From a302c483d10ecae40ec5aeb522e950e4a9cb1f49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Magalh=C3=A3es?= <joamag@gmail.com>
Date: Wed, 29 Jun 2022 16:04:20 +0100
Subject: [PATCH] feat: new instructions
---
src/cpu.rs | 25 ++++++++++++++++++++++---
1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/src/cpu.rs b/src/cpu.rs
index 6ea093ba..12f1ce69 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -17,7 +17,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
(inc_c, 4, "INC C"),
- (nop, 4, "! UNIMP !"),
+ (dec_c, 4, "DEC C"),
(ld_c_u8, 8, "LD C, u8"),
(nop, 4, "! UNIMP !"),
// 0x1 opcodes
@@ -130,7 +130,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
- (nop, 4, "! UNIMP !"),
+ (ld_mhl_a, 8, "LD [HL], A"),
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
@@ -252,7 +252,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
- (nop, 4, "! UNIMP !"),
+ (ld_mu16_a, 16, "LD [u16], A"),
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
(nop, 4, "! UNIMP !"),
@@ -755,6 +755,16 @@ fn inc_c(cpu: &mut Cpu) {
cpu.c = value;
}
+fn dec_c(cpu: &mut Cpu) {
+ let value = cpu.c.wrapping_sub(1);
+
+ cpu.set_sub(true);
+ cpu.set_zero(value == 0);
+ cpu.set_half_carry((value & 0xf) == 0xf);
+
+ cpu.c = value;
+}
+
fn ld_c_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.c = byte;
@@ -855,6 +865,10 @@ fn ld_c_a(cpu: &mut Cpu) {
cpu.c = cpu.a;
}
+fn ld_mhl_a(cpu: &mut Cpu) {
+ cpu.mmu.write(cpu.hl(), cpu.a);
+}
+
fn ld_a_e(cpu: &mut Cpu) {
cpu.a = cpu.e;
}
@@ -905,6 +919,11 @@ fn ld_mff00c_a(cpu: &mut Cpu) {
cpu.mmu.write(0xff0c + cpu.c as u16, cpu.a);
}
+fn ld_mu16_a(cpu: &mut Cpu) {
+ let word = cpu.read_u16();
+ cpu.mmu.write(word, cpu.a);
+}
+
fn cp_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
sub_set_flags(cpu, cpu.a, byte);
--
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