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1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de> | |
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 2 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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <fcntl.h> | |
23 | #include <unistd.h> | |
24 | #include <sigrok.h> | |
25 | ||
26 | #define NUM_PACKETS 2048 | |
27 | #define PACKET_SIZE 4096 | |
28 | #define DEFAULT_NUM_PROBES 8 | |
29 | ||
30 | /** | |
31 | * Convert the LA8 'divcount' value to the respective samplerate (in Hz). | |
32 | * | |
33 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
34 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
35 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
36 | * | |
37 | * @param divcount The divcount value as needed by the hardware. | |
38 | * @return The samplerate in Hz, or 0xffffffffffffffff upon errors. | |
39 | */ | |
40 | static uint64_t divcount_to_samplerate(uint8_t divcount) | |
41 | { | |
42 | if (divcount == 0xff) | |
43 | return 0xffffffffffffffffULL; | |
44 | ||
45 | return SR_MHZ(100) / (divcount + 1); | |
46 | } | |
47 | ||
48 | static int format_match(const char *filename) | |
49 | { | |
50 | if (!filename) { | |
51 | g_warning("la8input: %s: filename was NULL", __func__); | |
52 | // return SR_ERR; /* FIXME */ | |
53 | return FALSE; | |
54 | } | |
55 | ||
56 | if (!g_file_test(filename, G_FILE_TEST_EXISTS)) { | |
57 | g_warning("la8input: %s: input file '%s' does not exist", | |
58 | __func__, filename); | |
59 | // return SR_ERR; /* FIXME */ | |
60 | return FALSE; | |
61 | } | |
62 | ||
63 | if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR)) { | |
64 | g_warning("la8input: %s: input file '%s' not a regular file", | |
65 | __func__, filename); | |
66 | // return SR_ERR; /* FIXME */ | |
67 | return FALSE; | |
68 | } | |
69 | ||
70 | /* TODO: Only accept files of length 8MB + 5 bytes. */ | |
71 | ||
72 | /* TODO: Check for divcount != 0xff. */ | |
73 | ||
74 | return TRUE; | |
75 | } | |
76 | ||
77 | static int init(struct sr_input *in) | |
78 | { | |
79 | int num_probes; | |
80 | ||
81 | if (in->param && in->param[0]) { | |
82 | num_probes = strtoul(in->param, NULL, 10); | |
83 | if (num_probes < 1) { | |
84 | g_warning("la8input: %s: strtoul failed", __func__); | |
85 | return SR_ERR; | |
86 | } | |
87 | } else { | |
88 | num_probes = DEFAULT_NUM_PROBES; | |
89 | } | |
90 | ||
91 | /* Create a virtual device. */ | |
92 | in->vdevice = sr_device_new(NULL, 0, num_probes); | |
93 | ||
94 | return SR_OK; | |
95 | } | |
96 | ||
97 | static int loadfile(struct sr_input *in, const char *filename) | |
98 | { | |
99 | struct sr_datafeed_header header; | |
100 | struct sr_datafeed_packet packet; | |
101 | uint8_t buf[PACKET_SIZE], divcount; | |
102 | int i, fd, size, num_probes; | |
103 | uint64_t samplerate; | |
104 | ||
105 | /* TODO: Use glib functions! GIOChannel, g_fopen, etc. */ | |
106 | if ((fd = open(filename, O_RDONLY)) == -1) { | |
107 | g_warning("la8input: %s: file open failed", __func__); | |
108 | return SR_ERR; | |
109 | } | |
110 | ||
111 | num_probes = g_slist_length(in->vdevice->probes); | |
112 | ||
113 | /* Seek to the end of the file, and read the divcount byte. */ | |
114 | divcount = 0x00; /* TODO: Don't hardcode! */ | |
115 | ||
116 | /* Convert the divcount value to a samplerate. */ | |
117 | samplerate = divcount_to_samplerate(divcount); | |
118 | if (samplerate == 0xffffffffffffffffULL) { | |
119 | close(fd); /* FIXME */ | |
120 | return SR_ERR; | |
121 | } | |
122 | g_debug("la8input: %s: samplerate is %" PRIu64, __func__, samplerate); | |
123 | ||
124 | /* Send header packet to the session bus. */ | |
125 | g_debug("la8input: %s: sending SR_DF_HEADER packet", __func__); | |
126 | packet.type = SR_DF_HEADER; | |
127 | packet.length = sizeof(struct sr_datafeed_header); | |
128 | packet.unitsize = 0; | |
129 | packet.payload = &header; | |
130 | header.feed_version = 1; | |
131 | gettimeofday(&header.starttime, NULL); | |
132 | header.num_logic_probes = num_probes; | |
133 | header.num_analog_probes = 0; | |
134 | header.protocol_id = SR_PROTO_RAW; | |
135 | header.samplerate = samplerate; | |
136 | sr_session_bus(in->vdevice, &packet); | |
137 | ||
138 | /* TODO: Handle trigger point. */ | |
139 | ||
140 | /* Send data packets to the session bus. */ | |
141 | g_debug("la8input: %s: sending SR_DF_LOGIC data packets", __func__); | |
142 | packet.type = SR_DF_LOGIC; | |
143 | packet.unitsize = (num_probes + 7) / 8; | |
144 | packet.payload = buf; | |
145 | ||
146 | /* Send 8MB of total data to the session bus in small chunks. */ | |
147 | for (i = 0; i < NUM_PACKETS; i++) { | |
148 | /* TODO: Handle errors, handle incomplete reads. */ | |
149 | size = read(fd, buf, PACKET_SIZE); | |
150 | packet.length = PACKET_SIZE; | |
151 | sr_session_bus(in->vdevice, &packet); | |
152 | } | |
153 | close(fd); /* FIXME */ | |
154 | ||
155 | /* Send end packet to the session bus. */ | |
156 | g_debug("la8input: %s: sending SR_DF_END", __func__); | |
157 | packet.type = SR_DF_END; | |
158 | packet.length = 0; | |
159 | packet.unitsize = 0; | |
160 | packet.payload = NULL; | |
161 | sr_session_bus(in->vdevice, &packet); | |
162 | ||
163 | return SR_OK; | |
164 | } | |
165 | ||
166 | struct sr_input_format input_chronovu_la8 = { | |
167 | .id = "chronovu-la8", | |
168 | .description = "ChronoVu LA8", | |
169 | .format_match = format_match, | |
170 | .init = init, | |
171 | .loadfile = loadfile, | |
172 | }; |