Test screen r/w

lwcpu/src/lib.rs

@@ -2,21 +2,21 @@
 
 use core::ptr::{read_volatile, write_volatile};
 
-const BASE_POINTER: u32 = 0x1000_0000;
+pub const BASE_POINTER: u32 = 0x1000_0000;
 
-const NUMBER_DISPLAY_OFFSET: u32 = 0x00;
-const RANDOM_NUMBER_OFFSET: u32 = 0x04;
-const BUTTONS_OFFSET: u32 = 0x08;
-const TEXT_DISPLAY_OFFSET: u32 = 0x0C;
-const KEYBOARD_OFFSET: u32 = 0x10;
-const SCREEN_OFFSET: u32 = 0x80;
+pub const NUMBER_DISPLAY_OFFSET: u32 = 0x00;
+pub const RANDOM_NUMBER_OFFSET: u32 = 0x04;
+pub const BUTTONS_OFFSET: u32 = 0x08;
+pub const TEXT_DISPLAY_OFFSET: u32 = 0x0C;
+pub const KEYBOARD_OFFSET: u32 = 0x10;
+pub const SCREEN_OFFSET: u32 = 0x80;
 
-const NUMBER_DISPLAY_POINTER: *mut u32 = (BASE_POINTER + NUMBER_DISPLAY_OFFSET) as *mut u32;
-const RANDOM_NUMBER_POINTER: *mut u32 = (BASE_POINTER + RANDOM_NUMBER_OFFSET) as *mut u32;
-const BUTTONS_POINTER: *mut u8 = (BASE_POINTER + BUTTONS_OFFSET) as *mut u8;
-const TEXT_DISPLAY_POINTER: *mut u8 = (BASE_POINTER + TEXT_DISPLAY_OFFSET) as *mut u8;
-const KEYBOARD_POINTER: *mut u32 = (BASE_POINTER + KEYBOARD_OFFSET) as *mut u32;
-const SCREEN_POINTER: *mut u32 = (BASE_POINTER + SCREEN_OFFSET) as *mut u32;
+pub const NUMBER_DISPLAY_POINTER: *mut u32 = (BASE_POINTER + NUMBER_DISPLAY_OFFSET) as *mut u32;
+pub const RANDOM_NUMBER_POINTER: *mut u32 = (BASE_POINTER + RANDOM_NUMBER_OFFSET) as *mut u32;
+pub const BUTTONS_POINTER: *mut u8 = (BASE_POINTER + BUTTONS_OFFSET) as *mut u8;
+pub const TEXT_DISPLAY_POINTER: *mut u8 = (BASE_POINTER + TEXT_DISPLAY_OFFSET) as *mut u8;
+pub const KEYBOARD_POINTER: *mut u32 = (BASE_POINTER + KEYBOARD_OFFSET) as *mut u32;
+pub const SCREEN_POINTER: *mut u32 = (BASE_POINTER + SCREEN_OFFSET) as *mut u32;
 
 pub struct Screen {}
 impl Screen {

test/src/main.rs

@@ -1,8 +1,8 @@
 #![no_std]
 #![no_main]
 
-use core::{fmt::Write, panic::PanicInfo};
-use lwcpu::{NumberDisplay, TextDisplay};
+use core::{fmt::Write, panic::PanicInfo, ptr::{read_volatile, write_volatile}};
+use lwcpu::{NumberDisplay, TextDisplay, SCREEN_POINTER};
 use riscv_rt::entry;
 
 #[panic_handler]
@@ -18,6 +18,13 @@ const HELLO_WORLD: &str = " Hello world!";
 #[entry]
 fn main() -> ! {
     let mut text = TextDisplay{};
+    unsafe {
+        write_volatile(SCREEN_POINTER, 0x001166ff);
+        write_volatile(SCREEN_POINTER.offset(1), 0xAAAAAAAA);
+        let ptr = SCREEN_POINTER as *mut u8;
+        let b = read_volatile(ptr.offset(1));
+        write_volatile(ptr.offset(5), b);
+    }
     loop {
         let _ = text.write_str(HELLO_WORLD);
         panic!("Lmao")