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c527132a SBO |
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 | ||
cb8a0efc UH |
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 [%lu bytes]", message, buffer, count); | |
34 | } | |
35 | ||
9890fb1f | 36 | /* Send a command to the device. */ |
cb8a0efc | 37 | static int send_cmd(struct sr_serial_dev_inst *serial, uint8_t buf[], size_t count) |
9890fb1f SBO |
38 | { |
39 | int ret; | |
40 | ||
cb8a0efc | 41 | log_buf("Sending", buf, count); |
9890fb1f SBO |
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 | sr_dbg("Sent %d bytes.", ret); | |
48 | ||
49 | return (ret == (int)count) ? SR_OK : SR_ERR; | |
50 | } | |
51 | ||
cb8a0efc UH |
52 | /* Decode high byte and low byte into a float. */ |
53 | static float decode_value(uint8_t hi, uint8_t lo, float divisor) | |
54 | { | |
55 | return ((float)hi * 240.0 + (float)lo) / divisor; | |
56 | } | |
57 | ||
58 | /* Encode a float into high byte and low byte. */ | |
59 | static void encode_value(float current, uint8_t *hi, uint8_t *lo, float divisor) | |
60 | { | |
61 | int value; | |
62 | ||
63 | value = (int)(current * divisor); | |
64 | sr_dbg("Value %d %d %d", value, value / 240, value % 240); | |
65 | *hi = value / 240; | |
66 | *lo = value % 240; | |
67 | } | |
68 | ||
69 | /* Send updated configuration values to the load. */ | |
70 | static int send_cfg(struct sr_serial_dev_inst *serial, struct dev_context *devc) | |
71 | { | |
72 | uint8_t send[] = { 0xfa, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8 }; | |
73 | ||
74 | encode_value(devc->current_limit, &send[2], &send[3], 1000.0); | |
75 | ||
76 | send[8] = send[1] ^ send[2] ^ send[3] ^ send[4] ^ send[5] ^ \ | |
77 | send[6] ^ send[7]; | |
78 | ||
79 | return send_cmd(serial, send, 10); | |
80 | } | |
81 | ||
9890fb1f | 82 | /* Send the init/connect sequence; drive starts sending voltage and current. */ |
330a32b2 | 83 | SR_PRIV int ebd_init(struct sr_serial_dev_inst *serial, struct dev_context *devc) |
9890fb1f SBO |
84 | { |
85 | uint8_t init[] = { 0xfa, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0xf8 }; | |
86 | ||
87 | (void)devc; | |
88 | ||
cb8a0efc | 89 | int ret = send_cmd(serial, init, 10); |
9890fb1f SBO |
90 | if (ret == SR_OK) |
91 | devc->running = TRUE; | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | /* Start the load functionality. */ | |
330a32b2 | 97 | SR_PRIV int ebd_loadstart(struct sr_serial_dev_inst *serial, struct dev_context *devc) |
9890fb1f SBO |
98 | { |
99 | uint8_t start[] = { 0xfa, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xf8 }; | |
100 | int ret; | |
101 | ||
cb8a0efc | 102 | ret = send_cmd(serial, start, 10); |
9890fb1f | 103 | sr_dbg("Current limit: %f.", devc->current_limit); |
330a32b2 | 104 | if (ebd_current_is0(devc)) |
9890fb1f SBO |
105 | return SR_OK; |
106 | ||
cb8a0efc | 107 | ret = send_cfg(serial, devc); |
9890fb1f SBO |
108 | if (ret == SR_OK) { |
109 | sr_dbg("Load activated."); | |
110 | devc->load_activated = TRUE; | |
111 | } | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
116 | /* Stop the load functionality. */ | |
330a32b2 | 117 | SR_PRIV int ebd_loadstop(struct sr_serial_dev_inst *serial, struct dev_context *devc) |
9890fb1f SBO |
118 | { |
119 | int ret; | |
120 | uint8_t stop[] = { 0xfa, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF8 }; | |
121 | ||
cb8a0efc | 122 | ret = send_cmd(serial, stop, 10); |
9890fb1f SBO |
123 | if (ret == SR_OK) |
124 | devc->load_activated = FALSE; | |
125 | ||
126 | return ret; | |
127 | } | |
128 | ||
129 | /* Stop the drive. */ | |
330a32b2 | 130 | SR_PRIV int ebd_stop(struct sr_serial_dev_inst *serial, struct dev_context *devc) |
9890fb1f SBO |
131 | { |
132 | uint8_t stop[] = { 0xfa, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0xF8 }; | |
133 | int ret; | |
134 | ||
135 | (void) devc; | |
136 | ||
cb8a0efc | 137 | ret = send_cmd(serial, stop, 10); |
9890fb1f SBO |
138 | if (ret == SR_OK) { |
139 | devc->load_activated = FALSE; | |
140 | devc->running= FALSE; | |
141 | } | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
9890fb1f | 146 | /** Read count bytes from the serial connection. */ |
330a32b2 | 147 | SR_PRIV int ebd_read_chars(struct sr_serial_dev_inst *serial, int count, uint8_t *buf) |
9890fb1f SBO |
148 | { |
149 | int ret, received, turns; | |
150 | ||
151 | received = 0; | |
152 | turns = 0; | |
153 | ||
154 | do { | |
155 | ret = serial_read_blocking(serial, buf + received, | |
156 | count - received, serial_timeout(serial, count)); | |
157 | if (ret < 0) { | |
158 | sr_err("Error %d reading %d bytes.", ret, count); | |
159 | return ret; | |
160 | } | |
161 | received += ret; | |
162 | turns++; | |
163 | } while ((received < count) && (turns < 100)); | |
164 | ||
cb8a0efc | 165 | log_buf("Received", buf, received); |
9890fb1f SBO |
166 | |
167 | return received; | |
168 | } | |
169 | ||
330a32b2 | 170 | SR_PRIV int ebd_receive_data(int fd, int revents, void *cb_data) |
c527132a | 171 | { |
9890fb1f | 172 | struct sr_dev_inst *sdi; |
c527132a | 173 | struct dev_context *devc; |
9890fb1f SBO |
174 | struct sr_serial_dev_inst *serial; |
175 | struct sr_datafeed_packet packet; | |
176 | struct sr_datafeed_analog analog; | |
177 | struct sr_analog_encoding encoding; | |
178 | struct sr_analog_meaning meaning; | |
179 | struct sr_analog_spec spec; | |
180 | float voltage, current, current_limit; | |
181 | GSList *l; | |
c527132a | 182 | |
9890fb1f | 183 | (void)revents; |
c527132a SBO |
184 | (void)fd; |
185 | ||
186 | if (!(sdi = cb_data)) | |
9890fb1f | 187 | return FALSE; |
c527132a SBO |
188 | |
189 | if (!(devc = sdi->priv)) | |
9890fb1f SBO |
190 | return FALSE; |
191 | ||
192 | serial = sdi->conn; | |
193 | ||
ec4806dc | 194 | uint8_t reply[MSG_LEN]; |
330a32b2 | 195 | int ret = ebd_read_chars(serial, MSG_LEN, reply); |
9890fb1f SBO |
196 | |
197 | /* Tests for correct message. */ | |
ec4806dc | 198 | if (ret != MSG_LEN) { |
9890fb1f SBO |
199 | sr_err("Message invalid [Len]."); |
200 | return (ret < 0) ? ret : SR_ERR; | |
201 | } | |
c527132a | 202 | |
9890fb1f SBO |
203 | uint8_t xor = reply[1] ^ reply[2] ^ reply[3] ^ reply[4] ^ \ |
204 | reply[5] ^ reply[6] ^ reply[7] ^ reply[8] ^ \ | |
205 | reply[9] ^ reply[10] ^ reply[11] ^ reply[12] ^ \ | |
206 | reply[13] ^ reply[14] ^ reply[15] ^ reply[16]; | |
207 | ||
ec4806dc UH |
208 | if (reply[MSG_FRAME_BEGIN_POS] != MSG_FRAME_BEGIN || \ |
209 | reply[MSG_FRAME_END_POS] != MSG_FRAME_END || \ | |
210 | xor != reply[MSG_CHECKSUM_POS]) { | |
9890fb1f SBO |
211 | sr_err("Message invalid [XOR, BEGIN/END]."); |
212 | return SR_ERR; | |
c527132a SBO |
213 | } |
214 | ||
9890fb1f SBO |
215 | /* Calculate values. */ |
216 | sr_dbg("V: %02X %02X A: %02X %02X -- Limit %02X %02X", reply[4], | |
217 | reply[5], reply[2], reply[3], reply[10], reply[11]); | |
218 | ||
cb8a0efc UH |
219 | voltage = decode_value(reply[4], reply[5], 1000.0); |
220 | current = decode_value(reply[2], reply[3], 10000.0); | |
221 | current_limit = decode_value(reply[10], reply[11], 1000.0); | |
9890fb1f SBO |
222 | |
223 | sr_dbg("Voltage %f", voltage); | |
224 | sr_dbg("Current %f", current); | |
225 | sr_dbg("Current limit %f", current_limit); | |
226 | ||
227 | /* Begin frame. */ | |
228 | packet.type = SR_DF_FRAME_BEGIN; | |
229 | packet.payload = NULL; | |
230 | sr_session_send(sdi, &packet); | |
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 | packet.type = SR_DF_FRAME_END; | |
262 | packet.payload = NULL; | |
263 | sr_session_send(sdi, &packet); | |
264 | ||
265 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
266 | if (sr_sw_limits_check(&devc->limits)) | |
267 | sr_dev_acquisition_stop(sdi); | |
268 | ||
c527132a SBO |
269 | return TRUE; |
270 | } | |
9890fb1f | 271 | |
330a32b2 | 272 | SR_PRIV int ebd_get_current_limit(const struct sr_dev_inst *sdi, float *current) |
9890fb1f SBO |
273 | { |
274 | struct dev_context *devc; | |
275 | ||
276 | if (!(devc = sdi->priv)) | |
277 | return SR_ERR; | |
278 | ||
279 | g_mutex_lock(&devc->rw_mutex); | |
280 | *current = devc->current_limit; | |
281 | g_mutex_unlock(&devc->rw_mutex); | |
282 | ||
283 | return SR_OK; | |
284 | } | |
285 | ||
330a32b2 | 286 | SR_PRIV int ebd_set_current_limit(const struct sr_dev_inst *sdi, float current) |
9890fb1f SBO |
287 | { |
288 | struct dev_context *devc; | |
289 | int ret; | |
290 | ||
291 | if (!(devc = sdi->priv)) | |
292 | return SR_ERR; | |
293 | ||
294 | g_mutex_lock(&devc->rw_mutex); | |
295 | devc->current_limit = current; | |
296 | ||
297 | if (!devc->running) { | |
298 | sr_dbg("Setting current limit later."); | |
299 | g_mutex_unlock(&devc->rw_mutex); | |
300 | return SR_OK; | |
301 | } | |
302 | ||
303 | sr_dbg("Setting current limit to %fV.", current); | |
304 | ||
305 | if (devc->load_activated) { | |
330a32b2 | 306 | if (ebd_current_is0(devc)) { |
9890fb1f | 307 | /* Stop load. */ |
330a32b2 | 308 | ret = ebd_loadstop(sdi->conn, devc); |
9890fb1f SBO |
309 | } else { |
310 | /* Send new current. */ | |
cb8a0efc | 311 | ret = send_cfg(sdi->conn, devc); |
9890fb1f SBO |
312 | } |
313 | } else { | |
330a32b2 | 314 | if (ebd_current_is0(devc)) { |
9890fb1f SBO |
315 | /* Nothing to do. */ |
316 | ret = SR_OK; | |
317 | } else { | |
318 | /* Start load. */ | |
330a32b2 | 319 | ret = ebd_loadstart(sdi->conn, devc); |
9890fb1f SBO |
320 | } |
321 | } | |
322 | ||
323 | g_mutex_unlock(&devc->rw_mutex); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | ||
330a32b2 | 328 | SR_PRIV gboolean ebd_current_is0(struct dev_context *devc) |
9890fb1f SBO |
329 | { |
330 | return devc->current_limit < 0.001; | |
331 | } |