ionpak-thermostat/src/main.rs

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3.4 KiB
Rust
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2017-05-04 17:35:26 +08:00
#![feature(used, const_fn)]
#![no_std]
#[macro_use]
extern crate cortex_m;
extern crate cortex_m_rt;
extern crate tm4c129x;
use core::cell::Cell;
use cortex_m::ctxt::Local;
use cortex_m::exception::Handlers as ExceptionHandlers;
use tm4c129x::interrupt::Handlers as InterruptHandlers;
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const LED1: u8 = 0x10;
const LED2: u8 = 0x40;
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const HV_PWM: u8 = 0x01;
const FV_PWM: u8 = 0x04;
const PWM_LOAD: u32 = /*pwmclk*/16_000_000 / /*freq*/100_000;
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fn set_led(nr: u8, state: bool) {
cortex_m::interrupt::free(|cs| {
let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
if state {
gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() | nr))
} else {
gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() & !nr))
}
});
}
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fn set_fv_pwm(duty: u8) {
}
fn set_hv_pwm(duty: u8) {
}
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fn main() {
hprintln!("Hello, world!");
cortex_m::interrupt::free(|cs| {
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let sysctl = tm4c129x::SYSCTL.borrow(cs);
// Set up system timer
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let systick = tm4c129x::SYST.borrow(cs);
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systick.set_reload(systick.get_ticks_per_10ms());
systick.enable_counter();
systick.enable_interrupt();
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// Bring up GPIO port F and K
sysctl.rcgcgpio.modify(|_, w| w.r5().bit(true));
while !sysctl.prgpio.read().r5().bit() {}
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sysctl.rcgcgpio.modify(|_, w| w.r9().bit(true));
while !sysctl.prgpio.read().r9().bit() {}
// Set up LEDs
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let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
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gpio_k.dir.write(|w| w.dir().bits(LED1|LED2));
gpio_k.den.write(|w| w.den().bits(LED1|LED2));
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// Set up PWMs
let gpio_f = tm4c129x::GPIO_PORTF_AHB.borrow(cs);
gpio_f.dir.write(|w| w.dir().bits(HV_PWM|FV_PWM));
gpio_f.den.write(|w| w.den().bits(HV_PWM|FV_PWM));
gpio_f.afsel.write(|w| w.afsel().bits(HV_PWM|FV_PWM));
gpio_f.pctl.write(|w| unsafe { w.pmc0().bits(6).pmc2().bits(6) });
sysctl.rcgcpwm.modify(|_, w| w.r0().bit(true));
while !sysctl.prpwm.read().r0().bit() {}
let pwm0 = tm4c129x::PWM0.borrow(cs);
pwm0._0_gena.write(|w| w.actload().zero().actcmpad().one());
pwm0._0_load.write(|w| unsafe { w.bits(PWM_LOAD) });
pwm0._0_cmpa.write(|w| unsafe { w.bits(PWM_LOAD / 64) });
pwm0._0_ctl.write(|w| w.enable().bit(true));
pwm0._1_gena.write(|w| w.actload().zero().actcmpad().one());
pwm0._1_load.write(|w| unsafe { w.bits(PWM_LOAD) });
pwm0._1_cmpa.write(|w| unsafe { w.bits(PWM_LOAD / 32) });
pwm0._1_ctl.write(|w| w.enable().bit(true));
pwm0.enable.write(|w| w.pwm0en().bit(true).pwm2en().bit(true));
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});
}
use cortex_m::exception::SysTick;
extern fn sys_tick(ctxt: SysTick) {
static ELAPSED: Local<Cell<u32>, SysTick> = Local::new(Cell::new(0));
let elapsed = ELAPSED.borrow(&ctxt);
elapsed.set(elapsed.get() + 1);
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if elapsed.get() % 100 == 0 {
set_led(LED1, true);
set_led(LED2, false);
}
if elapsed.get() % 100 == 50 {
set_led(LED1, false);
set_led(LED2, true);
}
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}
#[used]
#[link_section = ".rodata.exceptions"]
pub static EXCEPTIONS: ExceptionHandlers = ExceptionHandlers {
sys_tick: sys_tick,
..cortex_m::exception::DEFAULT_HANDLERS
};
#[used]
#[link_section = ".rodata.interrupts"]
pub static INTERRUPTS: InterruptHandlers = InterruptHandlers {
..tm4c129x::interrupt::DEFAULT_HANDLERS
};