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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de> | |
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 2 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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "protocol.h" | |
22 | ||
23 | #define NUM_CHANNELS 4 | |
24 | ||
25 | struct center_info { | |
26 | float temp[NUM_CHANNELS]; | |
27 | gboolean rec, std, max, min, maxmin, t1t2, rel, hold, lowbat, celsius; | |
28 | gboolean memfull, autooff; | |
29 | gboolean mode_std, mode_rel, mode_max, mode_min, mode_maxmin; | |
30 | }; | |
31 | ||
32 | static int center_send(struct sr_serial_dev_inst *serial, const char *cmd) | |
33 | { | |
34 | int ret; | |
35 | ||
36 | if ((ret = serial_write_blocking(serial, cmd, strlen(cmd), 0)) < 0) { | |
37 | sr_err("Error sending '%s' command: %d.", cmd, ret); | |
38 | return SR_ERR; | |
39 | } | |
40 | ||
41 | return SR_OK; | |
42 | } | |
43 | ||
44 | SR_PRIV gboolean center_3xx_packet_valid(const uint8_t *buf) | |
45 | { | |
46 | return (buf[0] == 0x02 && buf[44] == 0x03); | |
47 | } | |
48 | ||
49 | static void log_packet(const uint8_t *buf, int idx) | |
50 | { | |
51 | int i; | |
52 | GString *s; | |
53 | ||
54 | s = g_string_sized_new(100); | |
55 | g_string_printf(s, "Packet: "); | |
56 | for (i = 0; i < center_devs[idx].packet_size; i++) | |
57 | g_string_append_printf(s, "%02x ", buf[i]); | |
58 | sr_spew("%s", s->str); | |
59 | g_string_free(s, TRUE); | |
60 | } | |
61 | ||
62 | static int packet_parse(const uint8_t *buf, int idx, struct center_info *info) | |
63 | { | |
64 | int i; | |
65 | uint16_t temp_u16; | |
66 | ||
67 | log_packet(buf, idx); | |
68 | ||
69 | /* Byte 0: Always 0x02. */ | |
70 | ||
71 | /* Byte 1: Various status bits. */ | |
72 | info->rec = (buf[1] & (1 << 0)) != 0; | |
73 | info->mode_std = (((buf[1] >> 1) & 0x3) == 0); | |
74 | info->mode_max = (((buf[1] >> 1) & 0x3) == 1); | |
75 | info->mode_min = (((buf[1] >> 1) & 0x3) == 2); | |
76 | info->mode_maxmin = (((buf[1] >> 1) & 0x3) == 3); | |
77 | /* TODO: Rel. Not available on all models. */ | |
78 | info->t1t2 = (buf[1] & (1 << 3)) != 0; | |
79 | info->rel = (buf[1] & (1 << 4)) != 0; | |
80 | info->hold = (buf[1] & (1 << 5)) != 0; | |
81 | info->lowbat = (buf[1] & (1 << 6)) != 0; | |
82 | info->celsius = (buf[1] & (1 << 7)) != 0; | |
83 | ||
84 | /* Byte 2: Further status bits. */ | |
85 | info->memfull = (buf[2] & (1 << 0)) != 0; | |
86 | info->autooff = (buf[2] & (1 << 7)) != 0; | |
87 | ||
88 | /* Byte 7+8/9+10/11+12/13+14: channel T1/T2/T3/T4 temperature. */ | |
89 | for (i = 0; i < NUM_CHANNELS; i++) { | |
90 | temp_u16 = buf[8 + (i * 2)]; | |
91 | temp_u16 |= ((uint16_t)buf[7 + (i * 2)] << 8); | |
92 | info->temp[i] = (float)temp_u16; | |
93 | } | |
94 | ||
95 | /* Byte 43: Specifies whether we need to divide the value(s) by 10. */ | |
96 | for (i = 0; i < NUM_CHANNELS; i++) { | |
97 | /* Bit = 0: Divide by 10. Bit = 1: Don't divide by 10. */ | |
98 | if ((buf[43] & (1 << i)) == 0) | |
99 | info->temp[i] /= 10; | |
100 | } | |
101 | ||
102 | /* Bytes 39-42: Overflow/overlimit bits, depending on mode. */ | |
103 | for (i = 0; i < NUM_CHANNELS; i++) { | |
104 | if (info->mode_std && ((buf[39] & (1 << i)) != 0)) | |
105 | info->temp[i] = INFINITY; | |
106 | /* TODO: Rel. Not available on all models. */ | |
107 | // if (info->mode_rel && ((buf[40] & (1 << i)) != 0)) | |
108 | // info->temp[i] = INFINITY; | |
109 | if (info->mode_max && ((buf[41] & (1 << i)) != 0)) | |
110 | info->temp[i] = INFINITY; | |
111 | if (info->mode_min && ((buf[42] & (1 << i)) != 0)) | |
112 | info->temp[i] = INFINITY; | |
113 | /* TODO: Minmax? */ | |
114 | } | |
115 | ||
116 | /* Byte 44: Always 0x03. */ | |
117 | ||
118 | return SR_OK; | |
119 | } | |
120 | ||
121 | static int handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, int idx) | |
122 | { | |
123 | struct sr_datafeed_packet packet; | |
124 | struct sr_datafeed_analog analog; | |
125 | struct dev_context *devc; | |
126 | struct center_info info; | |
127 | GSList *l; | |
128 | int i, ret; | |
129 | ||
130 | devc = sdi->priv; | |
131 | ||
132 | memset(&analog, 0, sizeof(struct sr_datafeed_analog)); | |
133 | memset(&info, 0, sizeof(struct center_info)); | |
134 | ||
135 | ret = packet_parse(buf, idx, &info); | |
136 | if (ret < 0) { | |
137 | sr_err("Failed to parse packet."); | |
138 | return SR_ERR; | |
139 | } | |
140 | ||
141 | /* Common values for all 4 channels. */ | |
142 | packet.type = SR_DF_ANALOG; | |
143 | packet.payload = &analog; | |
144 | analog.mq = SR_MQ_TEMPERATURE; | |
145 | analog.unit = (info.celsius) ? SR_UNIT_CELSIUS : SR_UNIT_FAHRENHEIT; | |
146 | analog.num_samples = 1; | |
147 | ||
148 | /* Send the values for T1 - T4. */ | |
149 | for (i = 0; i < NUM_CHANNELS; i++) { | |
150 | l = NULL; | |
151 | l = g_slist_append(l, g_slist_nth_data(sdi->channels, i)); | |
152 | analog.channels = l; | |
153 | analog.data = &(info.temp[i]); | |
154 | sr_session_send(devc->cb_data, &packet); | |
155 | g_slist_free(l); | |
156 | } | |
157 | ||
158 | devc->num_samples++; | |
159 | ||
160 | return SR_OK; | |
161 | } | |
162 | ||
163 | /* Return TRUE if a full packet was parsed, FALSE otherwise. */ | |
164 | static gboolean handle_new_data(struct sr_dev_inst *sdi, int idx) | |
165 | { | |
166 | struct dev_context *devc; | |
167 | struct sr_serial_dev_inst *serial; | |
168 | int len, i, offset = 0, ret = FALSE; | |
169 | ||
170 | devc = sdi->priv; | |
171 | serial = sdi->conn; | |
172 | ||
173 | /* Try to get as much data as the buffer can hold. */ | |
174 | len = SERIAL_BUFSIZE - devc->buflen; | |
175 | len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len); | |
176 | if (len < 1) { | |
177 | sr_err("Serial port read error: %d.", len); | |
178 | return FALSE; | |
179 | } | |
180 | ||
181 | devc->buflen += len; | |
182 | ||
183 | /* Now look for packets in that data. */ | |
184 | while ((devc->buflen - offset) >= center_devs[idx].packet_size) { | |
185 | if (center_devs[idx].packet_valid(devc->buf + offset)) { | |
186 | handle_packet(devc->buf + offset, sdi, idx); | |
187 | offset += center_devs[idx].packet_size; | |
188 | ret = TRUE; | |
189 | } else { | |
190 | offset++; | |
191 | } | |
192 | } | |
193 | ||
194 | /* If we have any data left, move it to the beginning of our buffer. */ | |
195 | for (i = 0; i < devc->buflen - offset; i++) | |
196 | devc->buf[i] = devc->buf[offset + i]; | |
197 | devc->buflen -= offset; | |
198 | ||
199 | return ret; | |
200 | } | |
201 | ||
202 | static int receive_data(int fd, int revents, int idx, void *cb_data) | |
203 | { | |
204 | struct sr_dev_inst *sdi; | |
205 | struct dev_context *devc; | |
206 | int64_t t; | |
207 | static gboolean request_new_packet = TRUE; | |
208 | struct sr_serial_dev_inst *serial; | |
209 | ||
210 | (void)fd; | |
211 | ||
212 | if (!(sdi = cb_data)) | |
213 | return TRUE; | |
214 | ||
215 | if (!(devc = sdi->priv)) | |
216 | return TRUE; | |
217 | ||
218 | serial = sdi->conn; | |
219 | ||
220 | if (revents == G_IO_IN) { | |
221 | /* New data arrived. */ | |
222 | request_new_packet = handle_new_data(sdi, idx); | |
223 | } else { | |
224 | /* | |
225 | * Timeout. Send "A" to request a packet, but then don't send | |
226 | * further "A" commands until we received a full packet first. | |
227 | */ | |
228 | if (request_new_packet) { | |
229 | center_send(serial, "A"); | |
230 | request_new_packet = FALSE; | |
231 | } | |
232 | } | |
233 | ||
234 | if (devc->limit_samples && devc->num_samples >= devc->limit_samples) { | |
235 | sr_info("Requested number of samples reached."); | |
236 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
237 | return TRUE; | |
238 | } | |
239 | ||
240 | if (devc->limit_msec) { | |
241 | t = (g_get_monotonic_time() - devc->starttime) / 1000; | |
242 | if (t > (int64_t)devc->limit_msec) { | |
243 | sr_info("Requested time limit reached."); | |
244 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
245 | return TRUE; | |
246 | } | |
247 | } | |
248 | ||
249 | return TRUE; | |
250 | } | |
251 | ||
252 | #define RECEIVE_DATA(ID_UPPER) \ | |
253 | SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \ | |
254 | return receive_data(fd, revents, ID_UPPER, cb_data); } | |
255 | ||
256 | /* Driver-specific receive_data() wrappers */ | |
257 | RECEIVE_DATA(CENTER_309) | |
258 | RECEIVE_DATA(VOLTCRAFT_K204) |