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use std::{thread::sleep, time::Duration};
pub type Buffer = Vec<u8>;
use anyhow::Result;
use rppal::{
gpio::{Gpio, OutputPin},
spi::Spi,
};
const BUS_CLOCK_SPEED: u32 = 2_000_000;
const RST_PIN: u8 = 25;
const DC_PIN: u8 = 24;
const CS_PIN: u8 = 8;
const BL_PIN: u8 = 18;
const WIDTH: u8 = 128;
const HEIGHT: u8 = 64;
#[derive(Debug)]
pub enum Protocol {
SPI,
I2C,
}
#[derive(Debug)]
pub struct Display {
pub width: u8,
pub height: u8,
pub dc_pin: OutputPin,
pub cs_pin: OutputPin,
pub rst_pin: OutputPin,
pub bl_pin: OutputPin,
pub protocol: Protocol,
pub bus: Spi,
pub memory: Buffer,
}
impl Display {
pub fn write_command(&mut self, byte: &[u8]) -> Result<()> {
match self.protocol {
Protocol::SPI => {
self.dc_pin.set_low();
self.spi_write_byte(byte)
}
Protocol::I2C => self.i2c_write_byte(byte),
}
}
pub fn write_data(&mut self, byte: &[u8]) -> Result<()> {
match self.protocol {
Protocol::SPI => {
self.dc_pin.set_high();
self.spi_write_byte(byte)
}
Protocol::I2C => self.i2c_write_byte(byte),
}
}
pub fn spi_write_byte(&mut self, byte: &[u8]) -> Result<()> {
self.bus.write(byte)?;
Ok(())
}
pub fn i2c_write_byte(&self, _byte: &[u8]) -> Result<()> {
Ok(())
}
pub fn reset(&mut self) -> Result<()> {
self.rst_pin.set_high();
sleep(Duration::from_millis(100));
self.rst_pin.set_low();
sleep(Duration::from_millis(100));
self.rst_pin.set_high();
sleep(Duration::from_millis(100));
Ok(())
}
pub fn render(&mut self) -> Result<()> {
for page in 0..8 {
self.write_command(&[0xB0 + page])?;
self.write_command(&[0x02])?;
self.write_command(&[0x10])?;
sleep(Duration::from_millis(10));
match self.protocol {
Protocol::I2C => todo!("implement i2c"),
Protocol::SPI => {
self.dc_pin.set_high();
for index in 0..self.width {
self.spi_write_byte(
&[self.memory[(index + (self.width * page)) as usize]],
)?;
}
}
}
}
Ok(())
}
pub fn initialize(&mut self) -> Result<()> {
self.reset()?;
self.write_command(&[0xAE])?;
self.write_command(&[0x02])?;
self.write_command(&[0x10])?;
self.write_command(&[0x40])?;
self.write_command(&[0x81])?;
self.write_command(&[0xA0])?;
self.write_command(&[0xC0])?;
self.write_command(&[0xA6])?;
self.write_command(&[0xA8])?;
self.write_command(&[0x3F])?;
self.write_command(&[0xD3])?;
self.write_command(&[0x00])?;
self.write_command(&[0xd5])?;
self.write_command(&[0x80])?;
self.write_command(&[0xD9])?;
self.write_command(&[0xF1])?;
self.write_command(&[0xDA])?;
self.write_command(&[0x12])?;
self.write_command(&[0xDB])?;
self.write_command(&[0x40])?;
self.write_command(&[0x20])?;
self.write_command(&[0x02])?;
self.write_command(&[0xA4])?;
self.write_command(&[0xA6])?;
sleep(Duration::from_millis(100));
self.write_command(&[0xAF])?; Ok(())
}
pub fn new() -> Result<Self> {
let gpio = Gpio::new()?;
let rst_pin = gpio.get(RST_PIN)?.into_output();
let mut dc_pin = gpio.get(DC_PIN)?.into_output();
let mut cs_pin = gpio.get(CS_PIN)?.into_output();
let mut bl_pin = gpio.get(BL_PIN)?.into_output();
cs_pin.set_low();
bl_pin.set_high();
dc_pin.set_low();
let bus: Spi = Spi::new(
rppal::spi::Bus::Spi0,
rppal::spi::SlaveSelect::Ss0,
BUS_CLOCK_SPEED,
rppal::spi::Mode::Mode0,
)?;
Ok(Self {
width: WIDTH,
height: HEIGHT,
protocol: Protocol::SPI,
rst_pin,
dc_pin,
cs_pin,
bl_pin,
bus,
memory: vec![0; WIDTH as usize * HEIGHT as usize],
})
}
}