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;
27 static float parse_temperature(unsigned char *buf)
35 for (i = 0; i < 4; i++) {
40 sr_dbg("Double negative sign!");
47 if (buf[i] < 0x30 || buf[i] > 0x39) {
48 sr_dbg("Invalid digit '%.2x'!", buf[i]);
52 temp += (buf[i] - 0x30);
61 static void process_packet(struct sr_dev_inst *sdi)
63 struct dev_context *devc;
64 struct sr_datafeed_packet packet;
65 struct sr_datafeed_analog_old analog;
72 sr_dbg("Received full 19-byte packet.");
73 if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
74 spew = g_string_sized_new(60);
75 for (i = 0; i < devc->packet_len; i++)
76 g_string_append_printf(spew, "%.2x ", devc->packet[i]);
77 sr_spew("%s", spew->str);
78 g_string_free(spew, TRUE);
82 if (devc->packet[1] == 0x3b && devc->packet[2] == 0x3b
83 && devc->packet[3] == 0x3b && devc->packet[4] == 0x3b)
84 /* No measurement: missing channel, empty storage location, ... */
87 temp = parse_temperature(devc->packet + 1);
92 memset(&analog, 0, sizeof(struct sr_datafeed_analog_old));
93 analog.mq = SR_MQ_TEMPERATURE;
95 switch (devc->packet[5] - 0x30) {
97 analog.unit = SR_UNIT_CELSIUS;
100 analog.unit = SR_UNIT_FAHRENHEIT;
103 analog.unit = SR_UNIT_KELVIN;
106 /* We can still pass on the measurement, whatever it is. */
107 sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]);
109 switch (devc->packet[13] - 0x30) {
112 analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0));
116 analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1));
121 analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2));
122 analog.mqflags |= SR_MQFLAG_RELATIVE;
125 sr_err("Unknown channel 0x%.2x.", devc->packet[13]);
129 analog.num_samples = 1;
131 packet.type = SR_DF_ANALOG_OLD;
132 packet.payload = &analog;
133 sr_session_send(devc->cb_data, &packet);
134 g_slist_free(analog.channels);
138 /* We count packets even if the temperature was invalid. This way
139 * a sample limit on "Memory" data source still works: unused
140 * memory slots come through as "----" measurements. */
142 if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
143 sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)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_datafeed_packet packet;
199 struct sr_usb_dev_inst *usb;
202 unsigned char cmd[2];
207 if (!(sdi = cb_data))
213 if (!(devc = sdi->priv))
216 memset(&tv, 0, sizeof(struct timeval));
217 libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
220 if (sdi->status == SR_ST_STOPPING) {
221 usb_source_remove(sdi->session, drvc->sr_ctx);
222 packet.type = SR_DF_END;
223 sr_session_send(cb_data, &packet);
225 /* Tell the device to stop sending USB packets. */
229 ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
230 if (ret != 0 || len != 2) {
231 /* Warning only, doesn't matter. */
232 sr_dbg("Failed to send stop command: %s", libusb_error_name(ret));
235 sdi->status = SR_ST_ACTIVE;