Add lora-phy examples.

examples/stm32wl/src/bin/lora_p2p_send.rs

@@ -23,6 +23,8 @@ 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 mut config = embassy_stm32::Config::default();
@@ -58,7 +60,12 @@ async fn main(_spawner: Spawner) {
     };
 
     let mdltn_params = {
-        match lora.create_modulation_params(SpreadingFactor::_10, Bandwidth::_250KHz, CodingRate::_4_8, 903900000) {
+        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);