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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 Bert Vermeulen <bert@biot.com> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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/>. | |
18 | */ | |
19 | ||
20 | #include "protocol.h" | |
21 | ||
22 | #include <string.h> | |
23 | #include <math.h> | |
24 | ||
25 | extern struct sr_dev_driver uni_t_ut32x_driver_info; | |
26 | ||
27 | static float parse_temperature(unsigned char *buf) | |
28 | { | |
29 | float temp; | |
30 | int i; | |
31 | gboolean negative; | |
32 | ||
33 | negative = FALSE; | |
34 | temp = 0.0; | |
35 | for (i = 0; i < 4; i++) { | |
36 | if (buf[i] == 0x3a) | |
37 | continue; | |
38 | if (buf[i] == 0x3b) { | |
39 | if (negative) { | |
40 | sr_dbg("Double negative sign!"); | |
41 | return NAN; | |
42 | } else { | |
43 | negative = TRUE; | |
44 | continue; | |
45 | } | |
46 | } | |
47 | if (buf[i] < 0x30 || buf[i] > 0x39) { | |
48 | sr_dbg("Invalid digit '%.2x'!", buf[i]); | |
49 | return NAN; | |
50 | } | |
51 | temp *= 10; | |
52 | temp += (buf[i] - 0x30); | |
53 | } | |
54 | temp /= 10; | |
55 | if (negative) | |
56 | temp = -temp; | |
57 | ||
58 | return temp; | |
59 | } | |
60 | ||
61 | static void process_packet(struct sr_dev_inst *sdi) | |
62 | { | |
63 | struct dev_context *devc; | |
64 | struct sr_datafeed_packet packet; | |
65 | struct sr_datafeed_analog analog; | |
66 | GString *spew; | |
67 | float temp; | |
68 | int i; | |
69 | gboolean is_valid; | |
70 | ||
71 | devc = sdi->priv; | |
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); | |
79 | } | |
80 | ||
81 | is_valid = 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, ... */ | |
85 | is_valid = FALSE; | |
86 | ||
87 | temp = parse_temperature(devc->packet + 1); | |
88 | if (isnan(temp)) | |
89 | is_valid = FALSE; | |
90 | ||
91 | if (is_valid) { | |
92 | memset(&analog, 0, sizeof(struct sr_datafeed_analog)); | |
93 | analog.mq = SR_MQ_TEMPERATURE; | |
94 | analog.mqflags = 0; | |
95 | switch (devc->packet[5] - 0x30) { | |
96 | case 1: | |
97 | analog.unit = SR_UNIT_CELSIUS; | |
98 | break; | |
99 | case 2: | |
100 | analog.unit = SR_UNIT_FAHRENHEIT; | |
101 | break; | |
102 | case 3: | |
103 | analog.unit = SR_UNIT_KELVIN; | |
104 | break; | |
105 | default: | |
106 | /* We can still pass on the measurement, whatever it is. */ | |
107 | sr_dbg("Unknown unit 0x%.2x.", devc->packet[5]); | |
108 | } | |
109 | switch (devc->packet[13] - 0x30) { | |
110 | case 0: | |
111 | /* Channel T1. */ | |
112 | analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 0)); | |
113 | break; | |
114 | case 1: | |
115 | /* Channel T2. */ | |
116 | analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 1)); | |
117 | break; | |
118 | case 2: | |
119 | case 3: | |
120 | /* Channel T1-T2. */ | |
121 | analog.channels = g_slist_append(NULL, g_slist_nth_data(sdi->channels, 2)); | |
122 | analog.mqflags |= SR_MQFLAG_RELATIVE; | |
123 | break; | |
124 | default: | |
125 | sr_err("Unknown channel 0x%.2x.", devc->packet[13]); | |
126 | is_valid = FALSE; | |
127 | } | |
128 | if (is_valid) { | |
129 | analog.num_samples = 1; | |
130 | analog.data = &temp; | |
131 | packet.type = SR_DF_ANALOG; | |
132 | packet.payload = &analog; | |
133 | sr_session_send(devc->cb_data, &packet); | |
134 | g_slist_free(analog.channels); | |
135 | } | |
136 | } | |
137 | ||
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. */ | |
141 | devc->num_samples++; | |
142 | if (devc->limit_samples && devc->num_samples >= devc->limit_samples) { | |
143 | sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi, | |
144 | devc->cb_data); | |
145 | } | |
146 | ||
147 | } | |
148 | ||
149 | SR_PRIV void uni_t_ut32x_receive_transfer(struct libusb_transfer *transfer) | |
150 | { | |
151 | struct dev_context *devc; | |
152 | struct sr_dev_inst *sdi; | |
153 | int hid_payload_len, ret; | |
154 | ||
155 | sdi = transfer->user_data; | |
156 | devc = sdi->priv; | |
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, | |
162 | hid_payload_len); | |
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) | |
169 | process_packet(sdi); | |
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; | |
177 | } | |
178 | } | |
179 | ||
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); | |
186 | } | |
187 | } else | |
188 | libusb_free_transfer(devc->xfer); | |
189 | ||
190 | } | |
191 | ||
192 | SR_PRIV int uni_t_ut32x_handle_events(int fd, int revents, void *cb_data) | |
193 | { | |
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; | |
200 | struct timeval tv; | |
201 | int len, ret; | |
202 | unsigned char cmd[2]; | |
203 | ||
204 | (void)fd; | |
205 | (void)revents; | |
206 | ||
207 | if (!(sdi = cb_data)) | |
208 | return TRUE; | |
209 | ||
210 | di = sdi->driver; | |
211 | drvc = di->priv; | |
212 | ||
213 | if (!(devc = sdi->priv)) | |
214 | return TRUE; | |
215 | ||
216 | memset(&tv, 0, sizeof(struct timeval)); | |
217 | libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv, | |
218 | NULL); | |
219 | ||
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); | |
224 | ||
225 | /* Tell the device to stop sending USB packets. */ | |
226 | usb = sdi->conn; | |
227 | cmd[0] = 0x01; | |
228 | cmd[1] = CMD_STOP; | |
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)); | |
233 | } | |
234 | ||
235 | sdi->status = SR_ST_ACTIVE; | |
236 | return TRUE; | |
237 | } | |
238 | ||
239 | return TRUE; | |
240 | } |