1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4 * Copyright (C) 2016-2020 by Marc Schink <dev@zapb.de>
15 #include <helper/log.h>
16 #include <helper/list.h>
17 #include <target/target.h>
18 #include <target/rtt.h>
23 struct rtt_source source;
25 struct rtt_control ctrl;
26 struct target *target;
27 /** Start address to search for the control block. */
29 /** Size of the control block search area. */
31 /** Control block identifier. */
32 char id[RTT_CB_MAX_ID_LENGTH];
33 /** Whether RTT is configured. */
35 /** Whether RTT is started. */
37 /** Whether configuration changed. */
39 /** Whether the control block was found. */
42 struct rtt_sink_list **sink_list;
43 size_t sink_list_length;
45 unsigned int polling_interval;
50 rtt.sink_list_length = 1;
51 rtt.sink_list = calloc(rtt.sink_list_length,
52 sizeof(struct rtt_sink_list *));
57 rtt.sink_list[0] = NULL;
60 rtt.polling_interval = 100;
72 static int read_channel_callback(void *user_data)
76 ret = rtt.source.read(rtt.target, &rtt.ctrl, rtt.sink_list,
77 rtt.sink_list_length, NULL);
79 if (ret != ERROR_OK) {
80 target_unregister_timer_callback(&read_channel_callback, NULL);
81 rtt.source.stop(rtt.target, NULL);
88 int rtt_setup(target_addr_t address, size_t size, const char *id)
90 size_t id_length = strlen(id);
92 if (!id_length || id_length >= RTT_CB_MAX_ID_LENGTH) {
93 LOG_ERROR("rtt: Invalid control block ID");
94 return ERROR_COMMAND_ARGUMENT_INVALID;
99 strncpy(rtt.id, id, id_length + 1);
101 rtt.configured = true;
106 int rtt_register_source(const struct rtt_source source,
107 struct target *target)
109 if (!source.find_cb || !source.read_cb || !source.read_channel_info)
112 if (!source.start || !source.stop)
115 if (!source.read || !source.write)
127 target_addr_t addr = rtt.addr;
132 if (!rtt.found_cb || rtt.changed) {
133 rtt.source.find_cb(rtt.target, &addr, rtt.size, rtt.id,
134 &rtt.found_cb, NULL);
139 LOG_INFO("rtt: Control block found at 0x%" TARGET_PRIxADDR,
141 rtt.ctrl.address = addr;
143 LOG_INFO("rtt: No control block found");
148 ret = rtt.source.read_cb(rtt.target, rtt.ctrl.address, &rtt.ctrl, NULL);
153 ret = rtt.source.start(rtt.target, &rtt.ctrl, NULL);
158 target_register_timer_callback(&read_channel_callback,
159 rtt.polling_interval, 1, NULL);
169 if (!rtt.configured) {
170 LOG_ERROR("rtt: Not configured");
174 target_unregister_timer_callback(&read_channel_callback, NULL);
177 ret = rtt.source.stop(rtt.target, NULL);
185 static int adjust_sink_list(size_t length)
187 struct rtt_sink_list **tmp;
189 if (length <= rtt.sink_list_length)
192 tmp = realloc(rtt.sink_list, sizeof(struct rtt_sink_list *) * length);
197 for (size_t i = rtt.sink_list_length; i < length; i++)
201 rtt.sink_list_length = length;
206 int rtt_register_sink(unsigned int channel_index, rtt_sink_read read,
209 struct rtt_sink_list *tmp;
211 if (channel_index >= rtt.sink_list_length) {
212 if (adjust_sink_list(channel_index + 1) != ERROR_OK)
216 LOG_DEBUG("rtt: Registering sink for channel %u", channel_index);
218 tmp = malloc(sizeof(struct rtt_sink_list));
224 tmp->user_data = user_data;
225 tmp->next = rtt.sink_list[channel_index];
227 rtt.sink_list[channel_index] = tmp;
232 int rtt_unregister_sink(unsigned int channel_index, rtt_sink_read read,
235 struct rtt_sink_list *prev_sink;
237 LOG_DEBUG("rtt: Unregistering sink for channel %u", channel_index);
239 if (channel_index >= rtt.sink_list_length)
242 prev_sink = rtt.sink_list[channel_index];
244 for (struct rtt_sink_list *sink = rtt.sink_list[channel_index]; sink;
245 prev_sink = sink, sink = sink->next) {
246 if (sink->read == read && sink->user_data == user_data) {
248 if (sink == rtt.sink_list[channel_index])
249 rtt.sink_list[channel_index] = sink->next;
251 prev_sink->next = sink->next;
262 int rtt_get_polling_interval(unsigned int *interval)
267 *interval = rtt.polling_interval;
272 int rtt_set_polling_interval(unsigned int interval)
277 if (rtt.polling_interval != interval) {
278 target_unregister_timer_callback(&read_channel_callback, NULL);
279 target_register_timer_callback(&read_channel_callback, interval, 1,
283 rtt.polling_interval = interval;
288 int rtt_write_channel(unsigned int channel_index, const uint8_t *buffer,
291 if (channel_index >= rtt.ctrl.num_up_channels) {
292 LOG_WARNING("rtt: Down-channel %u is not available", channel_index);
296 return rtt.source.write(rtt.target, &rtt.ctrl, channel_index, buffer,
300 bool rtt_started(void)
305 bool rtt_configured(void)
307 return rtt.configured;
310 bool rtt_found_cb(void)
315 const struct rtt_control *rtt_get_control(void)
320 int rtt_read_channel_info(unsigned int channel_index,
321 enum rtt_channel_type type, struct rtt_channel_info *info)
323 return rtt.source.read_channel_info(rtt.target, &rtt.ctrl,
324 channel_index, type, info, NULL);