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ezusb_jtag.cpp

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/*
 * This file is part of Jelie,
 * (c) 2002 Julien Pilet <julien.pilet@epfl.ch> and
 * Stephane Magnenat <stephane.magnenat@epfl.ch>
 *
 * Jelie 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 2 of the License,
 * or (at your option) any later version.
 *
 * Jelie 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 Foobar; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "ezusb_jtag.h"
#include "jtag_order.h"
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <signal.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#else
#define RETSIGTYPE void
#endif

//#define VERBOSE_JTAG_CMD

EzUSBJTAG *ezusb_jtag_ptr=NULL;

RETSIGTYPE criticalStop(int i)
{
        fprintf(stderr, "Received unexpected critical stop, resetting USB and quitting\n");
        if (ezusb_jtag_ptr)
                ezusb_jtag_ptr->forceClose();
        exit(-1);
}


EzUSBJTAG::EzUSBJTAG()
:EzUSB(0) 
{
        queuePos=0;
        // install signals handler
        signal(SIGTERM, criticalStop); 
        signal(SIGINT, criticalStop);
        signal(SIGQUIT, criticalStop); 
        signal(SIGSEGV, criticalStop);
        signal(SIGPIPE, criticalStop);
}

EzUSBJTAG::~EzUSBJTAG()
{
        // remove signal handler
        signal(SIGTERM, SIG_DFL); 
        signal(SIGINT, SIG_DFL);
        signal(SIGQUIT, SIG_DFL); 
        signal(SIGSEGV, SIG_DFL);
        signal(SIGPIPE, SIG_DFL);
}

void EzUSBJTAG::writeAndReadBuffer(unsigned char *buffer, int toWrite, int toRead, unsigned long delay)
{
        if (toWrite)
        {
                int wReturn=usb_bulk_write(devHandle, 2, (char *)buffer, toWrite, 50);
                if (wReturn<0)
                        fprintf(stderr, "USB : WRITE ERROR : %s\n", usb_strerror());
        }
        if (delay)
                usleep(delay);
        if (toRead)
        {
                int rReturn=usb_bulk_read(devHandle, 2, (char *)buffer, toRead, 50);
                if (rReturn<0)
                        fprintf(stderr, "USB : READ ERROR : %s\n", usb_strerror());
        }
}

bool EzUSBJTAG::init(int argc, char **argv)
{
        parseCmdLine(argc, argv);
        if (!findDevice())
                return false;

        ezusb_jtag_ptr = this;

        if (!downloadFirmware("jtag_usb.ihx")) {
                return false;
        }
        if (usb_set_altinterface(devHandle, 1)<0)
        {
                fprintf(stderr, "USB : SET ALT ERROR : %s\n", usb_strerror());
                return false;
        }

        unsigned char c=JO_SELF_TEST;

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_SELF_TEST\n");
#endif
        
        writeAndReadBuffer(&c, 1, 1, 2000000);
        if (c!=0xBC)
        {
                fprintf(stderr, "SELF TEST FAILURE (received 0x%02x instead of 0xBC) !!!\n", c);
                return false;
        }
        return true;
}

void EzUSBJTAG::ireg(unsigned char *data)
{
        unsigned char buffer[2];

        buffer[0]=JO_IREG;
        buffer[1]=data[0];

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_IREG\n");
#endif
        
        flushQueue();
        writeAndReadBuffer(buffer, 2, 1);

        data[0]=buffer[0];
}

void EzUSBJTAG::dreg(unsigned char *data, unsigned char length, bool writeOnly=false)
{
        unsigned char buffer[10];
        unsigned char dataLength=(length>>3)+(length & 7 ? 1 : 0);
        
        assert(length<=64);

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_DREG\n");
#endif

        if (writeOnly)
        {
                // if write only, queuing is used to provide bigger packet transfer
                int dregSize=2+dataLength;
                if (queuePos+dregSize>64)
                        flushQueue();
                
                queue[queuePos]=JO_DREG_WRITE_ONLY;
                queue[queuePos+1]=length;
                memcpy(queue+queuePos+2, data, dataLength);
                
                queuePos+=dregSize;
        }
        else
        {
                buffer[0]=JO_DREG;
                buffer[1]=length;
                memcpy(buffer+2, data, dataLength);
                
                flushQueue();
                writeAndReadBuffer(buffer, dataLength+2, (writeOnly ? 0 : dataLength));
                
                memcpy(data, buffer, dataLength);
        }
}

void EzUSBJTAG::jtagReset(void)
{
        unsigned char buffer[1];

        buffer[0]=JO_JTAG_RESET;

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_JTAG_RESET\n");
#endif
        
        flushQueue();
        writeAndReadBuffer(buffer, 1, 0);
}

void EzUSBJTAG::cpuReset(bool state)
{
        unsigned char buffer[2];

        buffer[0]=JO_CPU_RESET;
        buffer[1]=state ? 1 : 0;

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_CPU_RESET\n");
#endif
        
        flushQueue();
        writeAndReadBuffer(buffer, 2, 0);
}

void EzUSBJTAG::trst(bool state)
{
        unsigned char buffer[2];

        buffer[0]=JO_TRST;
        buffer[1]=state ? 1 : 0;

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_TRST\n");
#endif
        
        flushQueue();
        writeAndReadBuffer(buffer, 2, 0);
}

void EzUSBJTAG::idle(unsigned int nbTCK)
{
        unsigned char buffer[3];

        buffer[0]=JO_IDLE;
        buffer[1]=nbTCK&0xFF;
        buffer[2]=(nbTCK>>8)&0xFF;

#ifdef VERBOSE_JTAG_CMD
        printf("JTAG : Sending JO_IDLE\n");
#endif

        flushQueue();
        writeAndReadBuffer(buffer, 3, 0);
}

void EzUSBJTAG::flushQueue(void)
{
        assert(queuePos<=64);
        if (queuePos>0)
        {
                writeAndReadBuffer(queue, queuePos, 0);
                queuePos=0;
        }
}

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