Add builder for constructing display

README.md

@@ -12,8 +12,8 @@ controller, for use with [embedded-hal].
 ## Description
 
 This driver is intended to work on embedded platforms using the `embedded-hal`
-trait library. It is `no_std` compatible, only uses safe Rust, and does not
-require an allocator. It supports the 4-wire SPI interface.
+trait library. It is `no_std` compatible, builds on stable Rust, and only uses
+safe Rust. It supports the 4-wire SPI interface.
 
 ## Tested Devices
 

src/command.rs

@@ -50,6 +50,7 @@ pub enum DeepSleepMode {
     DiscardRAM,
 }
 
+#[derive(Clone, Copy)]
 pub enum Command {
     /// Set the MUX of gate lines, scanning sequence and direction
     /// 0: MAX gate lines
@@ -207,11 +208,11 @@ macro_rules! pack {
 }
 
 impl Command {
-    pub(crate) fn execute<I: DisplayInterface>(self, interface: &mut I) -> Result<(), I::Error> {
+    pub(crate) fn execute<I: DisplayInterface>(&self, interface: &mut I) -> Result<(), I::Error> {
         use self::Command::*;
 
         let mut buf = [0u8; 4];
-        let (command, data) = match self {
+        let (command, data) = match *self {
             DriverOutputControl(gate_lines, scanning_seq_and_dir) => {
                 let [upper, lower] = u16_as_u8(gate_lines);
                 pack!(buf, 0x01, [lower, upper, scanning_seq_and_dir])
@@ -326,7 +327,7 @@ impl Command {
 }
 
 impl<'buf> BufCommand<'buf> {
-    pub(crate) fn execute<I: DisplayInterface>(self, interface: &mut I) -> Result<(), I::Error> {
+    pub(crate) fn execute<I: DisplayInterface>(&self, interface: &mut I) -> Result<(), I::Error> {
         use self::BufCommand::*;
 
         let (command, data) = match self {

src/config.rs

@@ -0,0 +1,105 @@
+use command::{BufCommand, Command, DataEntryMode, IncrementAxis};
+use display::{Dimensions, Rotation};
+
+pub struct Builder<'a> {
+    dummy_line_period: Command,
+    gate_line_width: Command,
+    write_vcom: Command,
+    write_lut: Option<BufCommand<'a>>,
+    data_entry_mode: Command,
+    dimensions: Option<Dimensions>,
+    rotation: Rotation
+}
+
+pub struct BuilderError {}
+
+pub struct Config<'a> {
+    pub(crate) dummy_line_period: Command,
+    pub(crate) gate_line_width: Command,
+    pub(crate) write_vcom: Command,
+    pub(crate) write_lut: Option<BufCommand<'a>>,
+    pub(crate) data_entry_mode: Command,
+    pub(crate) dimensions: Dimensions,
+    pub(crate) rotation: Rotation
+}
+
+impl<'a> Default for Builder<'a> {
+    fn default() -> Self {
+        Builder {
+            dummy_line_period: Command::DummyLinePeriod(0x07),
+            gate_line_width: Command::GateLineWidth(0x04),
+            write_vcom: Command::WriteVCOM(0x3C),
+            write_lut: None,
+            data_entry_mode: Command::DataEntryMode(DataEntryMode::IncrementYIncrementX, IncrementAxis::Horizontal),
+            dimensions: None,
+            rotation: Rotation::default(),
+        }
+    }
+}
+
+impl<'a> Builder<'a> {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn dummy_line_period(self, dummy_line_period: u8) -> Self {
+        Self {
+            dummy_line_period: Command::DummyLinePeriod(dummy_line_period),
+            ..self
+        }
+    }
+
+    pub fn gate_line_width(self, gate_line_width: u8) -> Self {
+        Self {
+            gate_line_width: Command::GateLineWidth(gate_line_width),
+            ..self
+        }
+    }
+
+    pub fn vcom(self, value: u8) -> Self {
+        Self {
+            write_vcom: Command::WriteVCOM(value),
+            ..self
+        }
+    }
+
+    pub fn lut(self, lut: &'a [u8]) -> Self {
+        Self {
+            write_lut: Some(BufCommand::WriteLUT(lut)),
+            ..self
+        }
+    }
+
+    pub fn data_entry_mode(self, data_entry_mode: DataEntryMode, increment_axis: IncrementAxis) -> Self {
+        Self {
+            data_entry_mode: Command::DataEntryMode(data_entry_mode, increment_axis),
+            ..self
+        }
+    }
+
+    pub fn dimensions(self, dimensions: Dimensions) -> Self {
+        Self {
+            dimensions: Some(dimensions),
+            ..self
+        }
+    }
+
+    pub fn rotation(self, rotation: Rotation) -> Self {
+        Self {
+            rotation,
+            ..self
+        }
+    }
+
+    pub fn build(self) -> Result<Config<'a>, BuilderError> {
+        Ok(Config {
+            dummy_line_period: self.dummy_line_period,
+            gate_line_width: self.gate_line_width,
+            write_vcom: self.write_vcom,
+            write_lut: self.write_lut,
+            data_entry_mode: self.data_entry_mode,
+            dimensions: self.dimensions.ok_or_else(|| BuilderError {})?,
+            rotation: self.rotation,
+        })
+    }
+}

src/display.rs

@@ -1,5 +1,6 @@
 use hal;
 
+use config::Config;
 use command::{BufCommand, Command, DataEntryMode, DeepSleepMode, IncrementAxis};
 use interface::DisplayInterface;
 
@@ -11,8 +12,6 @@ const MAX_GATE_OUTPUTS: usize = 296;
 const ANALOG_BLOCK_CONTROL_MAGIC: u8 = 0x54;
 const DIGITAL_BLOCK_CONTROL_MAGIC: u8 = 0x3B;
 
-struct Config {}
-
 pub struct Dimensions {
     pub rows: u16,
     pub cols: u8,
@@ -32,16 +31,15 @@ impl Default for Rotation {
     }
 }
 
-pub struct Display<I> where I: DisplayInterface {
+pub struct Display<'a, I> where I: DisplayInterface {
     interface: I,
-    dimensions: Dimensions,
-    rotation: Rotation,
+    config: Config<'a>,
 }
 
-impl<I> Display<I> where I: DisplayInterface {
-    pub fn new(interface: I, dimensions: Dimensions, rotation: Rotation) -> Self {
+impl<'a, I> Display<'a, I> where I: DisplayInterface {
+    pub fn new(interface: I, config: Config<'a>) -> Self {
         // TODO: Assert dimensions are evenly divisible by 8
-        Self { interface, dimensions, rotation }
+        Self { interface, config }
     }
 
     /// Perform a hardware reset followed by software reset
@@ -50,34 +48,37 @@ impl<I> Display<I> where I: DisplayInterface {
         Command::SoftReset.execute(&mut self.interface)?;
         self.interface.busy_wait();
 
-        self.init(Config {})
+        self.init()
     }
 
     /// Initialise the controller according to Section 9: Typical Operating Sequence
     /// from the data sheet
-    fn init(&mut self, config: Config) -> Result<(), I::Error> {
+    fn init(&mut self) -> Result<(), I::Error> {
         Command::AnalogBlockControl(ANALOG_BLOCK_CONTROL_MAGIC).execute(&mut self.interface)?;
         Command::DigitalBlockControl(DIGITAL_BLOCK_CONTROL_MAGIC).execute(&mut self.interface)?;
 
-        Command::DriverOutputControl(self.dimensions.rows, 0x00).execute(&mut self.interface)?;
+        Command::DriverOutputControl(self.config.dimensions.rows, 0x00).execute(&mut self.interface)?;
 
-        Command::DummyLinePeriod(0x07).execute(&mut self.interface)?;
-        Command::GateLineWidth(0x04).execute(&mut self.interface)?;
+        self.config.dummy_line_period.execute(&mut self.interface)?;
+        self.config.gate_line_width.execute(&mut self.interface)?;
 
         // Command::GateDrivingVoltage(0b10000 | 0b0001);
         // Command::SourceDrivingVoltage(0x2D, 0xB2, 0x22).execute(&mut self.interface)?;
-        Command::WriteVCOM(0x3C).execute(&mut self.interface)?;
+        self.config.write_vcom.execute(&mut self.interface)?;
 
         // POR is HiZ. Need pull from config
         // Command::BorderWaveform(u8).execute(&mut self.interface)?;
 
-        BufCommand::WriteLUT(&LUT_RED).execute(&mut self.interface)?;
+        // BufCommand::WriteLUT(&LUT_RED).execute(&mut self.interface)?;
+        if let Some(ref write_lut) = self.config.write_lut {
+            write_lut.execute(&mut self.interface)?;
+        }
 
-        Command::DataEntryMode(DataEntryMode::IncrementYIncrementX, IncrementAxis::Horizontal).execute(&mut self.interface)?;
+        self.config.data_entry_mode.execute(&mut self.interface)?;
 
-        let end = self.dimensions.cols / 8 - 1;
+        let end = self.config.dimensions.cols / 8 - 1;
         Command::StartEndXPosition(0, end).execute(&mut self.interface)?;
-        Command::StartEndYPosition(0, self.dimensions.rows).execute(&mut self.interface)?;
+        Command::StartEndYPosition(0, self.config.dimensions.rows).execute(&mut self.interface)?;
 
         Ok(())
     }
@@ -112,15 +113,15 @@ impl<I> Display<I> where I: DisplayInterface {
     }
 
     pub fn rows(&self) -> u16 {
-        self.dimensions.rows
+        self.config.dimensions.rows
     }
 
     pub fn cols(&self) -> u8 {
-        self.dimensions.cols
+        self.config.dimensions.cols
     }
 
     pub fn rotation(&self) -> Rotation {
-        self.rotation
+        self.config.rotation
     }
 }
 

src/graphics.rs

@@ -5,13 +5,13 @@ use interface::DisplayInterface;
 use core::ops::{Deref, DerefMut};
 
 pub struct GraphicDisplay<'a, I> where I: DisplayInterface {
-    display: Display<I>,
+    display: Display<'a, I>,
     black_buffer: &'a mut [u8],
     red_buffer: &'a mut [u8],
 }
 
 impl<'a, I> GraphicDisplay<'a, I> where I: DisplayInterface {
-    pub fn new(display: Display<I>, black_buffer: &'a mut [u8], red_buffer: &'a mut [u8]) -> Self {
+    pub fn new(display: Display<'a, I>, black_buffer: &'a mut [u8], red_buffer: &'a mut [u8]) -> Self {
         GraphicDisplay { display, black_buffer, red_buffer }
     }
 
@@ -58,15 +58,15 @@ impl<'a, I> GraphicDisplay<'a, I> where I: DisplayInterface {
 }
 
 impl<'a, I> Deref for GraphicDisplay<'a, I> where I: DisplayInterface {
-    type Target = Display<I>;
+    type Target = Display<'a, I>;
 
-    fn deref(&self) -> &Display<I> {
+    fn deref(&self) -> &Display<'a, I> {
         &self.display
     }
 }
 
 impl<'a, I> DerefMut for GraphicDisplay<'a, I> where I: DisplayInterface {
-    fn deref_mut(&mut self) -> &mut Display<I> {
+    fn deref_mut(&mut self) -> &mut Display<'a, I> {
         &mut self.display
     }
 }

src/lib.rs

@@ -6,14 +6,16 @@ extern crate embedded_hal as hal;
 #[macro_use]
 extern crate std;
 
+mod color;
 mod command;
-mod interface;
+mod config;
 mod display;
 mod graphics;
-mod color;
+mod interface;
 
 pub use interface::DisplayInterface;
 pub use interface::Interface;
 pub use display::{Display, Dimensions, Rotation};
 pub use graphics::GraphicDisplay;
 pub use color::Color;
+pub use config::Builder;