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7dc55d93 AG |
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> | |
7dc55d93 AG |
21 | #include <stdlib.h> |
22 | #include <math.h> | |
23 | #include <string.h> | |
24 | #include <errno.h> | |
bbabddbd UH |
25 | #include "libsigrok.h" |
26 | #include "libsigrok-internal.h" | |
27 | #include "protocol.h" | |
7dc55d93 | 28 | |
bbabddbd | 29 | /* Now see what the value means, and pass that on. */ |
be5c1d3b AG |
30 | static void fs9721_serial_handle_packet(const struct fs9721_data *data, |
31 | struct dev_context *devc) | |
7dc55d93 | 32 | { |
be5c1d3b | 33 | float rawval; |
7dc55d93 AG |
34 | struct sr_datafeed_packet packet; |
35 | struct sr_datafeed_analog *analog; | |
36 | ||
bbabddbd UH |
37 | if (!(analog = g_try_malloc0(sizeof(struct sr_datafeed_analog)))) { |
38 | sr_err("Failed to malloc packet."); | |
7dc55d93 AG |
39 | return; |
40 | } | |
bbabddbd UH |
41 | |
42 | if (!(analog->data = g_try_malloc(sizeof(float)))) { | |
43 | sr_err("Failed to malloc data."); | |
7dc55d93 AG |
44 | g_free(analog); |
45 | return; | |
46 | } | |
bbabddbd | 47 | |
bbabddbd | 48 | analog->num_samples = 1; |
7dc55d93 AG |
49 | analog->mq = -1; |
50 | ||
be5c1d3b AG |
51 | sr_dmm_smart_parse_fs9721(data, &rawval, analog); |
52 | *analog->data = rawval; | |
53 | ||
54 | if (data->flags & FLAG_TEMP_CELSIUS) { | |
7dc55d93 | 55 | analog->mq = SR_MQ_TEMPERATURE; |
bbabddbd | 56 | /* No Kelvin or Fahrenheit from the device, just Celsius. */ |
7dc55d93 | 57 | analog->unit = SR_UNIT_CELSIUS; |
7dc55d93 AG |
58 | } |
59 | ||
7dc55d93 AG |
60 | |
61 | if (analog->mq != -1) { | |
62 | /* Got a measurement. */ | |
7dc55d93 AG |
63 | packet.type = SR_DF_ANALOG; |
64 | packet.payload = analog; | |
65 | sr_session_send(devc->cb_data, &packet); | |
66 | devc->num_samples++; | |
67 | } | |
bbabddbd | 68 | |
7dc55d93 AG |
69 | g_free(analog->data); |
70 | g_free(analog); | |
71 | } | |
72 | ||
73 | static void handle_new_data(struct dev_context *devc, int fd) | |
74 | { | |
bbabddbd | 75 | int len, i, offset = 0; |
be5c1d3b AG |
76 | struct fs9721_packet *packet; |
77 | struct fs9721_data data; | |
bbabddbd UH |
78 | |
79 | /* Try to get as much data as the buffer can hold. */ | |
7dc55d93 AG |
80 | len = DMM_BUFSIZE - devc->buflen; |
81 | len = serial_read(fd, devc->buf + devc->buflen, len); | |
82 | if (len < 1) { | |
bbabddbd | 83 | sr_err("Serial port read error: %d.", len); |
7dc55d93 AG |
84 | return; |
85 | } | |
86 | devc->buflen += len; | |
87 | ||
bbabddbd | 88 | /* Now look for packets in that data. */ |
be5c1d3b | 89 | while ((devc->buflen - offset) >= FS9721_PACKET_SIZE) { |
bbabddbd | 90 | packet = (void *)(devc->buf + offset); |
be5c1d3b AG |
91 | if (fs9721_is_packet_valid(packet, &data)) { |
92 | fs9721_serial_handle_packet(&data, devc); | |
93 | offset += FS9721_PACKET_SIZE; | |
7dc55d93 AG |
94 | } else { |
95 | offset++; | |
96 | } | |
97 | } | |
98 | ||
bbabddbd UH |
99 | /* If we have any data left, move it to the beginning of our buffer. */ |
100 | for (i = 0; i < devc->buflen - offset; i++) | |
7dc55d93 AG |
101 | devc->buf[i] = devc->buf[offset + i]; |
102 | devc->buflen -= offset; | |
103 | } | |
104 | ||
bbabddbd | 105 | SR_PRIV int tekpower_dmm_receive_data(int fd, int revents, void *cb_data) |
7dc55d93 AG |
106 | { |
107 | const struct sr_dev_inst *sdi; | |
108 | struct dev_context *devc; | |
109 | ||
110 | if (!(sdi = cb_data)) | |
111 | return TRUE; | |
112 | ||
113 | if (!(devc = sdi->priv)) | |
114 | return TRUE; | |
115 | ||
bbabddbd | 116 | if (revents == G_IO_IN) { |
7dc55d93 AG |
117 | /* Serial data arrived. */ |
118 | handle_new_data(devc, fd); | |
119 | } | |
120 | ||
121 | if (devc->num_samples >= devc->limit_samples) { | |
122 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
123 | return TRUE; | |
124 | } | |
125 | ||
126 | return TRUE; | |
127 | } |