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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 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <stdlib.h> | |
23 | #include <math.h> | |
24 | #include <string.h> | |
25 | #include <glib.h> | |
26 | #include <libsigrok/libsigrok.h> | |
27 | #include "libsigrok-internal.h" | |
28 | #include "protocol.h" | |
29 | ||
30 | static void log_dmm_packet(const uint8_t *buf) | |
31 | { | |
32 | sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x " | |
33 | "%02x %02x %02x %02x %02x %02x %02x %02x %02x " | |
34 | "%02x %02x %02x %02x %02x %02x %02x", | |
35 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], | |
36 | buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], | |
37 | buf[14], buf[15], buf[16], buf[17], buf[18], buf[19], buf[20], | |
38 | buf[21], buf[22]); | |
39 | } | |
40 | ||
41 | static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, | |
42 | void *info) | |
43 | { | |
44 | struct dmm_info *dmm; | |
45 | float floatval; | |
46 | struct sr_datafeed_packet packet; | |
47 | struct sr_datafeed_analog analog; | |
48 | struct sr_analog_encoding encoding; | |
49 | struct sr_analog_meaning meaning; | |
50 | struct sr_analog_spec spec; | |
51 | struct dev_context *devc; | |
52 | ||
53 | dmm = (struct dmm_info *)sdi->driver; | |
54 | ||
55 | log_dmm_packet(buf); | |
56 | devc = sdi->priv; | |
57 | ||
58 | /* Note: digits/spec_digits will be overridden by the DMM parsers. */ | |
59 | sr_analog_init(&analog, &encoding, &meaning, &spec, 0); | |
60 | ||
61 | analog.meaning->channels = sdi->channels; | |
62 | analog.num_samples = 1; | |
63 | analog.meaning->mq = 0; | |
64 | ||
65 | dmm->packet_parse(buf, &floatval, &analog, info); | |
66 | analog.data = &floatval; | |
67 | ||
68 | /* If this DMM needs additional handling, call the resp. function. */ | |
69 | if (dmm->dmm_details) | |
70 | dmm->dmm_details(&analog, info); | |
71 | ||
72 | if (analog.meaning->mq != 0) { | |
73 | /* Got a measurement. */ | |
74 | packet.type = SR_DF_ANALOG; | |
75 | packet.payload = &analog; | |
76 | sr_session_send(sdi, &packet); | |
77 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
78 | } | |
79 | } | |
80 | ||
81 | /** Request packet, if required. */ | |
82 | SR_PRIV int req_packet(struct sr_dev_inst *sdi) | |
83 | { | |
84 | struct dmm_info *dmm; | |
85 | struct dev_context *devc; | |
86 | struct sr_serial_dev_inst *serial; | |
87 | int ret; | |
88 | ||
89 | dmm = (struct dmm_info *)sdi->driver; | |
90 | ||
91 | if (!dmm->packet_request) | |
92 | return SR_OK; | |
93 | ||
94 | devc = sdi->priv; | |
95 | serial = sdi->conn; | |
96 | ||
97 | if (devc->req_next_at && (devc->req_next_at > g_get_monotonic_time())) { | |
98 | sr_spew("Not requesting new packet yet, %" PRIi64 " ms left.", | |
99 | ((devc->req_next_at - g_get_monotonic_time()) / 1000)); | |
100 | return SR_OK; | |
101 | } | |
102 | ||
103 | ret = dmm->packet_request(serial); | |
104 | if (ret < 0) { | |
105 | sr_err("Failed to request packet: %d.", ret); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | if (dmm->req_timeout_ms) | |
110 | devc->req_next_at = g_get_monotonic_time() + (dmm->req_timeout_ms * 1000); | |
111 | ||
112 | return SR_OK; | |
113 | } | |
114 | ||
115 | static void handle_new_data(struct sr_dev_inst *sdi, void *info) | |
116 | { | |
117 | struct dmm_info *dmm; | |
118 | struct dev_context *devc; | |
119 | int len, i, offset = 0; | |
120 | struct sr_serial_dev_inst *serial; | |
121 | ||
122 | dmm = (struct dmm_info *)sdi->driver; | |
123 | ||
124 | devc = sdi->priv; | |
125 | serial = sdi->conn; | |
126 | ||
127 | /* Try to get as much data as the buffer can hold. */ | |
128 | len = DMM_BUFSIZE - devc->buflen; | |
129 | len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len); | |
130 | if (len == 0) | |
131 | return; /* No new bytes, nothing to do. */ | |
132 | if (len < 0) { | |
133 | sr_err("Serial port read error: %d.", len); | |
134 | return; | |
135 | } | |
136 | devc->buflen += len; | |
137 | ||
138 | /* Now look for packets in that data. */ | |
139 | while ((devc->buflen - offset) >= dmm->packet_size) { | |
140 | if (dmm->packet_valid(devc->buf + offset)) { | |
141 | handle_packet(devc->buf + offset, sdi, info); | |
142 | offset += dmm->packet_size; | |
143 | ||
144 | /* Request next packet, if required. */ | |
145 | if (!dmm->packet_request) | |
146 | break; | |
147 | if (dmm->req_timeout_ms || dmm->req_delay_ms) | |
148 | devc->req_next_at = g_get_monotonic_time() + | |
149 | dmm->req_delay_ms * 1000; | |
150 | req_packet(sdi); | |
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 | int receive_data(int fd, int revents, void *cb_data) | |
163 | { | |
164 | struct sr_dev_inst *sdi; | |
165 | struct dev_context *devc; | |
166 | struct dmm_info *dmm; | |
167 | void *info; | |
168 | ||
169 | (void)fd; | |
170 | ||
171 | if (!(sdi = cb_data)) | |
172 | return TRUE; | |
173 | ||
174 | if (!(devc = sdi->priv)) | |
175 | return TRUE; | |
176 | ||
177 | dmm = (struct dmm_info *)sdi->driver; | |
178 | ||
179 | if (revents == G_IO_IN) { | |
180 | /* Serial data arrived. */ | |
181 | info = g_malloc(dmm->info_size); | |
182 | handle_new_data(sdi, info); | |
183 | g_free(info); | |
184 | } else { | |
185 | /* Timeout; send another packet request if DMM needs it. */ | |
186 | if (dmm->packet_request && (req_packet(sdi) < 0)) | |
187 | return FALSE; | |
188 | } | |
189 | ||
190 | if (sr_sw_limits_check(&devc->limits)) | |
191 | sdi->driver->dev_acquisition_stop(sdi); | |
192 | ||
193 | return TRUE; | |
194 | } |