114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
|
|
* ALDL Dashboard, core 160 baud handling code
|
|
*
|
|
* (c) 2019 Solomon Peachy <pizza@shaftnet.org>
|
|
*
|
|
* The latest version of this program can be found at:
|
|
*
|
|
* http://git.shaftnet.org/cgit/users/pizza/public/aldl_pi.git
|
|
*
|
|
* 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 3 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* [http://www.gnu.org/licenses/gpl-3.0.html]
|
|
*
|
|
* SPDX-License-Identifier: GPL-3.0+
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "aldl.h"
|
|
|
|
/* shift register & sync word */
|
|
#define SYNC_WORD 0x1ff
|
|
#define MAX_STREAM_WORDS 255
|
|
static uint16_t ALDLSR = 0;
|
|
static uint8_t bits = 0;
|
|
static int datalen = 0;
|
|
static uint8_t data[MAX_STREAM_WORDS];
|
|
|
|
int gotsync = 0;
|
|
|
|
static FILE *datalog_handle;
|
|
|
|
struct stream_common decoded = { 0 };
|
|
|
|
void (*aldl_callback)(uint8_t *data, int datalen) = NULL;
|
|
|
|
|
|
/* Datalogging */
|
|
void datalog_init(char *fname)
|
|
{
|
|
datalog_handle = fopen(fname, "a");
|
|
if (!datalog_handle)
|
|
perror("Can't open datalog file!\n");
|
|
fprintf(datalog_handle, "# New session\n");
|
|
}
|
|
|
|
void datalog_close(void)
|
|
{
|
|
if (datalog_handle)
|
|
fclose(datalog_handle);
|
|
}
|
|
|
|
static void aldl_datalog(uint8_t *data, int datalen)
|
|
{
|
|
int i;
|
|
|
|
if (!datalog_handle) return;
|
|
|
|
fprintf(datalog_handle, "%ld", time(NULL));
|
|
|
|
for (i = 0 ; i < datalen ; i++) {
|
|
fprintf(datalog_handle, ",%02x", *data++);
|
|
}
|
|
fprintf(datalog_handle, "\n");
|
|
}
|
|
|
|
/* ISR */
|
|
void isrfn(void)
|
|
{
|
|
int val;
|
|
delayfn(1); // To handle both variations, minimum of 0.5, max of 1.8
|
|
val = readbit();
|
|
ALDLSR <<= 1;
|
|
ALDLSR |= (val & 1);
|
|
|
|
/* Wait for initial sync. */
|
|
if (!gotsync) {
|
|
if ((ALDLSR & SYNC_WORD) == SYNC_WORD) {
|
|
gotsync = 1;
|
|
}
|
|
return; /* No sync, drop everything */
|
|
}
|
|
|
|
if ((ALDLSR & SYNC_WORD) == SYNC_WORD) {
|
|
/* New sync word, we've finished a sequence */
|
|
if (aldl_callback)
|
|
aldl_callback(data, datalen);
|
|
if (datalog_handle)
|
|
aldl_datalog(data, datalen);
|
|
bits = 0;
|
|
datalen = 0;
|
|
} else if (++bits == 9) {
|
|
/* Just latch in the word */
|
|
data[datalen++] = ALDLSR & 0xff;
|
|
bits = 0;
|
|
}
|
|
}
|