Add ability to set Datarate

Firmware/lib/LoRaWAN/LoRaWAN.cpp

@@ -35,7 +35,7 @@ void LoRaWAN::setKeys(unsigned char NwkSkey[], unsigned char AppSkey[], unsigned
 *
 *****************************************************************************************
 */
-void LoRaWAN::Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned int Frame_Counter_Tx)
+void LoRaWAN::Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned int Frame_Counter_Tx, lora_dr_t datarate)
 {
   //Define variables
   unsigned char i;
@@ -66,7 +66,6 @@ void LoRaWAN::Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned
     111	(0xE0) Proprietary
   */
 
-
   // Unconfirmed data up
   unsigned char Mac_Header = 0x40;
 
@@ -79,7 +78,6 @@ void LoRaWAN::Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned
   //Encrypt the data
   Encrypt_Payload(Data, Data_Length, Frame_Counter_Tx, Direction);
 
-
   //Build the Radio Package
   RFM_Data[0] = Mac_Header;
 
@@ -119,13 +117,12 @@ void LoRaWAN::Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned
   //Add MIC length to RFM package length
   RFM_Package_Length = RFM_Package_Length + 4;
 
+  //Set Lora Datarate
+  _rfm95->RFM_Set_Datarate(datarate);
   //Send Package
   _rfm95->RFM_Send_Package(RFM_Data, RFM_Package_Length);
 }
 
-
-
-
 /*
    Encryption stuff after this line
 */

Firmware/lib/LoRaWAN/LoRaWAN.h

@@ -40,7 +40,7 @@ class LoRaWAN
   public:
     LoRaWAN(RFM95 &rfm95);
     void setKeys(unsigned char NwkSkey[], unsigned char AppSkey[], unsigned char DevAddr[]);
-    void Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned int Frame_Counter_Tx);
+    void Send_Data(unsigned char *Data, unsigned char Data_Length, unsigned int Frame_Counter_Tx, lora_dr_t datarate);
 
   private:
     RFM95 *_rfm95;

Firmware/lib/RFM95/RFM95.cpp

@@ -33,6 +33,11 @@ void RFM95::init()
   pinMode(_NSS, OUTPUT);
   pinMode(_DIO0, INPUT);
 
+  // Set default Datarate Config SF7BW125
+  _sf = 0x74;
+  _bw = 0x72;
+  _mc = 0x04;
+  
   // NSS for starting and stopping communication with the RFM95 module
   digitalWrite(_NSS, HIGH);
 
@@ -147,6 +152,59 @@ unsigned char RFM95::RFM_Read(unsigned char RFM_Address)
   return RFM_Data;
 }
 
+/*
+*****************************************************************************************
+* Description : Set Datarate and Spreading Factor
+*
+* Arguments   : datarate  Lora Datarate Enum (see RFM95.h)
+*****************************************************************************************
+*/
+
+void RFM95::RFM_Set_Datarate(lora_dr_t datarate) {
+  switch(datarate) {
+    case SF7BW125:
+      _sf = 0x74;
+      _bw = 0x72;
+      _mc = 0x04;
+      break;
+    case SF7BW250:
+      _sf = 0x74;
+      _bw = 0x82;
+      _mc = 0x04;
+      break;
+    case SF8BW125:
+      _sf = 0x84;
+      _bw = 0x72;
+      _mc = 0x04;
+      break;
+    case SF9BW125:
+      _sf = 0x94;
+      _bw = 0x72;
+      _mc = 0x04;
+      break;
+    case SF10BW125:
+      _sf = 0xA4;
+      _bw = 0x72;
+      _mc = 0x04;
+      break;
+    case SF11BW125:
+      _sf = 0xB4;
+      _bw = 0x72;
+      _mc = 0x0C;
+      break;
+    case SF12BW125:
+      _sf = 0xC4;
+      _bw = 0x72;
+      _mc = 0x0C;
+      break;
+    default:
+      _sf = 0x74;
+      _bw = 0x72;
+      _mc = 0x04;
+      break;
+  }
+}
+
 /*
 *****************************************************************************************
 * Description : Function for sending a package with the RFM
@@ -236,9 +294,9 @@ void RFM95::RFM_Send_Package(unsigned char *RFM_Tx_Package, unsigned char Packag
 
 
   //SF7 BW 125 kHz
-  RFM_Write(0x1E,0x74); //SF7 CRC On
+  RFM_Write(0x1E,_sf); //SF7 CRC On
-  RFM_Write(0x1D,0x72); //125 kHz 4/5 coding rate explicit header mode
+  RFM_Write(0x1D,_bw); //125 kHz 4/5 coding rate explicit header mode
-  RFM_Write(0x26,0x04); //Low datarate optimization off AGC auto on
+  RFM_Write(0x26,_mc); //Low datarate optimization off AGC auto on
 
   //Set IQ to normal values
   RFM_Write(0x33,0x27);

Firmware/lib/RFM95/RFM95.h

@@ -12,6 +12,17 @@
 
 #include "Arduino.h"
 
+typedef enum lora_dr
+{
+  SF7BW125,
+  SF7BW250,
+  SF8BW125,
+  SF9BW125,
+  SF10BW125,
+  SF11BW125,
+  SF12BW125,
+} lora_dr_t;
+
 class RFM95
 {
   public:
@@ -20,9 +31,11 @@ class RFM95
     void RFM_Write(unsigned char RFM_Address, unsigned char RFM_Data);
     unsigned char RFM_Read(unsigned char RFM_Address);
     void RFM_Send_Package(unsigned char *RFM_Tx_Package, unsigned char Package_Length);
+    void RFM_Set_Datarate(lora_dr_t datarate);
   private:
     int _DIO0;
     int _NSS;
+    unsigned char _sf, _bw, _mc;
 };
 
 

Firmware/src/main.cpp

@@ -66,6 +66,7 @@
 // Global Variable used for deep sleep
 uint16_t sleep_interval;
 
+#ifdef LED_PIN
 void blink(uint8_t num) {
   pinMode(LED_PIN, OUTPUT);
   digitalWrite(LED_PIN, 0);
@@ -75,6 +76,7 @@ void blink(uint8_t num) {
   }
   digitalWrite(LED_PIN, 0);
 }
+#endif
 
 // Setup Wakeup Interrupt Timer
 void init_wdt()
@@ -158,8 +160,10 @@ void setup()
 void loop()
 {
   // Without Sensor (Beacon Mode) just send the Battery Voltage
+  // Use less acurate Battery Voltage Reading (100mv Steps) to be
+  // Compatible with IOT-Usergroup Basenodes 
   #ifdef HAS_NO_SENSOR
-    int32_t data[1];
+    uint8_t data[1];
   #endif
 
   // Get Sensor Data
@@ -175,7 +179,7 @@ void loop()
   #endif
   
   #ifdef HAS_NO_SENSOR
-    data[0] = readVcc();
+    data[0] = (uint8_t)(readVcc()/20);
   #else
     data[3] = readVcc();
   #endif
@@ -187,7 +191,7 @@ void loop()
   
   #ifdef RF_LORA
     // Send LoRa Packet, Increment Frame Counter
-    lora.Send_Data((unsigned char *)data, sizeof(data), Frame_Counter_Tx);
+    lora.Send_Data((unsigned char *)data, sizeof(data), Frame_Counter_Tx, SF7BW125);
     Frame_Counter_Tx++;
   #endif