93 lines
2.2 KiB
Rust
93 lines
2.2 KiB
Rust
//! This shows using Parallel IO to output 4 bit parallel data at 1MHz clock
|
|
//! rate.
|
|
//!
|
|
//! Uses GPIO 1, 2, 3 and 4 as the data pins.
|
|
//! GPIO 5 as the "valid pin" (driven high during an active transfer) and GPIO
|
|
//! 6 as the clock signal output.
|
|
//!
|
|
//! You can use a logic analyzer to see how the pins are used.
|
|
|
|
//% CHIPS: esp32c6 esp32h2
|
|
|
|
#![no_std]
|
|
#![no_main]
|
|
|
|
use esp_backtrace as _;
|
|
use esp_hal::{
|
|
clock::ClockControl,
|
|
delay::Delay,
|
|
dma::{Dma, DmaPriority},
|
|
dma_buffers,
|
|
gpio::IO,
|
|
parl_io::{
|
|
BitPackOrder,
|
|
ClkOutPin,
|
|
ParlIoTxOnly,
|
|
SampleEdge,
|
|
TxFourBits,
|
|
TxPinConfigWithValidPin,
|
|
},
|
|
peripherals::Peripherals,
|
|
prelude::*,
|
|
};
|
|
use esp_println::println;
|
|
|
|
#[entry]
|
|
fn main() -> ! {
|
|
let peripherals = Peripherals::take();
|
|
let system = peripherals.SYSTEM.split();
|
|
let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
|
|
|
|
let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
|
|
|
|
let (tx_buffer, mut tx_descriptors, _, mut rx_descriptors) = dma_buffers!(32000, 0);
|
|
|
|
let dma = Dma::new(peripherals.DMA);
|
|
let dma_channel = dma.channel0;
|
|
|
|
let tx_pins = TxFourBits::new(io.pins.gpio1, io.pins.gpio2, io.pins.gpio3, io.pins.gpio4);
|
|
|
|
let pin_conf = TxPinConfigWithValidPin::new(tx_pins, io.pins.gpio5);
|
|
|
|
let parl_io = ParlIoTxOnly::new(
|
|
peripherals.PARL_IO,
|
|
dma_channel.configure(
|
|
false,
|
|
&mut tx_descriptors,
|
|
&mut rx_descriptors,
|
|
DmaPriority::Priority0,
|
|
),
|
|
1.MHz(),
|
|
&clocks,
|
|
)
|
|
.unwrap();
|
|
|
|
let clock_pin = ClkOutPin::new(io.pins.gpio6);
|
|
|
|
let mut parl_io_tx = parl_io
|
|
.tx
|
|
.with_config(
|
|
pin_conf,
|
|
clock_pin,
|
|
0,
|
|
SampleEdge::Normal,
|
|
BitPackOrder::Msb,
|
|
)
|
|
.unwrap();
|
|
|
|
let buffer = tx_buffer;
|
|
for i in 0..buffer.len() {
|
|
buffer[i] = (i % 255) as u8;
|
|
}
|
|
|
|
let delay = Delay::new(&clocks);
|
|
|
|
loop {
|
|
let transfer = parl_io_tx.write_dma(&buffer).unwrap();
|
|
transfer.wait().unwrap();
|
|
println!("Transferred {} bytes", buffer.len());
|
|
|
|
delay.delay_millis(500);
|
|
}
|
|
}
|