improve command handling examples
[openocd.git] / src / jtag / dummy.c
1 /***************************************************************************
2 * Copyright (C) 2008 by √ėyvind Harboe *
3 * oyvind.harboe@zylin.com *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include "interface.h"
25 #include "bitbang.h"
26 #include "../hello.h"
27
28
29 /* my private tap controller state, which tracks state for calling code */
30 static tap_state_t dummy_state = TAP_RESET;
31
32 static int dummy_clock; /* edge detector */
33
34 static int clock_count; /* count clocks in any stable state, only stable states */
35
36 static uint32_t dummy_data;
37
38
39 static int dummy_read(void)
40 {
41 int data = 1 & dummy_data;
42 dummy_data = (dummy_data >> 1) | (1 << 31);
43 return data;
44 }
45
46
47 static void dummy_write(int tck, int tms, int tdi)
48 {
49 /* TAP standard: "state transitions occur on rising edge of clock" */
50 if (tck != dummy_clock)
51 {
52 if (tck)
53 {
54 tap_state_t old_state = dummy_state;
55 dummy_state = tap_state_transition(old_state, tms);
56
57 if (old_state != dummy_state)
58 {
59 if (clock_count)
60 {
61 LOG_DEBUG("dummy_tap: %d stable clocks", clock_count);
62 clock_count = 0;
63 }
64
65 LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state));
66
67 #if defined(DEBUG)
68 if (dummy_state == TAP_DRCAPTURE)
69 dummy_data = 0x01255043;
70 #endif
71 }
72 else
73 {
74 /* this is a stable state clock edge, no change of state here,
75 * simply increment clock_count for subsequent logging
76 */
77 ++clock_count;
78 }
79 }
80 dummy_clock = tck;
81 }
82 }
83
84 static void dummy_reset(int trst, int srst)
85 {
86 dummy_clock = 0;
87
88 if (trst || (srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
89 dummy_state = TAP_RESET;
90
91 LOG_DEBUG("reset to: %s", tap_state_name(dummy_state));
92 }
93
94 static void dummy_led(int on)
95 {
96 }
97
98 static struct bitbang_interface dummy_bitbang = {
99 .read = &dummy_read,
100 .write = &dummy_write,
101 .reset = &dummy_reset,
102 .blink = &dummy_led,
103 };
104
105
106 static int dummy_khz(int khz, int *jtag_speed)
107 {
108 if (khz == 0)
109 {
110 *jtag_speed = 0;
111 }
112 else
113 {
114 *jtag_speed = 64000/khz;
115 }
116 return ERROR_OK;
117 }
118
119 static int dummy_speed_div(int speed, int *khz)
120 {
121 if (speed == 0)
122 {
123 *khz = 0;
124 }
125 else
126 {
127 *khz = 64000/speed;
128 }
129
130 return ERROR_OK;
131 }
132
133 static int dummy_speed(int speed)
134 {
135 return ERROR_OK;
136 }
137
138 static int dummy_init(void)
139 {
140 bitbang_interface = &dummy_bitbang;
141
142 return ERROR_OK;
143 }
144
145 static int dummy_quit(void)
146 {
147 return ERROR_OK;
148 }
149
150 static const struct command_registration dummy_command_handlers[] = {
151 {
152 .name = "dummy",
153 .mode = COMMAND_ANY,
154 .help = "dummy interface driver commands",
155
156 .chain = hello_command_handlers,
157 },
158 COMMAND_REGISTRATION_DONE,
159 };
160
161 /* The dummy driver is used to easily check the code path
162 * where the target is unresponsive.
163 */
164 struct jtag_interface dummy_interface = {
165 .name = "dummy",
166
167 .commands = dummy_command_handlers,
168
169 .execute_queue = &bitbang_execute_queue,
170
171 .speed = &dummy_speed,
172 .khz = &dummy_khz,
173 .speed_div = &dummy_speed_div,
174
175 .init = &dummy_init,
176 .quit = &dummy_quit,
177 };

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