99bf346898
* Clean up passing clocks to drivers * Update changelog * Initialise Clocks in a critical section * Fix calling now() before init * Fix doc * Fix esp-wifi migration guide * Add safety comment * Update tests
80 lines
2.2 KiB
Rust
80 lines
2.2 KiB
Rust
//! This shows how to continously receive data via I2S.
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//!
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//! Without an additional I2S source device you can connect 3V3 or GND to DIN
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//! to read 0 or 0xFF or connect DIN to WS to read two different values.
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//!
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//! You can also inspect the MCLK, BCLK and WS with a logic analyzer.
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//!
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//! The following wiring is assumed:
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//! - MCLK => GPIO0 (not supported on ESP32)
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//! - BCLK => GPIO2
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//! - WS => GPIO4
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//! - DIN => GPIO5
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//% CHIPS: esp32 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
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#![no_std]
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#![no_main]
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use esp_backtrace as _;
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use esp_hal::{
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dma::{Dma, DmaPriority},
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dma_buffers,
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gpio::Io,
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i2s::{DataFormat, I2s, I2sReadDma, Standard},
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prelude::*,
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};
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use esp_println::println;
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#[entry]
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fn main() -> ! {
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let peripherals = esp_hal::init(esp_hal::Config::default());
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let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
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let dma = Dma::new(peripherals.DMA);
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#[cfg(any(feature = "esp32", feature = "esp32s2"))]
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let dma_channel = dma.i2s0channel;
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#[cfg(not(any(feature = "esp32", feature = "esp32s2")))]
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let dma_channel = dma.channel0;
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let (_, tx_descriptors, mut rx_buffer, rx_descriptors) = dma_buffers!(0, 4 * 4092);
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// Here we test that the type is
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// 1) reasonably simple (or at least this will flag changes that may make it
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// more complex)
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// 2) can be spelled out by the user
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let i2s = I2s::new(
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peripherals.I2S0,
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Standard::Philips,
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DataFormat::Data16Channel16,
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44100.Hz(),
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dma_channel.configure(false, DmaPriority::Priority0),
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tx_descriptors,
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rx_descriptors,
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);
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#[cfg(not(feature = "esp32"))]
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let i2s = i2s.with_mclk(io.pins.gpio0);
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let mut i2s_rx = i2s
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.i2s_rx
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.with_bclk(io.pins.gpio2)
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.with_ws(io.pins.gpio4)
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.with_din(io.pins.gpio5)
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.build();
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let mut transfer = i2s_rx.read_dma_circular(&mut rx_buffer).unwrap();
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println!("Started transfer");
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loop {
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let avail = transfer.available();
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if avail > 0 {
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let mut rcv = [0u8; 5000];
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transfer.pop(&mut rcv[..avail]).unwrap();
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println!("Received {:x?}...", &rcv[..30]);
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}
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}
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}
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