[SX128x] Add LoRa Rx header infos method

src/modules/SX128x/SX128x.cpp

@@ -1286,6 +1286,20 @@ size_t SX128x::getPacketLength(bool update, uint8_t* offset) {
   return((size_t)rxBufStatus[0]);
 }
 
+int16_t SX128x::getLoRaRxHeaderInfo(uint8_t* cr, bool* hasCRC) {
+  int16_t state = RADIOLIB_ERR_NONE;
+
+  // check if in explicit header mode
+  if(this->headerType == RADIOLIB_SX128X_LORA_HEADER_IMPLICIT) {
+    return(RADIOLIB_ERR_WRONG_MODEM);
+  }
+
+  if(cr) { *cr = this->mod->SPIgetRegValue(RADIOLIB_SX128X_REG_LORA_RX_CODING_RATE, 6, 4) >> 4; }
+  if(hasCRC) { *hasCRC = (this->mod->SPIgetRegValue(RADIOLIB_SX128X_REG_FEI_MSB, 4, 4) != 0); }
+
+  return(state);
+}
+
 int16_t SX128x::fixedPacketLengthMode(uint8_t len) {
   return(setPacketMode(RADIOLIB_SX128X_GFSK_FLRC_PACKET_FIXED, len));
 }

src/modules/SX128x/SX128x.h

@@ -84,6 +84,7 @@
 #define RADIOLIB_SX128X_REG_FREQ_ERROR_CORRECTION               0x093C
 #define RADIOLIB_SX128X_REG_LORA_SYNC_WORD_MSB                  0x0944
 #define RADIOLIB_SX128X_REG_LORA_SYNC_WORD_LSB                  0x0945
+#define RADIOLIB_SX128X_REG_LORA_RX_CODING_RATE                 0x0950
 #define RADIOLIB_SX128X_REG_RANGING_FILTER_RSSI_OFFSET          0x0953
 #define RADIOLIB_SX128X_REG_FEI_MSB                             0x0954
 #define RADIOLIB_SX128X_REG_FEI_MID                             0x0955
@@ -795,6 +796,14 @@ class SX128x: public PhysicalLayer {
     */
     size_t getPacketLength(bool update, uint8_t* offset);
 
+    /*!
+      \brief Get LoRa header information from last received packet. Only valid in explicit header mode.
+      \param cr Pointer to variable to store the coding rate.
+      \param hasCRC Pointer to variable to store the CRC status.
+      \returns \ref status_codes
+    */
+    int16_t getLoRaRxHeaderInfo(uint8_t* cr, bool* hasCRC);
+
     /*!
       \brief Set modem in fixed packet length mode. Available in GFSK mode only.
       \param len Packet length.