Add RNG and buttons

lwcpu/src/lib.rs

@@ -68,3 +68,31 @@ impl NumberDisplay {
     }
 }
 
+pub struct RNG {}
+impl RNG {
+    #[inline]
+    pub fn next() -> u32 {
+        return unsafe { read_volatile(RANDOM_NUMBER_POINTER) };
+    }
+    #[inline]
+    pub fn next_range(min: u32, max: u32) -> u32 {
+        return RNG::next() % (max - min) + min;
+    }
+}
+
+pub struct Buttons {}
+impl Buttons {
+    pub const RIGHT_RIGHT: u8 = 0b00000001;
+    pub const RIGHT_DOWN : u8 = 0b00000010;
+    pub const RIGHT_LEFT : u8 = 0b00000100;
+    pub const RIGHT_UP   : u8 = 0b00001000;
+    pub const LEFT_RIGHT : u8 = 0b00010000;
+    pub const LEFT_DOWN  : u8 = 0b00100000;
+    pub const LEFT_LEFT  : u8 = 0b01000000;
+    pub const LEFT_UP    : u8 = 0b10000000;
+
+    #[inline]
+    pub fn read() -> u8 {
+        return unsafe { read_volatile(BUTTONS_POINTER) };
+    }
+}