From 9cbbd9f255fda8a27a025a1f244d4e22028f199f Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Tue, 27 Dec 2016 03:48:41 -0800
Subject: [PATCH] GBA I/O: Set JOYSTAT TRANS flag when writing JOY_TRANS
 registers

---
 CHANGES      | 1 +
 src/gba/io.c | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index b9174874f..43cdc4881 100644
--- a/CHANGES
+++ b/CHANGES
@@ -71,6 +71,7 @@ Misc:
  - GBA DMA: Move DMAs to using absolute timing
  - All: Add C++ header guards
  - GBA I/O: Clear JOYSTAT RECV flag when reading JOY_RECV registers
+ - GBA I/O: Set JOYSTAT TRANS flag when writing JOY_TRANS registers
 
 0.5.1: (2016-10-05)
 Bugfixes:
diff --git a/src/gba/io.c b/src/gba/io.c
index 0ec739915..c705a3cc3 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -524,13 +524,15 @@ void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 			value &= 0xC1FF;
 			GBASIOWriteRCNT(&gba->sio, value);
 			break;
+		case REG_JOY_TRANS_LO:
+		case REG_JOY_TRANS_HI:
+			gba->memory.io[REG_JOYSTAT >> 1] |= JOYSTAT_TRANS_BIT;
+			// Fall through
 		case REG_SIOMLT_SEND:
 		case REG_JOYCNT:
 		case REG_JOYSTAT:
 		case REG_JOY_RECV_LO:
 		case REG_JOY_RECV_HI:
-		case REG_JOY_TRANS_LO:
-		case REG_JOY_TRANS_HI:
 			value = GBASIOWriteRegister(&gba->sio, address, value);
 			break;