Screen

src/main.rs

@@ -13,32 +13,22 @@ fn panic_handler(_info: &PanicInfo) -> ! {
 }
 
 const OUTPUT: *mut u32 = 0x2000_0000 as *mut u32;
-const BTNS: *mut u8 = 0x2000_0008 as *mut u8;
+// const BTNS: *mut u8 = 0x2000_0008 as *mut u8;
+
+const SCREEN: *mut u32 = 0x2000_0080 as *mut u32;
 
 #[entry]
 fn main() -> ! {
     let mut value: u32 = 1;
-    let mut btnA_prev = false;
-    let mut btnB_prev = false;
+    let mut offset: isize = 0;
     loop {
-        let btns_value;
         unsafe {
-            btns_value = BTNS.read_volatile();
-        }
-        let btnA = (btns_value & 0b00000001) > 0;
-        let btnB = (btns_value & 0b00000010) > 0;
-        if btnA && !btnA_prev {
-            value >>= 1;
-        } else if btnB && !btnB_prev {
-            value <<= 1;
+            SCREEN.offset(offset).write_volatile(value);
         }
+        value <<= 1;
+        offset += 1;
         if value == 0 {
             panic!();
         }
-        unsafe {
-            OUTPUT.write_volatile(value);
-        }
-        btnA_prev = btnA;
-        btnB_prev = btnB;
     }
 }