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7ec5b549 UH |
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 | ||
0cd8e231 UH |
23 | #define PACKET_SIZE 10 |
24 | ||
25 | static int mic_send(struct sr_serial_dev_inst *serial, const char *cmd) | |
7ec5b549 | 26 | { |
0cd8e231 UH |
27 | int ret; |
28 | ||
29 | if ((ret = serial_write(serial, cmd, strlen(cmd))) < 0) { | |
30 | sr_err("Error sending '%s' command: %d.", cmd, ret); | |
31 | return SR_ERR; | |
32 | } | |
33 | ||
34 | return SR_OK; | |
35 | } | |
36 | ||
37 | SR_PRIV int mic_cmd_get_device_info(struct sr_serial_dev_inst *serial) | |
38 | { | |
39 | return mic_send(serial, "I\r"); | |
40 | } | |
41 | ||
42 | static int mic_cmd_set_realtime_mode(struct sr_serial_dev_inst *serial) | |
43 | { | |
44 | return mic_send(serial, "S 1 M 2 32 3\r"); | |
45 | } | |
46 | ||
47 | static gboolean packet_valid(const uint8_t *buf) | |
48 | { | |
49 | if (buf[0] != 'v' || buf[1] != ' ' || buf[5] != ' ' || buf[9] != '\r') | |
50 | return FALSE; | |
51 | ||
52 | if (!isdigit(buf[2]) || !isdigit(buf[3]) || !isdigit(buf[4])) | |
53 | return FALSE; | |
54 | ||
55 | if (!isdigit(buf[6]) || !isdigit(buf[7]) || !isdigit(buf[8])) | |
56 | return FALSE; | |
57 | ||
58 | return TRUE; | |
59 | } | |
60 | ||
61 | static int packet_parse(const char *buf, float *temp, float *humidity) | |
62 | { | |
63 | char tmp[4]; | |
64 | ||
65 | /* Packet format: "v ttt hhh\r". */ | |
66 | ||
67 | /* TODO: Sanity check on buf. For now we assume well-formed ASCII. */ | |
68 | ||
69 | tmp[3] = '\0'; | |
70 | ||
71 | strncpy((char *)&tmp, &buf[2], 3); | |
72 | *temp = g_ascii_strtoull((const char *)&tmp, NULL, 10) / 10; | |
73 | ||
74 | strncpy((char *)&tmp, &buf[6], 3); | |
75 | *humidity = g_ascii_strtoull((const char *)&tmp, NULL, 10) / 10; | |
76 | ||
77 | return SR_OK; | |
78 | } | |
79 | ||
80 | static int handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, int idx) | |
81 | { | |
82 | float temperature, humidity; | |
83 | struct sr_datafeed_packet packet; | |
84 | struct sr_datafeed_analog analog; | |
85 | struct dev_context *devc; | |
86 | GSList *l; | |
87 | int ret; | |
7ec5b549 | 88 | |
0cd8e231 UH |
89 | (void)idx; |
90 | ||
91 | devc = sdi->priv; | |
92 | ||
93 | ret = packet_parse((const char *)buf, &temperature, &humidity); | |
94 | if (ret < 0) { | |
95 | sr_err("Failed to parse packet."); | |
96 | return SR_ERR; | |
97 | } | |
98 | ||
99 | /* Common values for both probes. */ | |
100 | packet.type = SR_DF_ANALOG; | |
101 | packet.payload = &analog; | |
102 | analog.num_samples = 1; | |
103 | ||
104 | /* Temperature. */ | |
105 | l = g_slist_copy(sdi->probes); | |
106 | l = g_slist_remove_link(l, g_slist_nth(l, 1)); | |
107 | analog.probes = l; | |
108 | analog.mq = SR_MQ_TEMPERATURE; | |
109 | analog.unit = SR_UNIT_CELSIUS; /* TODO: Use C/F correctly. */ | |
110 | analog.data = &temperature; | |
111 | sr_session_send(devc->cb_data, &packet); | |
112 | g_slist_free(l); | |
113 | ||
114 | /* Humidity. */ | |
115 | l = g_slist_copy(sdi->probes); | |
116 | l = g_slist_remove_link(l, g_slist_nth(l, 0)); | |
117 | analog.probes = l; | |
118 | analog.mq = SR_MQ_RELATIVE_HUMIDITY; | |
119 | analog.unit = SR_UNIT_PERCENTAGE; | |
120 | analog.data = &humidity; | |
121 | sr_session_send(devc->cb_data, &packet); | |
122 | g_slist_free(l); | |
123 | ||
124 | devc->num_samples++; | |
125 | ||
126 | return SR_OK; | |
127 | } | |
128 | ||
129 | static void handle_new_data(struct sr_dev_inst *sdi, int idx) | |
130 | { | |
7ec5b549 | 131 | struct dev_context *devc; |
0cd8e231 UH |
132 | int len, i, offset = 0; |
133 | ||
134 | devc = sdi->priv; | |
135 | ||
136 | /* Try to get as much data as the buffer can hold. */ | |
137 | len = SERIAL_BUFSIZE - devc->buflen; | |
138 | len = serial_read(devc->serial, devc->buf + devc->buflen, len); | |
139 | if (len < 1) { | |
140 | sr_err("Serial port read error: %d.", len); | |
141 | return; | |
142 | } | |
143 | ||
144 | devc->buflen += len; | |
145 | ||
146 | /* Now look for packets in that data. */ | |
147 | while ((devc->buflen - offset) >= PACKET_SIZE) { | |
148 | if (packet_valid(devc->buf + offset)) { | |
149 | handle_packet(devc->buf + offset, sdi, idx); | |
150 | offset += PACKET_SIZE; | |
151 | } else { | |
152 | offset++; | |
153 | } | |
154 | } | |
155 | ||
156 | /* If we have any data left, move it to the beginning of our buffer. */ | |
157 | for (i = 0; i < devc->buflen - offset; i++) | |
158 | devc->buf[i] = devc->buf[offset + i]; | |
159 | devc->buflen -= offset; | |
160 | } | |
161 | ||
162 | static int receive_data(int fd, int revents, int idx, void *cb_data) | |
163 | { | |
164 | struct sr_dev_inst *sdi; | |
165 | struct dev_context *devc; | |
166 | int64_t t; | |
167 | static gboolean first_time = TRUE; | |
168 | ||
169 | (void)fd; | |
7ec5b549 UH |
170 | |
171 | if (!(sdi = cb_data)) | |
172 | return TRUE; | |
173 | ||
174 | if (!(devc = sdi->priv)) | |
175 | return TRUE; | |
176 | ||
177 | if (revents == G_IO_IN) { | |
0cd8e231 UH |
178 | /* New data arrived. */ |
179 | handle_new_data(sdi, idx); | |
180 | } else { | |
181 | /* Timeout. */ | |
182 | if (first_time) { | |
183 | mic_cmd_set_realtime_mode(devc->serial); | |
184 | first_time = FALSE; | |
185 | } | |
186 | } | |
187 | ||
188 | if (devc->limit_samples && devc->num_samples >= devc->limit_samples) { | |
189 | sr_info("Requested number of samples reached."); | |
190 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
191 | return TRUE; | |
192 | } | |
193 | ||
194 | if (devc->limit_msec) { | |
195 | t = (g_get_monotonic_time() - devc->starttime) / 1000; | |
196 | if (t > (int64_t)devc->limit_msec) { | |
197 | sr_info("Requested time limit reached."); | |
198 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
199 | return TRUE; | |
200 | } | |
7ec5b549 UH |
201 | } |
202 | ||
203 | return TRUE; | |
204 | } | |
0cd8e231 UH |
205 | |
206 | #define RECEIVE_DATA(ID_UPPER) \ | |
207 | SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \ | |
208 | return receive_data(fd, revents, ID_UPPER, cb_data); } | |
209 | ||
210 | /* Driver-specific receive_data() wrappers */ | |
211 | RECEIVE_DATA(MIC_98583) |