mirror of
https://github.com/esp-rs/esp-hal.git
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14ac8c3c80
* feat: ✨ Enable RMT peripheral * feat: ✨ Rename RMT GPIOs * feat: ✨ Add clock source, ram size and ram start * feat: ✨ Rename GPIOs * feat: ✨ Add pulse_control example * fix: 🐛 Fix example clock * feat: ✨ Initial support for H2 * fix: 📝 Fix typo * ci: ✨ Enable check on H2 * build: 📌 Update esp-pac revision, use fork * docs: 📝 Update example documentation * docs: 📝 Add todo * docs: 📝 Update changelog * feat: ✨ Add ram example * build: 📌 Update H2 PAC * docs: 📝 Remove todo
88 lines
2.3 KiB
Rust
88 lines
2.3 KiB
Rust
//! RMT / PulseControl
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//!
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//! Folowing pins are used:
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//! GPIO4 (RMT channel 0)
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//!
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//! Depending on your target and the board you are using you have to change the
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//! pins.
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//!
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//! This is an example of generating pulses. Attach a Logic Analyzer to the RTM
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//! channel 0 pin to see the gerated signal.
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#![no_std]
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#![no_main]
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use esp32s2_hal::{
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clock::ClockControl,
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gpio::IO,
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peripherals::Peripherals,
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prelude::*,
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pulse_control::{ConfiguredChannel, OutputChannel, PulseCode, RepeatMode},
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timer::TimerGroup,
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PulseControl,
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Rtc,
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};
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use esp_backtrace as _;
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#[entry]
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fn main() -> ! {
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let peripherals = Peripherals::take();
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let mut 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(
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peripherals.TIMG0,
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&clocks,
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&mut system.peripheral_clock_control,
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);
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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 io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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// Configure RMT peripheral globally
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let pulse = PulseControl::new(peripherals.RMT, &mut system.peripheral_clock_control).unwrap();
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let mut rmt_channel0 = pulse.channel0;
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// Set up channel
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rmt_channel0
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.set_idle_output_level(false)
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.set_carrier_modulation(false)
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.set_channel_divider(1)
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.set_idle_output(true);
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// Assign GPIO pin where pulses should be sent to
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let mut rmt_channel0 = rmt_channel0.assign_pin(io.pins.gpio4);
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// Create pulse sequence
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let mut seq = [PulseCode {
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level1: true,
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length1: 0u32.nanos(),
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level2: false,
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length2: 0u32.nanos(),
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}; 128];
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// -1 to make sure that the last element is a transmission end marker (i.e.
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// lenght 0)
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for i in 0..(seq.len() - 1) {
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seq[i] = PulseCode {
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level1: true,
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length1: (10u32 * (i as u32 + 1u32)).nanos(),
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level2: false,
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length2: 60u32.nanos(),
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};
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}
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loop {
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// Send sequence
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rmt_channel0
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.send_pulse_sequence(RepeatMode::SingleShot, &seq)
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.unwrap();
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}
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}
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