2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 Bert Vermeulen <bert@biot.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/>.
25 extern struct sr_dev_driver uni_t_ut32x_driver_info;
26 static struct sr_dev_driver *di = &uni_t_ut32x_driver_info;
28 static float parse_temperature(unsigned char *buf)
36 for (i = 0; i < 4; i++) {
41 sr_dbg("Double negative sign!");
48 if (buf[i] < 0x30 || buf[i] > 0x39) {
49 sr_dbg("Invalid digit '%.2x'!", buf[i]);
53 temp += (buf[i] - 0x30);
62 static void process_packet(struct sr_dev_inst *sdi)
64 struct dev_context *devc;
65 struct sr_datafeed_packet packet;
66 struct sr_datafeed_analog analog;
73 sr_dbg("Received full 19-byte packet.");
74 if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
75 spew = g_string_sized_new(60);
76 for (i = 0; i < devc->packet_len; i++)
77 g_string_append_printf(spew, "%.2x ", devc->packet[i]);
78 sr_spew("%s", spew->str);
79 g_string_free(spew, TRUE);
83 if (devc->packet[1] == 0x3b && devc->packet[2] == 0x3b
84 && devc->packet[3] == 0x3b && devc->packet[4] == 0x3b)
85 /* No measurement: missing probe, empty storage location, ... */
88 temp = parse_temperature(devc->packet + 1);
93 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
94 analog.mq = SR_MQ_TEMPERATURE;
96 switch (devc->packet[5] - 0x30) {
98 analog.unit = SR_UNIT_CELSIUS;
101 analog.unit = SR_UNIT_FAHRENHEIT;
104 analog.unit = SR_UNIT_KELVIN;
107 /* We can still pass on the measurement, whatever it is. */
108 sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]);
110 switch (devc->packet[13] - 0x30) {
113 analog.probes = g_slist_append(NULL, g_slist_nth_data(sdi->probes, 0));
117 analog.probes = g_slist_append(NULL, g_slist_nth_data(sdi->probes, 1));
122 analog.probes = g_slist_append(NULL, g_slist_nth_data(sdi->probes, 2));
123 analog.mqflags |= SR_MQFLAG_RELATIVE;
126 sr_err("Unknown probe 0x%.2x.", devc->packet[13]);
130 analog.num_samples = 1;
132 packet.type = SR_DF_ANALOG;
133 packet.payload = &analog;
134 sr_session_send(devc->cb_data, &packet);
135 g_slist_free(analog.probes);
139 /* We count packets even if the temperature was invalid. This way
140 * a sample limit on "Memory" data source still works: unused
141 * memory slots come through as "----" measurements. */
143 if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
144 sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
150 SR_PRIV void uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer)
152 struct dev_context *devc;
153 struct sr_dev_inst *sdi;
154 int hid_payload_len, ret;
156 sdi = transfer->user_data;
158 if (transfer->actual_length == 8) {
159 /* CH9325 encodes length in low nibble of first byte, with
160 * bytes 1-7 being the (padded) payload. */
161 hid_payload_len = transfer->buffer[0] & 0x0f;
162 memcpy(devc->packet + devc->packet_len, transfer->buffer + 1,
164 devc->packet_len += hid_payload_len;
165 if (devc->packet_len >= 2
166 && devc->packet[devc->packet_len - 2] == 0x0d
167 && devc->packet[devc->packet_len - 1] == 0x0a) {
168 /* Got end of packet, but do we have a complete packet? */
169 if (devc->packet_len == 19)
171 /* Either way, done with it. */
172 devc->packet_len = 0;
173 } else if (devc->packet_len > 19) {
174 /* Guard against garbage from the device overrunning
175 * our packet buffer. */
176 sr_dbg("Buffer overrun!");
177 devc->packet_len = 0;
181 /* Get the next transfer (unless we're shutting down). */
182 if (sdi->status != SR_ST_STOPPING) {
183 if ((ret = libusb_submit_transfer(devc->xfer)) != 0) {
184 sr_dbg("Failed to resubmit transfer: %s", libusb_error_name(ret));
185 sdi->status = SR_ST_STOPPING;
186 libusb_free_transfer(devc->xfer);
189 libusb_free_transfer(devc->xfer);
193 SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data)
195 struct drv_context *drvc;
196 struct dev_context *devc;
197 struct sr_dev_inst *sdi;
198 struct sr_datafeed_packet packet;
199 struct sr_usb_dev_inst *usb;
202 unsigned char cmd[2];
208 if (!(sdi = cb_data))
211 if (!(devc = sdi->priv))
214 memset(&tv, 0, sizeof(struct timeval));
215 libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
218 if (sdi->status == SR_ST_STOPPING) {
219 usb_source_remove(drvc->sr_ctx);
220 packet.type = SR_DF_END;
221 sr_session_send(cb_data, &packet);
223 /* Tell the device to stop sending USB packets. */
227 ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
228 if (ret != 0 || len != 2) {
229 /* Warning only, doesn't matter. */
230 sr_dbg("Failed to send stop command: %s", libusb_error_name(ret));
233 sdi->status = SR_ST_ACTIVE;