2 * This file is part of the libsigrok project.
4 * Copyright (C) 2018 Sven Bursch-Osewold <sb_git@bursch.com>
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.
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.
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/>.
23 /* Log a byte-array as hex values. */
24 static void log_buf(const char *message, uint8_t buf[], size_t count)
26 char buffer[count * 2 + 1];
28 for (size_t j = 0; j < count; j++)
29 sprintf(&buffer[2 * j], "%02X", buf[j]);
31 buffer[count * 2] = 0;
33 sr_dbg("%s: %s [%lu bytes]", message, buffer, count);
36 /* Send a command to the device. */
37 static int send_cmd(struct sr_serial_dev_inst *serial, uint8_t buf[], size_t count)
41 log_buf("Sending", buf, count);
42 ret = serial_write_blocking(serial, buf, count, 0);
44 sr_err("Error sending command: %d.", ret);
47 sr_dbg("Sent %d bytes.", ret);
49 return (ret == (int)count) ? SR_OK : SR_ERR;
52 /* Decode high byte and low byte into a float. */
53 static float decode_value(uint8_t hi, uint8_t lo, float divisor)
55 return ((float)hi * 240.0 + (float)lo) / divisor;
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)
63 value = (int)(current * divisor);
64 sr_dbg("Value %d %d %d", value, value / 240, value % 240);
69 /* Send updated configuration values to the load. */
70 static int send_cfg(struct sr_serial_dev_inst *serial, struct dev_context *devc)
72 uint8_t send[] = { 0xfa, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8 };
74 encode_value(devc->current_limit, &send[2], &send[3], 1000.0);
76 send[8] = send[1] ^ send[2] ^ send[3] ^ send[4] ^ send[5] ^ \
79 return send_cmd(serial, send, 10);
82 /* Send the init/connect sequence; drive starts sending voltage and current. */
83 SR_PRIV int zketech_ebd_usb_init(struct sr_serial_dev_inst *serial,
84 struct dev_context *devc)
86 uint8_t init[] = { 0xfa, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0xf8 };
90 int ret = send_cmd(serial, init, 10);
97 /* Start the load functionality. */
98 SR_PRIV int zketech_ebd_usb_loadstart(struct sr_serial_dev_inst *serial,
99 struct dev_context *devc)
101 uint8_t start[] = { 0xfa, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xf8 };
104 ret = send_cmd(serial, start, 10);
105 sr_dbg("Current limit: %f.", devc->current_limit);
106 if (zketech_ebd_usb_current_is0(devc))
109 ret = send_cfg(serial, devc);
111 sr_dbg("Load activated.");
112 devc->load_activated = TRUE;
118 /* Stop the load functionality. */
119 SR_PRIV int zketech_ebd_usb_loadstop(struct sr_serial_dev_inst *serial,
120 struct dev_context *devc)
123 uint8_t stop[] = { 0xfa, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF8 };
125 ret = send_cmd(serial, stop, 10);
127 devc->load_activated = FALSE;
132 /* Stop the drive. */
133 SR_PRIV int zketech_ebd_usb_stop(struct sr_serial_dev_inst *serial,
134 struct dev_context *devc)
136 uint8_t stop[] = { 0xfa, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0xF8 };
141 ret = send_cmd(serial, stop, 10);
143 devc->load_activated = FALSE;
144 devc->running= FALSE;
150 /** Read count bytes from the serial connection. */
151 SR_PRIV int zketech_ebd_usb_read_chars(struct sr_serial_dev_inst *serial,
152 int count, uint8_t *buf)
154 int ret, received, turns;
160 ret = serial_read_blocking(serial, buf + received,
161 count - received, serial_timeout(serial, count));
163 sr_err("Error %d reading %d bytes.", ret, count);
168 } while ((received < count) && (turns < 100));
170 log_buf("Received", buf, received);
175 SR_PRIV int zketech_ebd_usb_receive_data(int fd, int revents, void *cb_data)
177 struct sr_dev_inst *sdi;
178 struct dev_context *devc;
179 struct sr_serial_dev_inst *serial;
180 struct sr_datafeed_packet packet;
181 struct sr_datafeed_analog analog;
182 struct sr_analog_encoding encoding;
183 struct sr_analog_meaning meaning;
184 struct sr_analog_spec spec;
185 float voltage, current, current_limit;
191 if (!(sdi = cb_data))
194 if (!(devc = sdi->priv))
199 uint8_t reply[MSG_LEN];
200 int ret = zketech_ebd_usb_read_chars(serial, MSG_LEN, reply);
202 /* Tests for correct message. */
203 if (ret != MSG_LEN) {
204 sr_err("Message invalid [Len].");
205 return (ret < 0) ? ret : SR_ERR;
208 uint8_t xor = reply[1] ^ reply[2] ^ reply[3] ^ reply[4] ^ \
209 reply[5] ^ reply[6] ^ reply[7] ^ reply[8] ^ \
210 reply[9] ^ reply[10] ^ reply[11] ^ reply[12] ^ \
211 reply[13] ^ reply[14] ^ reply[15] ^ reply[16];
213 if (reply[MSG_FRAME_BEGIN_POS] != MSG_FRAME_BEGIN || \
214 reply[MSG_FRAME_END_POS] != MSG_FRAME_END || \
215 xor != reply[MSG_CHECKSUM_POS]) {
216 sr_err("Message invalid [XOR, BEGIN/END].");
220 /* Calculate values. */
221 sr_dbg("V: %02X %02X A: %02X %02X -- Limit %02X %02X", reply[4],
222 reply[5], reply[2], reply[3], reply[10], reply[11]);
224 voltage = decode_value(reply[4], reply[5], 1000.0);
225 current = decode_value(reply[2], reply[3], 10000.0);
226 current_limit = decode_value(reply[10], reply[11], 1000.0);
228 sr_dbg("Voltage %f", voltage);
229 sr_dbg("Current %f", current);
230 sr_dbg("Current limit %f", current_limit);
233 packet.type = SR_DF_FRAME_BEGIN;
234 packet.payload = NULL;
235 sr_session_send(sdi, &packet);
237 sr_analog_init(&analog, &encoding, &meaning, &spec, 4);
239 packet.type = SR_DF_ANALOG;
240 packet.payload = &analog;
241 analog.num_samples = 1;
244 l = g_slist_copy(sdi->channels);
245 l = g_slist_remove_link(l, g_slist_nth(l, 1));
246 meaning.channels = l;
247 meaning.mq = SR_MQ_VOLTAGE;
248 meaning.mqflags = SR_MQFLAG_DC;
249 meaning.unit = SR_UNIT_VOLT;
250 analog.data = &voltage;
251 sr_session_send(sdi, &packet);
255 l = g_slist_copy(sdi->channels);
256 l = g_slist_remove_link(l, g_slist_nth(l, 0));
257 meaning.channels = l;
258 meaning.mq = SR_MQ_CURRENT;
259 meaning.mqflags = SR_MQFLAG_DC;
260 meaning.unit = SR_UNIT_AMPERE;
261 analog.data = ¤t;
262 sr_session_send(sdi, &packet);
266 packet.type = SR_DF_FRAME_END;
267 packet.payload = NULL;
268 sr_session_send(sdi, &packet);
270 sr_sw_limits_update_samples_read(&devc->limits, 1);
271 if (sr_sw_limits_check(&devc->limits))
272 sr_dev_acquisition_stop(sdi);
277 SR_PRIV int zketech_ebd_usb_get_current_limit(const struct sr_dev_inst *sdi,
280 struct dev_context *devc;
282 if (!(devc = sdi->priv))
285 g_mutex_lock(&devc->rw_mutex);
286 *current = devc->current_limit;
287 g_mutex_unlock(&devc->rw_mutex);
292 SR_PRIV int zketech_ebd_usb_set_current_limit(const struct sr_dev_inst *sdi,
295 struct dev_context *devc;
298 if (!(devc = sdi->priv))
301 g_mutex_lock(&devc->rw_mutex);
302 devc->current_limit = current;
304 if (!devc->running) {
305 sr_dbg("Setting current limit later.");
306 g_mutex_unlock(&devc->rw_mutex);
310 sr_dbg("Setting current limit to %fV.", current);
312 if (devc->load_activated) {
313 if (zketech_ebd_usb_current_is0(devc)) {
315 ret = zketech_ebd_usb_loadstop(sdi->conn, devc);
317 /* Send new current. */
318 ret = send_cfg(sdi->conn, devc);
321 if (zketech_ebd_usb_current_is0(devc)) {
326 ret = zketech_ebd_usb_loadstart(sdi->conn, devc);
330 g_mutex_unlock(&devc->rw_mutex);
335 SR_PRIV gboolean zketech_ebd_usb_current_is0(struct dev_context *devc)
337 return devc->current_limit < 0.001;