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1 | /* | |
2 | * This file is part of the libsigrok 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 | #ifndef LIBSIGROK_HARDWARE_BRYMEN_DMM_PROTOCOL_H | |
21 | #define LIBSIGROK_HARDWARE_BRYMEN_DMM_PROTOCOL_H | |
22 | ||
23 | #include <stdint.h> | |
24 | #include <string.h> | |
25 | #include <stdlib.h> | |
26 | #include <math.h> | |
27 | #include <glib.h> | |
28 | #include <libsigrok/libsigrok.h> | |
29 | #include "libsigrok-internal.h" | |
30 | ||
31 | #define LOG_PREFIX "brymen-dmm" | |
32 | ||
33 | #define DMM_BUFSIZE 256 | |
34 | ||
35 | enum packet_len_status { | |
36 | PACKET_HEADER_OK, | |
37 | PACKET_NEED_MORE_DATA, | |
38 | PACKET_INVALID_HEADER, | |
39 | }; | |
40 | ||
41 | /** Private, per-device-instance driver context. */ | |
42 | struct dev_context { | |
43 | /** The current sampling limit (in number of samples). */ | |
44 | uint64_t limit_samples; | |
45 | ||
46 | /** The current sampling limit (in ms). */ | |
47 | uint64_t limit_msec; | |
48 | ||
49 | /** Opaque pointer passed in by the frontend. */ | |
50 | void *cb_data; | |
51 | ||
52 | /** The current number of already received samples. */ | |
53 | uint64_t num_samples; | |
54 | ||
55 | /** Start time of acquisition session */ | |
56 | int64_t starttime; | |
57 | ||
58 | uint8_t buf[DMM_BUFSIZE]; | |
59 | int bufoffset; | |
60 | int buflen; | |
61 | int next_packet_len; | |
62 | }; | |
63 | ||
64 | /** | |
65 | * Callback that assesses the size and status of the incoming packet. | |
66 | * | |
67 | * @return PACKET_HEADER_OK - This is a proper packet header. | |
68 | * PACKET_NEED_MORE_DATA The buffer does not contain the entire header. | |
69 | * PACKET_INVALID_HEADER Not a valid start of packet. | |
70 | */ | |
71 | typedef int (*packet_length_t)(const uint8_t *buf, int *len); | |
72 | ||
73 | SR_PRIV int brymen_dmm_receive_data(int fd, int revents, void *cb_data); | |
74 | SR_PRIV int brymen_packet_request(struct sr_serial_dev_inst *serial); | |
75 | ||
76 | SR_PRIV int brymen_packet_length(const uint8_t *buf, int *len); | |
77 | SR_PRIV gboolean brymen_packet_is_valid(const uint8_t *buf); | |
78 | ||
79 | SR_PRIV int brymen_parse(const uint8_t *buf, float *floatval, | |
80 | struct sr_datafeed_analog_old *analog, void *info); | |
81 | ||
82 | SR_PRIV int brymen_stream_detect(struct sr_serial_dev_inst *serial, | |
83 | uint8_t *buf, size_t *buflen, | |
84 | packet_length_t get_packet_size, | |
85 | packet_valid_callback is_valid, | |
86 | uint64_t timeout_ms, int baudrate); | |
87 | ||
88 | #endif |