Serial write actions should be blocking
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@ -10,6 +10,7 @@ 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::block;
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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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@ -109,12 +110,12 @@ const APP: () = {
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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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block!(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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resources.serial_tx.write(b'\n').unwrap();
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block!(resources.serial_tx.write(b'\n')).unwrap();
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match &buffer[..] {
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b"flip" => {
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resources.led_cycle.reverse();
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