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https://github.com/esp-rs/esp-hal.git
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db409ffe7b
* Unify the system peripheral Whilst the PCR, SYSTEM and DPORT peripherals are different, we currently use them all in the same way. This PR unifies the peripheral name in the hal to `SYSTEM`. The idea is that they all do the same sort of thing, so we can collect them under the same name, and later down the line we can being to expose differences under an extended API. The benifits to this are imo quite big, the examples now are all identical, which makes things easier for esp-wifi, and paves a path towards the multichip hal. Why not do this in the PAC? Imo the pac should be as close to the hardware as possible, and the HAL is where we should abstractions such as this. * changelog
83 lines
2.0 KiB
Rust
83 lines
2.0 KiB
Rust
//! This shows how to continously receive data via I2S
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//!
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//! Pins used
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//! BCLK GPIO12
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//! WS GPIO13
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//! DIN GPIO14
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//!
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//! Without an additional I2S source device you can connect 3V3 or GND to DIN to
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//! 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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#![no_std]
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#![no_main]
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use esp32_hal::{
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clock::ClockControl,
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dma::DmaPriority,
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i2s::{DataFormat, I2s, I2s0New, I2sReadDma, NoMclk, PinsBclkWsDin, Standard},
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pdma::Dma,
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peripherals::Peripherals,
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prelude::*,
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IO,
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};
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use esp_backtrace as _;
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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 = Peripherals::take();
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let system = peripherals.SYSTEM.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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let dma = Dma::new(system.dma);
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let dma_channel = dma.i2s0channel;
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let mut tx_descriptors = [0u32; 8 * 3];
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let mut rx_descriptors = [0u32; 8 * 3];
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let i2s = I2s::new(
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peripherals.I2S0,
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NoMclk {},
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Standard::Philips,
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DataFormat::Data16Channel16,
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44100u32.Hz(),
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dma_channel.configure(
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false,
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&mut tx_descriptors,
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&mut rx_descriptors,
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DmaPriority::Priority0,
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),
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&clocks,
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);
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let i2s_rx = i2s.i2s_rx.with_pins(PinsBclkWsDin::new(
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io.pins.gpio12,
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io.pins.gpio13,
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io.pins.gpio14,
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));
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let buffer = dma_buffer();
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let mut transfer = i2s_rx.read_dma_circular(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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fn dma_buffer() -> &'static mut [u8; 4092 * 4] {
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static mut BUFFER: [u8; 4092 * 4] = [0u8; 4092 * 4];
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unsafe { &mut BUFFER }
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}
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