc_high |= 0x80; /* This gives the game a hint that the clock should be reset. */
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gb->rtc_real.high |= 0x80; /* This gives the game a hint that the clock should be reset. */
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exit:
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exit:
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fclose(f);
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fclose(f);
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return;
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return;
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15
Core/gb.h
15
Core/gb.h
@ -306,15 +306,16 @@ typedef struct GB_gameboy_s {
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GB_SECTION(rtc,
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GB_SECTION(rtc,
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union {
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union {
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struct {
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struct {
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uint8_t rtc_seconds;
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uint8_t seconds;
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uint8_t rtc_minutes;
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uint8_t minutes;
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uint8_t rtc_hours;
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uint8_t hours;
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uint8_t rtc_days;
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uint8_t days;
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uint8_t rtc_high;
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uint8_t high;
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};
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uint8_t rtc_data[5];
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};
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};
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uint8_t data[5];
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} rtc_real, rtc_latched;
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time_t last_rtc_second;
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time_t last_rtc_second;
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bool rtc_latch;
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);
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);
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/* Video Display */
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/* Video Display */
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@ -78,8 +78,8 @@ static uint8_t read_mbc_ram(GB_gameboy_t *gb, uint16_t addr)
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if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
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if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
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/* RTC read */
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/* RTC read */
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gb->rtc_high |= ~0xC1; /* Not all bytes in RTC high are used. */
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gb->rtc_latched.high |= ~0xC1; /* Not all bytes in RTC high are used. */
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return gb->rtc_data[gb->mbc_ram_bank - 8];
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return gb->rtc_latched.data[gb->mbc_ram_bank - 8];
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}
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}
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if (!gb->mbc_ram) {
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if (!gb->mbc_ram) {
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@ -284,7 +284,12 @@ static void write_mbc(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
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case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
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case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
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case 0x2000: case 0x3000: gb->mbc3.rom_bank = value; break;
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case 0x2000: case 0x3000: gb->mbc3.rom_bank = value; break;
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case 0x4000: case 0x5000: gb->mbc3.ram_bank = value; break;
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case 0x4000: case 0x5000: gb->mbc3.ram_bank = value; break;
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case 0x6000: case 0x7000: /* Todo: Clock latching support */ break;
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case 0x6000: case 0x7000:
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if (!gb->rtc_latch && (value & 1)) { /* Todo: verify condition is correct*/
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memcpy(&gb->rtc_latched, &gb->rtc_real, sizeof(gb->rtc_real));
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}
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gb->rtc_latch = value & 1;
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break;
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}
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}
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break;
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break;
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case GB_MBC5:
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case GB_MBC5:
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@ -314,8 +319,7 @@ static void write_mbc_ram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
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if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
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if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
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/* RTC read */
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/* RTC read */
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gb->rtc_data[gb->mbc_ram_bank - 8] = value;
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gb->rtc_latched.data[gb->mbc_ram_bank - 8] = gb->rtc_real.data[gb->mbc_ram_bank - 8] = value; /* Todo: does it really write both? */
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gb->rtc_high |= ~0xC1; /* Not all bytes in RTC high are used. */
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}
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}
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if (gb->cartridge_type->mbc_type == GB_MBC2) {
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if (gb->cartridge_type->mbc_type == GB_MBC2) {
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@ -114,26 +114,26 @@ void GB_emulate_timer_glitch(GB_gameboy_t *gb, uint8_t old_tac, uint8_t new_tac)
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void GB_rtc_run(GB_gameboy_t *gb)
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void GB_rtc_run(GB_gameboy_t *gb)
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{
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{
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if ((gb->rtc_high & 0x40) == 0) { /* is timer running? */
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if ((gb->rtc_real.high & 0x40) == 0) { /* is timer running? */
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time_t current_time = time(NULL);
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time_t current_time = time(NULL);
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while (gb->last_rtc_second < current_time) {
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while (gb->last_rtc_second < current_time) {
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gb->last_rtc_second++;
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gb->last_rtc_second++;
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if (++gb->rtc_seconds == 60)
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if (++gb->rtc_real.seconds == 60)
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{
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{
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gb->rtc_seconds = 0;
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gb->rtc_real.seconds = 0;
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if (++gb->rtc_minutes == 60)
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if (++gb->rtc_real.minutes == 60)
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{
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{
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gb->rtc_minutes = 0;
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gb->rtc_real.minutes = 0;
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if (++gb->rtc_hours == 24)
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if (++gb->rtc_real.hours == 24)
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{
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{
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gb->rtc_hours = 0;
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gb->rtc_real.hours = 0;
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if (++gb->rtc_days == 0)
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if (++gb->rtc_real.days == 0)
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{
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{
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if (gb->rtc_high & 1) /* Bit 8 of days*/
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if (gb->rtc_real.high & 1) /* Bit 8 of days*/
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{
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{
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gb->rtc_high |= 0x80; /* Overflow bit */
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gb->rtc_real.high |= 0x80; /* Overflow bit */
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}
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}
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gb->rtc_high ^= 1;
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gb->rtc_real.high ^= 1;
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}
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}
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}
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}
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}
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}
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