From aceb1dff97540f1432360a048e82d2c515462faf Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Thu, 14 Oct 2021 01:46:55 -0700
Subject: [PATCH] GBA I/O: Update KEYINPUT in internal I/O memory (fixes #2235)

---
 CHANGES      | 1 +
 src/gba/io.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 9b04bacb1..5b351afae 100644
--- a/CHANGES
+++ b/CHANGES
@@ -19,6 +19,7 @@ Other fixes:
  - Qt: Fix corrupted savestate and fatal error text
  - Qt: Fix sprite compositing when sprite tiles go out of bounds (fixes mgba.io/i/2348)
 Misc:
+ - GBA I/O: Update KEYINPUT in internal I/O memory (fixes mgba.io/i/2235)
  - SDL: Use SDL_JoystickRumble where available
  - Wii: Add adjustable gyroscope settings (closes mgba.io/i/2245)
 
diff --git a/src/gba/io.c b/src/gba/io.c
index cc39e1192..7abf28047 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -763,8 +763,9 @@ uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
 					}
 				}
 			}
-			return 0x3FF ^ input;
+			gba->memory.io[address >> 1] = 0x3FF ^ input;
 		}
+		break;
 	case REG_SIOCNT:
 		return gba->sio.siocnt;
 	case REG_RCNT: