69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
//! This shows how to configure UART
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//! You can short the TX and RX pin and see it reads what was written.
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//! Additionally you can connect a logic analzyer to TX and see how the changes
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//! of the configuration change the output signal.
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//!
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//! The following wiring is assumed:
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//! - TX => GPIO4
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//! - RX => GPIO5
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//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
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//% FEATURES: embedded-hal-02
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#![no_std]
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#![no_main]
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use embedded_hal_02::serial::{Read, Write};
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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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delay::Delay,
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gpio::IO,
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peripherals::Peripherals,
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prelude::*,
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uart::{
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config::{Config, DataBits, Parity, StopBits},
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TxRxPins,
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Uart,
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},
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};
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use esp_println::println;
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use nb::block;
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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 config = Config {
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baudrate: 115200,
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data_bits: DataBits::DataBits8,
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parity: Parity::ParityNone,
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stop_bits: StopBits::STOP1,
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};
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let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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let pins = TxRxPins::new_tx_rx(
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io.pins.gpio4.into_push_pull_output(),
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io.pins.gpio5.into_floating_input(),
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);
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let mut serial1 = Uart::new_with_config(peripherals.UART1, config, Some(pins), &clocks);
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let delay = Delay::new(&clocks);
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println!("Start");
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loop {
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serial1.write(0x42).ok();
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let read = block!(serial1.read());
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match read {
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Ok(read) => println!("Read 0x{:02x}", read),
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Err(err) => println!("Error {:?}", err),
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}
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delay.delay_millis(250);
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}
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}
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