diff options
Diffstat (limited to 'ao-tools/ao-dump-up/ao-dump-up.c')
| -rw-r--r-- | ao-tools/ao-dump-up/ao-dump-up.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/ao-tools/ao-dump-up/ao-dump-up.c b/ao-tools/ao-dump-up/ao-dump-up.c new file mode 100644 index 00000000..6268dc8b --- /dev/null +++ b/ao-tools/ao-dump-up/ao-dump-up.c @@ -0,0 +1,207 @@ +/* + * Copyright © 2009 Keith Packard <keithp@keithp.com> + * + * 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., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <getopt.h> +#include <string.h> +#include "cc-usb.h" +#include "cc.h" + +#define NUM_BLOCK 512 + +static const struct option options[] = { + { .name = "tty", .has_arg = 1, .val = 'T' }, + { .name = "device", .has_arg = 1, .val = 'D' }, + { 0, 0, 0, 0}, +}; + +static void usage(char *program) +{ + fprintf(stderr, "usage: %s [--tty <tty-name>] [--device <device-name>]\n", program); + exit(1); +} + +static uint8_t +log_checksum(int d[8]) +{ + uint8_t sum = 0x5a; + int i; + + for (i = 0; i < 8; i++) + sum += (uint8_t) d[i]; + return -sum; +} + +static int get_nonwhite(struct cc_usb *cc, int timeout) +{ + int c; + + for (;;) { + c = cc_usb_getchar_timeout(cc, timeout); + putchar(c); + if (!isspace(c)) + return c; + } +} + +static uint8_t +get_hexc(struct cc_usb *cc) +{ + int c = get_nonwhite(cc, 1000); + + if ('0' <= c && c <= '9') + return c - '0'; + if ('a' <= c && c <= 'f') + return c - 'a' + 10; + if ('A' <= c && c <= 'F') + return c - 'A' + 10; + fprintf(stderr, "Non-hex char '%c'\n", c); + exit(1); +} + +static int file_crc; + +static const int POLY = 0x8408; + +static int +log_crc(int crc, int b) +{ + int i; + + for (i = 0; i < 8; i++) { + if (((crc & 0x0001) ^ (b & 0x0001)) != 0) + crc = (crc >> 1) ^ POLY; + else + crc = crc >> 1; + b >>= 1; + } + return crc & 0xffff; +} + +static uint8_t +get_hex(struct cc_usb *cc) +{ + int a = get_hexc(cc); + int b = get_hexc(cc); + int h = (a << 4) + b; + + file_crc = log_crc(file_crc, h); + return h; +} + +static int get_32(struct cc_usb *cc) +{ + int v = 0; + int i; + for (i = 0; i < 4; i++) { + v += get_hex(cc) << (i * 8); + } + return v; +} + +static int get_16(struct cc_usb *cc) +{ + int v = 0; + int i; + for (i = 0; i < 2; i++) { + v += get_hex(cc) << (i * 8); + } + return v; +} + +static int swap16(int i) +{ + return ((i << 8) & 0xff00) | ((i >> 8) & 0xff); +} + +static int find_header(struct cc_usb *cc) +{ + for (;;) { + if (get_nonwhite(cc, 0) == 'M' && get_nonwhite(cc, 1000) == 'P') + return 1; + } +} + +static const char *state_names[] = { + "startup", + "idle", + "pad", + "boost", + "fast", + "coast", + "drogue", + "main", + "landed", + "invalid" +}; + + +int +main (int argc, char **argv) +{ + struct cc_usb *cc; + char *tty = NULL; + char *device = NULL; + int c; + char line[8192]; + int nsamples; + int i; + int crc; + int current_crc; + + while ((c = getopt_long(argc, argv, "T:D:", options, NULL)) != -1) { + switch (c) { + case 'T': + tty = optarg; + break; + case 'D': + device = optarg; + break; + default: + usage(argv[0]); + break; + } + } + if (!tty) + tty = cc_usbdevs_find_by_arg(device, "FT230X Basic UART"); + if (!tty) + tty = getenv("ALTOS_TTY"); + if (!tty) + tty="/dev/ttyUSB0"; + cc = cc_usb_open(tty); + if (!cc) + exit(1); + find_header(cc); + file_crc = 0xffff; + get_32(cc); /* ground pressure */ + get_32(cc); /* min pressure */ + nsamples = get_16(cc); /* nsamples */ + for (i = 0; i < nsamples; i++) + get_16(cc); /* sample i */ + current_crc = swap16(~file_crc & 0xffff); + crc = get_16(cc); /* crc */ + putchar ('\n'); + if (crc == current_crc) + printf("CRC valid\n"); + else + printf("CRC invalid\n"); + cc_usb_close(cc); + exit (0); +} |