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https://github.com/italicsjenga/rp-hal-boards.git
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803f582e0f
* Add BSP for Seeeduino XIAO RP2040 * Add missing link target * Add top-level README mention of XIAO RP2040
135 lines
3.8 KiB
Rust
135 lines
3.8 KiB
Rust
//! # Seeeduino XIAO RP2040 Blinky Example
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//!
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//! Blinks the LED on a Seeeduino XIAO RP2040 16MB board.
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//!
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//! This will blink an LED attached to GPIO25, which is the pin the XIAO RP2040
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//! uses for the on-board LED.
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//!
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//! See the `Cargo.toml` file for Copyright and license details.
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#![no_std]
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#![no_main]
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// The macro for our start-up function
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use seeeduino_xiao_rp2040::entry;
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// GPIO traits
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use embedded_hal::digital::v2::OutputPin;
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use embedded_hal::PwmPin;
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// Time handling traits
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use embedded_time::rate::*;
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// Ensure we halt the program on panic (if we don't mention this crate it won't
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// be linked)
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use panic_halt as _;
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// Pull in any important traits
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use seeeduino_xiao_rp2040::hal::prelude::*;
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// A shorter alias for the Peripheral Access Crate, which provides low-level
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// register access
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use seeeduino_xiao_rp2040::hal::pac;
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// A shorter alias for the Hardware Abstraction Layer, which provides
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// higher-level drivers.
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use seeeduino_xiao_rp2040::hal;
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// The minimum PWM value (i.e. LED brightness) we want
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const LOW: u16 = 0;
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// The maximum PWM value (i.e. LED brightness) we want
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const HIGH: u16 = 60000;
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/// Entry point to our bare-metal application.
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///
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/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
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/// as soon as all global variables are initialised.
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///
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/// The function configures the RP2040 peripherals, then blinks the LED in an
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/// infinite loop.
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#[entry]
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fn main() -> ! {
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// Grab our singleton objects
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let mut pac = pac::Peripherals::take().unwrap();
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let core = pac::CorePeripherals::take().unwrap();
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// Set up the watchdog driver - needed by the clock setup code
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let mut watchdog = hal::Watchdog::new(pac.WATCHDOG);
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// Configure the clocks
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//
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// The default is to generate a 125 MHz system clock
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let clocks = hal::clocks::init_clocks_and_plls(
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seeeduino_xiao_rp2040::XOSC_CRYSTAL_FREQ,
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pac.XOSC,
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pac.CLOCKS,
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pac.PLL_SYS,
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pac.PLL_USB,
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&mut pac.RESETS,
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&mut watchdog,
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)
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.ok()
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.unwrap();
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// The single-cycle I/O block controls our GPIO pins
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let sio = hal::Sio::new(pac.SIO);
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// Set the pins up according to their function on this particular board
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let pins = seeeduino_xiao_rp2040::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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// The delay object lets us wait for specified amounts of time (in
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// milliseconds)
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let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().integer());
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// Init PWMs
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let mut pwm_slices = hal::pwm::Slices::new(pac.PWM, &mut pac.RESETS);
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// Configure PWM4
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let pwm = &mut pwm_slices.pwm0;
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pwm.set_ph_correct();
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pwm.enable();
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// Output channel B on PWM0 to the red LED pin, initially off
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let channel = &mut pwm.channel_b;
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channel.output_to(pins.led_red);
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channel.set_duty(u16::MAX);
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// Set the blue LED to be an output, initially off
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let mut led_blue_pin = pins.led_blue.into_push_pull_output();
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led_blue_pin.set_high().unwrap();
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// Turn off the green LED
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let mut led_green_pin = pins.led_green.into_push_pull_output();
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led_green_pin.set_high().unwrap();
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loop {
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// Blink blue LED at 1 Hz
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for _ in 0..5 {
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led_blue_pin.set_low().unwrap();
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delay.delay_ms(500);
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led_blue_pin.set_high().unwrap();
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delay.delay_ms(500);
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}
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// Ramp red LED brightness up
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for i in (LOW..=HIGH).skip(30) {
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delay.delay_us(100);
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channel.set_duty(u16::MAX - i);
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}
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// Ramp red LED brightness down
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for i in (LOW..=HIGH).rev().skip(30) {
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delay.delay_us(100);
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channel.set_duty(u16::MAX - i);
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}
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}
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}
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// End of file
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