1 /* JTAG routines 2 3 Copyright (C) 2004 Andrew Rogers 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ 18 19 20 21 #ifndef JTAG_H 22 #define JTAG_H 23 24 #include <vector> 25 26 #include "iobase.h" 27 28 typedef unsigned char byte; 29 30 class Jtag 31 { 32 private: 33 static const int MAXNUMDEVICES=1000; 34 protected: 35 struct chainParam_t 36 { 37 byte idcode[4]; // Store IDCODE 38 //byte bypass[4]; // The bypass instruction. Most instruction register lengths are a lot less than 32 bits. 39 int irlen; // instruction register length. 40 }; 41 std::vector<chainParam_t> devices; 42 IOBase *io; 43 int numDevices; 44 IOBase::tapState_t postDRState; 45 IOBase::tapState_t postIRState; 46 int deviceIndex; 47 FILE *logfile; 48 bool shiftDRincomplete; 49 public: 50 Jtag(IOBase *iob); 51 int getChain(); // Shift IDCODEs from devices setPostDRState(IOBase::tapState_t s)52 inline void setPostDRState(IOBase::tapState_t s){postDRState=s;} setPostIRState(IOBase::tapState_t s)53 inline void setPostIRState(IOBase::tapState_t s){postIRState=s;} 54 int setDeviceIRLength(int dev, int len); getDeviceID(int dev)55 inline byte *getDeviceID(int dev){ 56 if(dev>=devices.size())return 0; 57 return devices[dev].idcode; 58 } 59 int selectDevice(int dev); 60 void shiftDR(const byte *tdi, byte *tdo, int length, int align=0, bool exit=true);// Some devices use TCK for aligning data, for example, Xilinx FPGAs for configuration data. 61 void shiftIR(const byte *tdi, byte *tdo=0); // No length argumant required as IR length specified in chainParam_t 62 }; 63 64 #endif //JTAG_H 65