Add drivers for gpio and piface

emgauwa-lib/Cargo.toml

@@ -26,3 +26,7 @@ libsqlite3-sys = { version = "*", features = ["bundled"] }
 uuid = "1.6"
 futures = "0.3"
 libc = "0.2"
+
+rppal = "0.17"
+rppal-pfd = "0.0.5"
+rppal-mcp23s17 = "0.0.3"

emgauwa-lib/src/drivers/gpio.rs

@@ -0,0 +1,35 @@
+use rppal::gpio::{Gpio, OutputPin};
+
+use crate::drivers::RelayDriver;
+use crate::errors::EmgauwaError;
+
+pub struct GpioDriver {
+	pub gpio: OutputPin,
+	pub inverted: bool,
+}
+
+impl GpioDriver {
+	pub fn new(pin: u8, inverted: bool) -> Result<Self, EmgauwaError> {
+		let gpio = Gpio::new()?.get(pin)?.into_output();
+		Ok(Self { gpio, inverted })
+	}
+}
+
+impl RelayDriver for GpioDriver {
+	fn set(&mut self, value: bool) -> Result<(), EmgauwaError> {
+		if self.get_high(value) {
+			self.gpio.set_high();
+		} else {
+			self.gpio.set_low();
+		}
+		Ok(())
+	}
+
+	fn get_pin(&self) -> u8 {
+		self.gpio.pin()
+	}
+
+	fn get_inverted(&self) -> bool {
+		self.inverted
+	}
+}

emgauwa-lib/src/drivers/mod.rs

@@ -0,0 +1,17 @@
+mod gpio;
+mod piface;
+
+pub use gpio::GpioDriver;
+pub use piface::PifaceDriver;
+
+use crate::errors::EmgauwaError;
+
+pub trait RelayDriver {
+	fn get_high(&self, value: bool) -> bool {
+		value ^ self.get_inverted()
+	}
+
+	fn set(&mut self, value: bool) -> Result<(), EmgauwaError>;
+	fn get_pin(&self) -> u8;
+	fn get_inverted(&self) -> bool;
+}

emgauwa-lib/src/drivers/piface.rs

@@ -0,0 +1,52 @@
+use rppal_pfd::{
+	ChipSelect, HardwareAddress, OutputPin, PiFaceDigital, PiFaceDigitalError, SpiBus, SpiMode,
+};
+
+use crate::drivers::RelayDriver;
+use crate::errors::EmgauwaError;
+
+pub struct PifaceDriver {
+	pub pfd_pin: OutputPin,
+}
+
+impl PifaceDriver {
+	pub fn new(pin: u8, pfd: &Option<PiFaceDigital>) -> Result<Self, EmgauwaError> {
+		let pfd = pfd.as_ref().ok_or(EmgauwaError::Hardware(String::from(
+			"PiFaceDigital not initialized",
+		)))?;
+		let pfd_pin = pfd.get_output_pin(pin)?;
+		Ok(Self { pfd_pin })
+	}
+
+	pub fn init_piface() -> Result<PiFaceDigital, EmgauwaError> {
+		let mut pfd = PiFaceDigital::new(
+			HardwareAddress::new(0)?,
+			SpiBus::Spi0,
+			ChipSelect::Cs0,
+			100_000,
+			SpiMode::Mode0,
+		)?;
+		pfd.init()?;
+
+		Ok(pfd)
+	}
+}
+
+impl RelayDriver for PifaceDriver {
+	fn set(&mut self, value: bool) -> Result<(), EmgauwaError> {
+		if self.get_high(value) {
+			self.pfd_pin.set_high().map_err(PiFaceDigitalError::from)?;
+		} else {
+			self.pfd_pin.set_low().map_err(PiFaceDigitalError::from)?;
+		}
+		Ok(())
+	}
+
+	fn get_pin(&self) -> u8 {
+		self.pfd_pin.get_pin_number()
+	}
+
+	fn get_inverted(&self) -> bool {
+		false
+	}
+}

emgauwa-lib/src/errors/emgauwa_error.rs

@@ -6,6 +6,9 @@ use actix::MailboxError;
 use actix_web::http::StatusCode;
 use actix_web::HttpResponse;
 use config::ConfigError;
+use rppal::gpio;
+use rppal_mcp23s17::Mcp23s17Error;
+use rppal_pfd::PiFaceDigitalError;
 use serde::ser::SerializeStruct;
 use serde::{Serialize, Serializer};
 
@@ -21,6 +24,7 @@ pub enum EmgauwaError {
 	Other(String),
 	Internal(String),
 	Connection(ControllerUid),
+	Hardware(String),
 }
 
 impl EmgauwaError {
@@ -33,6 +37,7 @@ impl EmgauwaError {
 			EmgauwaError::Internal(_) => StatusCode::INTERNAL_SERVER_ERROR,
 			EmgauwaError::Connection(_) => StatusCode::GATEWAY_TIMEOUT,
 			EmgauwaError::Other(_) => StatusCode::INTERNAL_SERVER_ERROR,
+			EmgauwaError::Hardware(_) => StatusCode::INTERNAL_SERVER_ERROR,
 		}
 	}
 }
@@ -47,6 +52,7 @@ impl From<&EmgauwaError> for String {
 			EmgauwaError::Internal(_) => String::from("internal error"),
 			EmgauwaError::Connection(_) => String::from("the target controller is not connected"),
 			EmgauwaError::Other(err) => format!("other error: {}", err),
+			EmgauwaError::Hardware(err) => format!("hardware error: {}", err),
 		}
 	}
 }
@@ -93,6 +99,25 @@ impl From<ConfigError> for EmgauwaError {
 	}
 }
 
+impl From<gpio::Error> for EmgauwaError {
+	fn from(value: gpio::Error) -> Self {
+		Self::Hardware(value.to_string())
+	}
+}
+
+impl From<PiFaceDigitalError> for EmgauwaError {
+	fn from(value: PiFaceDigitalError) -> Self {
+		match value {
+			PiFaceDigitalError::Mcp23s17Error { source } => match source {
+				Mcp23s17Error::SpiError { source } => Self::Hardware(source.to_string()),
+				_ => Self::Hardware(source.to_string()),
+			},
+			PiFaceDigitalError::GpioError { source } => Self::Hardware(source.to_string()),
+			_ => Self::Hardware(value.to_string()),
+		}
+	}
+}
+
 impl From<&EmgauwaError> for HttpResponse {
 	fn from(err: &EmgauwaError) -> Self {
 		HttpResponse::build(err.get_code()).json(err)

emgauwa-lib/src/lib.rs

@@ -1,5 +1,6 @@
 pub mod constants;
 pub mod db;
+pub mod drivers;
 pub mod errors;
 pub mod models;
 pub mod settings;