99bf346898
* Clean up passing clocks to drivers * Update changelog * Initialise Clocks in a critical section * Fix calling now() before init * Fix doc * Fix esp-wifi migration guide * Add safety comment * Update tests
58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
//! Uses timer0 and operator0 of the MCPWM0 peripheral to output a 50% duty
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//! signal at 20 kHz.
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//!
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//! The following wiring is assumed:
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//! - Output pin => GPIO0
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//% CHIPS: esp32 esp32c6 esp32h2 esp32s3
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#![no_std]
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#![no_main]
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use esp_backtrace as _;
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use esp_hal::{
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gpio::Io,
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mcpwm::{operator::PwmPinConfig, timer::PwmWorkingMode, McPwm, PeripheralClockConfig},
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prelude::*,
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};
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#[entry]
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fn main() -> ! {
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let peripherals = esp_hal::init(esp_hal::Config::default());
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let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
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let pin = io.pins.gpio0;
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// initialize peripheral
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cfg_if::cfg_if! {
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if #[cfg(feature = "esp32h2")] {
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let freq = 40.MHz();
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} else {
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let freq = 32.MHz();
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}
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}
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let clock_cfg = PeripheralClockConfig::with_frequency(freq).unwrap();
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let mut mcpwm = McPwm::new(peripherals.MCPWM0, clock_cfg);
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// connect operator0 to timer0
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mcpwm.operator0.set_timer(&mcpwm.timer0);
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// connect operator0 to pin
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let mut pwm_pin = mcpwm
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.operator0
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.with_pin_a(pin, PwmPinConfig::UP_ACTIVE_HIGH);
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// start timer with timestamp values in the range of 0..=99 and a frequency of
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// 20 kHz
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let timer_clock_cfg = clock_cfg
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.timer_clock_with_frequency(99, PwmWorkingMode::Increase, 20.kHz())
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.unwrap();
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mcpwm.timer0.start(timer_clock_cfg);
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// pin will be high 50% of the time
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pwm_pin.set_timestamp(50);
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loop {}
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}
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