Add chronovu-la8 input file format support.

input/Makefile.am

@@ -22,6 +22,7 @@ noinst_LTLIBRARIES = libsigrokinput.la
 
 libsigrokinput_la_SOURCES = \
 	input_binary.c \
+	input_chronovu_la8.c \
 	input.c
 
 libsigrokinput_la_CFLAGS = \

input/input.c

@@ -19,9 +19,11 @@
 
 #include <sigrok.h>
 
+extern struct sr_input_format input_chronovu_la8;
 extern struct sr_input_format input_binary;
 
 static struct sr_input_format *input_module_list[] = {
+	&input_chronovu_la8,
 	/* This one has to be last, because it will take any input. */
 	&input_binary,
 	NULL,

input/input_chronovu_la8.c

@@ -0,0 +1,172 @@
+/*
+ * 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,
+};