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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>
79 lines
2.1 KiB
Rust
79 lines
2.1 KiB
Rust
//! This demos basic usage of RMT / PulseControl
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//! Use a logic analyzer to see the generated pulses.
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//! The correct output is only achieved when running in release mode.
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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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gpio::IO,
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pac::Peripherals,
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prelude::*,
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pulse_control::{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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use xtensa_lx_rt::entry;
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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 mut 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 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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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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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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esp_println::println!("Start");
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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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