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raspberry_pi_inky_phat.rs
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raspberry_pi_inky_phat.rs
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extern crate linux_embedded_hal;
use linux_embedded_hal::spidev::{SpiModeFlags, SpidevOptions};
use linux_embedded_hal::sysfs_gpio::Direction;
use linux_embedded_hal::Delay;
use linux_embedded_hal::{Pin, Spidev};
extern crate ssd1675;
use ssd1675::{Builder, Color, Dimensions, Display, GraphicDisplay, Rotation};
// Graphics
#[macro_use]
extern crate embedded_graphics;
use embedded_graphics::mono_font::MonoTextStyle;
use embedded_graphics::prelude::*;
use embedded_graphics::text::Text;
// Font
extern crate profont;
use profont::{PROFONT_12_POINT, PROFONT_14_POINT, PROFONT_24_POINT, PROFONT_9_POINT};
use std::process::Command;
use std::thread::sleep;
use std::time::Duration;
use std::{fs, io};
// Activate SPI, GPIO in raspi-config needs to be run with sudo because of some sysfs_gpio
// permission problems and follow-up timing problems
// see https://github.com/rust-embedded/rust-sysfs-gpio/issues/5 and follow-up issues
const ROWS: u16 = 212;
const COLS: u8 = 104;
#[rustfmt::skip]
const LUT: [u8; 70] = [
// Phase 0 Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 Phase 6
// A B C D A B C D A B C D A B C D A B C D A B C D A B C D
0b01001000, 0b10100000, 0b00010000, 0b00010000, 0b00010011, 0b00000000, 0b00000000, // LUT0 - Black
0b01001000, 0b10100000, 0b10000000, 0b00000000, 0b00000011, 0b00000000, 0b00000000, // LUTT1 - White
0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, // IGNORE
0b01001000, 0b10100101, 0b00000000, 0b10111011, 0b00000000, 0b00000000, 0b00000000, // LUT3 - Red
0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, // LUT4 - VCOM
// Duration | Repeat
// A B C D |
64, 12, 32, 12, 6, // 0 Flash
16, 8, 4, 4, 6, // 1 clear
4, 8, 8, 16, 16, // 2 bring in the black
2, 2, 2, 64, 32, // 3 time for red
2, 2, 2, 2, 2, // 4 final black sharpen phase
0, 0, 0, 0, 0, // 5
0, 0, 0, 0, 0 // 6
];
fn main() -> Result<(), std::io::Error> {
// Configure SPI
let mut spi = Spidev::open("/dev/spidev0.0").expect("SPI device");
let options = SpidevOptions::new()
.bits_per_word(8)
.max_speed_hz(4_000_000)
.mode(SpiModeFlags::SPI_MODE_0)
.build();
spi.configure(&options).expect("SPI configuration");
// https://pinout.xyz/pinout/inky_phat
// Configure Digital I/O Pins
let cs = Pin::new(8); // BCM8
cs.export().expect("cs export");
while !cs.is_exported() {}
cs.set_direction(Direction::Out).expect("CS Direction");
cs.set_value(1).expect("CS Value set to 1");
let busy = Pin::new(17); // BCM17
busy.export().expect("busy export");
while !busy.is_exported() {}
busy.set_direction(Direction::In).expect("busy Direction");
let dc = Pin::new(22); // BCM22
dc.export().expect("dc export");
while !dc.is_exported() {}
dc.set_direction(Direction::Out).expect("dc Direction");
dc.set_value(1).expect("dc Value set to 1");
let reset = Pin::new(27); // BCM27
reset.export().expect("reset export");
while !reset.is_exported() {}
reset
.set_direction(Direction::Out)
.expect("reset Direction");
reset.set_value(1).expect("reset Value set to 1");
println!("Pins configured");
// Initialise display controller
let mut delay = Delay {};
let controller = ssd1675::Interface::new(spi, cs, busy, dc, reset);
let mut black_buffer = [0u8; ROWS as usize * COLS as usize / 8];
let mut red_buffer = [0u8; ROWS as usize * COLS as usize / 8];
let config = Builder::new()
.dimensions(Dimensions {
rows: ROWS,
cols: COLS,
})
.rotation(Rotation::Rotate270)
.lut(&LUT)
.build()
.expect("invalid configuration");
let display = Display::new(controller, config);
let mut display = GraphicDisplay::new(display, &mut black_buffer, &mut red_buffer);
// Main loop. Displays CPU temperature, uname, and uptime every minute with a red Raspberry Pi
// header.
loop {
display.reset(&mut delay).expect("error resetting display");
println!("Reset and initialised");
let one_minute = Duration::from_secs(60);
display.clear(Color::White);
println!("Clear");
Text::new(
"Raspberry Pi",
Point::new(1, -4),
MonoTextStyle::new(&PROFONT_24_POINT, Color::Red),
)
.draw(&mut display)
.expect("error drawing text");
if let Ok(cpu_temp) = read_cpu_temp() {
Text::new(
"CPU Temp:",
Point::new(1, 30),
MonoTextStyle::new(&PROFONT_14_POINT, Color::Black),
)
.draw(&mut display)
.expect("error drawing text");
Text::new(
&format!("{:.1}°C", cpu_temp),
Point::new(95, 34),
MonoTextStyle::new(&PROFONT_12_POINT, Color::Black),
)
.draw(&mut display)
.expect("error drawing text");
}
if let Some(uptime) = read_uptime() {
Text::new(
uptime.trim(),
Point::new(1, 93),
MonoTextStyle::new(&PROFONT_9_POINT, Color::Black),
)
.draw(&mut display)
.expect("error drawing text");
}
if let Some(uname) = read_uname() {
Text::new(
uname.trim(),
Point::new(1, 84),
MonoTextStyle::new(&PROFONT_9_POINT, Color::Black),
)
.draw(&mut display)
.expect("error drawing text");
}
display.update(&mut delay).expect("error updating display");
println!("Update...");
println!("Finished - going to sleep");
display.deep_sleep()?;
sleep(one_minute);
}
}
fn read_cpu_temp() -> Result<f64, io::Error> {
fs::read_to_string("/sys/class/thermal/thermal_zone0/temp")?
.trim()
.parse::<i32>()
.map(|temp| temp as f64 / 1000.)
.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
}
fn read_uptime() -> Option<String> {
Command::new("uptime")
.arg("-p")
.output()
.ok()
.and_then(|output| {
if output.status.success() {
String::from_utf8(output.stdout).ok()
} else {
None
}
})
}
fn read_uname() -> Option<String> {
Command::new("uname")
.arg("-smr")
.output()
.ok()
.and_then(|output| {
if output.status.success() {
String::from_utf8(output.stdout).ok()
} else {
None
}
})
}