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/***************************************************************************
* Copyright (C) 2008 by Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* This program 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. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "interface.h"
#include "bitbang.h"
/* my private tap controller state, which tracks state for calling code */
static tap_state_t dummy_state = TAP_RESET;
static int dummy_clock; /* edge detector */
static int clock_count; /* count clocks in any stable state, only stable states */
static uint32_t dummy_data;
static int dummy_speed(int speed);
static int dummy_register_commands(struct command_context_s *cmd_ctx);
static int dummy_init(void);
static int dummy_quit(void);
static int dummy_khz(int khz, int *jtag_speed);
static int dummy_speed_div(int speed, int *khz);
/* The dummy driver is used to easily check the code path
* where the target is unresponsive.
*/
jtag_interface_t dummy_interface =
{
.name = "dummy",
.execute_queue = bitbang_execute_queue,
.speed = dummy_speed,
.register_commands = dummy_register_commands,
.khz = dummy_khz,
.speed_div = dummy_speed_div,
.init = dummy_init,
.quit = dummy_quit,
};
static int dummy_read(void);
static void dummy_write(int tck, int tms, int tdi);
static void dummy_reset(int trst, int srst);
static void dummy_led(int on);
static bitbang_interface_t dummy_bitbang =
{
.read = dummy_read,
.write = dummy_write,
.reset = dummy_reset,
.blink = dummy_led
};
static int dummy_read(void)
{
int data = 1 & dummy_data;
dummy_data = (dummy_data >> 1) | (1<<31);
return data;
}
static void dummy_write(int tck, int tms, int tdi)
{
/* TAP standard: "state transitions occur on rising edge of clock" */
if ( tck != dummy_clock )
{
if ( tck )
{
tap_state_t old_state = dummy_state;
dummy_state = tap_state_transition( old_state, tms );
if ( old_state != dummy_state )
{
if ( clock_count )
{
LOG_DEBUG("dummy_tap: %d stable clocks", clock_count);
clock_count = 0;
}
LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state) );
#if defined(DEBUG)
if (dummy_state == TAP_DRCAPTURE)
dummy_data = 0x01255043;
#endif
}
else
{
/* this is a stable state clock edge, no change of state here,
* simply increment clock_count for subsequent logging
*/
++clock_count;
}
}
dummy_clock = tck;
}
}
static void dummy_reset(int trst, int srst)
{
dummy_clock = 0;
if (trst || (srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
dummy_state = TAP_RESET;
LOG_DEBUG("reset to: %s", tap_state_name(dummy_state) );
}
static int dummy_khz(int khz, int *jtag_speed)
{
if (khz==0)
{
*jtag_speed=0;
}
else
{
*jtag_speed=64000/khz;
}
return ERROR_OK;
}
static int dummy_speed_div(int speed, int *khz)
{
if (speed==0)
{
*khz = 0;
}
else
{
*khz=64000/speed;
}
return ERROR_OK;
}
static int dummy_speed(int speed)
{
return ERROR_OK;
}
static int dummy_register_commands(struct command_context_s *cmd_ctx)
{
return ERROR_OK;
}
static int dummy_init(void)
{
bitbang_interface = &dummy_bitbang;
return ERROR_OK;
}
static int dummy_quit(void)
{
return ERROR_OK;
}
static void dummy_led(int on)
{
}
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