feat: Add support for the 4.2in V2 display

README.md

@@ -61,6 +61,7 @@ epd4in2.sleep(&mut spi, &mut delay)
 | [5.83 Inch B/W/R (b)](https://www.waveshare.com/5.83inch-e-Paper-B.htm) | Black, White, Red | ✕ | Not officially | ✔ | ✔ |
 | [5.65 Inch 7 Color (F)](https://www.waveshare.com/5.65inch-e-paper-module-f.htm) | Black, White, Red, Green, Blue, Yellow, Orange | ✕ | ✕ | ✔ | ✔ |
 | [4.2 Inch B/W (A)](https://www.waveshare.com/product/4.2inch-e-paper-module.htm) | Black, White | ✕ | Not officially [[2](#2-42-inch-e-ink-blackwhite---partial-refresh)] | ✔ | ✔ |
+| [4.2 Inch B/W V2 (A)](https://www.waveshare.com/4.2inch-e-paper-module.htm) | Black, White | ✕ | ✔ | ✔ | ✔ |
 | [2.13 Inch B/W (A) V2](https://www.waveshare.com/product/2.13inch-e-paper-hat.htm) | Black, White | ✕ | ✔ | ✔  | ✔  |
 | [2.13 Inch B/W/R (B/C) V2](https://www.waveshare.com/product/raspberry-pi/displays/e-paper/2.13inch-e-paper-hat-b.htm) | Black, White, Red | ✕ | ✕ | ✔  | ✔  |
 | [2.9 Inch B/W/R (B/C)](https://www.waveshare.com/product/displays/e-paper/epaper-2/2.9inch-e-paper-module-b.htm) | Black, White, Red | ✕ | ✕ | ✔ | ✔ |

src/epd4in2_v2/command.rs

@@ -0,0 +1,29 @@
+//! SPI commands for the Waveshare 4.2" V2 E-Ink Display
+use crate::traits;
+
+#[derive(Copy, Clone)]
+pub(crate) enum Command {
+    DriverOutputControl = 0x01,
+    DeepSleepMode = 0x10,
+    DataEntryModeSetting = 0x11,
+    SwReset = 0x12,
+    TemperatureSensorControl = 0x18,
+    WriteTemperatureRegister = 0x1a,
+    MasterActivation = 0x20,
+    DisplayUpdateControl1 = 0x21,
+    DisplayUpdateControl2 = 0x22,
+    WriteRamBw = 0x24,
+    WriteRamRed = 0x26,
+    BorderWaveformControl = 0x3c,
+    SetRamXAddressStartEnd = 0x44,
+    SetRamYAddressStartEnd = 0x45,
+    SetRamXAddressCounter = 0x4e,
+    SetRamYAddressCounter = 0x4f,
+}
+
+impl traits::Command for Command {
+    /// Returns the address of the command
+    fn address(self) -> u8 {
+        self as u8
+    }
+}