mirror of
https://github.com/esp-rs/esp-hal.git
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be184a552d
* CS impl * use CS Mutex in C3 examples * use CS Mutex in S2 examples * Update esp32 example * run fmt * Update S3 examples * Remove uses of unsafe where no longer required * use esp_backtrace in examples * fix import & fmt once more * Bump MSRV to 1.60.0 Co-authored-by: Jesse Braham <jesse@beta7.io>
110 lines
2.9 KiB
Rust
110 lines
2.9 KiB
Rust
//! This shows how to use the SYSTIMER peripheral including interrupts.
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//! It's an additional timer besides the TIMG peripherals.
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#![no_std]
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#![no_main]
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use core::cell::RefCell;
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use critical_section::Mutex;
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use esp32s2_hal::{
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clock::ClockControl,
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interrupt,
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interrupt::Priority,
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pac::{self, Peripherals},
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prelude::*,
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systimer::{Alarm, SystemTimer, Target},
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timer::TimerGroup,
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Delay,
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Rtc,
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};
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use esp_backtrace as _;
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use xtensa_lx_rt::entry;
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static ALARM0: Mutex<RefCell<Option<Alarm<Target, 0>>>> = Mutex::new(RefCell::new(None));
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static ALARM1: Mutex<RefCell<Option<Alarm<Target, 1>>>> = Mutex::new(RefCell::new(None));
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static ALARM2: Mutex<RefCell<Option<Alarm<Target, 2>>>> = Mutex::new(RefCell::new(None));
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#[entry]
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fn main() -> ! {
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let peripherals = Peripherals::take().unwrap();
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let system = peripherals.SYSTEM.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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let timer_group0 = TimerGroup::new(peripherals.TIMG0, &clocks);
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let mut wdt = timer_group0.wdt;
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let mut rtc = Rtc::new(peripherals.RTC_CNTL);
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// Disable MWDT and RWDT (Watchdog) flash boot protection
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wdt.disable();
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rtc.rwdt.disable();
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let syst = SystemTimer::new(peripherals.SYSTIMER);
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let alarm0 = syst.alarm0;
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alarm0.set_target(40_000_0000);
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alarm0.enable_interrupt();
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let alarm1 = syst.alarm1;
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alarm1.set_target(41_111_1110);
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alarm1.enable_interrupt();
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let alarm2 = syst.alarm2;
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alarm2.set_target(42_222_2220 * 2);
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alarm2.enable_interrupt();
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critical_section::with(|cs| {
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ALARM0.borrow_ref_mut(cs).replace(alarm0);
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ALARM1.borrow_ref_mut(cs).replace(alarm1);
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ALARM2.borrow_ref_mut(cs).replace(alarm2);
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});
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interrupt::enable(pac::Interrupt::SYSTIMER_TARGET0, Priority::Priority1).unwrap();
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interrupt::enable(pac::Interrupt::SYSTIMER_TARGET1, Priority::Priority2).unwrap();
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interrupt::enable(pac::Interrupt::SYSTIMER_TARGET2, Priority::Priority2).unwrap();
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// Initialize the Delay peripheral, and use it to toggle the LED state in a
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// loop.
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let mut delay = Delay::new(&clocks);
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loop {
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delay.delay_ms(500u32);
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}
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}
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#[interrupt]
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fn SYSTIMER_TARGET0() {
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esp_println::println!("Interrupt lvl1 (alarm0)");
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critical_section::with(|cs| {
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ALARM0
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.borrow_ref_mut(cs)
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.as_mut()
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.unwrap()
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.clear_interrupt()
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});
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}
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#[interrupt]
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fn SYSTIMER_TARGET1() {
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esp_println::println!("Interrupt lvl2 (alarm1)");
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critical_section::with(|cs| {
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ALARM1
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.borrow_ref_mut(cs)
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.as_mut()
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.unwrap()
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.clear_interrupt()
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});
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}
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#[interrupt]
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fn SYSTIMER_TARGET2() {
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esp_println::println!("Interrupt lvl2 (alarm2)");
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critical_section::with(|cs| {
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ALARM2
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.borrow_ref_mut(cs)
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.as_mut()
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.unwrap()
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.clear_interrupt()
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});
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}
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