longan-nano 0.3.0

Board support package for the Longan Nano board
Documentation 
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//! On-board LCD

use embedded_hal::digital::v2::OutputPin;
use gd32vf103xx_hal::afio::Afio;
use gd32vf103xx_hal::delay::McycleDelay;
use gd32vf103xx_hal::gpio::gpioa::{PA5, PA6, PA7};
use gd32vf103xx_hal::gpio::gpiob::{PB0, PB1, PB2};
use gd32vf103xx_hal::gpio::{Alternate, Floating, Input, Output, PushPull};
use gd32vf103xx_hal::pac::SPI0;
use gd32vf103xx_hal::rcu::Rcu;
use gd32vf103xx_hal::spi::{Spi, MODE_0};
use gd32vf103xx_hal::time::U32Ext;
use st7735_lcd::{Orientation, ST7735};

/// Sets up all the needed GPIO pins for the LCD
///
/// ```
/// let gpioa = dp.GPIOA.split(&mut rcu);
/// let gpiob = dp.GPIOB.split(&mut rcu);
/// let lcd_pins = lcd_pins!(gpioa, gpiob);
/// ```
#[macro_export]
macro_rules! lcd_pins {
    ($gpioa:ident, $gpiob:ident) => {{
        $crate::lcd::LcdPins {
            miso: $gpioa.pa6.into_floating_input(),
            mosi: $gpioa.pa7.into_alternate_push_pull(),
            sck: $gpioa.pa5.into_alternate_push_pull(),
            cs: $gpiob.pb2.into_push_pull_output(),
            dc: $gpiob.pb0.into_push_pull_output(),
            rst: $gpiob.pb1.into_push_pull_output(),
        }
    }};
}

type MisoPin = PA6<Input<Floating>>;
type MosiPin = PA7<Alternate<PushPull>>;
type SckPin = PA5<Alternate<PushPull>>;
type CsPin = PB2<Output<PushPull>>;
type DcPin = PB0<Output<PushPull>>;
type RstPin = PB1<Output<PushPull>>;
type SpiType = Spi<SPI0, (SckPin, MisoPin, MosiPin)>;
pub type Lcd = ST7735<SpiType, DcPin, RstPin>;

/// Pins consumed by LCD driver
pub struct LcdPins {
    pub miso: MisoPin,
    pub mosi: MosiPin,
    pub sck: SckPin,
    pub cs: CsPin,
    pub dc: DcPin,
    pub rst: RstPin,
}

/// Constructs LCD driver from the required components
pub fn configure(spi: SPI0, pins: LcdPins, afio: &mut Afio, rcu: &mut Rcu) -> Lcd {
    let (width, height) = (160, 80);
    let spi0 = Spi::spi0(
        spi,
        (pins.sck, pins.miso, pins.mosi),
        afio,
        MODE_0,
        16.mhz(),
        rcu,
    );

    let mut cs = pins.cs;
    cs.set_low().unwrap();

    let mut lcd = ST7735::new(
        spi0, 
        pins.dc, 
        pins.rst, 
        false, 
        true, 
        width, 
        height);
    let mut delay = McycleDelay::new(&rcu.clocks);
    lcd.init(&mut delay).unwrap();
    lcd.set_orientation(&Orientation::Landscape).unwrap();
    lcd.set_offset(1, 26);

    lcd
    }