//! This shows how to continuously receive data via I2S.
//!
//! Without an additional I2S source device you can connect 3V3 or GND to DIN
//! to read 0 or 0xFF or connect DIN to WS to read two different values.
//!
//! You can also inspect the MCLK, BCLK and WS with a logic analyzer.
//!
//! The following wiring is assumed:
//! - MCLK =>  GPIO0 (not supported on ESP32)
//! - BCLK =>  GPIO2
//! - WS   =>  GPIO4
//! - DIN  =>  GPIO5

//% CHIPS: esp32 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3

#![no_std]
#![no_main]

use esp_backtrace as _;
use esp_hal::{
    dma::Dma,
    dma_buffers,
    i2s::master::{DataFormat, I2s, Standard},
    prelude::*,
};
use esp_println::println;

#[entry]
fn main() -> ! {
    let peripherals = esp_hal::init(esp_hal::Config::default());

    let dma = Dma::new(peripherals.DMA);
    #[cfg(any(feature = "esp32", feature = "esp32s2"))]
    let dma_channel = dma.i2s0channel;
    #[cfg(not(any(feature = "esp32", feature = "esp32s2")))]
    let dma_channel = dma.channel0;

    let (mut rx_buffer, rx_descriptors, _, tx_descriptors) = dma_buffers!(4 * 4092, 0);

    // Here we test that the type is
    // 1) reasonably simple (or at least this will flag changes that may make it
    // more complex)
    // 2) can be spelled out by the user
    let i2s = I2s::new(
        peripherals.I2S0,
        Standard::Philips,
        DataFormat::Data16Channel16,
        44100.Hz(),
        dma_channel,
        rx_descriptors,
        tx_descriptors,
    );

    #[cfg(not(feature = "esp32"))]
    let i2s = i2s.with_mclk(peripherals.GPIO0);

    let mut i2s_rx = i2s
        .i2s_rx
        .with_bclk(peripherals.GPIO2)
        .with_ws(peripherals.GPIO4)
        .with_din(peripherals.GPIO5)
        .build();

    let mut transfer = i2s_rx.read_dma_circular(&mut rx_buffer).unwrap();
    println!("Started transfer");

    loop {
        let avail = transfer.available().unwrap();

        if avail > 0 {
            let mut rcv = [0u8; 5000];
            transfer.pop(&mut rcv[..avail]).unwrap();
            println!("Received {:x?}...", &rcv[..30]);
        }
    }
}