jtag.h

linux下的jtag调试软件

/*
 * This file is part of Jelie,
 * (c) 2002 Julien Pilet <[e-mail]> and
 * Stephane Magnenat <[e-mail]>
 *
 * 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
 */

/*! This is the main JTAG header that has the JTAG interface
 * and some constants
 *
 * \author Julien Pilet <[e-mail]>
 * \author Stephane Magnenat <[e-mail]>
 */

#ifndef _JTAG_H_
#define _JTAG_H_

//! 5 bits JTAG commands for the Intel PXA250.
#define JTAG_IRLENGTH 5

//! Low level JTAG control interface.
/*! Gives access to JTAG instruction register (ireg)
	and data register (dreg).
	With this interface it is possible to have multiple
	JTAG physical implementations. */
class JTAGControl {
public:
	//! Initialize the link with the connection device.
	/*!	\param argc number of command line argument
	 	\param argv array of char* that contains the arguments
	 	\return true on success, false on error. */
	virtual bool init(int argc, char **argv)=0;

	//! Read and write the jtag instruction register.
	/*! \param data a pointer to a buffer which will be exchanged with the
	 	JTAG instruction register. It always contains only 5 bit so it's one
		byte wide.
		\return nothing.
	*/
	virtual void ireg(unsigned char *data)=0;

	//! Read and write the jtag data register.
	/*! \param data a pointer to a buffer which will be exchanged with the
		JTAG data register.
		\param length number of bits to read/write. 
		\param writeOnly only write, do not read back
		\return nothing.
	 */
	virtual void dreg(unsigned char *data, unsigned char length, bool writeOnly=false)=0;

	//! Put the JTAG in run test/idle mode
	/*! \return nothing. */
	virtual void jtagReset(void)=0;

	//! Assert or deassert the cpu reset line.
	/*! \param state logical state of the CPU Reset line
		\return nothing.
	*/
	virtual void cpuReset(bool state)=0;

	//! Assert or deassert the TRST (JTAG Reset)
	/*! \param state logical state of the TRST line
	 	\return nothing.
	*/
	virtual void trst(bool state)=0;

	//! Idle for some TCKs in the run test/idle state.
	/*! \param nbTCK number of clock cycle (16 bit width integer).
	 	\return nothing.
	*/
	virtual void idle(unsigned int nbTCK)=0;

	//! FLush the write only jtag command queue
	virtual void flushQueue(void)=0;

	//! Return the name of the Jtag Control (like usb, pp)
	virtual const char *getName(void) const =0;
};

#endif // _JTAG_H_