M src/gba/gba-io.c → src/gba/gba-io.c

@@ -2,6 +2,10 @@ #include "gba-io.h"
 
 #include "gba-video.h"
 
+void GBAIOInit(struct GBA* gba) {
+	gba->memory.io[REG_KEYINPUT >> 1] = 0x3FF;
+}
+
 void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 	switch (address) {
 	case REG_DISPSTAT:

M src/gba/gba-io.h → src/gba/gba-io.h

@@ -141,6 +141,7 @@ REG_POSTFLG = 0x300,
 	REG_HALTCNT = 0x301
 };
 
+void GBAIOInit(struct GBA* gba);
 void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value);
 void GBAIOWrite32(struct GBA* gba, uint32_t address, uint32_t value);
 uint16_t GBAIORead(struct GBA* gba, uint32_t address);

M src/gba/gba.c → src/gba/gba.c

@@ -37,6 +37,8 @@
 	gba->video.p = gba;
 	GBAVideoInit(&gba->video);
 
+	GBAIOInit(gba);
+
 	gba->springIRQ = 0;
 
 	ARMReset(&gba->cpu);