From fa6f69cab4d65230b5178f8cfd6b74805adf8cf9 Mon Sep 17 00:00:00 2001
From: kirbylife <kirbylife@protonmail.com>
Date: Wed, 23 Nov 2022 23:07:44 -0600
Subject: [PATCH] Now the led blink
---
src/main.rs | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/src/main.rs b/src/main.rs
index 649be07..8ea7370 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,32 @@
+#![feature(asm_experimental_arch)]
#![no_std]
#![no_main]
+use core::arch::asm;
+use core::ptr::{read_volatile, write_volatile};
+
+const DDRB: *mut u8 = 0x24 as *mut u8;
+const PORTB: *mut u8 = 0x25 as *mut u8;
+
+const CPU_SPEED: u32 = 16_000_000;
+
#[no_mangle]
-pub extern "C" fn main() {}
+pub extern "C" fn main() -> ! {
+ unsafe { write_volatile(DDRB, 0b11111111) };
+
+ loop {
+ unsafe { write_volatile(PORTB, 0b00000000) };
+ sleep(1);
+ unsafe { write_volatile(PORTB, 0b00100000) };
+ sleep(1);
+ }
+}
+
+fn sleep(time: u32) {
+ for _ in 0..(CPU_SPEED / 10 * time) {
+ unsafe { asm!("nop") }
+ }
+}
#[panic_handler]
fn panic(_info: &::core::panic::PanicInfo) -> ! {