2017-05-04 17:35:26 +08:00
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#![feature(used, const_fn)]
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#![no_std]
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#[macro_use]
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extern crate cortex_m;
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extern crate cortex_m_rt;
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extern crate tm4c129x;
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use core::cell::Cell;
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use cortex_m::ctxt::Local;
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use cortex_m::exception::Handlers as ExceptionHandlers;
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use tm4c129x::interrupt::Handlers as InterruptHandlers;
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2017-05-04 18:59:35 +08:00
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const LED1: u8 = 0x10;
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const LED2: u8 = 0x40;
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fn set_led(nr: u8, state: bool) {
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cortex_m::interrupt::free(|cs| {
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let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
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if state {
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gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() | nr))
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} else {
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gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() & !nr))
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}
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});
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}
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2017-05-04 17:35:26 +08:00
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fn main() {
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hprintln!("Hello, world!");
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cortex_m::interrupt::free(|cs| {
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let systick = tm4c129x::SYST.borrow(cs);
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let sysctl = tm4c129x::SYSCTL.borrow(cs);
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let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
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2017-05-04 18:59:35 +08:00
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// Bring up GPIO port K
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sysctl.rcgcgpio.modify(|_, w| w.r9().bit(true));
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while !sysctl.prgpio.read().r9().bit() {}
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// Set up LEDs
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gpio_k.dir.write(|w| w.dir().bits(LED1|LED2));
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gpio_k.den.write(|w| w.den().bits(LED1|LED2));
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2017-05-04 17:35:26 +08:00
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// Set up system timer
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systick.set_reload(systick.get_ticks_per_10ms());
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systick.enable_counter();
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systick.enable_interrupt();
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});
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}
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use cortex_m::exception::SysTick;
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extern fn sys_tick(ctxt: SysTick) {
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static ELAPSED: Local<Cell<u32>, SysTick> = Local::new(Cell::new(0));
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let elapsed = ELAPSED.borrow(&ctxt);
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elapsed.set(elapsed.get() + 1);
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2017-05-04 18:59:35 +08:00
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if elapsed.get() % 100 == 0 {
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set_led(LED1, true);
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set_led(LED2, false);
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}
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if elapsed.get() % 100 == 50 {
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set_led(LED1, false);
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set_led(LED2, true);
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}
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2017-05-04 17:35:26 +08:00
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}
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#[used]
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#[link_section = ".rodata.exceptions"]
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pub static EXCEPTIONS: ExceptionHandlers = ExceptionHandlers {
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sys_tick: sys_tick,
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..cortex_m::exception::DEFAULT_HANDLERS
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};
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#[used]
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#[link_section = ".rodata.interrupts"]
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pub static INTERRUPTS: InterruptHandlers = InterruptHandlers {
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..tm4c129x::interrupt::DEFAULT_HANDLERS
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};
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