M-Labs/ionpak-thermostat
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systick: use mutex

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This commit is contained in:
Astro 2019-09-08 02:13:02 +02:00
parent 225f3754a1
commit 4249addba2
4 changed files with 19 additions and 11 deletions
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1
firmware/Cargo.lock generated
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@ -128,6 +128,7 @@ dependencies = [
name = "ionpak-firmware"
version = "1.0.0"
dependencies = [
"bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
"bit_field 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
"byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
"cortex-m 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",

1
firmware/Cargo.toml
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@ -18,6 +18,7 @@ nb = "0.1"
cortex-m-semihosting = "0.3"
byteorder = { version = "1.3", default-features = false }
bit_field = "0.10"
bare-metal = "0.2"
[dependencies.smoltcp]
git = "https://github.com/m-labs/smoltcp"

4
firmware/src/board/mod.rs
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@ -9,7 +9,7 @@ pub mod systick;
const UART_DIV: u32 = (((/*sysclk*/120_000_000 * 8) / /*baud*/115200) + 1) / 2;
pub fn init() {
cortex_m::interrupt::free(|_cs| {
cortex_m::interrupt::free(|cs| {
let sysctl = unsafe { &*tm4c129x::SYSCTL::ptr() };
// Set up main oscillator
@ -170,7 +170,7 @@ pub fn init() {
setup_timer_pwm!(TIMER4);
setup_timer_pwm!(TIMER5);
systick::init();
systick::init(cs);
});
}

24
firmware/src/board/systick.rs
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@ -1,16 +1,17 @@
use cortex_m_rt::exception;
use core::cell::RefCell;
use cortex_m::interrupt::Mutex;
use cortex_m::peripheral::{SYST, syst::SystClkSource};
use cortex_m_rt::exception;
use bare_metal::CriticalSection;
const SYSTICK_RATE: u32 = 1000;
const SYSTICK_RATE: u32 = 250;
static mut TIME: u64 = 0;
static mut TIME: Mutex<RefCell<u64>> = Mutex::new(RefCell::new(0));
pub fn init() {
unsafe { TIME = 0 };
pub fn init(cs: &CriticalSection) {
#[allow(mutable_transmutes)]
let syst: &mut SYST = unsafe { core::mem::transmute(&*SYST::ptr()) };
syst.set_clock_source(SystClkSource::Core);
syst.set_clock_source(SystClkSource::External);
syst.set_reload(100 * SYST::get_ticks_per_10ms() / SYSTICK_RATE);
syst.clear_current();
syst.enable_interrupt();
@ -19,9 +20,14 @@ pub fn init() {
#[exception]
unsafe fn SysTick() {
TIME += u64::from(1000 / SYSTICK_RATE);
let interval = u64::from(1000 / SYSTICK_RATE);
cortex_m::interrupt::free(|cs| {
TIME.borrow(cs).replace_with(|time| *time + interval);
});
}
pub fn get_time() -> u64 {
unsafe { TIME }
cortex_m::interrupt::free(|cs| {
*unsafe { &mut TIME }.borrow(cs).borrow()
})
}