1 // ********************************************************************* 2 // Custom DPA Handler code example - Peer-to-peer receiver * 3 // ********************************************************************* 4 // Copyright (c) IQRF Tech s.r.o. 5 // 6 // File: $RCSfile: CustomDpaHandler-Peer-to-Peer.c,v $ 7 // Version: $Revision: 1.16 $ 8 // Date: $Date: 2017/08/09 12:24:47 $ 9 // 10 // Revision history: 11 // 2017/03/13 Release for DPA 3.00 12 // 2015/08/05 Release for DPA 2.20 13 // 14 // ********************************************************************* 15 16 // Online DPA documentation http://www.iqrf.org/DpaTechGuide/ 17 18 // Default IQRF include (modify the path according to your setup) 19 #include "IQRF.h" 20 21 // Uncomment to compile Custom DPA Handler for Coordinator 22 //#define COORDINATOR_CUSTOM_HANDLER 23 24 // Default DPA header (modify the path according to your setup) 25 #include "DPA.h" 26 // Default Custom DPA Handler header (modify the path according to your setup) 27 #include "DPAcustomHandler.h" 28 29 // This example receives peer-to-peer packets sent from Peer-to-Peer-Transmitter.c example using build-in DPA support of peer-to-peer packets (event DpaEvent_PeerToPeer). 30 // The example also shows fully user programmed implementation of peer-to-peer packet at the different channel (event DpaEvent_Idle). This approach requires more code but avoids radio jamming of the main network traffic. 31 // !!! It is highly recommended to use additional security techniques (e.g. encryption, rolling code, checksum, CRC) against packet sniffing, spoofing and eavesdropping. 32 // !!! It is also recommended to use listen-before-talk technique to minimize the risk of RF collision that might cause the main network RF traffic to fail. 33 34 void HandlerPeer2PeerPacket(); 35 36 // Must be the 1st defined function in the source code in order to be placed at the correct FLASH location! 37 //############################################################################################ 38 bit CustomDpaHandler() 39 //############################################################################################ 40 { 41 // Handler presence mark 42 clrwdt(); 43 44 // Detect DPA event to handle 45 switch ( GetDpaEvent() ) 46 { 47 #ifdef DpaEvent_Interrupt 48 // ------------------------------------------------- 49 case DpaEvent_Interrupt: 50 // Do an extra quick background interrupt work 51 // ! The time spent handling this event is critical.If there is no interrupt to handle return immediately otherwise keep the code as fast as possible. 52 // ! Make sure the event is the 1st case in the main switch statement at the handler routine.This ensures that the event is handled as the 1st one. 53 // ! It is desirable that this event is handled with immediate return even if it is not used by the custom handler because the Interrupt event is raised on every MCU interrupt and the “empty” return handler ensures the shortest possible interrupt routine response time. 54 // ! Only global variables or local ones marked by static keyword can be used to allow reentrancy. 55 // ! Make sure race condition does not occur when accessing those variables at other places. 56 // ! Make sure( inspect.lst file generated by C compiler ) compiler does not create any hidden temporary local variable( occurs when using division, multiplication or bit shifts ) at the event handler code.The name of such variable is usually Cnumbercnt. 57 // ! Do not call any OS functions except setINDFx(). 58 // ! Do not use any OS variables especially for writing access. 59 // ! All above rules apply also to any other function being called from the event handler code, although calling any function from Interrupt event is not recommended because of additional MCU stack usage. 60 61 return Carry; 62 #endif 63 // ------------------------------------------------- 64 case DpaEvent_PeerToPeer: 65 // Called when peer-to-peer (non-networking) packet is received 66 67 // Handle peer-to-peer packet received by the build-in DPA support. Those packets are sent at the same channel the main network work at. 68 HandlerPeer2PeerPacket(); 69 break; 70 71 // ------------------------------------------------- 72 case DpaEvent_Idle: 73 { 74 // Do a quick background work when RF packet is not received 75 76 // Try to receive peer-to-peer packets at the secondary main network channel. This avoids RF jamming of the main network. 77 78 // Save state of the filtering. 79 bit saveFiltering = _filterCurrentNetwork; 80 // Packet not received yet 81 bit handlePacket = FALSE; 82 // Change the channel 83 setRFchannel( DpaApiReadConfigByte( CFGIND_CHANNEL_B ) ); 84 // Disable filtering to allow receiving of peer-to-peer packets 85 setNetworkFilteringOff(); 86 87 // Try to receive packet 88 if ( checkRF( DpaApiReadConfigByte( CFGIND_RXFILTER ) ) && RFRXpacket() ) 89 // Some packet received! 90 handlePacket = TRUE; 91 92 // Before handling the packet restore RF settings (there might be needed for the correct DPA command, that is stored in the packet, execution) 93 // Restore channel 94 DpaApiSetRfDefaults(); 95 // Restore network filtering 96 if ( saveFiltering ) 97 setNetworkFilteringOn(); 98 99 // If packet was received, handle it 100 if ( handlePacket ) 101 HandlerPeer2PeerPacket(); 102 103 break; 104 } 105 } 106 107 return FALSE; 108 } 109 110 //############################################################################################ 111 void HandlerPeer2PeerPacket() 112 //############################################################################################ 113 { 114 // Peer-to-peer "DPA" packet? 115 if ( _DPAF ) 116 { 117 // Is my local address matched? 118 if ( _DpaParams == ntwADDR ) 119 { 120 // Just execute the DPA request 121 DpaApiLocalRequest(); 122 // Make sure LED is visible at LP mode 123 waitMS( 20 ); 124 } 125 } 126 else 127 { 128 // Pure peer-to-peer packet 129 130 // Is my peer-to-peer packet (check length and content) 131 if ( DLEN == 2 && bufferRF[0] == 'P' && bufferRF[1] == ntwADDR ) 132 { 133 // Pulse red LED 134 pulseLEDR(); 135 // Make sure LED is visible at LP mode 136 waitMS( 20 ); 137 } 138 } 139 } 140 //############################################################################################ 141 // Default Custom DPA Handler header; 2nd include to implement Code bumper to detect too long code of the Custom DPA Handler (modify the path according to your setup) 142 #include "DPAcustomHandler.h" 143 //############################################################################################