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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 | #include <sigrok-internal.h> | |
26 | ||
27 | #define NUM_PACKETS 2048 | |
28 | #define PACKET_SIZE 4096 | |
29 | #define DEFAULT_NUM_PROBES 8 | |
30 | ||
31 | /** | |
32 | * Convert the LA8 'divcount' value to the respective samplerate (in Hz). | |
33 | * | |
34 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
35 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
36 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
37 | * | |
38 | * @param divcount The divcount value as needed by the hardware. | |
39 | * @return The samplerate in Hz, or 0xffffffffffffffff upon errors. | |
40 | */ | |
41 | static uint64_t divcount_to_samplerate(uint8_t divcount) | |
42 | { | |
43 | if (divcount == 0xff) | |
44 | return 0xffffffffffffffffULL; | |
45 | ||
46 | return SR_MHZ(100) / (divcount + 1); | |
47 | } | |
48 | ||
49 | static int format_match(const char *filename) | |
50 | { | |
51 | if (!filename) { | |
52 | sr_warn("la8input: %s: filename was NULL", __func__); | |
53 | // return SR_ERR; /* FIXME */ | |
54 | return FALSE; | |
55 | } | |
56 | ||
57 | if (!g_file_test(filename, G_FILE_TEST_EXISTS)) { | |
58 | sr_warn("la8input: %s: input file '%s' does not exist", | |
59 | __func__, filename); | |
60 | // return SR_ERR; /* FIXME */ | |
61 | return FALSE; | |
62 | } | |
63 | ||
64 | if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR)) { | |
65 | sr_warn("la8input: %s: input file '%s' not a regular file", | |
66 | __func__, filename); | |
67 | // return SR_ERR; /* FIXME */ | |
68 | return FALSE; | |
69 | } | |
70 | ||
71 | /* TODO: Only accept files of length 8MB + 5 bytes. */ | |
72 | ||
73 | /* TODO: Check for divcount != 0xff. */ | |
74 | ||
75 | return TRUE; | |
76 | } | |
77 | ||
78 | static int init(struct sr_input *in) | |
79 | { | |
80 | int num_probes, i; | |
81 | char name[SR_MAX_PROBENAME_LEN]; | |
82 | ||
83 | if (in->param && in->param[0]) { | |
84 | num_probes = strtoul(in->param, NULL, 10); | |
85 | if (num_probes < 1) { | |
86 | sr_warn("la8input: %s: strtoul failed", __func__); | |
87 | return SR_ERR; | |
88 | } | |
89 | } else { | |
90 | num_probes = DEFAULT_NUM_PROBES; | |
91 | } | |
92 | ||
93 | /* Create a virtual device. */ | |
94 | in->vdevice = sr_device_new(NULL, 0); | |
95 | ||
96 | for (i = 0; i < num_probes; i++) { | |
97 | snprintf(name, SR_MAX_PROBENAME_LEN, "%d", i); | |
98 | sr_device_probe_add(in->vdevice, name); /* TODO: Check return value. */ | |
99 | } | |
100 | ||
101 | return SR_OK; | |
102 | } | |
103 | ||
104 | static int loadfile(struct sr_input *in, const char *filename) | |
105 | { | |
106 | struct sr_datafeed_header header; | |
107 | struct sr_datafeed_packet packet; | |
108 | struct sr_datafeed_logic logic; | |
109 | uint8_t buf[PACKET_SIZE], divcount; | |
110 | int i, fd, size, num_probes; | |
111 | uint64_t samplerate; | |
112 | ||
113 | /* TODO: Use glib functions! GIOChannel, g_fopen, etc. */ | |
114 | if ((fd = open(filename, O_RDONLY)) == -1) { | |
115 | sr_warn("la8input: %s: file open failed", __func__); | |
116 | return SR_ERR; | |
117 | } | |
118 | ||
119 | num_probes = g_slist_length(in->vdevice->probes); | |
120 | ||
121 | /* Seek to the end of the file, and read the divcount byte. */ | |
122 | divcount = 0x00; /* TODO: Don't hardcode! */ | |
123 | ||
124 | /* Convert the divcount value to a samplerate. */ | |
125 | samplerate = divcount_to_samplerate(divcount); | |
126 | if (samplerate == 0xffffffffffffffffULL) { | |
127 | close(fd); /* FIXME */ | |
128 | return SR_ERR; | |
129 | } | |
130 | sr_dbg("la8input: %s: samplerate is %" PRIu64, __func__, samplerate); | |
131 | ||
132 | /* Send header packet to the session bus. */ | |
133 | sr_dbg("la8input: %s: sending SR_DF_HEADER packet", __func__); | |
134 | packet.type = SR_DF_HEADER; | |
135 | packet.payload = &header; | |
136 | header.feed_version = 1; | |
137 | gettimeofday(&header.starttime, NULL); | |
138 | header.num_logic_probes = num_probes; | |
139 | header.num_analog_probes = 0; | |
140 | header.samplerate = samplerate; | |
141 | sr_session_bus(in->vdevice, &packet); | |
142 | ||
143 | /* TODO: Handle trigger point. */ | |
144 | ||
145 | /* Send data packets to the session bus. */ | |
146 | sr_dbg("la8input: %s: sending SR_DF_LOGIC data packets", __func__); | |
147 | packet.type = SR_DF_LOGIC; | |
148 | packet.payload = &logic; | |
149 | logic.unitsize = (num_probes + 7) / 8; | |
150 | logic.data = buf; | |
151 | ||
152 | /* Send 8MB of total data to the session bus in small chunks. */ | |
153 | for (i = 0; i < NUM_PACKETS; i++) { | |
154 | /* TODO: Handle errors, handle incomplete reads. */ | |
155 | size = read(fd, buf, PACKET_SIZE); | |
156 | logic.length = PACKET_SIZE; | |
157 | sr_session_bus(in->vdevice, &packet); | |
158 | } | |
159 | close(fd); /* FIXME */ | |
160 | ||
161 | /* Send end packet to the session bus. */ | |
162 | sr_dbg("la8input: %s: sending SR_DF_END", __func__); | |
163 | packet.type = SR_DF_END; | |
164 | packet.payload = NULL; | |
165 | sr_session_bus(in->vdevice, &packet); | |
166 | ||
167 | return SR_OK; | |
168 | } | |
169 | ||
170 | struct sr_input_format input_chronovu_la8 = { | |
171 | .id = "chronovu-la8", | |
172 | .description = "ChronoVu LA8", | |
173 | .format_match = format_match, | |
174 | .init = init, | |
175 | .loadfile = loadfile, | |
176 | }; |