commit 188a4b42e70bce44d0e2caf07da2462c0bc40d20
from: Witcher01 <witcher01+github@posteo.net>
date: Sun Aug  1 17:24:33 2021 UTC

added instruction SE

commit - 0a7f71f87659d462e65e5bd93676f449a510572d
commit + 188a4b42e70bce44d0e2caf07da2462c0bc40d20
blob - 5eb4797855ab2813d2ab84f03f306b91fc948005
blob + afab9ce677416cc1b6b310459f62d5967d24d897
--- src/chip8.rs
+++ src/chip8.rs
@@ -46,6 +46,7 @@ impl Chip8 {
     /// Execute a given instruction.
     pub fn execute(&mut self, instruction: u16) -> Result<(), String> {
         let nnn = instruction & 0x0FFF;
+
         match instruction & 0xF000 {
             0x0 => match nnn {
                 // CLS
@@ -74,6 +75,16 @@ impl Chip8 {
                 self.stack.push(self.pc + 1);
                 self.pc = nnn;
             },
+            // SE
+            0x3 => {
+                let reg = instruction & 0x0F00;
+                let byte = (instruction & 0x00FF) as u8;
+
+                // skip next instruction if Vx == byte
+                if self.regs[reg as usize] == byte {
+                    self.pc = self.pc + 2;
+                }
+            },
             _ => {
                 return Err(format!("{:#06x}: not an instruction", instruction));
             }