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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
50 lines
1.4 KiB
Rust
50 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 signal will be output to the pin assigned to `pin`. (GPIO4)
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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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mcpwm::{operator::PwmPinConfig, timer::PwmWorkingMode, PeripheralClockConfig, MCPWM},
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peripherals::Peripherals,
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prelude::*,
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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 system = peripherals.SYSTEM.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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let pin = io.pins.gpio4;
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// initialize peripheral
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let clock_cfg = PeripheralClockConfig::with_frequency(&clocks, 40u32.MHz()).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, 20u32.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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