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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2018 Sven Bursch-Osewold <sb_git@bursch.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include "protocol.h" | |
22 | ||
23 | /* Log a byte-array as hex values. */ | |
24 | static void log_buf(const char *message, uint8_t buf[], size_t count) | |
25 | { | |
26 | char buffer[count * 2 + 1]; | |
27 | ||
28 | for (size_t j = 0; j < count; j++) | |
29 | sprintf(&buffer[2 * j], "%02X", buf[j]); | |
30 | ||
31 | buffer[count * 2] = 0; | |
32 | ||
33 | sr_dbg("%s: %s [%zu bytes]", message, buffer, count); | |
34 | } | |
35 | ||
36 | /* Send a command to the device. */ | |
37 | static int send_cmd(struct sr_serial_dev_inst *serial, uint8_t buf[], size_t count) | |
38 | { | |
39 | int ret; | |
40 | ||
41 | log_buf("Sending", buf, count); | |
42 | ret = serial_write_blocking(serial, buf, count, 0); | |
43 | if (ret < 0) { | |
44 | sr_err("Error sending command: %d.", ret); | |
45 | return ret; | |
46 | } | |
47 | ||
48 | return (ret == (int)count) ? SR_OK : SR_ERR; | |
49 | } | |
50 | ||
51 | /* Decode high byte and low byte into a float. */ | |
52 | static float decode_value(uint8_t hi, uint8_t lo, float divisor) | |
53 | { | |
54 | return ((float)hi * 240.0 + (float)lo) / divisor; | |
55 | } | |
56 | ||
57 | /* Encode a float into high byte and low byte. */ | |
58 | static void encode_value(float current, uint8_t *hi, uint8_t *lo, float divisor) | |
59 | { | |
60 | int value; | |
61 | ||
62 | value = (int)(current * divisor); | |
63 | sr_dbg("Value %d %d %d", value, value / 240, value % 240); | |
64 | *hi = value / 240; | |
65 | *lo = value % 240; | |
66 | } | |
67 | ||
68 | /* Send updated configuration values to the load. */ | |
69 | static int send_cfg(struct sr_serial_dev_inst *serial, struct dev_context *devc) | |
70 | { | |
71 | uint8_t send[] = { 0xfa, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8 }; | |
72 | ||
73 | encode_value(devc->current_limit, &send[2], &send[3], 1000.0); | |
74 | ||
75 | send[8] = send[1] ^ send[2] ^ send[3] ^ send[4] ^ send[5] ^ \ | |
76 | send[6] ^ send[7]; | |
77 | ||
78 | return send_cmd(serial, send, 10); | |
79 | } | |
80 | ||
81 | /* Send the init/connect sequence; drive starts sending voltage and current. */ | |
82 | SR_PRIV int ebd_init(struct sr_serial_dev_inst *serial, struct dev_context *devc) | |
83 | { | |
84 | uint8_t init[] = { 0xfa, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0xf8 }; | |
85 | ||
86 | (void)devc; | |
87 | ||
88 | int ret = send_cmd(serial, init, 10); | |
89 | if (ret == SR_OK) | |
90 | devc->running = TRUE; | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | /* Start the load functionality. */ | |
96 | SR_PRIV int ebd_loadstart(struct sr_serial_dev_inst *serial, struct dev_context *devc) | |
97 | { | |
98 | uint8_t start[] = { 0xfa, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xf8 }; | |
99 | int ret; | |
100 | ||
101 | ret = send_cmd(serial, start, 10); | |
102 | if (ret) | |
103 | return ret; | |
104 | ||
105 | sr_dbg("Current limit: %f.", devc->current_limit); | |
106 | if (ebd_current_is0(devc)) | |
107 | return SR_OK; | |
108 | ||
109 | ret = send_cfg(serial, devc); | |
110 | if (ret == SR_OK) { | |
111 | sr_dbg("Load activated."); | |
112 | devc->load_activated = TRUE; | |
113 | } | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
118 | /* Stop the load functionality. */ | |
119 | SR_PRIV int ebd_loadstop(struct sr_serial_dev_inst *serial, struct dev_context *devc) | |
120 | { | |
121 | int ret; | |
122 | uint8_t stop[] = { 0xfa, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF8 }; | |
123 | ||
124 | ret = send_cmd(serial, stop, 10); | |
125 | if (ret == SR_OK) | |
126 | devc->load_activated = FALSE; | |
127 | ||
128 | return ret; | |
129 | } | |
130 | ||
131 | /* Stop the drive. */ | |
132 | SR_PRIV int ebd_stop(struct sr_serial_dev_inst *serial, struct dev_context *devc) | |
133 | { | |
134 | uint8_t stop[] = { 0xfa, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0xF8 }; | |
135 | int ret; | |
136 | ||
137 | (void) devc; | |
138 | ||
139 | ret = send_cmd(serial, stop, 10); | |
140 | if (ret == SR_OK) { | |
141 | devc->load_activated = FALSE; | |
142 | devc->running= FALSE; | |
143 | } | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
148 | /** Read count bytes from the serial connection. */ | |
149 | SR_PRIV int ebd_read_chars(struct sr_serial_dev_inst *serial, int count, uint8_t *buf) | |
150 | { | |
151 | int ret, received, turns; | |
152 | ||
153 | received = 0; | |
154 | turns = 0; | |
155 | ||
156 | do { | |
157 | ret = serial_read_blocking(serial, buf + received, | |
158 | count - received, serial_timeout(serial, count)); | |
159 | if (ret < 0) { | |
160 | sr_err("Error %d reading %d bytes.", ret, count); | |
161 | return ret; | |
162 | } | |
163 | received += ret; | |
164 | turns++; | |
165 | } while ((received < count) && (turns < 100)); | |
166 | ||
167 | log_buf("Received", buf, received); | |
168 | ||
169 | return received; | |
170 | } | |
171 | ||
172 | SR_PRIV int ebd_receive_data(int fd, int revents, void *cb_data) | |
173 | { | |
174 | struct sr_dev_inst *sdi; | |
175 | struct dev_context *devc; | |
176 | struct sr_serial_dev_inst *serial; | |
177 | struct sr_datafeed_packet packet; | |
178 | struct sr_datafeed_analog analog; | |
179 | struct sr_analog_encoding encoding; | |
180 | struct sr_analog_meaning meaning; | |
181 | struct sr_analog_spec spec; | |
182 | float voltage, current, current_limit; | |
183 | GSList *l; | |
184 | ||
185 | (void)revents; | |
186 | (void)fd; | |
187 | ||
188 | if (!(sdi = cb_data)) | |
189 | return FALSE; | |
190 | ||
191 | if (!(devc = sdi->priv)) | |
192 | return FALSE; | |
193 | ||
194 | serial = sdi->conn; | |
195 | ||
196 | uint8_t reply[MSG_LEN]; | |
197 | int ret = ebd_read_chars(serial, MSG_LEN, reply); | |
198 | ||
199 | /* Tests for correct message. */ | |
200 | if (ret != MSG_LEN) { | |
201 | sr_err("Message invalid [Len]."); | |
202 | return (ret < 0) ? ret : SR_ERR; | |
203 | } | |
204 | ||
205 | uint8_t xor = reply[1] ^ reply[2] ^ reply[3] ^ reply[4] ^ \ | |
206 | reply[5] ^ reply[6] ^ reply[7] ^ reply[8] ^ \ | |
207 | reply[9] ^ reply[10] ^ reply[11] ^ reply[12] ^ \ | |
208 | reply[13] ^ reply[14] ^ reply[15] ^ reply[16]; | |
209 | ||
210 | if (reply[MSG_FRAME_BEGIN_POS] != MSG_FRAME_BEGIN || \ | |
211 | reply[MSG_FRAME_END_POS] != MSG_FRAME_END || \ | |
212 | xor != reply[MSG_CHECKSUM_POS]) { | |
213 | sr_err("Message invalid [XOR, BEGIN/END]."); | |
214 | return SR_ERR; | |
215 | } | |
216 | ||
217 | /* Calculate values. */ | |
218 | sr_dbg("V: %02X %02X A: %02X %02X -- Limit %02X %02X", reply[4], | |
219 | reply[5], reply[2], reply[3], reply[10], reply[11]); | |
220 | ||
221 | voltage = decode_value(reply[4], reply[5], 1000.0); | |
222 | current = decode_value(reply[2], reply[3], 10000.0); | |
223 | current_limit = decode_value(reply[10], reply[11], 1000.0); | |
224 | ||
225 | sr_dbg("Voltage %f", voltage); | |
226 | sr_dbg("Current %f", current); | |
227 | sr_dbg("Current limit %f", current_limit); | |
228 | ||
229 | /* Begin frame. */ | |
230 | std_session_send_df_frame_begin(sdi); | |
231 | ||
232 | sr_analog_init(&analog, &encoding, &meaning, &spec, 4); | |
233 | ||
234 | packet.type = SR_DF_ANALOG; | |
235 | packet.payload = &analog; | |
236 | analog.num_samples = 1; | |
237 | ||
238 | /* Voltage */ | |
239 | l = g_slist_copy(sdi->channels); | |
240 | l = g_slist_remove_link(l, g_slist_nth(l, 1)); | |
241 | meaning.channels = l; | |
242 | meaning.mq = SR_MQ_VOLTAGE; | |
243 | meaning.mqflags = SR_MQFLAG_DC; | |
244 | meaning.unit = SR_UNIT_VOLT; | |
245 | analog.data = &voltage; | |
246 | sr_session_send(sdi, &packet); | |
247 | g_slist_free(l); | |
248 | ||
249 | /* Current */ | |
250 | l = g_slist_copy(sdi->channels); | |
251 | l = g_slist_remove_link(l, g_slist_nth(l, 0)); | |
252 | meaning.channels = l; | |
253 | meaning.mq = SR_MQ_CURRENT; | |
254 | meaning.mqflags = SR_MQFLAG_DC; | |
255 | meaning.unit = SR_UNIT_AMPERE; | |
256 | analog.data = ¤t; | |
257 | sr_session_send(sdi, &packet); | |
258 | g_slist_free(l); | |
259 | ||
260 | /* End frame. */ | |
261 | std_session_send_df_frame_end(sdi); | |
262 | ||
263 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
264 | if (sr_sw_limits_check(&devc->limits)) | |
265 | sr_dev_acquisition_stop(sdi); | |
266 | ||
267 | return TRUE; | |
268 | } | |
269 | ||
270 | SR_PRIV int ebd_get_current_limit(const struct sr_dev_inst *sdi, float *current) | |
271 | { | |
272 | struct dev_context *devc; | |
273 | ||
274 | if (!(devc = sdi->priv)) | |
275 | return SR_ERR; | |
276 | ||
277 | g_mutex_lock(&devc->rw_mutex); | |
278 | *current = devc->current_limit; | |
279 | g_mutex_unlock(&devc->rw_mutex); | |
280 | ||
281 | return SR_OK; | |
282 | } | |
283 | ||
284 | SR_PRIV int ebd_set_current_limit(const struct sr_dev_inst *sdi, float current) | |
285 | { | |
286 | struct dev_context *devc; | |
287 | int ret; | |
288 | ||
289 | if (!(devc = sdi->priv)) | |
290 | return SR_ERR; | |
291 | ||
292 | g_mutex_lock(&devc->rw_mutex); | |
293 | devc->current_limit = current; | |
294 | ||
295 | if (!devc->running) { | |
296 | sr_dbg("Setting current limit later."); | |
297 | g_mutex_unlock(&devc->rw_mutex); | |
298 | return SR_OK; | |
299 | } | |
300 | ||
301 | sr_dbg("Setting current limit to %fV.", current); | |
302 | ||
303 | if (devc->load_activated) { | |
304 | if (ebd_current_is0(devc)) { | |
305 | /* Stop load. */ | |
306 | ret = ebd_loadstop(sdi->conn, devc); | |
307 | } else { | |
308 | /* Send new current. */ | |
309 | ret = send_cfg(sdi->conn, devc); | |
310 | } | |
311 | } else { | |
312 | if (ebd_current_is0(devc)) { | |
313 | /* Nothing to do. */ | |
314 | ret = SR_OK; | |
315 | } else { | |
316 | /* Start load. */ | |
317 | ret = ebd_loadstart(sdi->conn, devc); | |
318 | } | |
319 | } | |
320 | ||
321 | g_mutex_unlock(&devc->rw_mutex); | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
326 | SR_PRIV gboolean ebd_current_is0(struct dev_context *devc) | |
327 | { | |
328 | return devc->current_limit < 0.001; | |
329 | } |