147 lines
4.5 KiB
Rust
147 lines
4.5 KiB
Rust
#![deny(unsafe_code)]
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#![deny(warnings)]
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#![no_main]
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#![no_std]
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extern crate panic_semihosting;
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mod led;
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use crate::led::{Led, LedCycle};
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use core::fmt::Write;
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use cortex_m_semihosting::hprintln;
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use hal::gpio::{Edge, ExtiPin, Floating, Input};
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use hal::prelude::*;
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use hal::serial::{self, config::Config as SerialConfig, Serial};
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use hal::stm32::{EXTI, USART1};
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use heapless::consts::U8;
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use heapless::Vec;
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use rtfm::app;
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type SerialTx = hal::serial::Tx<USART1>;
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type SerialRx = hal::serial::Rx<USART1>;
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type UserButton = hal::gpio::gpioa::PA0<Input<Floating>>;
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#[app(device = hal::stm32)]
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const APP: () = {
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static mut button: UserButton = ();
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static mut buffer: Vec<u8, U8> = ();
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static mut led_cycle: LedCycle = ();
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static mut exti: EXTI = ();
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static mut serial_rx: SerialRx = ();
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static mut serial_tx: SerialTx = ();
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#[init(spawn = [switch_leds])]
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fn init() -> init::LateResources {
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// Set up the LEDs and spawn the LEDs switch task.
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let gpiod = device.GPIOD.split();
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let leds = [
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gpiod.pd12.into_push_pull_output().downgrade(),
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gpiod.pd13.into_push_pull_output().downgrade(),
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gpiod.pd14.into_push_pull_output().downgrade(),
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gpiod.pd15.into_push_pull_output().downgrade(),
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];
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let led_cycle = LedCycle::from(leds);
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spawn.switch_leds().unwrap();
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// Set up the EXTI0 interrup for the user button.
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let mut exti = device.EXTI;
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let gpioa = device.GPIOA.split();
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let mut button = gpioa.pa0.into_floating_input();
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button.enable_interrupt(&mut exti);
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button.trigger_on_edge(&mut exti, Edge::RISING);
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// Set up the serial interface.
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let tx = gpioa.pa9.into_alternate_af7();
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let rx = gpioa.pa10.into_alternate_af7();
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let config = SerialConfig::default();
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let rcc = device.RCC.constrain();
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let clocks = rcc.cfgr.freeze();
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let mut serial = Serial::usart1(device.USART1, (tx, rx), config, clocks).unwrap();
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serial.listen(serial::Event::Rxne);
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let (serial_tx, serial_rx) = serial.split();
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// Set up the serial interface command buffer.
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let buffer = Vec::new();
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init::LateResources {
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button,
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buffer,
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exti,
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led_cycle,
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serial_tx,
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serial_rx,
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}
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}
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#[task(schedule = [switch_leds], resources = [led_cycle])]
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fn switch_leds() {
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resources.led_cycle.lock(|led_cycle| {
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if led_cycle.enabled {
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led_cycle.advance();
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schedule
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.switch_leds(scheduled + LedCycle::PERIOD.cycles())
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.unwrap();
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}
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});
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}
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#[interrupt(binds = EXTI0, resources = [button, exti, led_cycle])]
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fn button_pressed() {
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resources.led_cycle.lock(|led_cycle| led_cycle.reverse());
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resources.button.clear_interrupt_pending_bit(resources.exti);
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}
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#[interrupt(
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binds = USART1,
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priority = 2,
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resources = [buffer, led_cycle, serial_rx, serial_tx],
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spawn = [switch_leds]
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)]
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fn handle_serial() {
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let buffer = resources.buffer;
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// Read a byte from the serial port and write it back.
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let byte = resources.serial_rx.read().unwrap();
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resources.serial_tx.write(byte).unwrap();
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//hprintln!("serial: {}", byte).unwrap();
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// Handle the command in the buffer for newline, otherwise append to the buffer.
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if byte == b'\r' {
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match &buffer[..] {
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b"flip" => {
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resources.led_cycle.reverse();
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}
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b"stop" => {
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resources.led_cycle.disable();
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}
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b"start" => {
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resources.led_cycle.enable();
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spawn.switch_leds().unwrap();
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}
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b"off" => {
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resources.led_cycle.disable();
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resources.led_cycle.all_off();
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}
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b"on" => {
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resources.led_cycle.disable();
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resources.led_cycle.all_on();
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}
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_ => {}
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}
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buffer.clear();
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} else {
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if buffer.push(byte).is_err() {
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hprintln!("Serial read buffer full!").unwrap();
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}
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//hprintln!("buffer: {:?}", buffer).unwrap();
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}
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}
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extern "C" {
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fn TIM2();
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}
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};
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