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/>.
30 * Get a temperature value from a four-character buffer. The value is
31 * encoded in ASCII and the unit is deci-degrees (tenths of degrees).
33 static float parse_temperature(unsigned char *buf)
41 for (i = 0; i < 4; i++) {
46 sr_dbg("Double negative sign!");
52 if (buf[i] < '0' || buf[i] > '9') {
53 sr_dbg("Invalid digit '%.2x'!", buf[i]);
66 static void process_packet(struct sr_dev_inst *sdi)
68 struct dev_context *devc;
69 struct sr_datafeed_packet packet;
70 struct sr_datafeed_analog analog;
71 struct sr_analog_encoding encoding;
72 struct sr_analog_meaning meaning;
73 struct sr_analog_spec spec;
80 sr_dbg("Received full 19-byte packet.");
81 if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
82 spew = g_string_sized_new(60);
83 for (i = 0; i < devc->packet_len; i++)
84 g_string_append_printf(spew, "%.2x ", devc->packet[i]);
85 sr_spew("%s", spew->str);
86 g_string_free(spew, TRUE);
90 if (devc->packet[1] == NEG && devc->packet[2] == NEG
91 && devc->packet[3] == NEG && devc->packet[4] == NEG)
92 /* No measurement: missing channel, empty storage location, ... */
95 temp = parse_temperature(devc->packet + 1);
100 sr_analog_init(&analog, &encoding, &meaning, &spec, 1);
101 analog.meaning->mq = SR_MQ_TEMPERATURE;
102 analog.meaning->mqflags = 0;
103 switch (devc->packet[5] - '0') {
105 analog.meaning->unit = SR_UNIT_CELSIUS;
108 analog.meaning->unit = SR_UNIT_FAHRENHEIT;
111 analog.meaning->unit = SR_UNIT_KELVIN;
114 /* We can still pass on the measurement, whatever it is. */
115 sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]);
117 switch (devc->packet[13] - '0') {
120 analog.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0));
124 analog.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1));
129 analog.meaning->channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2));
130 analog.meaning->mqflags |= SR_MQFLAG_RELATIVE;
133 sr_err("Unknown channel 0x%.2x.", devc->packet[13]);
137 analog.num_samples = 1;
139 packet.type = SR_DF_ANALOG;
140 packet.payload = &analog;
141 sr_session_send(sdi, &packet);
142 g_slist_free(analog.meaning->channels);
147 * We count packets even if the measurement was invalid. This way
148 * a sample limit on "Memory" data source still works: Unused
149 * memory slots come through as "----" measurements.
151 sr_sw_limits_update_samples_read(&devc->limits, 1);
152 if (sr_sw_limits_check(&devc->limits))
153 sr_dev_acquisition_stop(sdi);
156 SR_PRIV void LIBUSB_CALL uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer)
158 struct dev_context *devc;
159 struct sr_dev_inst *sdi;
160 int hid_payload_len, ret;
162 sdi = transfer->user_data;
164 if (transfer->actual_length == 8) {
165 /* CH9325 encodes length in low nibble of first byte, with
166 * bytes 1-7 being the (padded) payload. */
167 hid_payload_len = transfer->buffer[0] & 0x0f;
168 memcpy(devc->packet + devc->packet_len, transfer->buffer + 1,
170 devc->packet_len += hid_payload_len;
171 if (devc->packet_len >= 2
172 && devc->packet[devc->packet_len - 2] == SEP[0]
173 && devc->packet[devc->packet_len - 1] == SEP[1]) {
174 /* Got end of packet, but do we have a complete packet? */
175 if (devc->packet_len == PACKET_SIZE)
177 /* Either way, done with it. */
178 devc->packet_len = 0;
179 } else if (devc->packet_len > PACKET_SIZE) {
180 /* Guard against garbage from the device overrunning
181 * our packet buffer. */
182 sr_dbg("Buffer overrun!");
183 devc->packet_len = 0;
187 /* Get the next transfer (unless we're shutting down). */
188 if (sdi->status != SR_ST_STOPPING) {
189 if ((ret = libusb_submit_transfer(devc->xfer)) != 0) {
190 sr_dbg("Failed to resubmit transfer: %s", libusb_error_name(ret));
191 sdi->status = SR_ST_STOPPING;
192 libusb_free_transfer(devc->xfer);
195 libusb_free_transfer(devc->xfer);
199 SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data)
201 struct drv_context *drvc;
202 struct dev_context *devc;
203 struct sr_dev_driver *di;
204 struct sr_dev_inst *sdi;
205 struct sr_usb_dev_inst *usb;
208 unsigned char cmd[2];
213 if (!(sdi = cb_data))
219 if (!(devc = sdi->priv))
222 memset(&tv, 0, sizeof(struct timeval));
223 libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
226 if (sdi->status == SR_ST_STOPPING) {
227 usb_source_remove(sdi->session, drvc->sr_ctx);
228 std_session_send_df_end(sdi);
230 /* Tell the device to stop sending USB packets. */
234 ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
235 if (ret != 0 || len != 2) {
236 /* Warning only, doesn't matter. */
237 sr_dbg("Failed to send stop command: %s", libusb_error_name(ret));
240 sdi->status = SR_ST_ACTIVE;