Init commit of ili dispalay test application

src/ilidisplay.rs

@@ -0,0 +1,110 @@
+
+use std::error::Error;
+use std::thread;
+use std::time::Duration;
+
+
+use rppal::gpio::{Gpio, OutputPin};
+use rppal::spi::{Bus, Mode, Segment, SlaveSelect, Spi, Polarity};
+use rppal::system::DeviceInfo;
+
+use image::RgbImage;
+
+pub struct IliDisplay {
+    spi: Spi,
+    dc_pin: OutputPin,
+    reset_pin: OutputPin,
+    led_pin: OutputPin,
+}
+
+// Gpio uses BCM pin numbering. BCM GPIO 23 is tied to physical pin 16.
+const GPIO_LED: u8 = 23;
+const GPIO_DC: u8 = 24;
+const GPIO_RESET: u8 = 25;
+
+impl IliDisplay {
+
+
+   // Initialize an IliDisplay struct with defaults
+
+   pub fn init() -> Result<IliDisplay, Box<dyn Error>>  {
+
+     let mut gpio = Gpio::new()?;
+
+     let mut dc_pin = gpio.get(GPIO_DC)?.into_output();
+     let mut led_pin = gpio.get(GPIO_LED)?.into_output();
+     let mut reset_pin = gpio.get(GPIO_RESET)?.into_output();
+
+     let mut spi = Spi::new(Bus::Spi0, SlaveSelect::Ss0, 1_000_000, Mode::Mode0)?;
+     spi.set_ss_polarity(Polarity::ActiveHigh);
+
+     return Ok(IliDisplay {
+       spi, dc_pin, reset_pin, led_pin
+     });
+   }
+
+
+   pub fn send_command (&mut self, command: u8,  data: &[u8]) {
+     // set DC low for byte one
+     self.dc_pin.set_low();
+     self.spi.write(&[command]);
+     self.dc_pin.set_high();
+     if (data.len() > 0) {
+       self.spi.write(data);
+     }
+   }
+
+
+   // Send initialization sequence to Ili9488
+   pub fn init_chip(&mut self) {
+
+     self.dc_pin.set_high();
+     // drop the reset pin to low and set it high again to fully reset the display
+     self.reset_pin.set_high();
+     thread::sleep(Duration::from_millis(20));
+     self.reset_pin.set_low();
+     thread::sleep(Duration::from_millis(100));
+     self.reset_pin.set_high();
+     thread::sleep(Duration::from_millis(20));
+
+     self.send_command(0x01, &[]);
+     thread::sleep(Duration::from_millis(50));
+     self.send_command(0x28, &[]);
+     self.send_command(0xE0, &[0x00, 0x03, 0x09, 0x08, 0x16, 0x0A, 0x3F, 0x78, 0x4C, 0x09, 0x0A, 0x08, 0x16, 0x1A, 0x0F]);
+     self.send_command(0xE1, &[0x00, 0x16, 0x19, 0x03, 0x0F, 0x05, 0x32, 0x45, 0x46, 0x04, 0x0E, 0x0D, 0x35, 0x37, 0x0F]);
+     self.send_command(0xC0, &[0x17, 0x15]);
+     self.send_command(0xC1, &[0x41]);
+     self.send_command(0x36, &[0xE8]);
+     self.send_command(0x3A, &[0x66]);
+     self.send_command(0xB0, &[0x80]);
+     self.send_command(0xB1, &[0xA0]);
+     self.send_command(0xB4, &[0x02]);
+     self.send_command(0xB6, &[0x02, 0x02, 0x3B]);
+     self.send_command(0xE9, &[0x00]);
+     self.send_command(0xF7, &[0xA9, 0x51, 0x2C, 0x82]);
+     self.send_command(0x11, &[]);
+     thread::sleep(Duration::from_millis(100));
+     self.send_command(0x29, &[]);
+     thread::sleep(Duration::from_millis(20));
+   }
+   
+   pub fn turn_on (&mut self) {
+     self.led_pin.set_high();
+   }
+
+   pub fn turn_off (&mut self) {
+     self.led_pin.set_low();
+   }
+
+   // send one image to the display
+   pub fn send_image(&mut self, image: RgbImage) -> () {
+     println!("send image");
+     // assume 480x320 for both image and screen
+     self.send_command(0x2A, &[0, 0, (480 >> 8) as u8, (480 & 0xFF) as u8]);
+     self.send_command(0x2B, &[0, 0, (320 >> 8) as u8, (320 & 0xFF) as u8]);
+     let imagedata = image.into_raw();
+     // let imagedata_ref = array_ref![imagedata, 0, 480*320*3];
+     let imagedata_ref = array_ref![imagedata, 0, 4096];
+     self.spi.write(imagedata_ref);
+   }
+}