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>
106 lines
2.9 KiB
Rust
106 lines
2.9 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 core::fmt::Write;
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use esp32_hal::{
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clock::ClockControl,
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macros::ram,
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pac::{Peripherals, UART0},
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prelude::*,
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timer::TimerGroup,
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Serial,
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};
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use esp_backtrace as _;
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use nb::block;
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use xtensa_lx_rt::entry;
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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().unwrap();
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let system = peripherals.DPORT.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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let mut wdt = timer_group0.wdt;
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let mut serial0 = Serial::new(peripherals.UART0);
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// Disable MWDT flash boot protection
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wdt.disable();
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// The RWDT flash boot protection remains enabled and it being triggered is part
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// of the example
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timer0.start(1u64.secs());
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writeln!(
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serial0,
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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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.unwrap();
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unsafe {
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writeln!(serial0, "SOME_INITED_DATA {:x?}", SOME_INITED_DATA).unwrap();
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writeln!(serial0, "SOME_UNINITED_DATA {:x?}", SOME_UNINITED_DATA).unwrap();
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writeln!(serial0, "SOME_ZEROED_DATA {:x?}", SOME_ZEROED_DATA).unwrap();
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SOME_INITED_DATA[0] = 0xff;
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SOME_ZEROED_DATA[0] = 0xff;
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writeln!(serial0, "SOME_INITED_DATA {:x?}", SOME_INITED_DATA).unwrap();
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writeln!(serial0, "SOME_UNINITED_DATA {:x?}", SOME_UNINITED_DATA).unwrap();
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writeln!(serial0, "SOME_ZEROED_DATA {:x?}", SOME_ZEROED_DATA).unwrap();
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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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writeln!(serial0, "Counter {}", SOME_UNINITED_DATA[1]).unwrap();
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SOME_UNINITED_DATA[1] += 1;
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}
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writeln!(
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serial0,
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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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.unwrap();
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writeln!(serial0, "Result {}", function_in_rtc_ram()).unwrap();
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loop {
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function_in_ram(&mut serial0);
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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(serial0: &mut Serial<UART0>) {
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writeln!(serial0, "Hello world!").unwrap();
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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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