mirror of
git://projects.qi-hardware.com/nn-usb-fpga.git
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107 lines
3.0 KiB
C++
107 lines
3.0 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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#include "jtag.h"
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Jtag::Jtag(IOBase *iob)
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{
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io=iob;
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postDRState=IOBase::RUN_TEST_IDLE;
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postIRState=IOBase::RUN_TEST_IDLE;
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deviceIndex=-1;
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shiftDRincomplete=false;
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}
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int Jtag::getChain()
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{
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io->tapTestLogicReset();
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io->setTapState(IOBase::SHIFT_DR);
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byte idx[4];
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byte zero[4];
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numDevices=0;
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for(int i=0; i<4; i++)zero[i]=0;
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do{
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io->shiftTDITDO(zero,idx,32,false);
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unsigned long id=byteArrayToLong(idx);
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if(id!=0){
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numDevices++;
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chainParam_t dev;
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dev.idcode=id;
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printf("Device with ID=%x found\n", id);
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devices.insert(devices.begin(),dev);
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}
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else break;
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}while(numDevices<MAXNUMDEVICES);
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io->setTapState(IOBase::TEST_LOGIC_RESET);
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return numDevices;
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}
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int Jtag::selectDevice(int dev)
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{
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if(dev>=numDevices)deviceIndex=-1;
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else deviceIndex=dev;
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return deviceIndex;
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}
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int Jtag::setDeviceIRLength(int dev, int len)
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{
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if(dev>=numDevices||dev<0)return -1;
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devices[dev].irlen=len;
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return dev;
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}
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void Jtag::shiftDR(const byte *tdi, byte *tdo, int length, int align, bool exit)
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{
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if(deviceIndex<0)return;
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int post=deviceIndex;
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if(!shiftDRincomplete){
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io->setTapState(IOBase::SHIFT_DR);
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int pre=numDevices-deviceIndex-1;
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if(align){
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pre=-post;
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while(pre<=0)pre+=align;
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}
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io->shift(false,pre,false);
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}
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if(tdi!=0&&tdo!=0)io->shiftTDITDO(tdi,tdo,length,post==0&&exit);
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else if(tdi!=0&&tdo==0)io->shiftTDI(tdi,length,post==0&&exit);
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else if(tdi==0&&tdo!=0)io->shiftTDO(tdo,length,post==0&&exit);
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else io->shift(false,length,post==0&&exit);
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if(exit){
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io->shift(false,post);
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io->setTapState(postDRState);
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shiftDRincomplete=false;
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}
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else shiftDRincomplete=true;
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}
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void Jtag::shiftIR(const byte *tdi, byte *tdo)
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{
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if(deviceIndex<0)return;
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io->setTapState(IOBase::SHIFT_IR);
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int pre=0;
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for(int dev=deviceIndex+1; dev<numDevices; dev++)pre+=devices[dev].irlen; // Calculate number of pre BYPASS bits.
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int post=0;
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for(int dev=0; dev<deviceIndex; dev++)post+=devices[dev].irlen; // Calculate number of post BYPASS bits.
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io->shift(true,pre,false);
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if(tdo!=0)io->shiftTDITDO(tdi,tdo,devices[deviceIndex].irlen,post==0);
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else if(tdo==0)io->shiftTDI(tdi,devices[deviceIndex].irlen,post==0);
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io->shift(true,post);
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io->setTapState(postIRState);
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}
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