GB: Implement keypad IRQs

CHANGES

@@ -21,7 +21,7 @@ Features:
  - Debugger: Segment/bank support
  - GB: Symbol table support
  - GB MBC: Add MBC1 multicart support
- - GBA: Implement keypad interrupts
+ - Implement keypad interrupts
  - LR35902: Watchpoints
  - Memory search
  - Debugger: Execution tracing

include/mgba/internal/gb/gb.h

@@ -139,6 +139,8 @@ bool GBIsROM(struct VFile* vf);
 void GBGetGameTitle(const struct GB* gba, char* out);
 void GBGetGameCode(const struct GB* gba, char* out);
 
+void GBTestKeypadIRQ(struct GB* gb);
+
 void GBFrameEnded(struct GB* gb);
 
 CXX_GUARD_END

src/gb/core.c

@@ -432,11 +432,13 @@ static bool _GBCoreSaveState(struct mCore* core, void* state) {
 static void _GBCoreSetKeys(struct mCore* core, uint32_t keys) {
 	struct GBCore* gbcore = (struct GBCore*) core;
 	gbcore->keys = keys;
+	GBTestKeypadIRQ(core->board);
 }
 
 static void _GBCoreAddKeys(struct mCore* core, uint32_t keys) {
 	struct GBCore* gbcore = (struct GBCore*) core;
 	gbcore->keys |= keys;
+	GBTestKeypadIRQ(core->board);
 }
 
 static void _GBCoreClearKeys(struct mCore* core, uint32_t keys) {

src/gb/gb.c

@@ -710,4 +710,6 @@ void GBFrameEnded(struct GB* gb) {
 			mCheatRefresh(device, cheats);
 		}
 	}
+
+	GBTestKeypadIRQ(gb);
 }

src/gb/io.c

@@ -564,6 +564,13 @@ uint8_t GBIORead(struct GB* gb, unsigned address) {
 	return gb->memory.io[address] | _registerMask[address];
 }
 
+void GBTestKeypadIRQ(struct GB* gb) {
+	if (_readKeys(gb)) {
+		gb->memory.io[REG_IF] |= (1 << GB_IRQ_KEYPAD);
+		GBUpdateIRQs(gb);
+	}
+}
+
 struct GBSerializedState;
 void GBIOSerialize(const struct GB* gb, struct GBSerializedState* state) {
 	memcpy(state->io, gb->memory.io, GB_SIZE_IO);