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1 | /* | |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 <glib.h> | |
21 | #include <stdlib.h> | |
22 | #include <math.h> | |
23 | #include <string.h> | |
24 | #include <errno.h> | |
25 | #include "libsigrok.h" | |
26 | #include "libsigrok-internal.h" | |
27 | #include "protocol.h" | |
28 | ||
29 | /* User-defined FS9721_LP3 flag 'c2c1_10' means temperature on this DMM. */ | |
30 | #define is_temperature info.is_c2c1_10 | |
31 | ||
32 | static void log_dmm_packet(const uint8_t *buf) | |
33 | { | |
34 | sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x" | |
35 | " %02x %02x %02x %02x %02x %02x %02x", | |
36 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], | |
37 | buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]); | |
38 | } | |
39 | ||
40 | /* Now see what the value means, and pass that on. */ | |
41 | static void fs9721_serial_handle_packet(const uint8_t *buf, | |
42 | struct dev_context *devc) | |
43 | { | |
44 | float floatval; | |
45 | struct sr_datafeed_packet packet; | |
46 | struct sr_datafeed_analog *analog; | |
47 | struct fs9721_info info; | |
48 | ||
49 | log_dmm_packet(buf); | |
50 | ||
51 | if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog)))) { | |
52 | sr_err("Analog packet malloc failed."); | |
53 | return; | |
54 | } | |
55 | ||
56 | if (!(analog->data = g_try_malloc(sizeof(float)))) { | |
57 | sr_err("Analog value malloc failed."); | |
58 | g_free(analog); | |
59 | return; | |
60 | } | |
61 | ||
62 | analog->num_samples = 1; | |
63 | analog->mq = -1; | |
64 | ||
65 | sr_fs9721_parse(buf, &floatval, analog, &info); | |
66 | *analog->data = floatval; | |
67 | ||
68 | if (is_temperature) { | |
69 | analog->mq = SR_MQ_TEMPERATURE; | |
70 | /* No Kelvin or Fahrenheit from the device, just Celsius. */ | |
71 | analog->unit = SR_UNIT_CELSIUS; | |
72 | } | |
73 | ||
74 | if (analog->mq != -1) { | |
75 | /* Got a measurement. */ | |
76 | packet.type = SR_DF_ANALOG; | |
77 | packet.payload = analog; | |
78 | sr_session_send(devc->cb_data, &packet); | |
79 | devc->num_samples++; | |
80 | } | |
81 | ||
82 | g_free(analog->data); | |
83 | g_free(analog); | |
84 | } | |
85 | ||
86 | static void handle_new_data(struct dev_context *devc) | |
87 | { | |
88 | int len, i, offset = 0; | |
89 | ||
90 | /* Try to get as much data as the buffer can hold. */ | |
91 | len = DMM_BUFSIZE - devc->buflen; | |
92 | len = serial_read(devc->serial, devc->buf + devc->buflen, len); | |
93 | if (len < 1) { | |
94 | sr_err("Serial port read error: %d.", len); | |
95 | return; | |
96 | } | |
97 | devc->buflen += len; | |
98 | ||
99 | /* Now look for packets in that data. */ | |
100 | while ((devc->buflen - offset) >= FS9721_PACKET_SIZE) { | |
101 | if (sr_fs9721_packet_valid(devc->buf + offset)) { | |
102 | fs9721_serial_handle_packet(devc->buf + offset, devc); | |
103 | offset += FS9721_PACKET_SIZE; | |
104 | } else { | |
105 | offset++; | |
106 | } | |
107 | } | |
108 | ||
109 | /* If we have any data left, move it to the beginning of our buffer. */ | |
110 | for (i = 0; i < devc->buflen - offset; i++) | |
111 | devc->buf[i] = devc->buf[offset + i]; | |
112 | devc->buflen -= offset; | |
113 | } | |
114 | ||
115 | SR_PRIV int tekpower_dmm_receive_data(int fd, int revents, void *cb_data) | |
116 | { | |
117 | struct sr_dev_inst *sdi; | |
118 | struct dev_context *devc; | |
119 | ||
120 | (void)fd; | |
121 | ||
122 | if (!(sdi = cb_data)) | |
123 | return TRUE; | |
124 | ||
125 | if (!(devc = sdi->priv)) | |
126 | return TRUE; | |
127 | ||
128 | if (revents == G_IO_IN) { | |
129 | /* Serial data arrived. */ | |
130 | handle_new_data(devc); | |
131 | } | |
132 | ||
133 | if (devc->num_samples >= devc->limit_samples) { | |
134 | sr_info("Requested number of samples reached, stopping."); | |
135 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
136 | return TRUE; | |
137 | } | |
138 | ||
139 | return TRUE; | |
140 | } |