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https://github.com/esp-rs/esp-hal.git
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db409ffe7b
* Unify the system peripheral Whilst the PCR, SYSTEM and DPORT peripherals are different, we currently use them all in the same way. This PR unifies the peripheral name in the hal to `SYSTEM`. The idea is that they all do the same sort of thing, so we can collect them under the same name, and later down the line we can being to expose differences under an extended API. The benifits to this are imo quite big, the examples now are all identical, which makes things easier for esp-wifi, and paves a path towards the multichip hal. Why not do this in the PAC? Imo the pac should be as close to the hardware as possible, and the HAL is where we should abstractions such as this. * changelog
98 lines
2.5 KiB
Rust
98 lines
2.5 KiB
Rust
//! This shows how to use RTC memory.
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//! RTC memory is retained during resets and during most sleep modes.
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//! Initialized memory is always re-initialized on startup.
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//! Uninitialzed memory isn't initialized on startup and can be used to keep
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//! data during resets. Zeroed memory is initialized to zero on startup.
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//! We can also run code from RTC memory.
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#![no_std]
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#![no_main]
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use esp32_hal::{
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clock::ClockControl,
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macros::ram,
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peripherals::Peripherals,
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prelude::*,
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timer::TimerGroup,
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Rtc,
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};
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use esp_backtrace as _;
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use esp_println::println;
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use nb::block;
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#[ram(rtc_fast)]
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static mut SOME_INITED_DATA: [u8; 2] = [0xaa, 0xbb];
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#[ram(rtc_fast, uninitialized)]
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static mut SOME_UNINITED_DATA: [u8; 2] = [0; 2];
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#[ram(rtc_fast, zeroed)]
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static mut SOME_ZEROED_DATA: [u8; 8] = [0; 8];
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#[entry]
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fn main() -> ! {
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let peripherals = Peripherals::take();
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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 timer0 = timer_group0.timer0;
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// The RWDT flash boot protection must be enabled, as it is triggered as part of
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// the example.
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let mut rtc = Rtc::new(peripherals.RTC_CNTL);
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rtc.rwdt.enable();
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timer0.start(1u64.secs());
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println!(
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"IRAM function located at {:p}",
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function_in_ram as *const ()
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);
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unsafe {
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println!("SOME_INITED_DATA {:x?}", SOME_INITED_DATA);
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println!("SOME_UNINITED_DATA {:x?}", SOME_UNINITED_DATA);
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println!("SOME_ZEROED_DATA {:x?}", SOME_ZEROED_DATA);
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SOME_INITED_DATA[0] = 0xff;
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SOME_ZEROED_DATA[0] = 0xff;
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println!("SOME_INITED_DATA {:x?}", SOME_INITED_DATA);
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println!("SOME_UNINITED_DATA {:x?}", SOME_UNINITED_DATA);
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println!("SOME_ZEROED_DATA {:x?}", SOME_ZEROED_DATA);
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if SOME_UNINITED_DATA[0] != 0 {
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SOME_UNINITED_DATA[0] = 0;
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SOME_UNINITED_DATA[1] = 0;
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}
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if SOME_UNINITED_DATA[1] == 0xff {
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SOME_UNINITED_DATA[1] = 0;
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}
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println!("Counter {}", SOME_UNINITED_DATA[1]);
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SOME_UNINITED_DATA[1] += 1;
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}
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println!(
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"RTC_FAST function located at {:p}",
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function_in_rtc_ram as *const ()
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);
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println!("Result {}", function_in_rtc_ram());
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loop {
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function_in_ram();
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block!(timer0.wait()).unwrap();
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}
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}
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#[ram]
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fn function_in_ram() {
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println!("Hello world!");
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}
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#[ram(rtc_fast)]
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fn function_in_rtc_ram() -> u32 {
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42
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}
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