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[/] [openrisc/] [trunk/] [orpsocv2/] [bench/] [sysc/] [src/] [TapAction.cpp] - Rev 179
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// ---------------------------------------------------------------------------- // TAP action header: abstract class implementation // Copyright (C) 2009 Embecosm Limited <info@embecosm.com> // Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> // This file is part of the Embecosm cycle accurate SystemC JTAG library. // This program is free software: you can redistribute it and/or modify it // under the terms of the GNU Lesser 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 Lesser General Public // License for more details. // You should have received a copy of the GNU Lesser General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. // The C/C++ parts of this program are commented throughout in a fashion // suitable for processing with Doxygen. // ---------------------------------------------------------------------------- // $Id$ #include <iostream> #include "TapAction.h" class sc_event; //! Constructor //! Records the SystemC event used to notify completion and sets the //! resetCounter to zero. //! @param _actionType The action type TapAction::TapAction (sc_core::sc_event *_doneEvent) : doneEvent (_doneEvent), resetCounter (0) { } // TapAction () //! Accessor to get the SystemC completion event //! @return The SystemC completion event sc_core::sc_event * TapAction::getDoneEvent () { return doneEvent; } // getDoneEvent () //! Function to check the TAP is in a consistent state, optionally with a //! warning. //! This is a convenience for subclasses (hence protected), so they can ensure //! the state machine is in a consistent state. //! @note The method returns TRUE to indicate that the machine is in the //! consistent state. However the TapStateMachine resetDone flag is set //! when the final TMS is set - the state will only be reached IF that //! TMS is driven. This mechanism gives users flexibility. They can //! detect the final TMS being driven. //! @param[in] tapStateMachine The TAP state machine with which we are //! associated. //! @param[out] tms The value to drive on the JTAG TMS //! @param[in] warn True to indicate a warning message should be //! issued when starting a reset cycle. //! @return TRUE if the TAP state machine was already in a consistent state. bool TapAction::checkResetDone (TapStateMachine *tapStateMachine, bool &tms, bool warn) { // Nothing more to do if we are consistent if (tapStateMachine->getResetDone ()) { return true; } // Need to reset. If requested and this is the first cycle of reset, give a // warning. if (warn && (0 == resetCounter)) { std::cerr << "JTAG TAP state inconsistent: resetting" << std::endl; } // Drive towards reset resetCounter++; tms = 1; // If we have got to the end of the reset sequence we can clear the // tapStateMachine and report we are consistent. However we will not return // true until the next call. if (tapStateMachine->TAP_RESET_CYCLES == resetCounter) { tapStateMachine->setResetDone (true); resetCounter = 0; // Ready for next time } else { return false; } } // checkResetDone ()
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