mirror of
https://github.com/italicsjenga/rp-hal-boards.git
synced 2024-10-17 22:41:30 +11:00
44019781e2
- Clippy warns about empty loops, https://github.com/rust-lang/rust-clippy/issues/6161 - wfi allows to CPU to save some power WFI was avoided in examples for fear of ill interactions with debuggers. However the rp2040 debug port does continue to work, as long as the relevant clocks are not disabled in SLEEP_EN0/SLEEP_EN1. (By default, all clocks stay enabled in sleep mode.) This patch replaces several different workarounds with just calling wfi.
61 lines
1.6 KiB
Rust
61 lines
1.6 KiB
Rust
//! This example toggles the GPIO25 pin, using a PIO program compiled via pio_proc::pio!().
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//!
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//! If a LED is connected to that pin, like on a Pico board, the LED should blink.
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#![no_std]
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#![no_main]
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use cortex_m_rt::entry;
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use hal::gpio::{FunctionPio0, Pin};
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use hal::pac;
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use hal::pio::PIOExt;
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use hal::Sio;
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use panic_halt as _;
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use rp2040_hal as hal;
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#[link_section = ".boot2"]
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#[used]
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pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
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#[entry]
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fn main() -> ! {
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let mut pac = pac::Peripherals::take().unwrap();
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let sio = Sio::new(pac.SIO);
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let pins = hal::gpio::Pins::new(
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pac.IO_BANK0,
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pac.PADS_BANK0,
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sio.gpio_bank0,
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&mut pac.RESETS,
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);
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// configure LED pin for Pio0.
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let _led: Pin<_, FunctionPio0> = pins.gpio25.into_mode();
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// PIN id for use inside of PIO
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let led_pin_id = 25;
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// Define some simple PIO program.
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let program = pio_proc::pio_asm!(
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".wrap_target",
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"set pins, 1 [31]",
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"set pins, 0 [31]",
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".wrap"
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);
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// Initialize and start PIO
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let (mut pio, sm0, _, _, _) = pac.PIO0.split(&mut pac.RESETS);
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let installed = pio.install(&program.program).unwrap();
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let div = 0f32; // as slow as possible (0 is interpreted as 65536)
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let (mut sm, _, _) = rp2040_hal::pio::PIOBuilder::from_program(installed)
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.set_pins(led_pin_id, 1)
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.clock_divisor(div)
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.build(sm0);
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// The GPIO pin needs to be configured as an output.
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sm.set_pindirs([(led_pin_id, hal::pio::PinDir::Output)]);
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sm.start();
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// PIO runs in background, independently from CPU
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loop {
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cortex_m::asm::wfi();
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}
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}
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