From 8c1dac468506efcba3fe3d000442efdd5f6bd58e Mon Sep 17 00:00:00 2001
From: Bruno Duarte Gouveia <bgouveia@gmail.com>
Date: Wed, 14 Nov 2018 00:50:00 +0000
Subject: [PATCH] IRQ: only set irq_vector to specific address if both
 interrupt enable (IE) and interrupt flag (IF) are enabled

---
 gb.v | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/gb.v b/gb.v
index 5201914..424789c 100644
--- a/gb.v
+++ b/gb.v
@@ -176,11 +176,11 @@ wire irq_ack = !cpu_iorq_n && !cpu_m1_n;
 
 // irq vector
 wire [7:0] irq_vec = 
-			if_r[0]?8'h40:   // vsync
-			if_r[1]?8'h48:   // lcdc
-			if_r[2]?8'h50:   // timer
-			if_r[3]?8'h58:   // serial
-			if_r[4]?8'h60:   // input
+			if_r[0]&&ie_r[0]?8'h40:   // vsync
+			if_r[1]&&ie_r[1]?8'h48:   // lcdc
+			if_r[2]&&ie_r[2]?8'h50:   // timer
+			if_r[3]&&ie_r[3]?8'h58:   // serial
+			if_r[4]&&ie_r[4]?8'h60:   // input
 			8'h55;
 
 wire vs = (lcd_mode == 2'b01);