libsigrok/input/input_chronovu_la8.c

171 lines
4.7 KiB
C

/*
* 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>
#include <sigrok-internal.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) {
sr_warn("la8input: %s: filename was NULL", __func__);
// return SR_ERR; /* FIXME */
return FALSE;
}
if (!g_file_test(filename, G_FILE_TEST_EXISTS)) {
sr_warn("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)) {
sr_warn("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) {
sr_warn("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;
struct sr_datafeed_logic logic;
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) {
sr_warn("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;
}
sr_dbg("la8input: %s: samplerate is %" PRIu64, __func__, samplerate);
/* Send header packet to the session bus. */
sr_dbg("la8input: %s: sending SR_DF_HEADER packet", __func__);
packet.type = SR_DF_HEADER;
packet.payload = &header;
header.feed_version = 1;
gettimeofday(&header.starttime, NULL);
header.num_logic_probes = num_probes;
header.num_analog_probes = 0;
header.samplerate = samplerate;
sr_session_bus(in->vdevice, &packet);
/* TODO: Handle trigger point. */
/* Send data packets to the session bus. */
sr_dbg("la8input: %s: sending SR_DF_LOGIC data packets", __func__);
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.unitsize = (num_probes + 7) / 8;
logic.data = 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);
logic.length = PACKET_SIZE;
sr_session_bus(in->vdevice, &packet);
}
close(fd); /* FIXME */
/* Send end packet to the session bus. */
sr_dbg("la8input: %s: sending SR_DF_END", __func__);
packet.type = SR_DF_END;
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,
};