Skip to content

Instantly share code, notes, and snippets.

@thiagopnts
Created July 18, 2016 18:13
Show Gist options
  • Save thiagopnts/ef717d8612b92f0d8618fd19e734fb66 to your computer and use it in GitHub Desktop.
Save thiagopnts/ef717d8612b92f0d8618fd19e734fb66 to your computer and use it in GitHub Desktop.
#![feature(no_std, lang_items, start, core_intrinsics, asm)]
#![crate_type = "staticlib"]
#![no_std]
const GPIO_BASE: u32 = 0x20200000;
const TIMER_BASE: u32 = 0x20003000;
const LED_GPFSEL: isize = 4;
const LED_GPFBIT: isize = 21;
const LED_GPSET: isize = 8;
const LED_GPCLR: isize = 11;
const LED_GPIO_BIT: isize = 15;
#[no_mangle]
pub fn main() {
let gpio = GPIO_BASE as *const u32;
let counter_lo = (TIMER_BASE + 0x4) as *mut u32;
loop {
let ts = unsafe { *(counter_lo) as u32 };
while (unsafe { *(counter_lo) as u32 } - ts) < 500000 {
unsafe { asm!("") }
}
unsafe {
*(gpio.offset(LED_GPCLR) as *mut _) = 1 << LED_GPIO_BIT;
}
let ts = unsafe { *(counter_lo) as u32 };
while (unsafe { *(counter_lo) as u32 } - ts) < 500000 {
unsafe { asm!("") }
}
unsafe {
*(gpio.offset(LED_GPSET) as *mut _) = 1 << LED_GPIO_BIT;
}
}
}
#[lang = "rust_begin_unwind"] extern fn rust_begin_unwind() {}
#[lang = "eh_personality"] extern fn eh_personality() {}
#[lang = "panic_fmt"] extern fn panic_fmt() -> ! { loop {} }
#[no_mangle]
pub unsafe fn __aeabi_unwind_cpp_pr0() -> () {
loop {}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment