//! QSPI Read Test
//!
//! Following pins are used:
//! MISO    GPIO2
//!
//! GPIO    GPIO3
//!
//! Connect MISO (GPIO2) and GPIO (GPIO3) pins.

//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3

#![no_std]
#![no_main]

use esp_hal::{
    clock::Clocks,
    dma::{Channel, Dma, DmaPriority, DmaRxBuf},
    dma_buffers,
    gpio::{GpioPin, Io, Level, Output},
    prelude::*,
    spi::{
        master::{Address, Command, Spi, SpiDma},
        HalfDuplexMode,
        SpiDataMode,
        SpiMode,
    },
    Blocking,
};
use hil_test as _;

cfg_if::cfg_if! {
    if #[cfg(any(
        feature = "esp32",
        feature = "esp32s2",
    ))] {
        use esp_hal::dma::Spi2DmaChannel as DmaChannel0;
    } else {
        use esp_hal::dma::DmaChannel0;
    }
}

struct Context {
    spi: esp_hal::peripherals::SPI2,
    dma_channel: Channel<'static, DmaChannel0, Blocking>,
    miso: esp_hal::gpio::GpioPin<2>,
    miso_mirror: Output<'static, GpioPin<3>>,
    clocks: Clocks<'static>,
}

fn execute(
    mut spi: SpiDma<'static, esp_hal::peripherals::SPI2, DmaChannel0, HalfDuplexMode, Blocking>,
    mut miso_mirror: Output<'static, GpioPin<3>>,
    wanted: u8,
) {
    const DMA_BUFFER_SIZE: usize = 4;

    let (buffer, descriptors, _, _) = dma_buffers!(DMA_BUFFER_SIZE, 0);
    let mut dma_rx_buf = DmaRxBuf::new(descriptors, buffer).unwrap();

    miso_mirror.set_low();

    let transfer = spi
        .read(
            SpiDataMode::Quad,
            Command::None,
            Address::None,
            0,
            dma_rx_buf,
        )
        .map_err(|e| e.0)
        .unwrap();
    (spi, dma_rx_buf) = transfer.wait();

    assert_eq!(dma_rx_buf.as_slice(), &[wanted; DMA_BUFFER_SIZE]);

    // SPI should read all '1's
    miso_mirror.set_high();

    let transfer = spi
        .read(
            SpiDataMode::Quad,
            Command::None,
            Address::None,
            0,
            dma_rx_buf,
        )
        .map_err(|e| e.0)
        .unwrap();

    (_, dma_rx_buf) = transfer.wait();

    assert_eq!(dma_rx_buf.as_slice(), &[0xFF; DMA_BUFFER_SIZE]);
}

#[cfg(test)]
#[embedded_test::tests]
mod tests {
    use super::*;

    #[init]
    fn init() -> Context {
        let (peripherals, clocks) = esp_hal::init(esp_hal::Config::default());

        let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
        let miso = io.pins.gpio2;

        let miso_mirror = Output::new(io.pins.gpio3, Level::High);

        let dma = Dma::new(peripherals.DMA);

        cfg_if::cfg_if! {
            if #[cfg(any(feature = "esp32", feature = "esp32s2"))] {
                let dma_channel = dma.spi2channel;
            } else {
                let dma_channel = dma.channel0;
            }
        }

        let dma_channel = dma_channel.configure(false, DmaPriority::Priority0);

        Context {
            spi: peripherals.SPI2,
            dma_channel,
            miso,
            miso_mirror,
            clocks,
        }
    }

    #[test]
    #[timeout(3)]
    fn test_spi_reads_correctly_from_gpio_pin_0(ctx: Context) {
        let spi = Spi::new_half_duplex(ctx.spi, 100.kHz(), SpiMode::Mode0, &ctx.clocks)
            .with_pins(
                esp_hal::gpio::NO_PIN,
                Some(ctx.miso),
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
            )
            .with_dma(ctx.dma_channel);

        // SPI should read '0b11101110'
        super::execute(spi, ctx.miso_mirror, 238);
    }

    #[test]
    #[timeout(3)]
    fn test_spi_reads_correctly_from_gpio_pin_1(ctx: Context) {
        let spi = Spi::new_half_duplex(ctx.spi, 100.kHz(), SpiMode::Mode0, &ctx.clocks)
            .with_pins(
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                Some(ctx.miso),
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
            )
            .with_dma(ctx.dma_channel);

        // SPI should read '0b11011101'
        super::execute(spi, ctx.miso_mirror, 221);
    }

    #[test]
    #[timeout(3)]
    fn test_spi_reads_correctly_from_gpio_pin_2(ctx: Context) {
        let spi = Spi::new_half_duplex(ctx.spi, 100.kHz(), SpiMode::Mode0, &ctx.clocks)
            .with_pins(
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                Some(ctx.miso),
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
            )
            .with_dma(ctx.dma_channel);

        // SPI should read '0b10111011'
        super::execute(spi, ctx.miso_mirror, 187);
    }

    #[test]
    #[timeout(3)]
    fn test_spi_reads_correctly_from_gpio_pin_3(ctx: Context) {
        let spi = Spi::new_half_duplex(ctx.spi, 100.kHz(), SpiMode::Mode0, &ctx.clocks)
            .with_pins(
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                esp_hal::gpio::NO_PIN,
                Some(ctx.miso),
                esp_hal::gpio::NO_PIN,
            )
            .with_dma(ctx.dma_channel);

        // SPI should read '0b01110111'
        super::execute(spi, ctx.miso_mirror, 119);
    }
}