Add a nix expression for easier development

Cargo.toml

@@ -11,7 +11,6 @@ embedded-graphics = "0.7.1"
 linux-embedded-hal = "0.3.0"
 embedded-hal = "0.2.5"
 libc = "0.2.98"
-gpio-cdev = "0.4"
 rusqlite = "0.27.0"
 time = { version = "0.3.9", features = ["parsing"] }
 time-tz = "1.0.1"
@@ -23,8 +22,16 @@ rppal = { version = "0.13.1", features = ["hal"] }
 ssd1351 = { git = "https://github.com/FliegendeWurst/ssd1351-rust" }
 display-interface-spi = "0.4.1"
 ureq = { version = "2.4.0", default-features = false }
+winit = { version = "0.28.7", optional = true }
+softbuffer = { version = "0.3.1", optional = true }
+rand_xoshiro = "0.6.0"
+gpiocdev = "0.6.0"
 #gpio-am2302-rs = { git = "https://github.com/FliegendeWurst/gpio-am2302-rs" }
 
+[features]
+pc = ["winit", "softbuffer"]
+default = [ "pc" ]
+
 [profile.release]
 codegen-units = 1
 debug = true

LICENSE

@@ -1,19 +1,674 @@
-Copyright (c) 2022 Arne Keller
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+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -13,11 +13,26 @@ The used OLED display is from [Waveshare](https://www.waveshare.com/wiki/1.5inch
 > scp target/arm-unknown-linux-musleabihf/release/{display_all,display_off,refresh_json,take_measurement,status_check_example} 'pi@raspberrypi:~'
 > # on the Pi, create sensors.db and events.json
 > ./status_check_example > /run/user/1000/status.json
-> patchelf --set-interpreter /lib/ld-linux-armhf.so.3 display_all
+> patchelf --set-interpreter /lib/ld-musl-armhf.so.1 display_all
 > ./display_off on
 > ./display_all sensors.db events.json temps
 ```
 
+### Cross compile from NixOS x86_64
+
+```bash
+> nix-build --arg crossSystem '(import <nixpkgs/lib>).systems.examples.muslpi' -E 'with import <nixpkgs> {}; pkgsCross.muslpi.callPackage ./. { }'
+> mkdir /tmp/nixstore
+> nix copy --extra-experimental-features nix-command --extra-experimental-features flakes --no-check-sigs --to /tmp/nixstore $(readlink -f result)
+> rsync -r --links --info=progress --compress /tmp/nixstore/nix pi@himbeere-null:~/
+```
+
+On the Pi:
+```bash
+> sudo mv nix /
+> sudo patchelf --set-interpreter /lib/ld-musl-armhf.so.1 /nix/store/*-raspi-oled-*-infdev-*/bin/*
+```
+
 ## Example
 
 ![temperature graph](./images/temps.png)
@@ -25,3 +40,16 @@ The used OLED display is from [Waveshare](https://www.waveshare.com/wiki/1.5inch
 ![events](./images/events.png)
 
 (the blue text seen in the second image is bright enough on the real OLED display)
+
+## License
+
+Copyright 🄯 2022-2023 FliegendeWurst
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+See [`LICENSE`]. Applies to all files except the ones listed below.
+
+`src/rpi.raw` is the Raspberry Pi logo. Raspberry Pi is a trademark of Raspberry Pi Ltd.

default.nix

@@ -0,0 +1,32 @@
+{ lib, fetchFromGitHub, rustPlatform, pkg-config, sqlite }:
+
+rustPlatform.buildRustPackage {
+  pname = "raspi-oled";
+  version = "unstable-infdev-4";
+
+  src = ./.;
+
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+    outputHashes = {
+      "ssd1351-0.3.0" = "sha256-K6QCU9qPEuU7Ur8W6fTdi4JWk8NsVz3mLfV0afpfdBA=";
+	  # "gpio-am2302-rs-1.1.0" = "sha256-tyA/R80LtWIXoVEoxHhkmzy0IsMdMH1Oi3FTQ56XjyQ=";
+    };
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+
+  cargoBuildFlags = [ "--no-default-features" ];
+
+  buildInputs = [ sqlite ];
+
+  RUSTC_BOOTSTRAP = "1";
+
+  meta = with lib; {
+    description = "OLED display of clock/calendar/temperature";
+    homepage = "https://github.com/FliegendeWurst/raspi-oled";
+    license = licenses.mit;
+    maintainers = with maintainers; [ fliegendewurst ];
+  };
+}
+

src/bin/main_loop.rs

@@ -0,0 +1,320 @@
+use std::{
+	thread::sleep_ms,
+	time::{Duration, Instant},
+};
+
+use display_interface_spi::SPIInterfaceNoCS;
+use embedded_graphics::{
+	mono_font::{ascii::FONT_10X20, MonoTextStyleBuilder},
+	pixelcolor::Rgb565,
+	prelude::{DrawTarget, Point, Size},
+	text::Text,
+	Drawable,
+};
+use gpiocdev::line::{Bias, EdgeDetection, Value};
+use raspi_oled::FrameOutput;
+use rppal::{
+	gpio::{Gpio, OutputPin},
+	hal::Delay,
+	spi::{Bus, Mode, SlaveSelect, Spi},
+};
+use ssd1351::display::display::Ssd1351;
+use time::OffsetDateTime;
+use time_tz::{timezones::db::europe::BERLIN, OffsetDateTimeExt};
+
+static STAR: &'static [u8] = include_bytes!("../star.raw");
+static RPI: &'static [u8] = include_bytes!("../rpi.raw");
+
+static BLACK: Rgb565 = Rgb565::new(0, 0, 0);
+static TIME_COLOR: Rgb565 = Rgb565::new(0b01_111, 0b011_111, 0b01_111);
+
+fn main() {
+	if rppal::system::DeviceInfo::new().is_ok() {
+		rpi_main();
+	} else {
+		pc_main();
+	}
+}
+
+#[cfg(not(feature = "pc"))]
+fn pc_main() {}
+
+#[cfg(feature = "pc")]
+fn pc_main() {
+	use std::num::NonZeroU32;
+
+	use embedded_graphics::primitives::{PrimitiveStyleBuilder, Rectangle, StyledDrawable};
+	use rand_xoshiro::{
+		rand_core::{RngCore, SeedableRng},
+		Xoroshiro128StarStar,
+	};
+	use winit::{
+		dpi::LogicalSize,
+		event::{Event, WindowEvent},
+		event_loop::EventLoop,
+		window::WindowBuilder,
+	};
+
+	let event_loop = EventLoop::new();
+	let window = WindowBuilder::new()
+		.with_inner_size(LogicalSize::new(128, 128))
+		.build(&event_loop)
+		.unwrap();
+	let context = unsafe { softbuffer::Context::new(&window) }.unwrap();
+	let mut surface = unsafe { softbuffer::Surface::new(&context, &window) }.unwrap();
+
+	let start = Instant::now();
+	let mut iters = 0;
+	let mut disp = FrameOutput::new(128, 128);
+	//disp.buffer.save("/tmp/x.png").unwrap();
+	let mut rng = Xoroshiro128StarStar::seed_from_u64(0);
+	let mut buffer_dirty = true;
+
+	event_loop.run(move |event, _, control_flow| {
+		// ControlFlow::Poll continuously runs the event loop, even if the OS hasn't
+		// dispatched any events. This is ideal for games and similar applications.
+		control_flow.set_poll();
+
+		match event {
+			Event::WindowEvent {
+				event: WindowEvent::CloseRequested,
+				..
+			} => {
+				println!("The close button was pressed; stopping");
+				control_flow.set_exit();
+			},
+			Event::MainEventsCleared => {
+				// Application update code.
+
+				// Queue a RedrawRequested event.
+				//
+				// You only need to call this if you've determined that you need to redraw, in
+				// applications which do not always need to. Applications that redraw continuously
+				// can just render here instead.
+				window.request_redraw();
+			},
+			Event::RedrawRequested(window_id) if window_id == window.id() => {
+				// Redraw the application.
+				//
+				// It's preferable for applications that do not render continuously to render in
+				// this event rather than in MainEventsCleared, since rendering in here allows
+				// the program to gracefully handle redraws requested by the OS.
+				let (width, height) = {
+					let size = window.inner_size();
+					(size.width, size.height)
+				};
+				surface
+					.resize(NonZeroU32::new(width).unwrap(), NonZeroU32::new(height).unwrap())
+					.unwrap();
+
+				// redraw
+				if Instant::now().duration_since(start) > Duration::from_millis(iters * 50) {
+					iters += 1;
+					//loop_iter(&mut disp).unwrap();
+					/*
+					let mut time = OffsetDateTime::now_utc().to_timezone(BERLIN);
+					//time += Duration::new(iters * 60, 0);
+					disp.clear(Rgb565::new(0, 0, 0)).unwrap();
+					display_clock(&mut disp, &time).unwrap();
+					*/
+					/*
+					let iters = iters % 300;
+					let (s, c) = (iters as f32 * 0.1).sin_cos();
+					let (mut x, mut y) = (s * iters as f32 * 0.005, c * iters as f32 * 0.005);
+					x *= 64.;
+					y *= 64.;
+					x += 64.;
+					y += 64.;
+					let variation = iters as u32 / 16 + 1;
+					for _ in 0..16 {
+						let dx = (rng.next_u32() % variation) as i32 - variation as i32 / 2;
+						let dy = (rng.next_u32() % variation) as i32 - variation as i32 / 2;
+						let color = rng.next_u32();
+						let p = Rectangle::new(Point::new(x as i32 + dx, y as i32 + dy), Size::new(1, 1));
+						let s = PrimitiveStyleBuilder::new()
+							.fill_color(Rgb565::new(
+								color as u8 & 0b11111,
+								((color >> 8) & 0b111111) as u8,
+								((color >> 16) & 0b111111) as u8,
+							))
+							.build();
+						p.draw_styled(&s, &mut disp).unwrap();
+					}
+					if iters % 300 == 0 {
+						disp.clear(Rgb565::new(0, 0, 0)).unwrap();
+					}
+					*/
+					for _ in 0..16 {
+						let x = (rng.next_u32() % 128) as usize;
+						let y = (rng.next_u32() % 128) as usize;
+						let dx = (rng.next_u32() % 8) as i32 - 4;
+						let dy = (rng.next_u32() % 8) as i32 - 4;
+						let red = STAR[y * 128 * 3 + x * 3];
+						let green = STAR[y * 128 * 3 + x * 3 + 1];
+						if red == 0xff {
+							let color = rng.next_u32();
+							let r;
+							let g;
+							let b;
+							// star
+							r = (color as u8 & 0b11111).saturating_mul(2);
+							g = (((color >> 8) & 0b111111) as u8).saturating_mul(2);
+							b = ((color >> 16) & 0b111111) as u8 / 3;
+							// rpi
+							/*
+							if red > green {
+								r = (color as u8 & 0b11111).saturating_mul(2);
+								g = ((color >> 8) & 0b111111) as u8 / 3;
+								b = ((color >> 16) & 0b111111) as u8 / 3;
+							} else {
+								r = (color as u8 & 0b11111) / 2;
+								g = (((color >> 8) & 0b111111) as u8).saturating_mul(2);
+								b = ((color >> 16) & 0b111111) as u8 / 3;
+							}
+							*/
+							let p = Rectangle::new(Point::new(x as i32 + dx, y as i32 + dy), Size::new(1, 1));
+							let s = PrimitiveStyleBuilder::new()
+								.fill_color(Rgb565::new(r as u8, g as u8, b as u8))
+								.build();
+							p.draw_styled(&s, &mut disp).unwrap();
+						}
+					}
+					buffer_dirty = true;
+				}
+
+				let mut buffer = surface.buffer_mut().unwrap();
+				if buffer_dirty {
+					for index in 0..(width * height) {
+						let y = index / width;
+						let x = index % width;
+						let pixel = disp.buffer.get_pixel(x, y);
+						let red = pixel.0[0] << 0;
+						let green = pixel.0[1] << 0;
+						let blue = pixel.0[2] << 0;
+
+						buffer[index as usize] = blue as u32 | ((green as u32) << 8) | ((red as u32) << 16);
+					}
+					buffer.present().unwrap();
+					buffer_dirty = false;
+				}
+			},
+			_ => (),
+		}
+	});
+}
+
+fn rpi_main() {
+	let spi = Spi::new(Bus::Spi0, SlaveSelect::Ss0, 19660800, Mode::Mode0).unwrap();
+	let gpio = Gpio::new().unwrap();
+	let dc = gpio.get(25).unwrap().into_output();
+	let mut rst = gpio.get(27).unwrap().into_output();
+
+	// Init SPI
+	let spii = SPIInterfaceNoCS::new(spi, dc);
+	let mut disp = Ssd1351::new(spii);
+
+	// Reset & init
+	disp.reset(&mut rst, &mut Delay).unwrap();
+	disp.turn_on().unwrap();
+
+	main_loop(disp);
+}
+
+fn main_loop(mut disp: Ssd1351<SPIInterfaceNoCS<Spi, OutputPin>>) {
+	disp.clear(BLACK).unwrap();
+	let mut last_min = 0xff;
+	let mut last_button = Instant::now();
+
+	let mut menu = vec![];
+	let _high_outputs = gpiocdev::Request::builder()
+		.on_chip("/dev/gpiochip0")
+		.with_lines(&[23, 24])
+		.as_output(Value::Active)
+		.request()
+		.unwrap();
+	let lines = gpiocdev::Request::builder()
+		.on_chip("/dev/gpiochip0")
+		.with_line(19)
+		.with_edge_detection(EdgeDetection::RisingEdge)
+		.with_debounce_period(Duration::from_millis(5))
+		.with_bias(Bias::PullDown)
+		.with_line(6)
+		.with_edge_detection(EdgeDetection::RisingEdge)
+		.with_debounce_period(Duration::from_millis(5))
+		.with_bias(Bias::PullDown)
+		.with_line(5)
+		.with_edge_detection(EdgeDetection::RisingEdge)
+		.with_debounce_period(Duration::from_millis(5))
+		.with_bias(Bias::PullDown)
+		.request()
+		.unwrap();
+
+	loop {
+		// respond to button presses
+		while lines.wait_edge_event(Duration::from_millis(1)).unwrap() {
+			let e = lines.read_edge_event().unwrap();
+			last_button = Instant::now();
+			match e.offset {
+				19 => {
+					menu.push(1);
+				},
+				6 => {
+					menu.push(2);
+				},
+				5 => {
+					menu.push(3);
+				},
+				_ => {
+					println!("unknown offset: {}", e.offset);
+				},
+			}
+			println!("menu: {menu:?}");
+		}
+		// clean up stale menu selection
+		if !menu.is_empty() && Instant::now().duration_since(last_button).as_secs() >= 10 {
+			menu.clear();
+		}
+		let time = OffsetDateTime::now_utc().to_timezone(BERLIN);
+		if time.minute() == last_min {
+			sleep_ms(1000);
+			continue;
+		}
+		last_min = time.minute();
+		if let Err(e) = loop_iter(&mut disp) {
+			println!("error: {:?}", e);
+		}
+		let _ = disp.flush(); // ignore bus write errors, they are harmless
+	}
+}
+
+fn loop_iter<D: DrawTarget<Color = Rgb565>>(disp: &mut D) -> Result<(), D::Error> {
+	disp.clear(Rgb565::new(0, 0, 0))?;
+	let time = OffsetDateTime::now_utc().to_timezone(BERLIN);
+	display_clock(disp, &time)
+}
+
+fn display_clock<D: DrawTarget<Color = Rgb565>>(disp: &mut D, time: &OffsetDateTime) -> Result<(), D::Error> {
+	let text_style_clock = MonoTextStyleBuilder::new()
+		.font(&FONT_10X20)
+		.text_color(TIME_COLOR)
+		.build();
+	let hour = time.hour();
+	let minute = time.minute();
+	let unix_minutes = minute as i32 * 5 / 3; // (time.unix_timestamp() / 60) as i32;
+	let dx = ((hour % 3) as i32 - 1) * 40 - 2;
+	let hour = format!("{:02}", hour);
+	Text::new(
+		&hour,
+		Point::new(64 - 20 + dx, 20 + unix_minutes % 100),
+		text_style_clock,
+	)
+	.draw(disp)?;
+	let minute = format!("{:02}", minute);
+	Text::new(
+		&minute,
+		Point::new(64 + 4 + dx, 20 + unix_minutes % 100),
+		text_style_clock,
+	)
+	.draw(disp)?;
+	Ok(())
+}

src/bin/rgb_test.rs

@@ -17,7 +17,6 @@ use embedded_graphics::{
 	Drawable,
 };
 use embedded_hal::digital::v2::OutputPin;
-use gpio_cdev::{Chip, LineHandle, LineRequestFlags};
 use image::{ImageBuffer, Rgb};
 use linux_embedded_hal::I2cdev;
 use rppal::{
@@ -86,17 +85,3 @@ fn main() {
 	disp.reset(&mut rst, &mut Delay).unwrap();
 	disp.turn_off().unwrap();
 }
-
-struct LineHandleWrapper(LineHandle);
-
-impl OutputPin for LineHandleWrapper {
-	type Error = gpio_cdev::Error;
-
-	fn set_low(&mut self) -> Result<(), Self::Error> {
-		self.0.set_value(0)
-	}
-
-	fn set_high(&mut self) -> Result<(), Self::Error> {
-		self.0.set_value(1)
-	}
-}

src/bin/take_measurement.rs

@@ -1,6 +1,5 @@
 use std::time::{Duration, SystemTime};
 
-use gpio_cdev::Chip;
 use rusqlite::{params, Connection};
 
 fn main() {
@@ -21,8 +20,6 @@ fn main() {
 		)
 		.unwrap();
 
-	let mut chip = Chip::new("/dev/gpiochip0").unwrap();
-	let line = chip.get_line(26).unwrap();
 	let mut attempts = 0;
 	let mut temps = vec![];
 	let mut rhs = vec![];
@@ -30,7 +27,7 @@ fn main() {
 		.duration_since(SystemTime::UNIX_EPOCH)
 		.unwrap();
 	while temps.len() < 5 && attempts < 10 {
-		if let Ok((rh, temp)) = raspi_oled::am2302_reading(&line) {
+		if let Ok((rh, temp)) = raspi_oled::am2302_reading() {
 			// TODO: try out gpio_am2302_rs!
 			//if let Ok(reading) = gpio_am2302_rs::try_read(26) {
 			//let rh = reading.humidity as i64;
@@ -49,7 +46,14 @@ fn main() {
 		rhs.sort();
 		let rh = rhs[rhs.len() / 2];
 		let temp = temps[temps.len() / 2];
-		println!("info: acquired {} readings (temps {:?}, rhs {:?}), using rh {} and temp {}", temps.len(), temps, rhs, rh, temp);
+		println!(
+			"info: acquired {} readings (temps {:?}, rhs {:?}), using rh {} and temp {}",
+			temps.len(),
+			temps,
+			rhs,
+			rh,
+			temp
+		);
 		database
 			.execute(
 				"INSERT INTO sensor_readings (time, humidity, celsius) VALUES (?1, ?2, ?3)",

src/lib.rs

@@ -8,7 +8,7 @@ use embedded_graphics::{
 	pixelcolor::Rgb565,
 	prelude::{OriginDimensions, RgbColor, Size},
 };
-use gpio_cdev::{EventType, Line, LineRequestFlags};
+use gpiocdev::line::{Bias, EdgeDetection, EdgeKind, Value};
 use image::{ImageBuffer, Rgb};
 
 pub struct FrameOutput {
@@ -55,24 +55,22 @@ impl OriginDimensions for FrameOutput {
 	}
 }
 
-fn read_events(line: &gpio_cdev::Line, timeout: std::time::Duration) -> Result<Vec<(u64, EventType)>, SensorError> {
-	let input = line.request(LineRequestFlags::INPUT, 0, "read-data")?;
+fn read_events(timeout: std::time::Duration) -> Result<Vec<(u64, EdgeKind)>, SensorError> {
+	let input = gpiocdev::Request::builder()
+		.on_chip("/dev/gpiochip0")
+		.with_line(26)
+		.as_input()
+		.with_edge_detection(EdgeDetection::BothEdges)
+		.with_bias(Bias::PullDown)
+		.request()?;
 
-	let mut last_state = 1;
 	let start = time::Instant::now();
 
 	let mut events = Vec::with_capacity(81);
 	while start.elapsed() < timeout && events.len() < 81 {
-		let new_state = input.get_value()?;
-		if new_state != last_state {
-			let timestamp = start.elapsed();
-			let event_type = if last_state < new_state {
-				EventType::RisingEdge
-			} else {
-				EventType::FallingEdge
-			};
-			events.push((timestamp.as_micros() as u64, event_type));
-			last_state = new_state;
+		if input.wait_edge_event(timeout)? {
+			let event = input.read_edge_event()?;
+			events.push((start.elapsed().as_micros() as u64, event.kind));
 		}
 	}
 	if events.len() < 81 {
@@ -82,15 +80,15 @@ fn read_events(line: &gpio_cdev::Line, timeout: std::time::Duration) -> Result<V
 	Ok(events)
 }
 
-fn events_to_data(events: Vec<(u64, EventType)>) -> Vec<u8> {
+fn events_to_data(events: Vec<(u64, EdgeKind)>) -> Vec<u8> {
 	events[1..]
 		.windows(2)
 		.map(|pair| {
 			let prev = pair.get(0).unwrap();
 			let next = pair.get(1).unwrap();
 			match next.1 {
-				EventType::FallingEdge => Some(next.0 - prev.0),
-				EventType::RisingEdge => None,
+				EdgeKind::Falling => Some(next.0 - prev.0),
+				EdgeKind::Rising => None,
 			}
 		})
 		.filter(|&d| d.is_some())
@@ -150,29 +148,33 @@ fn test_process_data() {
 
 #[derive(Debug)]
 pub enum SensorError {
-	Io(gpio_cdev::Error),
+	Io(gpiocdev::Error),
 	ChecksumMismatch,
 	HumidityTooHigh,
 	Timeout,
 }
 
-impl From<gpio_cdev::Error> for SensorError {
-	fn from(error: gpio_cdev::Error) -> Self {
+impl From<gpiocdev::Error> for SensorError {
+	fn from(error: gpiocdev::Error) -> Self {
 		SensorError::Io(error)
 	}
 }
 
-pub fn am2302_reading(line: &Line) -> Result<(u16, u16), SensorError> {
-	let out = line.request(LineRequestFlags::OUTPUT, 1, "rust-am2302").unwrap();
-	out.set_value(1)?;
+pub fn am2302_reading() -> Result<(u16, u16), SensorError> {
+	let out = gpiocdev::Request::builder()
+		.on_chip("/dev/gpiochip0")
+		.with_line(26)
+		.as_output(Value::Active)
+		.request()?;
+	out.set_value(26, Value::Active)?;
 	sleep(Duration::from_millis(500));
 	set_max_priority();
 	// set low for 20 ms
-	out.set_value(0)?;
+	out.set_value(26, Value::Inactive)?;
 	sleep(Duration::from_millis(3));
 	drop(out);
 
-	let events = read_events(&line, Duration::from_secs(1));
+	let events = read_events(Duration::from_secs(1));
 	println!("{:?} {:?}", events, events.as_ref().map(|x| x.len()));
 	set_normal_priority();
 	let events = events?;