2 * This file is part of the libsigrok project.
4 * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
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.
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.
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
25 #include "libsigrok.h"
26 #include "libsigrok-internal.h"
28 #define LOG_PREFIX "input/chronovu-la8"
30 #define NUM_PACKETS 2048
31 #define PACKET_SIZE 4096
32 #define DEFAULT_NUM_PROBES 8
35 * Convert the LA8 'divcount' value to the respective samplerate (in Hz).
37 * LA8 hardware: sample period = (divcount + 1) * 10ns.
38 * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
39 * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
41 * @param divcount The divcount value as needed by the hardware.
43 * @return The samplerate in Hz, or 0xffffffffffffffff upon errors.
45 static uint64_t divcount_to_samplerate(uint8_t divcount)
48 return 0xffffffffffffffffULL;
50 return SR_MHZ(100) / (divcount + 1);
53 static int format_match(const char *filename)
59 sr_err("%s: filename was NULL", __func__);
60 // return SR_ERR; /* FIXME */
64 if (!g_file_test(filename, G_FILE_TEST_EXISTS)) {
65 sr_err("%s: input file '%s' does not exist",
67 // return SR_ERR; /* FIXME */
71 if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR)) {
72 sr_err("%s: input file '%s' not a regular file",
74 // return SR_ERR; /* FIXME */
78 /* Only accept files of length 8MB + 5 bytes. */
79 ret = stat(filename, &stat_buf);
81 sr_err("%s: Error getting file size of '%s'",
85 if (stat_buf.st_size != (8 * 1024 * 1024 + 5)) {
86 sr_dbg("%s: File size must be exactly 8388613 bytes ("
87 "it actually is %d bytes in size), so this is not a "
88 "ChronoVu LA8 file.", __func__, stat_buf.st_size);
92 /* TODO: Check for divcount != 0xff. */
97 static int init(struct sr_input *in, const char *filename)
99 struct sr_probe *probe;
101 char name[SR_MAX_PROBENAME_LEN + 1];
106 num_probes = DEFAULT_NUM_PROBES;
109 param = g_hash_table_lookup(in->param, "numprobes");
111 num_probes = strtoul(param, NULL, 10);
112 if (num_probes < 1) {
113 sr_err("%s: strtoul failed", __func__);
119 /* Create a virtual device. */
120 in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL);
122 for (i = 0; i < num_probes; i++) {
123 snprintf(name, SR_MAX_PROBENAME_LEN, "%d", i);
124 /* TODO: Check return value. */
125 if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE, name)))
127 in->sdi->probes = g_slist_append(in->sdi->probes, probe);
133 static int loadfile(struct sr_input *in, const char *filename)
135 struct sr_datafeed_packet packet;
136 struct sr_datafeed_meta meta;
137 struct sr_datafeed_logic logic;
138 struct sr_config *src;
139 uint8_t buf[PACKET_SIZE], divcount;
140 int i, fd, size, num_probes;
143 /* TODO: Use glib functions! GIOChannel, g_fopen, etc. */
144 if ((fd = open(filename, O_RDONLY)) == -1) {
145 sr_err("%s: file open failed", __func__);
149 num_probes = g_slist_length(in->sdi->probes);
151 /* Seek to the end of the file, and read the divcount byte. */
152 divcount = 0x00; /* TODO: Don't hardcode! */
154 /* Convert the divcount value to a samplerate. */
155 samplerate = divcount_to_samplerate(divcount);
156 if (samplerate == 0xffffffffffffffffULL) {
157 close(fd); /* FIXME */
160 sr_dbg("%s: samplerate is %" PRIu64, __func__, samplerate);
162 /* Send header packet to the session bus. */
163 std_session_send_df_header(in->sdi, LOG_PREFIX);
165 /* Send metadata about the SR_DF_LOGIC packets to come. */
166 packet.type = SR_DF_META;
167 packet.payload = &meta;
168 src = sr_config_new(SR_CONF_SAMPLERATE, g_variant_new_uint64(samplerate));
169 meta.config = g_slist_append(NULL, src);
170 sr_session_send(in->sdi, &packet);
173 /* TODO: Handle trigger point. */
175 /* Send data packets to the session bus. */
176 sr_dbg("%s: sending SR_DF_LOGIC data packets", __func__);
177 packet.type = SR_DF_LOGIC;
178 packet.payload = &logic;
179 logic.unitsize = (num_probes + 7) / 8;
182 /* Send 8MB of total data to the session bus in small chunks. */
183 for (i = 0; i < NUM_PACKETS; i++) {
184 /* TODO: Handle errors, handle incomplete reads. */
185 size = read(fd, buf, PACKET_SIZE);
187 sr_session_send(in->sdi, &packet);
189 close(fd); /* FIXME */
191 /* Send end packet to the session bus. */
192 sr_dbg("%s: sending SR_DF_END", __func__);
193 packet.type = SR_DF_END;
194 packet.payload = NULL;
195 sr_session_send(in->sdi, &packet);
200 SR_PRIV struct sr_input_format input_chronovu_la8 = {
201 .id = "chronovu-la8",
202 .description = "ChronoVu LA8",
203 .format_match = format_match,
205 .loadfile = loadfile,