1e6165e04b
* Runtime ISR binding and simple public API docs for RTC * changelog * import dependencies instead of using full paths
55 lines
1.5 KiB
Rust
55 lines
1.5 KiB
Rust
//! This demos a simple monitor for the XTAL frequency, by relying on a special
|
|
//! feature of the TIMG0 (Timer Group 0). This feature counts the number of XTAL
|
|
//! clock cycles within a given number of RTC_SLOW_CLK cycles.
|
|
|
|
//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
|
|
|
|
#![no_std]
|
|
#![no_main]
|
|
|
|
use core::cell::RefCell;
|
|
|
|
use critical_section::Mutex;
|
|
use esp_backtrace as _;
|
|
use esp_hal::{clock::ClockControl, peripherals::Peripherals, prelude::*, rtc_cntl::Rtc};
|
|
use esp_println::println;
|
|
|
|
static RTC: Mutex<RefCell<Option<Rtc>>> = Mutex::new(RefCell::new(None));
|
|
|
|
#[entry]
|
|
fn main() -> ! {
|
|
let peripherals = Peripherals::take();
|
|
let system = peripherals.SYSTEM.split();
|
|
let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
|
|
|
|
let mut rtc = Rtc::new(peripherals.LPWR, Some(interrupt_handler));
|
|
rtc.rwdt.set_timeout(2000.millis());
|
|
rtc.rwdt.listen();
|
|
|
|
println!(
|
|
"{: <10} XTAL frequency: {} MHz",
|
|
"[Expected]",
|
|
clocks.xtal_clock.to_MHz()
|
|
);
|
|
|
|
critical_section::with(|cs| RTC.borrow_ref_mut(cs).replace(rtc));
|
|
|
|
loop {}
|
|
}
|
|
|
|
#[handler(priority = esp_hal::interrupt::Priority::min())]
|
|
fn interrupt_handler() {
|
|
critical_section::with(|cs| {
|
|
let mut rtc = RTC.borrow_ref_mut(cs);
|
|
let rtc = rtc.as_mut().unwrap();
|
|
|
|
println!(
|
|
"{: <10} XTAL frequency: {} MHz",
|
|
"[Monitor]",
|
|
rtc.estimate_xtal_frequency()
|
|
);
|
|
|
|
rtc.rwdt.clear_interrupt();
|
|
});
|
|
}
|