git.y1.nz

commit 94793354ab49de1004dcabb396281097660b061d
parent 2de8c0dc5b41d44db7a8429d41134b3f7cc9c1f9
Author: Michel Iwaniec <46843052+michel-iwaniec@users.noreply.github.com>
Date:   Wed, 16 Oct 2024 00:57:33 +0100

NES: Add reset function for compatibility (#719)


Diffstat:
M
gbdk-lib/include/nes/nes.h
15
+++++++++++++++

1 file changed, 15 insertions(+), 0 deletions(-)
diff --git a/gbdk-lib/include/nes/nes.h b/gbdk-lib/include/nes/nes.h
@@ -467,6 +467,21 @@ inline void disable_interrupts(void) {
     __asm__("sei");
 }
 
+/** Performs a soft reset.
+
+    For the Game Boy and related it does this by jumping to address 0x0150
+    which is in crt0.s (the c-runtime that executes before main() is called).
+
+    This performs various startup steps such as resetting the stack,
+    clearing WRAM and OAM, resetting initialized variables and some
+    display registers (scroll, window, LCDC), etc.
+
+    This is not the same a hard power reset.
+*/
+inline void reset(void) {
+    __asm__("jmp [0xFFFC]");
+}
+
 /** Waits for the vertical blank interrupt.
 
     This is often used in main loops to idle the CPU

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