Initial implementation of OLED driver with shared SPI bus

src/display/secondary_oled.rs

@@ -1 +1,54 @@
-// Secondary OLED module
+use core::cell::RefCell;
+use display_interface_spi::SPIInterface;
+use embedded_graphics::pixelcolor::BinaryColor;
+use embedded_graphics::prelude::*;
+use embedded_hal::digital::OutputPin as EhOutputPin;
+use embedded_hal_bus::spi::RefCellDevice;
+use esp_hal::delay::Delay;
+use esp_hal::gpio::{Level, Output, OutputConfig, OutputPin};
+use ssd1306::mode::BufferedGraphicsMode;
+use ssd1306::prelude::*;
+use ssd1306::Ssd1306;
+
+pub type SecondaryOledDisplay<'a, BUS, DC> = Ssd1306<
+    SPIInterface<
+        RefCellDevice<'a, BUS, Output<'a>, Delay>,
+        DC,
+    >,
+    DisplaySize128x64,
+    BufferedGraphicsMode<DisplaySize128x64>,
+>;
+
+pub fn init_secondary_oled_on_bus<'a, BUS, CS, RES, DC>(
+    spi_bus: &'a RefCell<BUS>,
+    cs: CS,
+    mut res: RES,
+    dc: DC,
+    delay: &mut Delay,
+) -> SecondaryOledDisplay<'a, BUS, DC>
+where
+    BUS: embedded_hal::spi::SpiBus,
+    CS: OutputPin + 'static,
+    RES: EhOutputPin,
+    DC: EhOutputPin,
+{
+    let cs_pin = Output::new(cs, Level::High, OutputConfig::default());
+    let spi_dev = RefCellDevice::new(spi_bus, cs_pin, *delay).unwrap();
+    let interface = SPIInterface::new(spi_dev, dc);
+
+    let mut display = Ssd1306::new(
+        interface,
+        DisplaySize128x64,
+        DisplayRotation::Rotate0,
+    )
+    .into_buffered_graphics_mode();
+
+    display.reset(&mut res, delay).unwrap();
+    display.init().unwrap();
+    display.clear(BinaryColor::Off).unwrap();
+    display.flush().unwrap();
+
+    display
+}
+
+