Continue implementing more opcode tests

src/emu.rs

@@ -370,26 +370,19 @@ impl Chip8 {
         // if current key is the same as the on in Vx
         // program counter is increased by 2
 
-        if let Some(key) = self.key.get_pressed() {
-            if self.v[x as usize] == key {
+        if self.key.is_pressed(self.v[x as usize]) {
             self.pc += 2;
         }
     }
-    }
 
     fn skip_not_pressed(&mut self, x: u8) {
         // if current key is not the sameas the one in Vx
         // increment the program counter by 2
 
-        match self.key.get_pressed() {
-            Some(key) => {
-                if self.v[x as usize] != key {
+        if !self.key.is_pressed(self.v[x as usize]) {
             self.pc += 2;
         }
     }
-            None => self.pc += 2,
-        }
-    }
 
     fn copy_delay_timer_val(&mut self, x: u8) {
         // set Vx to be the value of the delay timer
@@ -400,7 +393,7 @@ impl Chip8 {
         // wait (blocking) until a key is pressed
         // once pressed, store in Vx
 
-        match self.key.get_pressed() {
+        match self.key.get_any_pressed() {
             Some(key) => self.v[x as usize] = key,
             None => self.pc -= 2,
         }
@@ -413,7 +406,7 @@ impl Chip8 {
 
     fn set_sound_to_vx(&mut self, x: u8) {
         // set sound timer to be value of Vx
-        self.delay.set(self.v[x as usize]);
+        self.sound.set(self.v[x as usize]);
     }
 
     fn add_vx_to_i(&mut self, x: u8) {
@@ -865,4 +858,141 @@ mod test {
 
         assert_eq!(chip8.pc, 0x05D2 + 0xA2);
     }
+
+    #[test]
+    fn opcode_rand_works() {
+        // Random Value so there's no real way to test it
+        // I don't think we can seed the RNG when we use rand::random()
+
+        // However, sine we bitwise AND the random byte with another byte,
+        // we can test that random_byte & 0x00 == 0x00
+        let mut chip8: Chip8 = Default::default();
+
+        chip8.v[0xE] = 0x77; // Make sure that VE is not 0x00
+        chip8.rand(0xE, 0x00);
+        assert_eq!(chip8.v[0xE], 0x00);
+    }
+
+    #[test]
+    #[ignore]
+    fn opcode_draw_works() {
+        // Will do this once I've rewritten the opcode for 0xDxyn
+        todo!("TODO: Write this Opcode Test")
+    }
+
+    #[test]
+    fn opcode_skip_on_press_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        // Key and Vx are equal
+        chip8.pc = 0x200;
+        chip8.v[0xD] = 0xA;
+        chip8.key.set_key(0xA);
+        chip8.skip_on_press(0xD);
+
+        assert_eq!(chip8.pc, 0x202);
+
+        // Key and Vx are **not** equal
+        chip8.key.reset();
+
+        chip8.pc = 0x200;
+        chip8.v[0xD] = 0xA;
+        chip8.key.set_key(0x3);
+        chip8.skip_on_press(0xD);
+
+        assert_ne!(chip8.pc, 0x202);
+    }
+
+    #[test]
+    fn opcode_skip_not_pressed_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        // Key and Vx are equal
+        chip8.pc = 0x200;
+        chip8.v[0xD] = 0xA;
+        chip8.key.set_key(0xA);
+        chip8.skip_not_pressed(0xD);
+
+        assert_ne!(chip8.pc, 0x202);
+
+        // Key and Vx are **not** equal
+        chip8.key.reset();
+
+        chip8.pc = 0x200;
+        chip8.v[0xD] = 0xA;
+        chip8.key.set_key(0x3);
+        chip8.skip_not_pressed(0xD);
+
+        assert_eq!(chip8.pc, 0x202);
+    }
+
+    #[test]
+    fn opcode_copy_delay_timer_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        chip8.delay.set(0x0F);
+        chip8.v[0x2] = 0x00;
+        chip8.copy_delay_timer_val(0x2);
+
+        assert_eq!(chip8.v[0x2], 0x0F);
+    }
+
+    #[test]
+    fn opcode_loop_until_key_vx_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        // Nothing Pressed
+        chip8.pc = 0x200;
+        chip8.v[0xC] = 0xFF; // Not a valid Key
+        chip8.loop_until_key_vx(0xC);
+
+        assert_eq!(chip8.v[0xC], 0xFF);
+        assert_eq!(chip8.pc, 0x1FE);
+
+        // Something Pressed
+        chip8.key.set_key(0x3);
+        chip8.pc = 0x200;
+        chip8.v[0xC] = 0xFF; // Not a valid Key
+        chip8.loop_until_key_vx(0xC);
+
+        assert_eq!(chip8.v[0xC], 0x3);
+        assert_eq!(chip8.pc, 0x200);
+    }
+
+    #[test]
+    fn opcode_set_delay_to_vx_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        chip8.v[0x1] = 0x0F;
+        chip8.set_delay_to_vx(0x01);
+
+        assert_eq!(chip8.v[0x1], chip8.delay.get());
+    }
+
+    #[test]
+    fn opcode_set_sound_to_vx_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        chip8.v[0x2] = 0x0F;
+        chip8.set_sound_to_vx(0x2);
+
+        assert_eq!(chip8.v[0x2], chip8.sound.get());
+    }
+
+    #[test]
+    fn opcode_add_vx_to_i_works() {
+        let mut chip8: Chip8 = Default::default();
+
+        chip8.i = 0x22;
+        chip8.v[0x6] = 0xC9;
+        chip8.add_vx_to_i(0x6);
+
+        assert_eq!(chip8.i, 0xEB);
+    }
+
+    #[test]
+    #[ignore]
+    fn opcode_set_i_to_hex_sprite_loc_works() {
+        todo!("Figure out how this instructin works")
+    }
 }

src/periph.rs

@@ -68,16 +68,36 @@ impl Default for Keypad {
 }
 
 impl Keypad {
-    pub fn get_pressed(&self) -> Option<u8> {
-        let mut found: Option<u8> = None;
-
-        for (index, key) in self.keys.iter().enumerate() {
+    pub fn get_any_pressed(&self) -> Option<u8> {
+        for (i, key) in self.keys.iter().enumerate() {
             if *key {
-                found = Some(index as u8);
-                break;
+                return Some(i as u8);
             }
         }
+        None
+    }
 
-        found
+    pub fn reset(&mut self) {
+        self.keys = [false; 16];
+    }
+
+    pub fn get_overview(&self) -> [bool; 16] {
+        self.keys
+    }
+
+    pub fn is_pressed(&self, key: u8) -> bool {
+        self.keys[key as usize]
+    }
+
+    pub fn set_all(&mut self, keys: [bool; 16]) {
+        self.keys = keys;
+    }
+
+    pub fn set_key(&mut self, index: usize) {
+        self.keys[index] = true;
+    }
+
+    pub fn unset_key(&mut self, index: usize) {
+        self.keys[index] = false;
     }
 }