f278ec36b1
* Stable rust in setup * Version WIP * Update panics * fix1 * manual fixes * autofix * bump * finish * More stable fixes * Stable nb block and editions
56 lines
1.8 KiB
Rust
56 lines
1.8 KiB
Rust
#![no_std]
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#![no_main]
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extern crate panic_halt;
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extern crate cortex_m_rt as rt;
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extern crate microbit;
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use core::fmt::Write;
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use rt::entry;
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use microbit::hal::prelude::*;
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use microbit::hal::serial;
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use microbit::hal::serial::BAUD115200;
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#[entry]
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fn main() -> ! {
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if let Some(p) = microbit::Peripherals::take() {
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// Split GPIO
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let gpio = p.GPIO.split();
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// Configure RX and TX pins accordingly
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let tx = gpio.pin24.into_push_pull_output().downgrade();
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let rx = gpio.pin25.into_floating_input().downgrade();
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// Configure serial communication
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let (mut tx, _) = serial::Serial::uart0(p.UART0, tx, rx, BAUD115200).split();
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// Configure button GPIOs as inputs
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let button_a = gpio.pin17.into_floating_input();
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let button_b = gpio.pin26.into_floating_input();
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// loop variables
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let mut state_a_low = false;
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let mut state_b_low = false;
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loop {
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// Get button states
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let button_a_low = button_a.is_low();
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let button_b_low = button_b.is_low();
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if button_a_low && !state_a_low {
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writeln!(tx, "Button A down").unwrap();
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}
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if button_b_low && !state_b_low {
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writeln!(tx, "Button B down").unwrap();
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}
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if !button_a_low && state_a_low {
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writeln!(tx, "Button A up").unwrap();
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}
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if !button_b_low && state_b_low {
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writeln!(tx, "Button B up").unwrap();
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}
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// Store buttons states
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// This should not read the GPIO pins again, as the state
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// may have changed and the change will not be recorded
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state_a_low = button_a_low;
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state_b_low = button_b_low;
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}
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}
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panic!("End");
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}
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