/**@file Common-use GSM declarations, most from the GSM 04.xx and 05.xx series. */ /* * Copyright 2008 Free Software Foundation, Inc. * * This software is distributed under the terms of the GNU Public License. * See the COPYING file in the main directory for details. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #ifndef GSMTDMA_H #define GSMTDMA_H #include "GSMCommon.h" namespace GSM { /** A description of a channel's multiplexing pattern. From GSM 05.02 Clause 7. This object encodes a line from tables 1-4 in the spec. The columns of interest in this encoding are: - 1, Channel Designation - 2, Subchannel - 3, Direction - 4, Allowable Time Slot Assignments - 5, Allowable RF Channel Assignments - 7, Repeat Length in TDMA Frames - 8, Interleaved Block TDMA Frame Mapping Col 6, Burst Type, is implied by 1 & 2 and encoded into the transcevier source code. */ class TDMAMapping { public: /// The longest "repeat length" of any channel we support is 104 for the SACCH/TF. static const unsigned mMaxRepeatLength = 104; private: TypeAndOffset mTypeAndOffset; ///< col 1, 2, encoded as per GSM 04.08 10.5.2.5 bool mDownlink; ///< col 3, true for downlink channels bool mUplink; ///< col 3, true for uplink channels char mAllowedSlots; ///< col 4, an 8-bit mask bool mC0Only; ///< col 5, true if channel is limited to C0 unsigned mRepeatLength; ///< col 7 unsigned mNumFrames; ///< number of occupied frames in col 8 const unsigned *mFrameMapping; ///< col 8 unsigned mReverseMapping[mMaxRepeatLength]; ///< index reversal of mapping, -1 means unused public: /** Construct a TDMAMapping, encoding one line of GSM 05.02 Clause 7 Tables 1-4. @param wTypeAndOffset Encoding of "Channel designnation". See GSM 04.08 10.5.2.5. @param wDownlink True for downlink and bidirectional hannels @param wUplink True for uplink and bidirectional channels @param wRepeatLength "Repeat Length in TDMA Frames" @param wNumFrames Number of occupied TDMA frames in frame mapping. @param wFrameMapping "Interleaved Block TDMA Frame Mapping" -- MUST PERSIST!! */ TDMAMapping(TypeAndOffset wTypeAndOffset, bool wDownlink, bool wUplink, char wAllowedSlots, bool wC0Only, unsigned wRepeatLength, unsigned wNumFrames, const unsigned *wFrameMapping); /** Given a count of frames sent, return the corresponding frame number. */ unsigned frameMapping(unsigned count) const { return mFrameMapping[count % mNumFrames]; } /** Given a frame number, return the corresponding count, modulo patten length. */ int reverseMapping(unsigned FN) const { return mReverseMapping[FN % mRepeatLength]; } /**@name Simple accessors. */ //@{ unsigned numFrames() const { return mNumFrames; } unsigned repeatLength() const { return mRepeatLength; } TypeAndOffset typeAndOffset() const { return mTypeAndOffset; } bool uplink() const { return mUplink; } bool downlink() const { return mDownlink; } bool C0Only() const { return mC0Only; } //@} ///< Return true if this channel is allowed on this slot. bool allowedSlot(unsigned slot) const { return mAllowedSlots & (1<