Alternate arduino uno example

examples/arduino-uno/.cargo/config.toml

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+[build]
+target = "avr-atmega328p.json"
+
+[target.'cfg(target_arch = "avr")']
+runner = "./uno-runner.sh"
+
+[unstable]
+build-std = ["core"]

examples/arduino-uno/Cargo.toml

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+[package]
+name = "arduino-uno-hdd44780"
+version = "0.1.0"
+authors = ["Oliver Evans <[email protected]"]
+edition = "2018"
+
+[features]
+no-std = []
+default = ["no-std"]
+
+[dependencies]
+# A panic handler is needed.  This is a crate with the most basic one.
+# The `leonardo-panic` example shows a more elaborate version.
+embedded-hal = "0.2.4"
+numtoa = "0.2.3"
+hd44780-driver = "0.4.0"
+panic-halt = "0.2.0"
+
+[dependencies.arduino-uno]
+git = "https://github.com/Rahix/avr-hal"
+
+# Configure the build for minimal size
+[profile.dev]
+panic = "abort"
+lto = true
+opt-level = "s"
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+debug = true
+lto = true
+opt-level = "s"

examples/arduino-uno/README.md

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+# hd44780 Example for the Arduino Uno
+
+Based on `avr-hal` [arduino uno examples](https://github.com/Rahix/avr-hal/tree/master/boards/arduino-uno)
+
+## Circuit
+
+Based on Arduino LiquidCrystal [HelloWorld example](https://www.arduino.cc/en/Tutorial/HelloWorld?from=Tutorial.LiquidCrystal)
+
+![circuit-diagram](https://www.arduino.cc/en/uploads/Tutorial/LCD_Base_bb_Fritz.png)
+
+## Building
+```
+rustup override set nightly
+cargo build
+```
+
+## Flashing
+```
+cargo run
+```

examples/arduino-uno/avr-atmega328p.json

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+{
+  "llvm-target": "avr-unknown-unknown",
+  "cpu": "atmega328p",
+  "target-endian": "little",
+  "target-pointer-width": "16",
+  "target-c-int-width": "16",
+  "os": "unknown",
+  "target-env": "",
+  "target-vendor": "unknown",
+  "arch": "avr",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+
+  "executables": true,
+
+  "linker": "avr-gcc",
+  "linker-flavor": "gcc",
+  "pre-link-args": {
+    "gcc": ["-Os", "-mmcu=atmega328p"]
+  },
+  "exe-suffix": ".elf",
+  "post-link-args": {
+    "gcc": ["-Wl,--gc-sections"]
+  },
+
+  "singlethread": false,
+  "no-builtins": true,
+
+  "no-default-libraries": false,
+
+  "eh-frame-header": false
+}

examples/arduino-uno/src/main.rs

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+#![no_std]
+#![no_main]
+
+extern crate panic_halt;
+use arduino_uno::Delay;
+use hd44780_driver::{Cursor, CursorBlink, Display, DisplayMode, HD44780};
+use numtoa::NumToA;
+
+// This seems to be a magic number
+// https://docs.rs/hd44780-driver/0.4.0/hd44780_driver/struct.HD44780.html#method.set_cursor_pos
+const LINE2_POSITION: u8 = 40;
+
+#[arduino_uno::entry]
+fn main() -> ! {
+    let dp = arduino_uno::Peripherals::take().unwrap();
+    let mut pins = arduino_uno::Pins::new(dp.PORTB, dp.PORTC, dp.PORTD);
+
+    let mut delay = Delay::new();
+    let d2 = pins.d2.into_output(&mut pins.ddr);
+    let d3 = pins.d3.into_output(&mut pins.ddr);
+    let d4 = pins.d4.into_output(&mut pins.ddr);
+    let d5 = pins.d5.into_output(&mut pins.ddr);
+    let d11 = pins.d11.into_output(&mut pins.ddr); // enable
+    let d12 = pins.d12.into_output(&mut pins.ddr); // rs
+
+    let display_mode = DisplayMode {
+        cursor_visibility: Cursor::Invisible,
+        cursor_blink: CursorBlink::Off,
+        display: Display::On,
+    };
+    let mut lcd = HD44780::new_4bit(d12, d11, d5, d4, d3, d2, &mut delay).unwrap();
+
+    // Configure LCD
+    lcd.reset(&mut delay).unwrap();
+    lcd.clear(&mut delay).unwrap();
+    lcd.set_display_mode(display_mode, &mut delay).unwrap();
+
+    // Write first line
+    lcd.set_cursor_pos(0, &mut delay).unwrap();
+    lcd.write_str("Hello, rust!", &mut delay).unwrap();
+    let mut seconds: u16 = 0;
+
+    // Buffer for second line
+    let mut buffer = [0u8; 16];
+
+    loop {
+        // Write second line
+        lcd.set_cursor_pos(LINE2_POSITION, &mut delay).unwrap();
+        let line2_bytes = seconds.numtoa(10, &mut buffer);
+        lcd.write_bytes(line2_bytes, &mut delay).unwrap();
+
+        // Sleep
+        arduino_uno::delay_ms(1000);
+        seconds += 1;
+    }
+}

examples/arduino-uno/uno-runner.sh

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+#!/usr/bin/env sh
+set -e
+
+if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
+    echo "usage: $0 <application.elf>" >&2
+    exit 1
+fi
+
+if [ "$#" -lt 1 ]; then
+    echo "$0: no ELF file given" >&2
+    exit 1
+fi
+
+NAME="$(basename "$1")"
+SIZE_TEXT="$(avr-size "$1" | tail -1 | cut -f1)"
+SIZE_DATA="$(avr-size "$1" | tail -1 | cut -f2)"
+SIZE_BSS="$(avr-size "$1" | tail -1 | cut -f3)"
+
+printf "\n"
+printf "Program:             %s\n" "$NAME"
+printf "Size:\n"
+printf "   .text   %s (exact: %d)\n" "$(numfmt --to=si --padding=9 "$SIZE_TEXT")" "$SIZE_TEXT"
+printf "   .data   %s (exact: %d)\n" "$(numfmt --to=si --padding=9 "$SIZE_DATA")" "$SIZE_DATA"
+printf "   .bss    %s (exact: %d)\n" "$(numfmt --to=si --padding=9 "$SIZE_BSS")" "$SIZE_BSS"
+printf "\n"
+printf "Attempting to flash ...\n"
+printf "\n"
+
+avrdude -q -C/etc/avrdude.conf -patmega328p -carduino -P/dev/ttyACM0 -D "-Uflash:w:$1:e"