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lora_p2p_receive_duty_cycle.rs
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lora_p2p_receive_duty_cycle.rs
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//! This example runs on the RAK4631 WisBlock, which has an nRF52840 MCU and Semtech Sx126x radio.
//! Other nrf/sx126x combinations may work with appropriate pin modifications.
//! It demonstrates LoRa Rx duty cycle functionality in conjunction with the lora_p2p_send example.
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_nrf::gpio::{Input, Level, Output, OutputDrive, Pin as _, Pull};
use embassy_nrf::{bind_interrupts, peripherals, spim};
use embassy_time::{Delay, Timer};
use embedded_hal_bus::spi::ExclusiveDevice;
use lora_phy::iv::GenericSx126xInterfaceVariant;
use lora_phy::sx126x::{Sx126x, Sx126xVariant, TcxoCtrlVoltage};
use lora_phy::{mod_params::*, sx126x};
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
bind_interrupts!(struct Irqs {
SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1 => spim::InterruptHandler<peripherals::TWISPI1>;
});
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_nrf::init(Default::default());
let nss = Output::new(p.P1_10.degrade(), Level::High, OutputDrive::Standard);
let reset = Output::new(p.P1_06.degrade(), Level::High, OutputDrive::Standard);
let dio1 = Input::new(p.P1_15.degrade(), Pull::Down);
let busy = Input::new(p.P1_14.degrade(), Pull::Down);
let rf_switch_rx = Output::new(p.P1_05.degrade(), Level::Low, OutputDrive::Standard);
let rf_switch_tx = Output::new(p.P1_07.degrade(), Level::Low, OutputDrive::Standard);
let mut spi_config = spim::Config::default();
spi_config.frequency = spim::Frequency::M16;
let spim = spim::Spim::new(p.TWISPI1, Irqs, p.P1_11, p.P1_13, p.P1_12, spi_config);
let spi = ExclusiveDevice::new(spim, nss, Delay);
let config = sx126x::Config {
chip: Sx126xVariant::Sx1262,
tcxo_ctrl: Some(TcxoCtrlVoltage::Ctrl1V7),
use_dcdc: true,
use_dio2_as_rfswitch: true,
};
let iv = GenericSx126xInterfaceVariant::new(reset, dio1, busy, Some(rf_switch_rx), Some(rf_switch_tx)).unwrap();
let mut lora = LoRa::new(Sx126x::new(spi, iv, config), false, Delay).await.unwrap();
let mut debug_indicator = Output::new(p.P1_03, Level::Low, OutputDrive::Standard);
let mut start_indicator = Output::new(p.P1_04, Level::Low, OutputDrive::Standard);
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;
}
}
};
// See "RM0453 Reference manual STM32WL5x advanced Arm®-based 32-bit MCUs with sub-GHz radio solution" for the best explanation of Rx duty cycle processing.
match lora
.prepare_for_rx(
RxMode::DutyCycle(DutyCycleParams {
rx_time: 300_000, // 300_000 units * 15.625 us/unit = 4.69 s
sleep_time: 200_000, // 200_000 units * 15.625 us/unit = 3.13 s
}),
&mdltn_params,
&rx_pkt_params,
false,
)
.await
{
Ok(()) => {}
Err(err) => {
info!("Radio error = {}", err);
return;
}
};
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),
}
}