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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 | ||
9890fb1f SBO |
23 | /* Send a command to the device. */ |
24 | SR_PRIV int zketech_ebd_usb_send(struct sr_serial_dev_inst *serial, | |
25 | uint8_t buf[], size_t count) | |
26 | { | |
27 | int ret; | |
28 | ||
29 | zketech_ebd_usb_buffer_debug("Sending", buf, count); | |
30 | ret = serial_write_blocking(serial, buf, count, 0); | |
31 | if (ret < 0) { | |
32 | sr_err("Error sending command: %d.", ret); | |
33 | return ret; | |
34 | } | |
35 | sr_dbg("Sent %d bytes.", ret); | |
36 | ||
37 | return (ret == (int)count) ? SR_OK : SR_ERR; | |
38 | } | |
39 | ||
40 | /* Send the init/connect sequence; drive starts sending voltage and current. */ | |
41 | SR_PRIV int zketech_ebd_usb_init(struct sr_serial_dev_inst *serial, | |
42 | struct dev_context *devc) | |
43 | { | |
44 | uint8_t init[] = { 0xfa, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0xf8 }; | |
45 | ||
46 | (void)devc; | |
47 | ||
48 | int ret = zketech_ebd_usb_send(serial, init, 10); | |
49 | if (ret == SR_OK) | |
50 | devc->running = TRUE; | |
51 | ||
52 | return ret; | |
53 | } | |
54 | ||
55 | /* Start the load functionality. */ | |
56 | SR_PRIV int zketech_ebd_usb_loadstart(struct sr_serial_dev_inst *serial, | |
57 | struct dev_context *devc) | |
58 | { | |
59 | uint8_t start[] = { 0xfa, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xf8 }; | |
60 | int ret; | |
61 | ||
62 | ret = zketech_ebd_usb_send(serial, start, 10); | |
63 | sr_dbg("Current limit: %f.", devc->current_limit); | |
64 | if (zketech_ebd_usb_current_is0(devc)) | |
65 | return SR_OK; | |
66 | ||
67 | ret = zketech_ebd_usb_sendcfg(serial, devc); | |
68 | if (ret == SR_OK) { | |
69 | sr_dbg("Load activated."); | |
70 | devc->load_activated = TRUE; | |
71 | } | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
76 | /* Stop the load functionality. */ | |
77 | SR_PRIV int zketech_ebd_usb_loadstop(struct sr_serial_dev_inst *serial, | |
78 | struct dev_context *devc) | |
79 | { | |
80 | int ret; | |
81 | uint8_t stop[] = { 0xfa, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF8 }; | |
82 | ||
83 | ret = zketech_ebd_usb_send(serial, stop, 10); | |
84 | if (ret == SR_OK) | |
85 | devc->load_activated = FALSE; | |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
90 | /* Stop the drive. */ | |
91 | SR_PRIV int zketech_ebd_usb_stop(struct sr_serial_dev_inst *serial, | |
92 | struct dev_context *devc) | |
93 | { | |
94 | uint8_t stop[] = { 0xfa, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0xF8 }; | |
95 | int ret; | |
96 | ||
97 | (void) devc; | |
98 | ||
99 | ret = zketech_ebd_usb_send(serial, stop, 10); | |
100 | if (ret == SR_OK) { | |
101 | devc->load_activated = FALSE; | |
102 | devc->running= FALSE; | |
103 | } | |
104 | ||
105 | return ret; | |
106 | } | |
107 | ||
108 | /* Send updated configuration values to the load. */ | |
109 | SR_PRIV int zketech_ebd_usb_sendcfg(struct sr_serial_dev_inst *serial, | |
110 | struct dev_context *devc) | |
111 | { | |
112 | uint8_t send[] = { 0xfa, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8 }; | |
113 | ||
114 | zketech_ebd_usb_value_encode(devc->current_limit, &send[2], | |
115 | &send[3], 1000.0); | |
116 | ||
117 | send[8] = send[1] ^ send[2] ^ send[3] ^ send[4] ^ send[5] ^ \ | |
118 | send[6] ^ send[7]; | |
119 | ||
120 | return zketech_ebd_usb_send(serial, send, 10); | |
121 | } | |
122 | ||
123 | /** Read count bytes from the serial connection. */ | |
124 | SR_PRIV int zketech_ebd_usb_read_chars(struct sr_serial_dev_inst *serial, | |
125 | int count, uint8_t *buf) | |
126 | { | |
127 | int ret, received, turns; | |
128 | ||
129 | received = 0; | |
130 | turns = 0; | |
131 | ||
132 | do { | |
133 | ret = serial_read_blocking(serial, buf + received, | |
134 | count - received, serial_timeout(serial, count)); | |
135 | if (ret < 0) { | |
136 | sr_err("Error %d reading %d bytes.", ret, count); | |
137 | return ret; | |
138 | } | |
139 | received += ret; | |
140 | turns++; | |
141 | } while ((received < count) && (turns < 100)); | |
142 | ||
143 | zketech_ebd_usb_buffer_debug("Received", buf, received); | |
144 | ||
145 | return received; | |
146 | } | |
147 | ||
148 | /* Decode high byte and low byte into a float. */ | |
149 | SR_PRIV float zketech_ebd_usb_value_decode(uint8_t hi, uint8_t lo, float divisor) | |
150 | { | |
151 | return ((float)hi * 240.0 + (float)lo) / divisor; | |
152 | } | |
153 | ||
154 | /* Encode a float into high byte and low byte. */ | |
155 | SR_PRIV void zketech_ebd_usb_value_encode(float current, uint8_t *hi, | |
156 | uint8_t *lo, float divisor) | |
157 | { | |
158 | int value; | |
159 | ||
160 | value = (int)(current * divisor); | |
161 | sr_dbg("Value %d %d %d", value, value / 240, value % 240); | |
162 | *hi = value / 240; | |
163 | *lo = value % 240; | |
164 | } | |
165 | ||
c527132a SBO |
166 | SR_PRIV int zketech_ebd_usb_receive_data(int fd, int revents, void *cb_data) |
167 | { | |
9890fb1f | 168 | struct sr_dev_inst *sdi; |
c527132a | 169 | struct dev_context *devc; |
9890fb1f SBO |
170 | struct sr_serial_dev_inst *serial; |
171 | struct sr_datafeed_packet packet; | |
172 | struct sr_datafeed_analog analog; | |
173 | struct sr_analog_encoding encoding; | |
174 | struct sr_analog_meaning meaning; | |
175 | struct sr_analog_spec spec; | |
176 | float voltage, current, current_limit; | |
177 | GSList *l; | |
c527132a | 178 | |
9890fb1f | 179 | (void)revents; |
c527132a SBO |
180 | (void)fd; |
181 | ||
182 | if (!(sdi = cb_data)) | |
9890fb1f | 183 | return FALSE; |
c527132a SBO |
184 | |
185 | if (!(devc = sdi->priv)) | |
9890fb1f SBO |
186 | return FALSE; |
187 | ||
188 | serial = sdi->conn; | |
189 | ||
ec4806dc UH |
190 | uint8_t reply[MSG_LEN]; |
191 | int ret = zketech_ebd_usb_read_chars(serial, MSG_LEN, reply); | |
9890fb1f SBO |
192 | |
193 | /* Tests for correct message. */ | |
ec4806dc | 194 | if (ret != MSG_LEN) { |
9890fb1f SBO |
195 | sr_err("Message invalid [Len]."); |
196 | return (ret < 0) ? ret : SR_ERR; | |
197 | } | |
c527132a | 198 | |
9890fb1f SBO |
199 | uint8_t xor = reply[1] ^ reply[2] ^ reply[3] ^ reply[4] ^ \ |
200 | reply[5] ^ reply[6] ^ reply[7] ^ reply[8] ^ \ | |
201 | reply[9] ^ reply[10] ^ reply[11] ^ reply[12] ^ \ | |
202 | reply[13] ^ reply[14] ^ reply[15] ^ reply[16]; | |
203 | ||
ec4806dc UH |
204 | if (reply[MSG_FRAME_BEGIN_POS] != MSG_FRAME_BEGIN || \ |
205 | reply[MSG_FRAME_END_POS] != MSG_FRAME_END || \ | |
206 | xor != reply[MSG_CHECKSUM_POS]) { | |
9890fb1f SBO |
207 | sr_err("Message invalid [XOR, BEGIN/END]."); |
208 | return SR_ERR; | |
c527132a SBO |
209 | } |
210 | ||
9890fb1f SBO |
211 | /* Calculate values. */ |
212 | sr_dbg("V: %02X %02X A: %02X %02X -- Limit %02X %02X", reply[4], | |
213 | reply[5], reply[2], reply[3], reply[10], reply[11]); | |
214 | ||
215 | voltage = zketech_ebd_usb_value_decode(reply[4], reply[5], 1000.0); | |
216 | current = zketech_ebd_usb_value_decode(reply[2], reply[3], 10000.0); | |
217 | current_limit = zketech_ebd_usb_value_decode(reply[10], reply[11], 1000.0); | |
218 | ||
219 | sr_dbg("Voltage %f", voltage); | |
220 | sr_dbg("Current %f", current); | |
221 | sr_dbg("Current limit %f", current_limit); | |
222 | ||
223 | /* Begin frame. */ | |
224 | packet.type = SR_DF_FRAME_BEGIN; | |
225 | packet.payload = NULL; | |
226 | sr_session_send(sdi, &packet); | |
227 | ||
228 | sr_analog_init(&analog, &encoding, &meaning, &spec, 4); | |
229 | ||
230 | packet.type = SR_DF_ANALOG; | |
231 | packet.payload = &analog; | |
232 | analog.num_samples = 1; | |
233 | ||
234 | /* Voltage */ | |
235 | l = g_slist_copy(sdi->channels); | |
236 | l = g_slist_remove_link(l, g_slist_nth(l, 1)); | |
237 | meaning.channels = l; | |
238 | meaning.mq = SR_MQ_VOLTAGE; | |
239 | meaning.mqflags = SR_MQFLAG_DC; | |
240 | meaning.unit = SR_UNIT_VOLT; | |
241 | analog.data = &voltage; | |
242 | sr_session_send(sdi, &packet); | |
243 | g_slist_free(l); | |
244 | ||
245 | /* Current */ | |
246 | l = g_slist_copy(sdi->channels); | |
247 | l = g_slist_remove_link(l, g_slist_nth(l, 0)); | |
248 | meaning.channels = l; | |
249 | meaning.mq = SR_MQ_CURRENT; | |
250 | meaning.mqflags = SR_MQFLAG_DC; | |
251 | meaning.unit = SR_UNIT_AMPERE; | |
252 | analog.data = ¤t; | |
253 | sr_session_send(sdi, &packet); | |
254 | g_slist_free(l); | |
255 | ||
256 | /* End frame. */ | |
257 | packet.type = SR_DF_FRAME_END; | |
258 | packet.payload = NULL; | |
259 | sr_session_send(sdi, &packet); | |
260 | ||
261 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
262 | if (sr_sw_limits_check(&devc->limits)) | |
263 | sr_dev_acquisition_stop(sdi); | |
264 | ||
c527132a SBO |
265 | return TRUE; |
266 | } | |
9890fb1f SBO |
267 | |
268 | SR_PRIV int zketech_ebd_usb_get_current_limit(const struct sr_dev_inst *sdi, | |
269 | float *current) | |
270 | { | |
271 | struct dev_context *devc; | |
272 | ||
273 | if (!(devc = sdi->priv)) | |
274 | return SR_ERR; | |
275 | ||
276 | g_mutex_lock(&devc->rw_mutex); | |
277 | *current = devc->current_limit; | |
278 | g_mutex_unlock(&devc->rw_mutex); | |
279 | ||
280 | return SR_OK; | |
281 | } | |
282 | ||
283 | SR_PRIV int zketech_ebd_usb_set_current_limit(const struct sr_dev_inst *sdi, | |
284 | 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 (zketech_ebd_usb_current_is0(devc)) { | |
305 | /* Stop load. */ | |
306 | ret = zketech_ebd_usb_loadstop(sdi->conn, devc); | |
307 | } else { | |
308 | /* Send new current. */ | |
309 | ret = zketech_ebd_usb_sendcfg(sdi->conn, devc); | |
310 | } | |
311 | } else { | |
312 | if (zketech_ebd_usb_current_is0(devc)) { | |
313 | /* Nothing to do. */ | |
314 | ret = SR_OK; | |
315 | } else { | |
316 | /* Start load. */ | |
317 | ret = zketech_ebd_usb_loadstart(sdi->conn, devc); | |
318 | } | |
319 | } | |
320 | ||
321 | g_mutex_unlock(&devc->rw_mutex); | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
326 | SR_PRIV gboolean zketech_ebd_usb_current_is0(struct dev_context *devc) | |
327 | { | |
328 | return devc->current_limit < 0.001; | |
329 | } | |
330 | ||
331 | /* Log a byte-array as hex values. */ | |
332 | SR_PRIV void zketech_ebd_usb_buffer_debug(const char *message, uint8_t buf[], | |
333 | size_t count) | |
334 | { | |
335 | char buffer[count * 2 + 1]; | |
336 | ||
337 | for (size_t j = 0; j < count; j++) | |
338 | sprintf(&buffer[2 * j], "%02X", buf[j]); | |
339 | ||
340 | buffer[count * 2] = 0; | |
341 | ||
342 | sr_dbg("%s: %s [%lu bytes]", message, buffer, count); | |
343 | } |