clock_generator/firmware/rust/src/lcd.rs

use atmega_hal::{
    clock::MHz8,
    delay::Delay,
    port::{mode::Output, Pin, PB0, PB1},
    Spi,
};
use avr_device::interrupt;
use core::convert::TryInto;
use embedded_hal::{blocking::delay::DelayMs, spi::FullDuplex};
use nb::block;

use crate::{
    assets::SYMBOL_TABLE,
    screen::{Screen, Screens},
};

// TODO: Make `cd` and `rst` pins generic pins
pub struct Lcd {
    pub spi: Spi,
    pub cd: Pin<Output, PB0>,
    rst: Pin<Output, PB1>,
}

impl Lcd {
    pub fn new(spi: Spi, cd: Pin<Output, PB0>, rst: Pin<Output, PB1>) -> Self {
        Self { spi, cd, rst }
    }

    pub fn init(&mut self, contrast: u8) {
        let mut delay = Delay::<MHz8>::new();

        // TODO: Test if delay is really needed
        delay.delay_ms(1_u8);
        self.rst.set_high();
        // TODO: Try to reduce delay to a minimum
        delay.delay_ms(1_u8);

        block!(self.spi.send(0x40)).unwrap(); // (6)  Set Scroll Line: Display start line 0
        block!(self.spi.send(0xA1)).unwrap(); // (13) Set SEG direction: SEG reverse
        block!(self.spi.send(0xC0)).unwrap(); // (14) Set COM direction: Normal COM0 - COM63
                                              // block!(spi.send(0xA4)).unwrap(); // (10) Set All Pixel On: Disable -> Set All Pixel to ON */
        block!(self.spi.send(0xA6)).unwrap(); // (11) Set Inverse Display: Display inverse off
        block!(self.spi.send(0xA2)).unwrap(); // (17) Set LCD Bias Ratio: Set Bias 1/9 (Duty 1/65)
        block!(self.spi.send(0x2F)).unwrap(); // (5)  Set Power Control: Booster, Regulator and Follower on
        block!(self.spi.send(0x27)).unwrap(); // (8)  Set VLCD Resistor Ratio: Set Contrast
                                              // block!(spi.send(0xEE)).unwrap(); // (18) Reset Cursor Update Mode
        block!(self.spi.send(0x81)).unwrap(); // (9)  Set Electronic Volume: Set Contrast
        block!(self.spi.send(contrast)).unwrap(); // (9)  Set Electronic Volume: Set Contrast
                                                  // block!(spi.send(0xFA)).unwrap(); // (25) Set Adv. Program Control 0: Set Temperature compensation curve to -0.11%/°C
                                                  // block!(spi.send(0x90)).unwrap(); // (25) Set Adv. Program Control 0: Set Temperature compensation curve to -0.11%/°C
        block!(self.spi.send(0xAF)).unwrap(); // (12) Set Display Enable: Display on

        // TODO: This delay fixes issues, try find a better solution
        delay.delay_ms(1_u8);
    }

    pub fn move_cursor(&mut self, segment: u8, page: u8) {
        assert!(segment < 102);
        assert!(page < 8);

        block!(self.spi.send(0x0F & segment)).unwrap();
        block!(self.spi.send(0x10 + (segment >> 4))).unwrap();
        block!(self.spi.send(0xB0 + page)).unwrap();
    }

    fn clear(&mut self) {
        let mut delay = Delay::<MHz8>::new();

        for page in 0..8 {
            self.move_cursor(0, page as u8);

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_high();

            for _ in 0..102 {
                block!(self.spi.send(0x00)).unwrap();
            }

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_low();
        }
    }

    fn fill(&mut self, segment: u8, page: u8, width: u8, data: u8) {
        assert!(segment + width <= 102);
        let mut delay = Delay::<MHz8>::new();

        self.move_cursor(segment, page);

        // TODO: This delay fixes issues, try find a better solution
        delay.delay_ms(1_u8);
        self.cd.set_high();

        for _ in 0..width {
            block!(self.spi.send(data)).unwrap();
        }

        // TODO: This delay fixes issues, try find a better solution
        delay.delay_ms(1_u8);
        self.cd.set_low();
    }

    pub fn fill_area(&mut self, segment: u8, page: u8, width: u8, height: u8, data: u8) {
        assert!(page + height <= 8);

        for i in 0..height {
            self.fill(segment, page + i, width, data);
        }
    }

    pub fn print(&mut self, segment: u8, page: u8, string: &str) {
        let mut delay = Delay::<MHz8>::new();

        for i in 0..2 {
            self.move_cursor(segment, page + i);

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_high();

            block!(self.spi.send(0x00)).unwrap();
            block!(self.spi.send(0x00)).unwrap();
            for c in string.chars() {
                for segment in SYMBOL_TABLE[c as usize - 48][i as usize] {
                    block!(self.spi.send(*segment)).unwrap();
                }
                block!(self.spi.send(0x00)).unwrap();
            }
            block!(self.spi.send(0x00)).unwrap();

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_low();
        }
    }

    pub fn print_inverted(&mut self, segment: u8, page: u8, string: &str) {
        let mut delay = Delay::<MHz8>::new();

        for i in 0..2 {
            self.move_cursor(segment, page + i);

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_high();

            block!(self.spi.send(0xFF)).unwrap();
            block!(self.spi.send(0xFF)).unwrap();
            for c in string.chars() {
                for segment in SYMBOL_TABLE[c as usize - 48][i as usize] {
                    block!(self.spi.send(!*segment)).unwrap();
                }
                block!(self.spi.send(0xFF)).unwrap();
            }
            block!(self.spi.send(0xFF)).unwrap();

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_low();
        }
    }

    pub fn print_u8(&mut self, segment: u8, page: u8, digits: u8, data: u8) {
        assert!(digits <= 3);
        let mut delay = Delay::<MHz8>::new();

        let mut array = [0usize; 3];
        for (i, item) in array.iter_mut().enumerate() {
            *item = ((data / 10_u8.pow(i.try_into().unwrap())) % 10).into();
        }
        array.reverse();

        for i in 0..2 {
            self.move_cursor(segment, page + i);

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_high();

            block!(self.spi.send(0x00)).unwrap();
            block!(self.spi.send(0x00)).unwrap();
            for j in 3 - digits..3 {
                for segment in SYMBOL_TABLE[array[j as usize]][i as usize] {
                    block!(self.spi.send(*segment)).unwrap();
                }
                block!(self.spi.send(0x00)).unwrap();
            }
            block!(self.spi.send(0x00)).unwrap();

            // TODO: This delay fixes issues, try find a better solution
            delay.delay_ms(1_u8);
            self.cd.set_low();
        }
    }

    pub fn draw(&mut self, screen: &Screens) {
        interrupt::free(|_cs| {
            self.clear();

            match screen {
                Screens::Splash(splash) => {
                    splash.draw(self);
                }
                Screens::Home(home) => {
                    home.draw(self);
                }
                Screens::Setup(setup) => {
                    setup.draw(self);
                }
            }
        });
    }
}