85 lines
1.7 KiB
Markdown
85 lines
1.7 KiB
Markdown
# Ruduino
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This library provides a set of reusable components for the Arduino Uno.
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## Overview
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### Register and bit definitions
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```rust
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use arduino::PORTB; // Register
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use arduino::PORTB7; // Pin
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```
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### Prelude
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Disable interrupts.
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```rust
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without_interrupts(|| {
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unsafe { write_volatile(DDRB, 0xFF) }
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})
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```
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### Timers
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Configure a timer.
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```rust
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const CPU_FREQUENCY_HZ: u64 = 16_000_000;
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const DESIRED_HZ_TIM1: f64 = 2.0;
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const TIM1_PRESCALER: u64 = 1024;
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const INTERRUPT_EVERY_1_HZ_1024_PRESCALER: u16 =
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((CPU_FREQUENCY_HZ as f64 / (DESIRED_HZ_TIM1 * TIM1_PRESCALER as f64)) as u64 - 1) as u16;
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timer1::Timer::new()
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.waveform_generation_mode(timer1::WaveformGenerationMode::ClearOnTimerMatchOutputCompare)
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.clock_source(timer1::ClockSource::Prescale1024)
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.output_compare_1(Some(INTERRUPT_EVERY_1_HZ_1024_PRESCALER))
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.configure();
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```
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Set up an interrupt handler that will be called when the timer fires.
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```rust
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#[no_mangle]
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pub unsafe extern "avr-interrupt" fn _ivr_timer1_compare_a() {
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let prev_value = read_volatile(PORTB);
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write_volatile(PORTB, prev_value ^ PINB5);
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}
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```
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### Hardware Serial Port
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Configure the serial port.
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```rust
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const CPU_FREQUENCY_HZ: u64 = 16_000_000;
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const BAUD: u64 = 9600;
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const UBRR: u16 = (CPU_FREQUENCY_HZ / 16 / BAUD - 1) as u16;
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serial::Serial::new(UBRR)
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.character_size(serial::CharacterSize::EightBits)
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.mode(serial::Mode::Asynchronous)
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.parity(serial::Parity::Disabled)
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.stop_bits(serial::StopBits::OneBit)
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.configure();
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```
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Transmit a sequence of bytes.
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```rust
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for &b in b"OK" {
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serial::transmit(b);
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}
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```
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Read a byte if there's something available.
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```rust
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if let Some(b) = serial::try_receive() {
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serial::transmit(b);
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serial::transmit(b);
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}
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```
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