From 6bb61bc67017c7f16678c4bb7f0e863997ca6457 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Fri, 19 Dec 2014 19:59:36 -0800
Subject: [PATCH] GBA Memory: Don't call into GPIO write calls if GPIO devices
 are absent

---
 CHANGES              | 1 +
 src/gba/gba-memory.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 422d5b2fb..34ece312c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -8,6 +8,7 @@ Bugfixes:
  - GBA Thread: Allow halted games to exit cleanly
  - GBA BIOS: Fix HLE Lz77 and RL functions to properly account for width and invalid addresses
  - ARM7: Fix LDM writeback to a register already written
+ - GBA Memory: Don't call into GPIO write calls if GPIO devices are absent
 Misc:
  - Qt: Disable sync to video by default
 
diff --git a/src/gba/gba-memory.c b/src/gba/gba-memory.c
index a0a092c81..62c03a640 100644
--- a/src/gba/gba-memory.c
+++ b/src/gba/gba-memory.c
@@ -581,7 +581,7 @@ void GBAStore16(struct ARMCore* cpu, uint32_t address, int16_t value, int* cycle
 		gba->video.renderer->writeOAM(gba->video.renderer, (address & (SIZE_OAM - 1)) >> 1);
 		break;
 	case REGION_CART0:
-		if (IS_GPIO_REGISTER(address & 0xFFFFFF)) {
+		if (memory->gpio.gpioDevices != GPIO_NONE && IS_GPIO_REGISTER(address & 0xFFFFFF)) {
 			uint32_t reg = address & 0xFFFFFF;
 			GBAGPIOWrite(&memory->gpio, reg, value);
 		} else {