// *********************************************************************
// *                           E03 - TR                                *
// *                        RF transceiver                             *
// *********************************************************************
// Example of RF transmitter/receiver. Suitable for a PC link.
//
// Intended for:
//   HW: - (DC)TR-72D + CK-USB-04x development kit
//
//   OS: - v4.06D
//  
// Description:
//   - This program applied in two kits is a bidirectional RF-SPI interface.
//   - Received RF data is sent via SPI and vice versa. For sending and
//     receiving SPI data e.g. the IQRF IDE Terminal can be used
//     (See IQRF IDE Help).
//   - Received SPI data is sent via RF.
//   - PIN should be updated in case of bidirectional RF communication
//     before every RF transmission.
//
// ---------------------------------------------------------------------
// Online IQRF OS Reference Guide: https://doc.iqrf.org/IQRF-OS-Reference-guide
//
// Copyright (c) IQRF Tech s.r.o.
//
// File:    E03-TR.c
// Version: v2.08                                   Revision: 07/01/2022
//
// Revision history:
//   v2.08: 07/01/2022  Tested for OS 4.06D.
//   v2.07: 30/06/2021  Tested for OS 4.05D.
//   v2.06: 26/08/2020  Tested for OS 4.04D.
//   v2.05: 21/09/2018  Tested for OS 4.03D.
//   v2.04: 23/08/2017  Tested for OS 4.02D.
//   v2.02: 03/03/2017  Tested for OS 4.00D.
//                      Preamble quality test added.
//   v2.01: 22/02/2016  Tested for OS 3.08D.
//   v2.00: 02/07/2015  First release for (DC)TR-7xD.
//
// *********************************************************************
#include "IQRF.h"  // System header files

// *********************************************************************
#define RX_FILTER               5

// *********************************************************************
void APPLICATION()
{
    enableSPI();                     
    setRFmode(_WPE | _RX_STD | _TX_STD);
    _checkRFcfg_PQT = 1;            // Enable preamble quality test
    toutRF = 1;                     // Wait Packed End active so the toutRF can be set to minimum
   
    while (1)                       // Main cycle (perpetually repeated)
    {
        if (checkRF(RX_FILTER))     // RF signal detection (takes cca 1ms)
        {
            if (RFRXpacket())       // If anything was received
            {
                pulseLEDR();        // LED indication
                copyBufferRF2COM(); // Copy received RF data from bufferRF to bufferCOM
                startSPI(DLEN);     //  and send it via SPI
            }
        }
        
        if (getStatusSPI())         // Update SPIstatus, check SPI busy
                                    // SPIpacketLength: data length
             continue;              // Wait until message is picked up
            
        if (_SPIRX)                 // Anything received?
        {                           // Yes:
            if (_SPICRCok)          // CRCM matched?
            {                       // Yes:
                DLEN = SPIpacketLength;
                copyBufferCOM2RF(); // Copy received SPI data from bufferCOM to bufferRF
                PIN = 0;
                RFTXpacket();
                pulseLEDG();        // LED indication
            }

            startSPI(0);            // Restart SPI communication
        }
    }
}

// *********************************************************************