git.y1.nz

commit b1187919d3c4526697d54d3e7c1287c15da73944
parent 2c71ca789f66b25910bd729d202948ed3e3fb78e
Author: Lior Halphon <LIJI32@gmail.com>
Date:   Sun,  9 Jan 2022 16:43:32 +0200

Fixed a bug with the joy_accessed API

Diffstat:
M
Core/joypad.c
10
++++++++--

1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/Core/joypad.c b/Core/joypad.c
@@ -59,7 +59,10 @@ void GB_update_joyp(GB_gameboy_t *gb)
     /* Todo: This assumes the keys *always* bounce, which is incorrect when emulating an SGB */
     if (previous_state != (gb->io_registers[GB_IO_JOYP] & 0xF)) {
         /* The joypad interrupt DOES occur on CGB (Tested on CGB-E), unlike what some documents say. */
-        gb->io_registers[GB_IO_IF] |= 0x10;
+        if (!(gb->io_registers[GB_IO_IF] & 0x10)) {
+            gb->joyp_accessed = true;
+            gb->io_registers[GB_IO_IF] |= 0x10;
+        }
     }
     
     gb->io_registers[GB_IO_JOYP] |= 0xC0;
@@ -72,7 +75,10 @@ void GB_icd_set_joyp(GB_gameboy_t *gb, uint8_t value)
     gb->io_registers[GB_IO_JOYP] |= value & 0xF;
     
     if (previous_state & ~(gb->io_registers[GB_IO_JOYP] & 0xF)) {
-        gb->io_registers[GB_IO_IF] |= 0x10;
+        if (!(gb->io_registers[GB_IO_IF] & 0x10)) {
+            gb->joyp_accessed = true;
+            gb->io_registers[GB_IO_IF] |= 0x10;
+        }
     }
     gb->io_registers[GB_IO_JOYP] |= 0xC0;
 }

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