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23669c3d DB |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2019 Dave Buechi <db@pflutsch.ch> | |
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 <config.h> | |
c810ad60 | 21 | #include <string.h> |
23669c3d DB |
22 | #include <math.h> |
23 | #include "protocol.h" | |
24 | ||
25 | static const uint8_t channel_assignment[16][2] = { | |
26 | /* MAIN AUX */ | |
27 | {0, 1}, /* T1 T2 */ | |
28 | {1, 0}, /* T2 T1 */ | |
29 | {2, 0}, /* T1-T2 T1 */ | |
30 | {2, 1}, /* T1-T2 T2 */ | |
31 | {0, 0}, /* T1 T1 MAX */ | |
32 | {1, 1}, /* T2 T2 MAX */ | |
33 | {2, 2}, /* T1-T2 T1-T2 MAX */ | |
34 | {2, 2}, /* T1-T2 T1-T2 MAX */ | |
35 | {0, 0}, /* T1 T1 MIN */ | |
36 | {1, 1}, /* T2 T2 MIN */ | |
37 | {2, 2}, /* T1-T2 T1-T2 MIN */ | |
38 | {2, 2}, /* T1-T2 T1-T2 MIN */ | |
39 | {0, 0}, /* T1 T1 AVG */ | |
40 | {1, 1}, /* T2 T2 AVG */ | |
41 | {2, 2}, /* T1-T2 T1-T2 AVG */ | |
42 | {2, 2}, /* T1-T2 T1-T2 AVG */ | |
43 | }; | |
44 | ||
45 | SR_PRIV gboolean mastech_ms6514_packet_valid(const uint8_t *buf) | |
46 | { | |
47 | if ((buf[0] == 0x65) && (buf[1] == 0x14) && | |
48 | (buf[16] == 0x0D) && (buf[17] == 0x0A)) | |
49 | return TRUE; | |
50 | ||
51 | return FALSE; | |
52 | } | |
53 | ||
54 | static uint64_t mastech_ms6514_flags(const uint8_t *buf, const uint8_t channel_index) | |
55 | { | |
56 | uint64_t flags; | |
57 | ||
58 | flags = 0; | |
59 | if ((buf[10] & 0x40) == 0x40) | |
60 | flags |= SR_MQFLAG_HOLD; | |
61 | ||
62 | if (channel_index == 0) { | |
63 | if ((buf[11] & 0x03) > 0x01) | |
64 | flags |= SR_MQFLAG_RELATIVE; | |
65 | } | |
66 | ||
67 | if (channel_index == 1) { | |
68 | switch (buf[12] & 0x03) { | |
69 | case 0x01: | |
70 | flags |= SR_MQFLAG_MAX; | |
71 | break; | |
72 | case 0x02: | |
73 | flags |= SR_MQFLAG_MIN; | |
74 | break; | |
75 | case 0x03: | |
76 | flags |= SR_MQFLAG_AVG; | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
81 | return flags; | |
82 | } | |
83 | ||
84 | static enum sr_unit mastech_ms6514_unit(const uint8_t *buf) | |
85 | { | |
86 | enum sr_unit unit; | |
87 | ||
88 | switch (buf[10] & 0x03) { | |
89 | case 0x01: | |
90 | unit = SR_UNIT_CELSIUS; | |
91 | break; | |
92 | case 0x02: | |
93 | unit = SR_UNIT_FAHRENHEIT; | |
94 | break; | |
95 | case 0x03: | |
96 | unit = SR_UNIT_KELVIN; | |
97 | break; | |
98 | default: | |
99 | unit = SR_UNIT_UNITLESS; | |
100 | break; | |
101 | } | |
102 | ||
103 | return unit; | |
104 | } | |
105 | ||
106 | static uint8_t mastech_ms6514_channel_assignment(const uint8_t *buf, const uint8_t index) | |
107 | { | |
108 | return channel_assignment[((buf[12] & 0x03) << 2) + (buf[11] & 0x03)][index]; | |
109 | } | |
110 | ||
111 | static uint8_t mastech_ms6514_data_source(const uint8_t *buf) | |
112 | { | |
113 | if ((buf[2] & 0x01) == 0x01) | |
114 | return DATA_SOURCE_MEMORY; | |
115 | else | |
116 | return DATA_SOURCE_LIVE; | |
117 | } | |
118 | ||
119 | static float mastech_ms6514_temperature(const uint8_t *buf, const uint8_t channel_index, int *digits) | |
120 | { | |
121 | float value; | |
122 | uint8_t modifiers; | |
123 | ||
124 | *digits = 0; | |
125 | value = (buf[5 + channel_index * 2] << 8) + buf[6 + channel_index * 2]; | |
126 | modifiers = buf[11 + channel_index]; | |
127 | ||
128 | if ((modifiers & 0x80) == 0x80) | |
129 | value = -value; | |
130 | ||
131 | if ((modifiers & 0x08) == 0x08) { | |
132 | value /= 10.0; | |
133 | *digits = 1; | |
134 | } | |
135 | ||
136 | if ((modifiers & 0x40) == 0x40) | |
137 | value = INFINITY; | |
138 | ||
139 | return value; | |
140 | } | |
141 | ||
142 | static void mastech_ms6514_data(struct sr_dev_inst *sdi, const uint8_t *buf) | |
143 | { | |
144 | struct dev_context *devc; | |
145 | struct sr_datafeed_packet packet; | |
146 | struct sr_datafeed_analog analog; | |
147 | struct sr_analog_encoding encoding; | |
148 | struct sr_analog_meaning meaning; | |
149 | struct sr_analog_spec spec; | |
150 | struct sr_channel *ch; | |
151 | float value; | |
152 | int i, digits; | |
153 | ||
154 | devc = sdi->priv; | |
155 | ||
156 | if ((devc->data_source == DATA_SOURCE_MEMORY) && \ | |
157 | (mastech_ms6514_data_source(buf) == DATA_SOURCE_LIVE)) { | |
158 | sr_dev_acquisition_stop(sdi); | |
159 | return; | |
160 | } | |
161 | ||
162 | for (i = 0; i < MASTECH_MS6514_NUM_CHANNELS; i++) { | |
163 | ch = g_slist_nth_data(sdi->channels, i); | |
164 | if (!ch->enabled) | |
165 | continue; | |
166 | ||
167 | value = mastech_ms6514_temperature(buf, i, &digits); | |
168 | sr_analog_init(&analog, &encoding, &meaning, &spec, digits); | |
169 | analog.num_samples = 1; | |
170 | analog.data = &value; | |
171 | analog.meaning->mq = SR_MQ_TEMPERATURE; | |
172 | analog.meaning->unit = mastech_ms6514_unit(buf); | |
173 | analog.meaning->mqflags = mastech_ms6514_flags(buf, i); | |
174 | ||
175 | analog.meaning->channels = g_slist_append(NULL, | |
176 | g_slist_nth_data(sdi->channels, | |
177 | mastech_ms6514_channel_assignment(buf, i))); | |
178 | ||
179 | packet.type = SR_DF_ANALOG; | |
180 | packet.payload = &analog; | |
181 | sr_session_send(sdi, &packet); | |
182 | g_slist_free(analog.meaning->channels); | |
183 | } | |
184 | ||
185 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
186 | } | |
187 | ||
188 | static const uint8_t *mastech_ms6514_parse_data(struct sr_dev_inst *sdi, | |
189 | const uint8_t *buf, int len) | |
190 | { | |
191 | if (len < MASTECH_MS6514_FRAME_SIZE) | |
192 | return NULL; /* Not enough data for a full packet. */ | |
193 | ||
194 | if (buf[0] != 0x65 || buf[1] != 0x14) | |
195 | return buf + 1; /* Try to re-synchronize on a packet start. */ | |
196 | ||
197 | if (buf[16] != 0x0D || buf[17] != 0x0A) | |
198 | return buf + MASTECH_MS6514_FRAME_SIZE; /* Valid start but no valid end -> skip. */ | |
199 | ||
200 | mastech_ms6514_data(sdi, buf); | |
201 | ||
202 | return buf + MASTECH_MS6514_FRAME_SIZE; | |
203 | } | |
204 | ||
205 | SR_PRIV int mastech_ms6514_receive_data(int fd, int revents, void *cb_data) | |
206 | { | |
207 | struct sr_dev_inst *sdi; | |
208 | struct dev_context *devc; | |
209 | struct sr_serial_dev_inst *serial; | |
210 | const uint8_t *ptr, *next_ptr, *end_ptr; | |
211 | int len; | |
212 | ||
213 | (void)fd; | |
214 | ||
215 | if (!(sdi = cb_data) || !(devc = sdi->priv) || revents != G_IO_IN) | |
216 | return TRUE; | |
217 | serial = sdi->conn; | |
218 | ||
219 | /* Try to get as much data as the buffer can hold. */ | |
220 | len = sizeof(devc->buf) - devc->buf_len; | |
221 | len = serial_read_nonblocking(serial, devc->buf + devc->buf_len, len); | |
222 | if (len < 1) { | |
223 | sr_err("Serial port read error: %d.", len); | |
224 | return FALSE; | |
225 | } | |
226 | devc->buf_len += len; | |
227 | ||
228 | /* Now look for packets in that data. */ | |
229 | ptr = devc->buf; | |
230 | end_ptr = ptr + devc->buf_len; | |
231 | while ((next_ptr = mastech_ms6514_parse_data(sdi, ptr, end_ptr - ptr))) | |
232 | ptr = next_ptr; | |
233 | ||
234 | /* If we have any data left, move it to the beginning of our buffer. */ | |
235 | memmove(devc->buf, ptr, end_ptr - ptr); | |
236 | devc->buf_len -= ptr - devc->buf; | |
237 | ||
238 | /* If buffer is full and no valid packet was found, wipe buffer. */ | |
239 | if (devc->buf_len >= sizeof(devc->buf)) { | |
240 | devc->buf_len = 0; | |
241 | return FALSE; | |
242 | } | |
243 | ||
244 | if (sr_sw_limits_check(&devc->limits)) { | |
245 | sr_dev_acquisition_stop(sdi); | |
246 | return TRUE; | |
247 | } | |
248 | ||
249 | return TRUE; | |
250 | } |