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 static float parse_temperature(unsigned char *buf)
33 for (i = 0; i < 4; i++) {
38 sr_dbg("Double negative sign!");
45 if (buf[i] < 0x30 || buf[i] > 0x39) {
46 sr_dbg("Invalid digit '%.2x'!", buf[i]);
50 temp += (buf[i] - 0x30);
59 static void process_packet(struct sr_dev_inst *sdi)
61 struct dev_context *devc;
62 struct sr_datafeed_packet packet;
63 struct sr_datafeed_analog analog;
64 struct sr_analog_encoding encoding;
65 struct sr_analog_meaning meaning;
66 struct sr_analog_spec spec;
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 channel, empty storage location, ... */
88 temp = parse_temperature(devc->packet + 1);
93 sr_analog_init(&analog, &encoding, &meaning, &spec, 1);
94 analog.meaning->mq = SR_MQ_TEMPERATURE;
95 analog.meaning->mqflags = 0;
96 switch (devc->packet[5] - 0x30) {
98 analog.meaning->unit = SR_UNIT_CELSIUS;
101 analog.meaning->unit = SR_UNIT_FAHRENHEIT;
104 analog.meaning->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.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0));
117 analog.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1));
122 analog.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2));
123 analog.meaning->mqflags |= SR_MQFLAG_RELATIVE;
126 sr_err("Unknown channel 0x%.2x.", devc->packet[13]);
130 analog.num_samples = 1;
132 packet.type = SR_DF_ANALOG;
133 packet.payload = &analog;
134 sr_session_send(sdi, &packet);
135 g_slist_free(analog.meaning->channels);
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(sdi);
149 SR_PRIV void LIBUSB_CALL uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer)
151 struct dev_context *devc;
152 struct sr_dev_inst *sdi;
153 int hid_payload_len, ret;
155 sdi = transfer->user_data;
157 if (transfer->actual_length == 8) {
158 /* CH9325 encodes length in low nibble of first byte, with
159 * bytes 1-7 being the (padded) payload. */
160 hid_payload_len = transfer->buffer[0] & 0x0f;
161 memcpy(devc->packet + devc->packet_len, transfer->buffer + 1,
163 devc->packet_len += hid_payload_len;
164 if (devc->packet_len >= 2
165 && devc->packet[devc->packet_len - 2] == 0x0d
166 && devc->packet[devc->packet_len - 1] == 0x0a) {
167 /* Got end of packet, but do we have a complete packet? */
168 if (devc->packet_len == 19)
170 /* Either way, done with it. */
171 devc->packet_len = 0;
172 } else if (devc->packet_len > 19) {
173 /* Guard against garbage from the device overrunning
174 * our packet buffer. */
175 sr_dbg("Buffer overrun!");
176 devc->packet_len = 0;
180 /* Get the next transfer (unless we're shutting down). */
181 if (sdi->status != SR_ST_STOPPING) {
182 if ((ret = libusb_submit_transfer(devc->xfer)) != 0) {
183 sr_dbg("Failed to resubmit transfer: %s", libusb_error_name(ret));
184 sdi->status = SR_ST_STOPPING;
185 libusb_free_transfer(devc->xfer);
188 libusb_free_transfer(devc->xfer);
192 SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data)
194 struct drv_context *drvc;
195 struct dev_context *devc;
196 struct sr_dev_driver *di;
197 struct sr_dev_inst *sdi;
198 struct sr_usb_dev_inst *usb;
201 unsigned char cmd[2];
206 if (!(sdi = cb_data))
212 if (!(devc = sdi->priv))
215 memset(&tv, 0, sizeof(struct timeval));
216 libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
219 if (sdi->status == SR_ST_STOPPING) {
220 usb_source_remove(sdi->session, drvc->sr_ctx);
221 std_session_send_df_end(sdi);
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;