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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
126 lines
3.4 KiB
Rust
126 lines
3.4 KiB
Rust
//! This shows how to transmit data continously via I2S
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//!
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//! Pins used
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//! MCLK GPIO4
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//! BCLK GPIO1
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//! WS GPIO2
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//! DOUT GPIO3
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//!
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//! Without an additional I2S sink device you can inspect the MCLK, BCLK, WS and
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//! DOUT with a logic analyzer
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//!
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//! You can also connect e.g. a PCM510x to hear an annoying loud sine tone (full
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//! scale), so turn down the volume before running this example.
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//!
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//! Wiring is like this
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//!
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//! | Pin | Connected to |
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//! |-------|-----------------|
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//! | BCK | GPIO1 |
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//! | DIN | GPIO3 |
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//! | LRCK | GPIO2 |
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//! | SCK | Gnd |
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//! | GND | Gnd |
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//! | VIN | +3V3 |
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//! | FLT | Gnd |
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//! | FMT | Gnd |
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//! | DEMP | Gnd |
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//! | XSMT | +3V3 |
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#![no_std]
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#![no_main]
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use esp32c6_hal::{
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clock::ClockControl,
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dma::DmaPriority,
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gdma::Gdma,
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i2s::{DataFormat, I2s, I2s0New, I2sWriteDma, MclkPin, PinsBclkWsDout, Standard},
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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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const SINE: [i16; 64] = [
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0, 3211, 6392, 9511, 12539, 15446, 18204, 20787, 23169, 25329, 27244, 28897, 30272, 31356,
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32137, 32609, 32767, 32609, 32137, 31356, 30272, 28897, 27244, 25329, 23169, 20787, 18204,
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15446, 12539, 9511, 6392, 3211, 0, -3211, -6392, -9511, -12539, -15446, -18204, -20787, -23169,
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-25329, -27244, -28897, -30272, -31356, -32137, -32609, -32767, -32609, -32137, -31356, -30272,
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-28897, -27244, -25329, -23169, -20787, -18204, -15446, -12539, -9511, -6392, -3211,
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];
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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 = Gdma::new(peripherals.DMA);
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let dma_channel = dma.channel0;
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let mut tx_descriptors = [0u32; 20 * 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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MclkPin::new(io.pins.gpio4),
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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_tx = i2s.i2s_tx.with_pins(PinsBclkWsDout::new(
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io.pins.gpio1,
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io.pins.gpio2,
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io.pins.gpio3,
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));
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let data =
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unsafe { core::slice::from_raw_parts(&SINE as *const _ as *const u8, SINE.len() * 2) };
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let buffer = dma_buffer();
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let mut idx = 0;
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for i in 0..usize::min(data.len(), buffer.len()) {
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buffer[i] = data[idx];
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idx += 1;
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if idx >= data.len() {
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idx = 0;
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}
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}
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let mut filler = [0u8; 10000];
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let mut transfer = i2s_tx.write_dma_circular(buffer).unwrap();
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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 avail = usize::min(10000, avail);
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for bidx in 0..avail {
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filler[bidx] = data[idx];
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idx += 1;
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if idx >= data.len() {
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idx = 0;
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}
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}
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transfer.push(&filler[0..avail]).unwrap();
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}
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}
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}
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fn dma_buffer() -> &'static mut [u8; 32000] {
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static mut BUFFER: [u8; 32000] = [0u8; 32000];
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unsafe { &mut BUFFER }
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}
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