added parallel gpio interface

src/gpio.rs

@@ -0,0 +1,122 @@
+use crate::{Error, Interface};
+use embedded_hal::digital::v2::OutputPin;
+
+/// `Interface` implementation for GPIO interfaces
+pub struct Gpio8Interface<'a, DATA, CSX, WRX, RDX, DCX> {
+	data_pins: &'a mut [DATA; 8],
+	csx: CSX,
+	wrx: WRX,
+	rdx: RDX,
+	dcx: DCX,
+}
+
+impl<'a, CSX, WRX, RDX, DCX, PinE>
+	Gpio8Interface<'_, &'a mut dyn OutputPin<Error = PinE>, CSX, WRX, RDX, DCX>
+where
+	CSX: OutputPin<Error = PinE>,
+	WRX: OutputPin<Error = PinE>,
+	RDX: OutputPin<Error = PinE>,
+	DCX: OutputPin<Error = PinE>,
+{
+	/// Create a new Gpio8Interface
+	///
+	/// Example useage:
+	///
+	/// let csx = gpioc.pc2.into_push_pull_output();
+	/// let wrx = gpiod.pd13.into_push_pull_output();
+	/// let rdx = gpiod.pd12.into_push_pull_output();
+	/// let dcx = gpiof.pf7.into_push_pull_output();
+	///
+	/// let mut data_pins: [&mut dyn OutputPin<Error = _>; 8] = [
+	/// 	&mut gpiod.pd6.into_push_pull_output(),
+	/// 	&mut gpiog.pg11.into_push_pull_output(),
+	/// 	...
+	/// ];
+	///
+	/// let if_gpio = ili9341::gpio::Gpio8Interface::new(&mut data_pins, csx, wrx, rdx, dcx);
+	pub fn new(
+		data_pins: &'a mut [&'a mut dyn OutputPin<Error = PinE>; 8],
+		csx: CSX,
+		wrx: WRX,
+		rdx: RDX,
+		dcx: DCX,
+	) -> Self {
+		Self {
+			data_pins,
+			csx,
+			wrx,
+			rdx,
+			dcx,
+		}
+	}
+
+	/// Sets the gpio data pins used in the parallel interface
+	fn set_data_bus(&mut self, data: u8) -> Result<(), Error<PinE, PinE>> {
+		for (i, d) in self.data_pins.iter_mut().enumerate() {
+			if ((data >> i) & 0b1) == 0b1 {
+				d.set_high().map_err(Error::OutputPin)?;
+			} else {
+				d.set_low().map_err(Error::OutputPin)?;
+			}
+		}
+		Ok(())
+	}
+}
+
+impl<'a, CSX, WRX, RDX, DCX, PinE> Interface
+	for Gpio8Interface<'_, &mut dyn OutputPin<Error = PinE>, CSX, WRX, RDX, DCX>
+where
+	CSX: OutputPin<Error = PinE>,
+	WRX: OutputPin<Error = PinE>,
+	RDX: OutputPin<Error = PinE>,
+	DCX: OutputPin<Error = PinE>,
+{
+	type Error = Error<PinE, PinE>;
+
+	fn write(&mut self, command: u8, data: &[u8]) -> Result<(), Self::Error> {
+		self.csx.set_low().map_err(Error::OutputPin)?;
+		self.rdx.set_high().map_err(Error::OutputPin)?;
+		self.dcx.set_low().map_err(Error::OutputPin)?;
+		self.wrx.set_low().map_err(Error::OutputPin)?;
+
+		self.set_data_bus(command)?;
+		self.wrx.set_high().map_err(Error::OutputPin)?;
+
+		self.dcx.set_high().map_err(Error::OutputPin)?;
+		for val in data.iter() {
+			self.wrx.set_low().map_err(Error::OutputPin)?;
+			self.set_data_bus(*val)?;
+			self.wrx.set_high().map_err(Error::OutputPin)?;
+		}
+
+		self.csx.set_high().map_err(Error::OutputPin)?;
+
+		Ok(())
+	}
+
+	fn write_iter(
+		&mut self,
+		command: u8,
+		data: impl IntoIterator<Item = u16>,
+	) -> Result<(), Self::Error> {
+		self.csx.set_low().map_err(Error::OutputPin)?;
+		self.rdx.set_high().map_err(Error::OutputPin)?;
+		self.dcx.set_low().map_err(Error::OutputPin)?;
+		self.wrx.set_low().map_err(Error::OutputPin)?;
+
+		self.set_data_bus(command)?;
+		self.wrx.set_high().map_err(Error::OutputPin)?;
+
+		self.dcx.set_high().map_err(Error::OutputPin)?;
+		for val in data.into_iter() {
+			for b in &val.to_be_bytes() {
+				self.wrx.set_low().map_err(Error::OutputPin)?;
+				self.set_data_bus(*b)?;
+				self.wrx.set_high().map_err(Error::OutputPin)?;
+			}
+		}
+
+		self.csx.set_high().map_err(Error::OutputPin)?;
+		Ok(())
+	}
+}