feat: added LD A, [DE]

examples/sdl/src/main.rs

@@ -6,7 +6,7 @@ fn main() {
 
     for _ in 0..40000 {
         game_boy.clock();
-        if game_boy.cpu().pc() >= 0x0023 {
+        if game_boy.cpu().pc() >= 0x0032 {
             break;
         }
     }

src/cpu.rs

@@ -31,7 +31,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
     (nop, 4, "NOP"),
     (nop, 4, "NOP"),
     (nop, 4, "NOP"),
-    (nop, 4, "NOP"),
+    (ld_a_mde, 8, "LD A, [DE]"),
     (nop, 4, "NOP"),
     (nop, 4, "NOP"),
     (nop, 4, "NOP"),
@@ -736,6 +736,11 @@ fn ld_de_u16(cpu: &mut Cpu) {
     cpu.set_de(word);
 }
 
+fn ld_a_mde(cpu: &mut Cpu) {
+    let byte = cpu.mmu.read(cpu.de());
+    cpu.a = byte;
+}
+
 fn jr_nz_i8(cpu: &mut Cpu) {
     let byte = cpu.read_u8() as i8;