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lora_p2p_receive.rs
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lora_p2p_receive.rs
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//! This example runs on the STM32 LoRa Discovery board, which has a builtin Semtech Sx1276 radio.
//! It demonstrates LORA P2P receive functionality in conjunction with the lora_p2p_send example.
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::exti::{Channel, ExtiInput};
use embassy_stm32::gpio::{Input, Level, Output, Pin, Pull, Speed};
use embassy_stm32::spi;
use embassy_stm32::time::khz;
use embassy_time::{Delay, Timer};
use embedded_hal_bus::spi::ExclusiveDevice;
use lora_phy::iv::GenericSx127xInterfaceVariant;
use lora_phy::sx127x::{Sx127x, Sx1276};
use lora_phy::{mod_params::*, sx127x};
use lora_phy::{LoRa, RxMode};
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 mut config = embassy_stm32::Config::default();
config.rcc.hsi = true;
config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSI;
let p = embassy_stm32::init(config);
let nss = Output::new(p.PA15.degrade(), Level::High, Speed::Low);
let reset = Output::new(p.PC0.degrade(), Level::High, Speed::Low);
let irq_pin = Input::new(p.PB4.degrade(), Pull::Up);
let irq = ExtiInput::new(irq_pin, p.EXTI4.degrade());
let mut spi_config = spi::Config::default();
spi_config.frequency = khz(200);
let spi = spi::Spi::new(p.SPI1, p.PB3, p.PA7, p.PA6, p.DMA1_CH3, p.DMA1_CH2, spi_config);
let spi = ExclusiveDevice::new(spi, nss, Delay);
let config = sx127x::Config {
chip: Sx1276,
tcxo_used: true,
rx_boost: false,
tx_boost: false,
};
let iv = GenericSx127xInterfaceVariant::new(reset, irq, None, None).unwrap();
let mut lora = LoRa::new(Sx127x::new(spi, iv, config), false, Delay).await.unwrap();
let mut debug_indicator = Output::new(p.PB5, Level::Low, Speed::Low);
let mut start_indicator = Output::new(p.PB6, Level::Low, Speed::Low);
start_indicator.set_high();
Timer::after_secs(5).await;
start_indicator.set_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(RxMode::Continuous, &mdltn_params, &rx_pkt_params)
.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),
}
}
}