#![no_std]
#![no_main]
use esp32c3_hal::{
clock::ClockControl,
dma::DmaPriority,
gdma::Gdma,
i2s::{DataFormat, I2s, I2s0New, I2sReadDma, MclkPin, PinsBclkWsDin, Standard},
peripherals::Peripherals,
prelude::*,
timer::TimerGroup,
Rtc,
IO,
};
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();
let mut rtc = Rtc::new(peripherals.RTC_CNTL);
let timer_group0 = TimerGroup::new(peripherals.TIMG0, &clocks);
let mut wdt0 = timer_group0.wdt;
let timer_group1 = TimerGroup::new(peripherals.TIMG1, &clocks);
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 dma = Gdma::new(peripherals.DMA, &mut system.peripheral_clock_control);
let dma_channel = dma.channel0;
let mut tx_descriptors = [0u32; 8 * 3];
let mut rx_descriptors = [0u32; 8 * 3];
let i2s = I2s::new(
peripherals.I2S,
MclkPin::new(io.pins.gpio4),
Standard::Philips,
DataFormat::Data16Channel16,
44100u32.Hz(),
dma_channel.configure(
false,
&mut tx_descriptors,
&mut rx_descriptors,
DmaPriority::Priority0,
),
&mut system.peripheral_clock_control,
&clocks,
);
let i2s_rx = i2s.i2s_rx.with_pins(PinsBclkWsDin::new(
io.pins.gpio1,
io.pins.gpio2,
io.pins.gpio5,
));
let buffer = dma_buffer();
let mut transfer = i2s_rx.read_dma_circular(buffer).unwrap();
println!("Started transfer");
loop {
let avail = transfer.available();
if avail > 0 {
let mut rcv = [0u8; 5000];
transfer.pop(&mut rcv[..avail]).unwrap();
println!("Received {:x?}...", &rcv[..30]);
}
}
}
fn dma_buffer() -> &'static mut [u8; 4092 * 4] {
static mut BUFFER: [u8; 4092 * 4] = [0u8; 4092 * 4];
unsafe { &mut BUFFER }
}