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It seems like STAT’s LYC flag should be on while the screen is off.

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This commit is contained in:
Lior Halphon 2017-02-21 21:31:52 +02:00
parent fed3b4f9cd
commit f4a364c3db
1 changed files with 3 additions and 2 deletions
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5
Core/display.c
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@ -318,9 +318,10 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
/* LCD is disabled, do nothing */ /* LCD is disabled, do nothing */
/* When the LCD is off, LY is 0 and STAT mode is 0. /* When the LCD is off, LY is 0 and STAT mode is 0.
Todo: how is the LY=LYC flag handled? */ Todo: Verify the LY=LYC flag should be on. */
gb->io_registers[GB_IO_LY] = 0; gb->io_registers[GB_IO_LY] = 0;
gb->io_registers[GB_IO_STAT] &= ~7; gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 4;
/* Keep sending vblanks to user even if the screen is off */ /* Keep sending vblanks to user even if the screen is off */
gb->display_cycles += cycles; gb->display_cycles += cycles;