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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Janne Huttunen <jahuttun@gmail.com> | |
5 | * Copyright (C) 2019 Gerhard Sittig <gerhard.sittig@gmx.net> | |
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 <libsigrok/libsigrok.h> | |
22 | #include <libsigrok-internal.h> | |
23 | #include "protocol.h" | |
24 | #include <stdint.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | ||
28 | static void send_frame_start(struct sr_dev_inst *sdi) | |
29 | { | |
30 | struct dev_context *devc; | |
31 | struct lcr_parse_info *info; | |
32 | uint64_t freq; | |
33 | const char *model; | |
34 | ||
35 | devc = sdi->priv; | |
36 | info = &devc->parse_info; | |
37 | ||
38 | /* Communicate changes of frequency or model before data values. */ | |
39 | freq = info->output_freq; | |
40 | if (freq != devc->output_freq) { | |
41 | devc->output_freq = freq; | |
42 | sr_session_send_meta(sdi, SR_CONF_OUTPUT_FREQUENCY, | |
43 | g_variant_new_double(freq)); | |
44 | } | |
45 | model = info->circuit_model; | |
46 | if (model && model != devc->circuit_model) { | |
47 | devc->circuit_model = model; | |
48 | sr_session_send_meta(sdi, SR_CONF_EQUIV_CIRCUIT_MODEL, | |
49 | g_variant_new_string(model)); | |
50 | } | |
51 | ||
52 | /* Data is about to get sent. Start a new frame. */ | |
53 | std_session_send_df_frame_begin(sdi); | |
54 | } | |
55 | ||
56 | static int handle_packet(struct sr_dev_inst *sdi, const uint8_t *pkt) | |
57 | { | |
58 | struct dev_context *devc; | |
59 | struct lcr_parse_info *info; | |
60 | const struct lcr_info *lcr; | |
61 | size_t ch_idx; | |
62 | int rc; | |
63 | float value; | |
64 | struct sr_datafeed_packet packet; | |
65 | struct sr_datafeed_analog analog; | |
66 | struct sr_analog_encoding encoding; | |
67 | struct sr_analog_meaning meaning; | |
68 | struct sr_analog_spec spec; | |
69 | gboolean frame; | |
70 | struct sr_channel *channel; | |
71 | ||
72 | devc = sdi->priv; | |
73 | info = &devc->parse_info; | |
74 | lcr = devc->lcr_info; | |
75 | ||
76 | /* Note: digits/spec_digits will be overridden later. */ | |
77 | sr_analog_init(&analog, &encoding, &meaning, &spec, 0); | |
78 | analog.num_samples = 1; | |
79 | analog.data = &value; | |
80 | ||
81 | frame = FALSE; | |
82 | for (ch_idx = 0; ch_idx < lcr->channel_count; ch_idx++) { | |
83 | channel = g_slist_nth_data(sdi->channels, ch_idx); | |
84 | analog.meaning->channels = g_slist_append(NULL, channel); | |
85 | info->ch_idx = ch_idx; | |
86 | rc = lcr->packet_parse(pkt, &value, &analog, info); | |
87 | if (sdi->session && rc == SR_OK && analog.meaning->mq && channel->enabled) { | |
88 | if (!frame) { | |
89 | send_frame_start(sdi); | |
90 | frame = TRUE; | |
91 | } | |
92 | packet.type = SR_DF_ANALOG; | |
93 | packet.payload = &analog; | |
94 | sr_session_send(sdi, &packet); | |
95 | } | |
96 | g_slist_free(analog.meaning->channels); | |
97 | } | |
98 | if (frame) { | |
99 | std_session_send_df_frame_end(sdi); | |
100 | sr_sw_limits_update_frames_read(&devc->limits, 1); | |
101 | } | |
102 | ||
103 | return SR_OK; | |
104 | } | |
105 | ||
106 | static int handle_new_data(struct sr_dev_inst *sdi) | |
107 | { | |
108 | struct dev_context *devc; | |
109 | struct sr_serial_dev_inst *serial; | |
110 | ssize_t rdsize; | |
111 | const struct lcr_info *lcr; | |
112 | uint8_t *pkt; | |
113 | size_t copy_len; | |
114 | ||
115 | devc = sdi->priv; | |
116 | serial = sdi->conn; | |
117 | ||
118 | /* Read another chunk of data into the buffer. */ | |
119 | rdsize = sizeof(devc->buf) - devc->buf_rxpos; | |
120 | rdsize = serial_read_nonblocking(serial, &devc->buf[devc->buf_rxpos], rdsize); | |
121 | if (rdsize < 0) | |
122 | return SR_ERR_IO; | |
123 | devc->buf_rxpos += rdsize; | |
124 | ||
125 | /* | |
126 | * Process as many packets as the buffer might contain. Assume | |
127 | * that the stream is synchronized in the typical case. Re-sync | |
128 | * in case of mismatch (skip individual bytes until data matches | |
129 | * the expected packet layout again). | |
130 | */ | |
131 | lcr = devc->lcr_info; | |
132 | while (devc->buf_rxpos >= lcr->packet_size) { | |
133 | pkt = &devc->buf[0]; | |
134 | if (!lcr->packet_valid(pkt)) { | |
135 | copy_len = devc->buf_rxpos - 1; | |
136 | memmove(&devc->buf[0], &devc->buf[1], copy_len); | |
137 | devc->buf_rxpos--; | |
138 | continue; | |
139 | } | |
140 | (void)handle_packet(sdi, pkt); | |
141 | copy_len = devc->buf_rxpos - lcr->packet_size; | |
142 | memmove(&devc->buf[0], &devc->buf[lcr->packet_size], copy_len); | |
143 | devc->buf_rxpos -= lcr->packet_size; | |
144 | } | |
145 | ||
146 | return SR_OK; | |
147 | } | |
148 | ||
149 | static int handle_timeout(struct sr_dev_inst *sdi) | |
150 | { | |
151 | struct dev_context *devc; | |
152 | const struct lcr_info *lcr; | |
153 | struct sr_serial_dev_inst *serial; | |
154 | int64_t now; | |
155 | int ret; | |
156 | ||
157 | devc = sdi->priv; | |
158 | lcr = devc->lcr_info; | |
159 | ||
160 | if (!lcr->packet_request) | |
161 | return SR_OK; | |
162 | ||
163 | now = g_get_monotonic_time(); | |
164 | if (devc->req_next_at && now < devc->req_next_at) | |
165 | return SR_OK; | |
166 | ||
167 | serial = sdi->conn; | |
168 | ret = lcr->packet_request(serial); | |
169 | if (ret < 0) { | |
170 | sr_err("Failed to request packet: %d.", ret); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | if (lcr->req_timeout_ms) | |
175 | devc->req_next_at = now + lcr->req_timeout_ms * 1000; | |
176 | ||
177 | return SR_OK; | |
178 | } | |
179 | ||
180 | SR_PRIV int lcr_receive_data(int fd, int revents, void *cb_data) | |
181 | { | |
182 | struct sr_dev_inst *sdi; | |
183 | struct dev_context *devc; | |
184 | int ret; | |
185 | ||
186 | (void)fd; | |
187 | ||
188 | if (!(sdi = cb_data)) | |
189 | return TRUE; | |
190 | if (!(devc = sdi->priv)) | |
191 | return TRUE; | |
192 | ||
193 | if (revents == G_IO_IN) | |
194 | ret = handle_new_data(sdi); | |
195 | else | |
196 | ret = handle_timeout(sdi); | |
197 | if (sr_sw_limits_check(&devc->limits)) | |
198 | sr_dev_acquisition_stop(sdi); | |
199 | if (ret != SR_OK) | |
200 | return FALSE; | |
201 | ||
202 | return TRUE; | |
203 | } |