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git://projects.qi-hardware.com/nn-usb-fpga.git
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75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
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/* JTAG routines
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Copyright (C) 2004 Andrew Rogers
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef JTAG_H
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#define JTAG_H
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#include <vector>
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#include <stdio.h>
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#include "iobase.h"
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typedef unsigned char byte;
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class Jtag
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{
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private:
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static const int MAXNUMDEVICES=1000;
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protected:
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struct chainParam_t
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{
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unsigned long idcode; // Store IDCODE
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//byte bypass[4]; // The bypass instruction. Most instruction register lengths are a lot less than 32 bits.
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int irlen; // instruction register length.
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};
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std::vector<chainParam_t> devices;
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IOBase *io;
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int numDevices;
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IOBase::tapState_t postDRState;
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IOBase::tapState_t postIRState;
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int deviceIndex;
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FILE *logfile;
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bool shiftDRincomplete;
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public:
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Jtag(IOBase *iob);
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int getChain(); // Shift IDCODEs from devices
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inline void setPostDRState(IOBase::tapState_t s){postDRState=s;}
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inline void setPostIRState(IOBase::tapState_t s){postIRState=s;}
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int setDeviceIRLength(int dev, int len);
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unsigned long getDeviceID(int dev){
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if(dev>=devices.size())return 0;
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return devices[dev].idcode;
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}
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int selectDevice(int dev);
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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.
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void shiftIR(const byte *tdi, byte *tdo=0); // No length argumant required as IR length specified in chainParam_t
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inline void longToByteArray(unsigned long l, byte *b){
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b[0]=(byte)(l&0xff);
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b[1]=(byte)((l>>8)&0xff);
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b[2]=(byte)((l>>16)&0xff);
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b[3]=(byte)((l>>24)&0xff);
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}
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inline unsigned long byteArrayToLong(byte *b){
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return (b[3]<<24)+(b[2]<<16)+(b[1]<<8)+b[0];
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}
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};
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#endif //JTAG_H
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