Add a function to activate CW mode (#16)

Signed-off-by: Albertas Mickėnas <albertas@technarium.lt>
Co-authored-by: Frederic Pillon <frederic.pillon@st.com>

Author: Miceuz

src/STM32LoRaWAN.cpp

@@ -124,6 +124,20 @@ void STM32LoRaWAN::maintainUntilIdle()
   } while(busy());
 }
 
+bool STM32LoRaWAN::continuousWave(uint32_t frequency, int8_t powerdBm,
+                                  uint16_t timeout) {
+  MlmeReq_t mlmeReq;
+  mlmeReq.Type = MLME_TXCW_1;
+  mlmeReq.Req.TxCw.Frequency = frequency;
+  mlmeReq.Req.TxCw.Power = powerdBm;
+  mlmeReq.Req.TxCw.Timeout = timeout;
+  LoRaMacStatus_t res = LoRaMacMlmeRequest(&mlmeReq);
+  if (res != LORAMAC_STATUS_OK)
+    return failure("Failed to enable CW mode: %s\r\n", toString(res));
+
+  return true;
+}
+
 bool STM32LoRaWAN::joinOTAAAsync()
 {
   clear_rx();

src/STM32LoRaWAN.h

@@ -791,6 +791,19 @@ class STM32LoRaWAN : public Stream {
 
     /// @}
 
+    /**
+     * Set the radio into continuous wave (CW) mode. In this mode radio outputs
+     * a signal at the specified frequency and power for the specified duration. 
+     * 
+     * Used only for compliance testing and antenna testing.
+     *
+     * \param frequency Frequency in Hz.
+     * \param powerdBm transmit power in dBm.
+     * \param timeout Duration in seconds.
+     * \returns true if CW mode was activated successfully.
+     */
+
+    bool continuousWave(uint32_t frequency, int8_t powerdBm, uint16_t timeout);
 
     /**
      * @name Dummy implementations