48e3e912f3
* Extract embassy support into `esp-hal-embassy` package * Update relevant packages/examples/tests to get CI green again * Add back `defmt` support * Re-export `Executor` and `InterruptExecutor` rather than making `executor` module public * Document the `esp-hal-embassy` package * Update `CHANGELOG.md` * Hack together a "fix" for the `SYSTIMER` time driver * Make `clippy` shut up
98 lines
2.5 KiB
Rust
98 lines
2.5 KiB
Rust
//! This shows using Parallel IO to output 4 bit parallel data at 1MHz clock
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//! rate.
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//!
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//! Uses GPIO 1, 2, 3 and 4 as the data pins.
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//! GPIO 5 as the "valid pin" (driven high during an active transfer) and GPIO
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//! 8 as the clock signal output.
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//!
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//! You can use a logic analyzer to see how the pins are used.
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//% CHIPS: esp32c6 esp32h2
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//% FEATURES: async embassy embassy-time-timg0 embassy-generic-timers
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#![no_std]
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#![no_main]
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use embassy_executor::Spawner;
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use embassy_time::{Duration, Timer};
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use esp_backtrace as _;
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use esp_hal::{
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clock::ClockControl,
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dma::{Dma, DmaPriority},
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dma_buffers,
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gpio::Io,
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parl_io::{
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BitPackOrder,
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ClkOutPin,
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ParlIoTxOnly,
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SampleEdge,
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TxFourBits,
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TxPinConfigWithValidPin,
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},
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peripherals::Peripherals,
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prelude::*,
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system::SystemControl,
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timer::timg::TimerGroup,
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};
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use esp_println::println;
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#[main]
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async fn main(_spawner: Spawner) {
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esp_println::println!("Init!");
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let peripherals = Peripherals::take();
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let system = SystemControl::new(peripherals.SYSTEM);
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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let timg0 = TimerGroup::new_async(peripherals.TIMG0, &clocks);
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esp_hal_embassy::init(&clocks, timg0);
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let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
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let (tx_buffer, mut tx_descriptors, _, mut rx_descriptors) = dma_buffers!(32000, 0);
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let dma = Dma::new(peripherals.DMA);
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let dma_channel = dma.channel0;
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let tx_pins = TxFourBits::new(io.pins.gpio1, io.pins.gpio2, io.pins.gpio3, io.pins.gpio4);
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let mut pin_conf = TxPinConfigWithValidPin::new(tx_pins, io.pins.gpio5);
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let parl_io = ParlIoTxOnly::new(
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peripherals.PARL_IO,
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dma_channel.configure_for_async(
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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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1.MHz(),
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&clocks,
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)
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.unwrap();
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let mut clock_pin = ClkOutPin::new(io.pins.gpio8);
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let mut parl_io_tx = parl_io
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.tx
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.with_config(
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&mut pin_conf,
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&mut clock_pin,
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0,
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SampleEdge::Normal,
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BitPackOrder::Msb,
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)
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.unwrap();
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let buffer = tx_buffer;
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for i in 0..buffer.len() {
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buffer[i] = (i % 255) as u8;
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}
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loop {
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parl_io_tx.write_dma_async(buffer).await.unwrap();
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println!("Transferred {} bytes", buffer.len());
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Timer::after(Duration::from_millis(500)).await;
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}
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}
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