embassy/examples/rp/src/bin/lora_p2p_receive.rs

//! This example runs on the Raspberry Pi Pico with a Waveshare board containing a Semtech Sx1262 radio.
//! It demonstrates LORA P2P receive functionality in conjunction with the lora_p2p_send example.

#![no_std]
#![no_main]
#![macro_use]
#![feature(type_alias_impl_trait)]

use defmt::*;
use embassy_executor::Spawner;
use embassy_lora::iv::GenericSx126xInterfaceVariant;
use embassy_rp::gpio::{Input, Level, Output, Pin, Pull};
use embassy_rp::spi::{Config, Spi};
use embassy_time::{Delay, Timer};
use lora_phy::mod_params::*;
use lora_phy::sx1261_2::SX1261_2;
use lora_phy::LoRa;
use {defmt_rtt as _, panic_probe as _};

const LORA_FREQUENCY_IN_HZ: u32 = 903_900_000; // warning: set this appropriately for the region

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_rp::init(Default::default());

    let miso = p.PIN_12;
    let mosi = p.PIN_11;
    let clk = p.PIN_10;
    let spi = Spi::new(p.SPI1, clk, mosi, miso, p.DMA_CH0, p.DMA_CH1, Config::default());

    let nss = Output::new(p.PIN_3.degrade(), Level::High);
    let reset = Output::new(p.PIN_15.degrade(), Level::High);
    let dio1 = Input::new(p.PIN_20.degrade(), Pull::None);
    let busy = Input::new(p.PIN_2.degrade(), Pull::None);

    let iv = GenericSx126xInterfaceVariant::new(nss, reset, dio1, busy, None, None).unwrap();

    let mut lora = {
        match LoRa::new(SX1261_2::new(BoardType::RpPicoWaveshareSx1262, spi, iv), false, Delay).await {
            Ok(l) => l,
            Err(err) => {
                info!("Radio error = {}", err);
                return;
            }
        }
    };

    let mut debug_indicator = Output::new(p.PIN_25, Level::Low);

    let mut receiving_buffer = [00u8; 100];

    let mdltn_params = {
        match lora.create_modulation_params(
            SpreadingFactor::_10,
            Bandwidth::_250KHz,
            CodingRate::_4_8,
            LORA_FREQUENCY_IN_HZ,
        ) {
            Ok(mp) => mp,
            Err(err) => {
                info!("Radio error = {}", err);
                return;
            }
        }
    };

    let rx_pkt_params = {
        match lora.create_rx_packet_params(4, false, receiving_buffer.len() as u8, true, false, &mdltn_params) {
            Ok(pp) => pp,
            Err(err) => {
                info!("Radio error = {}", err);
                return;
            }
        }
    };

    match lora
        .prepare_for_rx(&mdltn_params, &rx_pkt_params, None, None, false)
        .await
    {
        Ok(()) => {}
        Err(err) => {
            info!("Radio error = {}", err);
            return;
        }
    };

    loop {
        receiving_buffer = [00u8; 100];
        match lora.rx(&rx_pkt_params, &mut receiving_buffer).await {
            Ok((received_len, _rx_pkt_status)) => {
                if (received_len == 3)
                    && (receiving_buffer[0] == 0x01u8)
                    && (receiving_buffer[1] == 0x02u8)
                    && (receiving_buffer[2] == 0x03u8)
                {
                    info!("rx successful");
                    debug_indicator.set_high();
                    Timer::after_secs(5).await;
                    debug_indicator.set_low();
                } else {
                    info!("rx unknown packet");
                }
            }
            Err(err) => info!("rx unsuccessful = {}", err),
        }
    }
}