//! SPI loopback test using DMA
//!
//! Folowing pins are used:
//! SCLK    GPIO6
//! MISO    GPIO2
//! MOSI    GPIO7
//! CS      GPIO10
//!
//! Depending on your target and the board you are using you have to change the
//! pins.
//!
//! This example transfers data via SPI.
//! Connect MISO and MOSI pins to see the outgoing data is read as incoming
//! data.

#![no_std]
#![no_main]

use hal::{
    clock::ClockControl,
    dma::DmaPriority,
    gdma::Gdma,
    gpio::IO,
    peripherals::Peripherals,
    prelude::*,
    spi::{Spi, SpiMode},
    timer::TimerGroup,
    Delay,
    Rtc,
};
use esp_backtrace as _;
use esp_println::println;

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take();
    let mut system = peripherals.SYSTEM.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    // Disable the watchdog timers. For the ESP32-C3, this includes the Super WDT,
    // the RTC WDT, and the TIMG WDTs.
    let mut rtc = Rtc::new(peripherals.RTC_CNTL);
    let timer_group0 = TimerGroup::new(
        peripherals.TIMG0,
        &clocks,
        &mut system.peripheral_clock_control,
    );
    let mut wdt0 = timer_group0.wdt;
    let timer_group1 = TimerGroup::new(
        peripherals.TIMG1,
        &clocks,
        &mut system.peripheral_clock_control,
    );
    let mut wdt1 = timer_group1.wdt;

    rtc.swd.disable();
    rtc.rwdt.disable();
    wdt0.disable();
    wdt1.disable();

    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
    let sclk = io.pins.gpio5;
    let miso = io.pins.gpio7;
    let mosi = io.pins.gpio6;
    let cs = io.pins.gpio4.into_push_pull_output();

    let dma = Gdma::new(peripherals.DMA, &mut system.peripheral_clock_control);
    let dma_channel = dma.channel0;

    let mut descriptors = [0u32; 8 * 3];
    let mut rx_descriptors = [0u32; 8 * 3];

    let mut spi = Spi::new_no_cs(
        peripherals.SPI2,
        sclk,
        mosi,
        miso,
        100u32.kHz(),
        SpiMode::Mode0,
        &mut system.peripheral_clock_control,
        &clocks,
    // );
    )
    .with_dma(dma_channel.configure(
        false,
        &mut descriptors,
        &mut rx_descriptors,
        DmaPriority::Priority0,
    ));

    let mut delay = Delay::new(&clocks);

    let sd = embedded_sdmmc::SdCard::new(spi, cs, delay);
    println!("Size: {}bytes", sd.num_bytes().unwrap());

    loop {}
}