Add support for SX1281 on 2.4 GHz

src/mesh/SX128xInterface.h

@@ -0,0 +1,71 @@
+#pragma once
+
+#include "RadioLibInterface.h"
+
+/**
+ * \brief Adapter for SX128x radio family. Implements common logic for child classes.
+ * \tparam T RadioLib module type for SX128x: SX1281.
+ */
+template<class T>
+class SX128xInterface : public RadioLibInterface
+{
+  public:
+    SX128xInterface(RADIOLIB_PIN_TYPE cs, RADIOLIB_PIN_TYPE irq, RADIOLIB_PIN_TYPE rst, RADIOLIB_PIN_TYPE busy, SPIClass &spi);
+
+    /// Initialise the Driver transport hardware and software.
+    /// Make sure the Driver is properly configured before calling init().
+    /// \return true if initialisation succeeded.
+    virtual bool init() override;
+
+    /// Apply any radio provisioning changes
+    /// Make sure the Driver is properly configured before calling init().
+    /// \return true if initialisation succeeded.
+    virtual bool reconfigure() override;
+
+    /// Prepare hardware for sleep.  Call this _only_ for deep sleep, not needed for light sleep.
+    virtual bool sleep() override;
+
+  protected:
+
+    float currentLimit = 140; // Higher OCP limit for SX128x PA
+
+    /**
+     * Specific module instance 
+     */
+    T lora;
+
+    /**
+     * Glue functions called from ISR land
+     */
+    virtual void disableInterrupt() override;
+
+    /**
+     * Enable a particular ISR callback glue function
+     */
+    virtual void enableInterrupt(void (*callback)()) { lora.setDio1Action(callback); }
+
+    /** can we detect a LoRa preamble on the current channel? */
+    virtual bool isChannelActive() override;
+
+    /** are we actively receiving a packet (only called during receiving state) */
+    virtual bool isActivelyReceiving() override;
+
+    /**
+     * Start waiting to receive a message
+     */
+    virtual void startReceive() override;
+
+    /**
+     *  We override to turn on transmitter power as needed.
+     */
+    virtual void configHardwareForSend() override;
+
+    /**
+     * Add SNR data to received messages
+     */
+    virtual void addReceiveMetadata(MeshPacket *mp) override;
+
+    virtual void setStandby() override;
+
+  private:
+};