void sendBeacon(void) {
 
   
    // Initialize packet buffer of size PKTLEN + 1
    uint8 txBuffer[PKTLEN+1] = {0};
    
    packetCounterTX = 0;

    
    tx_registers();    
    
    // Connect ISR function to GPIO2
    ioPinIntRegister(&radioRxTxISR);

    // Interrupt on falling edge
    ioPinIntTypeSet(IO_PIN_FALLING_EDGE);

    // Clear ISR flag
    ioPinIntClear();

    // Enable interrupt
    ioPinIntEnable();

    // Calibrate radio according to errata
    manualCalibration();
    
    //trxSpiCmdStrobe(CC112X_SAFC); automatic frequency compensation   
      //do {   
    
      
     while(1){
    
    // Wait for button push
      
      //Continiously sent packets until button is pressed
      do{
        
        // Update packet counter
        packetCounterTX++;
        
        // Create a random packet with PKTLEN + 2 byte packet counter + n x random bytes
        createPacket(txBuffer);
        
        // Write packet to tx fifo
        cc112xSpiWriteTxFifo(txBuffer,sizeof(txBuffer));
        
        // Strobe TX to send packet
        trxSpiCmdStrobe(CC112X_STX);
        
        // Wait for interrupt that packet has been sent. 
        // (Assumes the GPIO connected to the radioRxTxISR function is set 
        // to GPIOx_CFG = 0x06)
        while(!packetSemaphore) {
          uint8 readByte;
          //Read datarate from registers
          cc112xSpiReadReg(CC112X_MARCSTATE, &readByte, 1);
          if(readByte);
        };
        
        // Clear semaphore flag
        packetSemaphore = ISR_IDLE;

        rssi = Read8BitRssi();
              
        write_tx();
        
      }while(!SW_PUSH);
    
  }
  // Put radio to sleep and exit application
  //trxSpiCmdStrobe(CC112X_SPWD);  
}


uint8 Read8BitRssi(void){
 uint8 rssi2compl,rssiValid;
 uint8 rssiOffset = 102;
 int8 rssiConverted;
 //Read RSSI_VALID from RSSI0
 cc112xSpiReadReg(CC112X_RSSI0, &rssiValid, 1);
 // Check if the RSSI_VALID flag is set
 if(rssiValid & 0x01){
 // Read RSSI from MSB register
 cc112xSpiReadReg(CC112X_RSSI1, &rssi2compl, 1);
 rssiConverted = (int8)rssi2compl - rssiOffset;
 return rssiConverted;
 }
 // return 0 since new value is not valid
 return 0;
}

static void tx_registers(void) {
 
    uint8 writeByte;       

    registerConfig();
    //RX Gain
    writeByte = 0x04; cc112xSpiWriteReg(CC112X_CHAN_BW, &writeByte, 1);  // RX filter bandwidth 200kHz
    writeByte = 0x11; cc112xSpiWriteReg(CC112X_AGC_CFG3, &writeByte, 1); //adjust min gain 
    writeByte = 0x20; cc112xSpiWriteReg(CC112X_AGC_CFG2, &writeByte, 1); //0x20-->max gain 0xA0-->previous gain
    writeByte = 0x19; cc112xSpiWriteReg(CC112X_AGC_REF, &writeByte, 1);  //0x19
     
    //TX Power
    writeByte = 0x7F; cc112xSpiWriteReg(CC112X_PA_CFG2, &writeByte, 1);
    writeByte = 0x56; cc112xSpiWriteReg(CC112X_PA_CFG1, &writeByte, 1);
    writeByte = 0x7C; cc112xSpiWriteReg(CC112X_PA_CFG0, &writeByte, 1);
    
    // TXOFF_MODE = RX
    writeByte = 0x38; cc112xSpiWriteReg(CC112X_RFEND_CFG0, &writeByte, 1); 
    
    // RXOFF_MODE = RX
    writeByte = 0x3F; cc112xSpiWriteReg(CC112X_RFEND_CFG1, &writeByte, 1); 
    
    // Max packet length = 2
    writeByte = 0x02; cc112xSpiWriteReg(CC112X_PKT_LEN, &writeByte, 1);  //auto ack. paketi --> Length + Address of transmitter + Address of receiver     
      
}