From f5dbe460609e9255ee88eeaa739819577f33a432 Mon Sep 17 00:00:00 2001
From: Byron Lathi <bslathi19@gmail.com>
Date: Mon, 14 Mar 2022 13:34:33 -0500
Subject: [PATCH] Add irq_set_status

irq_set_status can be used to clear the irq status bit so that the
interrupt will stop occuring.
---
 sw/interrupt.h | 1 +
 sw/interrupt.s | 6 +++++-
 sw/irq.c       | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/sw/interrupt.h b/sw/interrupt.h
index ce29bc5..ebd5951 100644
--- a/sw/interrupt.h
+++ b/sw/interrupt.h
@@ -9,5 +9,6 @@ void irq_int();
 void nmi_int();
 
 uint8_t irq_get_status();
+void irq_set_status(uint8_t);
 
 #endif
\ No newline at end of file
diff --git a/sw/interrupt.s b/sw/interrupt.s
index aad0d6b..f87f81d 100644
--- a/sw/interrupt.s
+++ b/sw/interrupt.s
@@ -9,7 +9,7 @@
 .import   _handle_irq
 
 .export   _irq_int, _nmi_int
-.export   _irq_get_status
+.export   _irq_get_status, _irq_set_status
 
 .include "io.inc65"
 
@@ -51,4 +51,8 @@ break:     JMP break              ; If BRK is detected, something very bad
 _irq_get_status:
            lda IRQ_STATUS
            ldx #$00
+           rts
+
+_irq_set_status:
+           sta IRQ_STATUS
            rts
\ No newline at end of file
diff --git a/sw/irq.c b/sw/irq.c
index 64f6d74..3aec0c1 100644
--- a/sw/irq.c
+++ b/sw/irq.c
@@ -15,5 +15,6 @@ void handle_irq() {
 
     if (status & BUTTON) {
         puts("Button Interrupt!\n");
+        irq_set_status(status & ~BUTTON);
     }
 }
\ No newline at end of file