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0acdd793 BV |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 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 | ||
6dcb9723 | 20 | #include <string.h> |
0acdd793 BV |
21 | #include "protocol.h" |
22 | ||
6dcb9723 BV |
23 | SR_PRIV int testo_set_serial_params(struct sr_usb_dev_inst *usb) |
24 | { | |
25 | int ret; | |
26 | ||
27 | if ((ret = libusb_control_transfer(usb->devhdl, 0x40, FTDI_SET_BAUDRATE, | |
28 | FTDI_BAUDRATE_115200, FTDI_INDEX, NULL, 0, 10)) < 0) { | |
29 | sr_err("Failed to set baudrate: %s", libusb_error_name(ret)); | |
30 | return SR_ERR; | |
31 | } | |
32 | ||
33 | if ((ret = libusb_control_transfer(usb->devhdl, 0x40, FTDI_SET_PARAMS, | |
34 | FTDI_PARAMS_8N1, FTDI_INDEX, NULL, 0, 10)) < 0) { | |
35 | sr_err("Failed to set comm parameters: %s", libusb_error_name(ret)); | |
36 | return SR_ERR; | |
37 | } | |
38 | ||
39 | if ((ret = libusb_control_transfer(usb->devhdl, 0x40, FTDI_SET_FLOWCTRL, | |
40 | FTDI_FLOW_NONE, FTDI_INDEX, NULL, 0, 10)) < 0) { | |
41 | sr_err("Failed to set flow control: %s", libusb_error_name(ret)); | |
42 | return SR_ERR; | |
43 | } | |
44 | ||
45 | if ((ret = libusb_control_transfer(usb->devhdl, 0x40, FTDI_SET_MODEMCTRL, | |
46 | FTDI_MODEM_ALLHIGH, FTDI_INDEX, NULL, 0, 10)) < 0) { | |
47 | sr_err("Failed to set modem control: %s", libusb_error_name(ret)); | |
48 | return SR_ERR; | |
49 | } | |
50 | ||
51 | return SR_OK; | |
52 | } | |
53 | ||
54 | /* Due to the modular nature of the Testo hardware, you can't assume | |
55 | * which measurements the device will supply. Fetch a single result | |
56 | * set synchronously to see which measurements it has. */ | |
57 | SR_PRIV int testo_probe_channels(struct sr_dev_inst *sdi) | |
0acdd793 | 58 | { |
0acdd793 | 59 | struct dev_context *devc; |
6dcb9723 BV |
60 | struct sr_usb_dev_inst *usb; |
61 | struct sr_channel *ch; | |
62 | int unit, packet_len, len, i; | |
63 | unsigned char packet[MAX_REPLY_SIZE], buf[MAX_REPLY_SIZE]; | |
64 | char *probe_name; | |
0acdd793 | 65 | |
6dcb9723 BV |
66 | devc = sdi->priv; |
67 | usb = sdi->conn; | |
0acdd793 | 68 | |
6dcb9723 BV |
69 | if (sdi->driver->dev_open(sdi) != SR_OK) |
70 | return SR_ERR; | |
71 | if (testo_set_serial_params(usb) != SR_OK) | |
72 | return SR_ERR; | |
73 | if (libusb_bulk_transfer(usb->devhdl, EP_OUT, devc->model->request, | |
74 | devc->model->request_size, &devc->reply_size, 10) < 0) | |
75 | return SR_ERR; | |
76 | packet_len = 0; | |
77 | while(TRUE) { | |
78 | if (libusb_bulk_transfer(usb->devhdl, EP_IN, buf, MAX_REPLY_SIZE, | |
79 | &len, 250) < 0) | |
80 | return SR_ERR; | |
81 | if (len == 2) | |
82 | /* FTDI cruft */ | |
83 | continue; | |
84 | sr_dbg("got %d", len); | |
85 | if (packet_len + len - 2 > MAX_REPLY_SIZE) | |
86 | return SR_ERR; | |
87 | memcpy(packet + packet_len, buf + 2, len - 2); | |
88 | packet_len += len - 2; | |
0acdd793 | 89 | |
6dcb9723 BV |
90 | if (packet_len >= 7) { |
91 | if (!testo_check_packet(packet, packet_len)) | |
92 | return SR_ERR; | |
93 | if (packet_len >= 7 + packet[6] * 7 + 2) | |
94 | /* Got a complete packet. */ | |
95 | break; | |
96 | } | |
97 | } | |
0acdd793 | 98 | |
6dcb9723 BV |
99 | if (packet[6] > MAX_CHANNELS) { |
100 | sr_err("Device says it has %d channels!", packet[6]); | |
101 | return SR_ERR; | |
0acdd793 BV |
102 | } |
103 | ||
6dcb9723 BV |
104 | for (i = 0; i < packet[6]; i++) { |
105 | unit = packet[7 + i * 7 + 4]; | |
106 | devc->channel_units[i] = unit; | |
107 | switch (unit) { | |
108 | case 1: | |
109 | probe_name = "Temperature"; | |
110 | break; | |
111 | case 3: | |
112 | probe_name = "Humidity"; | |
113 | break; | |
114 | case 5: | |
115 | probe_name = "Windspeed"; | |
116 | break; | |
117 | case 24: | |
118 | probe_name = "Pressure"; | |
119 | break; | |
120 | default: | |
121 | sr_dbg("Unsupported measurement unit %d", unit); | |
122 | return SR_ERR; | |
123 | } | |
124 | ch = sr_channel_new(i, SR_CHANNEL_ANALOG, TRUE, probe_name); | |
125 | sdi->channels = g_slist_append(sdi->channels, ch); | |
126 | } | |
127 | devc->num_channels = packet[6]; | |
128 | ||
129 | sdi->driver->dev_close(sdi); | |
130 | ||
131 | return SR_OK; | |
132 | } | |
133 | ||
134 | SR_PRIV int testo_request_packet(const struct sr_dev_inst *sdi) | |
135 | { | |
136 | struct dev_context *devc; | |
137 | struct sr_usb_dev_inst *usb; | |
138 | int ret; | |
139 | ||
140 | devc = sdi->priv; | |
141 | usb = sdi->conn; | |
142 | ||
143 | libusb_fill_bulk_transfer(devc->out_transfer, usb->devhdl, EP_OUT, | |
144 | devc->model->request, devc->model->request_size, | |
145 | receive_transfer, (void *)sdi, 100); | |
146 | if ((ret = libusb_submit_transfer(devc->out_transfer) != 0)) { | |
147 | sr_err("Failed to request packet: %s.", libusb_error_name(ret)); | |
148 | sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi, | |
149 | devc->cb_data); | |
150 | return SR_ERR; | |
151 | } | |
152 | sr_dbg("Requested new packet."); | |
153 | ||
154 | return SR_OK; | |
155 | } | |
156 | ||
157 | /* Check if the packet is well-formed. This matches packets for the | |
158 | * Testo 175/177/400/650/950/435/635/735/445/645/945/946/545. */ | |
159 | SR_PRIV gboolean testo_check_packet(unsigned char *buf, int len) | |
160 | { | |
161 | int i; | |
162 | unsigned char check[] = { 0x21, 0, 0, 0, 1 }; | |
163 | ||
164 | if (len < 5) | |
165 | return FALSE; | |
166 | ||
167 | for (i = 0; i < 5; i++) { | |
168 | if (buf[i] != check[i]) { | |
169 | sr_dbg("Packet has invalid prefix."); | |
170 | return FALSE; | |
171 | } | |
172 | } | |
173 | ||
174 | /* TODO: check FCS, algorithm corresponds to python crcmod crc-16-mcrf4xx */ | |
175 | ||
0acdd793 BV |
176 | return TRUE; |
177 | } | |
6dcb9723 BV |
178 | |
179 | static float binary32_le_to_float(unsigned char *buf) | |
180 | { | |
181 | GFloatIEEE754 f; | |
182 | ||
183 | f.v_float = 0; | |
184 | f.mpn.sign = (buf[3] & 0x80) ? 1 : 0; | |
185 | f.mpn.biased_exponent = (buf[3] << 1) | (buf[2] >> 7); | |
186 | f.mpn.mantissa = buf[0] | (buf[1] << 8) | ((buf[2] & 0x7f) << 16); | |
187 | ||
188 | return f.v_float; | |
189 | } | |
190 | ||
191 | SR_PRIV void testo_receive_packet(const struct sr_dev_inst *sdi) | |
192 | { | |
193 | struct dev_context *devc; | |
194 | struct sr_datafeed_packet packet; | |
195 | struct sr_datafeed_analog analog; | |
196 | struct sr_channel *ch; | |
197 | GString *dbg; | |
198 | float value; | |
199 | int i; | |
200 | unsigned char *buf; | |
201 | ||
202 | devc = sdi->priv; | |
203 | sr_dbg("Got %d-byte packet.", devc->reply_size); | |
204 | ||
205 | if (sr_log_loglevel_get() >= SR_LOG_SPEW) { | |
206 | dbg = g_string_sized_new(128); | |
207 | g_string_printf(dbg, "Packet:"); | |
208 | for (i = 0; i < devc->reply_size; i++) | |
209 | g_string_append_printf(dbg, " %.2x", devc->reply[i]); | |
210 | sr_spew("%s", dbg->str); | |
211 | g_string_free(dbg, TRUE); | |
212 | } | |
213 | ||
214 | if (!testo_check_packet(devc->reply, devc->reply_size)) | |
215 | return; | |
216 | ||
217 | packet.type = SR_DF_ANALOG; | |
218 | packet.payload = &analog; | |
219 | analog.num_samples = 1; | |
220 | analog.mqflags = 0; | |
221 | analog.data = &value; | |
222 | /* Decode 7-byte values */ | |
223 | for (i = 0; i < devc->reply[6]; i++) { | |
224 | buf = devc->reply + 7 + i * 7; | |
225 | value = binary32_le_to_float(buf); | |
226 | sr_dbg("value: %f unit %d exp %d", value, buf[4], buf[6]); | |
227 | switch (buf[4]) { | |
228 | case 1: | |
229 | analog.mq = SR_MQ_TEMPERATURE; | |
230 | analog.unit = SR_UNIT_CELSIUS; | |
231 | break; | |
232 | case 3: | |
233 | analog.mq = SR_MQ_RELATIVE_HUMIDITY; | |
234 | analog.unit = SR_UNIT_HUMIDITY_293K; | |
235 | break; | |
236 | case 5: | |
237 | analog.mq = SR_MQ_WIND_SPEED; | |
238 | analog.unit = SR_UNIT_METER_SECOND; | |
239 | break; | |
240 | case 24: | |
241 | analog.mq = SR_MQ_PRESSURE; | |
242 | analog.unit = SR_UNIT_HECTOPASCAL; | |
243 | break; | |
244 | default: | |
245 | sr_dbg("Unsupported measurement unit %d", buf[4]); | |
246 | return; | |
247 | } | |
248 | ||
249 | /* Match this measurement with its channel. */ | |
250 | for (i = 0; i < devc->num_channels; i++) { | |
251 | if (devc->channel_units[i] == buf[4]) | |
252 | break; | |
253 | } | |
254 | if (i == devc->num_channels) { | |
255 | /* Shouldn't happen. */ | |
256 | sr_err("Some channel hotswapped in!"); | |
257 | return; | |
258 | } | |
259 | ch = g_slist_nth_data(sdi->channels, i); | |
260 | sr_dbg("channel %d name %s unit %d", i, ch->name, analog.unit); | |
261 | analog.channels = g_slist_append(NULL, ch); | |
262 | sr_session_send(sdi, &packet); | |
263 | g_slist_free(analog.channels); | |
264 | } | |
265 | } | |
266 |