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//! This example runs on the STM32 LoRa Discovery board, which has a builtin Semtech Sx1276 radio.
//! It demonstrates LORA P2P CAD functionality.
#![no_std]
#![no_main]
#![macro_use]
#![feature(type_alias_impl_trait)]
use defmt::*;
use embassy_executor::Spawner;
use embassy_lora::iv::Stm32l0InterfaceVariant;
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 lora_phy::mod_params::*;
use lora_phy::sx1276_7_8_9::SX1276_7_8_9;
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 mut config = embassy_stm32::Config::default();
config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSI16;
config.rcc.enable_hsi48 = true;
let p = embassy_stm32::init(config);
let mut spi_config = spi::Config::default();
spi_config.frequency = khz(200);
// SPI for sx1276
let spi = spi::Spi::new(p.SPI1, p.PB3, p.PA7, p.PA6, p.DMA1_CH3, p.DMA1_CH2, spi_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 iv = Stm32l0InterfaceVariant::new(nss, reset, irq, None, None).unwrap();
let mut lora = {
match LoRa::new(SX1276_7_8_9::new(BoardType::Stm32l0Sx1276, spi, iv), false, Delay).await {
Ok(l) => l,
Err(err) => {
info!("Radio error = {}", err);
return;
}
}
};
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 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;
}
}
};
match lora.prepare_for_cad(&mdltn_params, true).await {
Ok(()) => {}
Err(err) => {
info!("Radio error = {}", err);
return;
}
};
match lora.cad().await {
Ok(cad_activity_detected) => {
if cad_activity_detected {
info!("cad successful with activity detected")
} else {
info!("cad successful without activity detected")
}
debug_indicator.set_high();
Timer::after_secs(5).await;
debug_indicator.set_low();
}
Err(err) => info!("cad unsuccessful = {}", err),
}
}
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