Starts adding fontplate for VGA

bench/programs_rust/hello-rust/src/main.rs

@@ -3,7 +3,11 @@
 
 use core::arch::asm;
 
-use fpga_lib::{panic_handler, register::X31};
+use fpga_lib::{
+    panic_handler,
+    register::X31,
+    vga::{VGA, WHITE},
+};
 
 panic_handler! {}
 
@@ -17,9 +21,7 @@ pub extern "C" fn _start() -> ! {
             "add x31, x0, {}", in(reg) test
         );
 
-        const VGA: *mut u8 = 0x80000000 as *mut u8;
-        VGA.write_volatile(255);
-        // VGA.add(1).write_volatile(255);
+        VGA::write_pixel_unsafe(0, 0, WHITE);
     }
 
     loop {}