--- /dev/null
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sigrok.h>
+
+#define NUM_PACKETS 2048
+#define PACKET_SIZE 4096
+#define DEFAULT_NUM_PROBES 8
+
+/**
+ * Convert the LA8 'divcount' value to the respective samplerate (in Hz).
+ *
+ * LA8 hardware: sample period = (divcount + 1) * 10ns.
+ * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate).
+ * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate).
+ *
+ * @param divcount The divcount value as needed by the hardware.
+ * @return The samplerate in Hz, or 0xffffffffffffffff upon errors.
+ */
+static uint64_t divcount_to_samplerate(uint8_t divcount)
+{
+ if (divcount == 0xff)
+ return 0xffffffffffffffffULL;
+
+ return SR_MHZ(100) / (divcount + 1);
+}
+
+static int format_match(const char *filename)
+{
+ if (!filename) {
+ g_warning("la8input: %s: filename was NULL", __func__);
+ // return SR_ERR; /* FIXME */
+ return FALSE;
+ }
+
+ if (!g_file_test(filename, G_FILE_TEST_EXISTS)) {
+ g_warning("la8input: %s: input file '%s' does not exist",
+ __func__, filename);
+ // return SR_ERR; /* FIXME */
+ return FALSE;
+ }
+
+ if (!g_file_test(filename, G_FILE_TEST_IS_REGULAR)) {
+ g_warning("la8input: %s: input file '%s' not a regular file",
+ __func__, filename);
+ // return SR_ERR; /* FIXME */
+ return FALSE;
+ }
+
+ /* TODO: Only accept files of length 8MB + 5 bytes. */
+
+ /* TODO: Check for divcount != 0xff. */
+
+ return TRUE;
+}
+
+static int init(struct sr_input *in)
+{
+ int num_probes;
+
+ if (in->param && in->param[0]) {
+ num_probes = strtoul(in->param, NULL, 10);
+ if (num_probes < 1) {
+ g_warning("la8input: %s: strtoul failed", __func__);
+ return SR_ERR;
+ }
+ } else {
+ num_probes = DEFAULT_NUM_PROBES;
+ }
+
+ /* Create a virtual device. */
+ in->vdevice = sr_device_new(NULL, 0, num_probes);
+
+ return SR_OK;
+}
+
+static int loadfile(struct sr_input *in, const char *filename)
+{
+ struct sr_datafeed_header header;
+ struct sr_datafeed_packet packet;
+ uint8_t buf[PACKET_SIZE], divcount;
+ int i, fd, size, num_probes;
+ uint64_t samplerate;
+
+ /* TODO: Use glib functions! GIOChannel, g_fopen, etc. */
+ if ((fd = open(filename, O_RDONLY)) == -1) {
+ g_warning("la8input: %s: file open failed", __func__);
+ return SR_ERR;
+ }
+
+ num_probes = g_slist_length(in->vdevice->probes);
+
+ /* Seek to the end of the file, and read the divcount byte. */
+ divcount = 0x00; /* TODO: Don't hardcode! */
+
+ /* Convert the divcount value to a samplerate. */
+ samplerate = divcount_to_samplerate(divcount);
+ if (samplerate == 0xffffffffffffffffULL) {
+ close(fd); /* FIXME */
+ return SR_ERR;
+ }
+ g_debug("la8input: %s: samplerate is %" PRIu64, __func__, samplerate);
+
+ /* Send header packet to the session bus. */
+ g_debug("la8input: %s: sending SR_DF_HEADER packet", __func__);
+ packet.type = SR_DF_HEADER;
+ packet.length = sizeof(struct sr_datafeed_header);
+ packet.unitsize = 0;
+ packet.payload = &header;
+ header.feed_version = 1;
+ gettimeofday(&header.starttime, NULL);
+ header.num_logic_probes = num_probes;
+ header.num_analog_probes = 0;
+ header.protocol_id = SR_PROTO_RAW;
+ header.samplerate = samplerate;
+ sr_session_bus(in->vdevice, &packet);
+
+ /* TODO: Handle trigger point. */
+
+ /* Send data packets to the session bus. */
+ g_debug("la8input: %s: sending SR_DF_LOGIC data packets", __func__);
+ packet.type = SR_DF_LOGIC;
+ packet.unitsize = (num_probes + 7) / 8;
+ packet.payload = buf;
+
+ /* Send 8MB of total data to the session bus in small chunks. */
+ for (i = 0; i < NUM_PACKETS; i++) {
+ /* TODO: Handle errors, handle incomplete reads. */
+ size = read(fd, buf, PACKET_SIZE);
+ packet.length = PACKET_SIZE;
+ sr_session_bus(in->vdevice, &packet);
+ }
+ close(fd); /* FIXME */
+
+ /* Send end packet to the session bus. */
+ g_debug("la8input: %s: sending SR_DF_END", __func__);
+ packet.type = SR_DF_END;
+ packet.length = 0;
+ packet.unitsize = 0;
+ packet.payload = NULL;
+ sr_session_bus(in->vdevice, &packet);
+
+ return SR_OK;
+}
+
+struct sr_input_format input_chronovu_la8 = {
+ .id = "chronovu-la8",
+ .description = "ChronoVu LA8",
+ .format_match = format_match,
+ .init = init,
+ .loadfile = loadfile,
+};
projects / libsigrok.git / commitdiff