-/*
- * $Id$
- */
-
/*
* canbusload.c
*
#include <linux/can/raw.h>
#include "terminal.h"
+#include "canframelen.h"
#define MAXSOCK 16 /* max. number of CAN interfaces given on the cmdline */
static unsigned char timestamp;
static unsigned char color;
static unsigned char bargraph;
-static unsigned char ignore_bitstuffing;
+static enum cfl_mode mode = CFL_WORSTCASE;
static char *prg;
void print_usage(char *prg)
fprintf(stderr, " -c (colorize lines)\n");
fprintf(stderr, " -b (show bargraph in %d%% resolution)\n", PERCENTRES);
fprintf(stderr, " -r (redraw the terminal - similar to top)\n");
- fprintf(stderr, " -i (ignore bitstuffing estimation in bandwith calculation)\n");
+ fprintf(stderr, " -i (ignore bitstuffing in bandwidth calculation)\n");
+ fprintf(stderr, " -e (exact calculation of stuffed bits)\n");
fprintf(stderr, "\n");
fprintf(stderr, "Up to %d CAN interfaces with mandatory bitrate can be specified on the \n", MAXSOCK);
fprintf(stderr, "commandline in the form: <ifname>@<bitrate>\n\n");
fprintf(stderr, "(interface) (received CAN frames) (used bits total) (used bits for payload)\n");
fprintf(stderr, "\nExample:\n");
fprintf(stderr, "\nuser$> canbusload can0@100000 can1@500000 can2@500000 can3@500000 -r -t -b -c\n\n");
- fprintf(stderr, "%s 2008-05-27 15:18:49\n", prg);
- fprintf(stderr, " can0@100000 805 74491 36656 74%% |XXXXXXXXXXXXXX......|\n");
- fprintf(stderr, " can1@500000 796 75140 37728 15%% |XXX.................|\n");
- fprintf(stderr, " can2@500000 0 0 0 0%% |....................|\n");
- fprintf(stderr, " can3@500000 47 4633 2424 0%% |....................|\n");
+ fprintf(stderr, "%s 2014-02-01 21:13:16 (worst case bitstuffing)\n", prg);
+ fprintf(stderr, " can0@100000 805 74491 36656 74%% |XXXXXXXXXXXXXX......|\n");
+ fprintf(stderr, " can1@500000 796 75140 37728 15%% |XXX.................|\n");
+ fprintf(stderr, " can2@500000 0 0 0 0%% |....................|\n");
+ fprintf(stderr, " can3@500000 47 4633 2424 0%% |....................|\n");
fprintf(stderr, "\n");
}
localtime_r(&currtime, &now);
- printf("%s %04d-%02d-%02d %02d:%02d:%02d\n",
+ printf("%s %04d-%02d-%02d %02d:%02d:%02d ",
prg,
now.tm_year + 1900,
now.tm_mon + 1,
now.tm_hour,
now.tm_min,
now.tm_sec);
+
+ switch (mode) {
+
+ case CFL_NO_BITSTUFFING:
+ /* plain bit calculation without bitstuffing */
+ printf("(ignore bitstuffing)\n");
+ break;
+
+ case CFL_WORSTCASE:
+ /* worst case estimation - see above */
+ printf("(worst case bitstuffing)\n");
+ break;
+
+ case CFL_EXACT:
+ /* exact calculation of stuffed bits based on frame content and CRC */
+ printf("(exact bitstuffing)\n");
+ break;
+
+ default:
+ printf("(unknown bitstuffing)\n");
+ break;
+ }
}
for (i=0; i<currmax; i++) {
else
percent = 0;
- printf(" %*s@%-*d %4d %6d %6d %3d%%",
+ printf(" %*s@%-*d %5d %7d %6d %3d%%",
max_devname_len, stat[i].devname,
max_bitrate_len, stat[i].bitrate,
stat[i].recv_frames,
if (bargraph) {
- printf(" |");
+ printf(" |");
if (percent > 100)
percent = 100;
prg = basename(argv[0]);
- while ((opt = getopt(argc, argv, "rtbcih?")) != -1) {
+ while ((opt = getopt(argc, argv, "rtbcieh?")) != -1) {
switch (opt) {
case 'r':
redraw = 1;
break;
case 'i':
- ignore_bitstuffing = 1;
+ mode = CFL_NO_BITSTUFFING;
+ break;
+
+ case 'e':
+ mode = CFL_EXACT;
break;
default:
stat[i].recv_frames++;
stat[i].recv_bits_payload += frame.can_dlc*8;
-
- /*
- * Following Ken Tindells *worst* case calculation for stuff-bits
- * (see "Guaranteeing Message Latencies on Controller Area Network" 1st ICC'94)
- * the needed bits on the wire can be calculated as:
- *
- * (34 + 8n)/5 + 47 + 8n for SFF frames (11 bit CAN-ID) => (269 + 48n)/5
- * (54 + 8n)/5 + 67 + 8n for EFF frames (29 bit CAN-ID) => (389 + 48n)/5
- *
- * while 'n' is the data length code (number of payload bytes)
- *
- */
-
- if (ignore_bitstuffing) {
- /* calculation without bitstuffing */
- if (frame.can_id & CAN_EFF_FLAG)
- stat[i].recv_bits_total += 67 + frame.can_dlc*8;
- else
- stat[i].recv_bits_total += 47 + frame.can_dlc*8;
- } else {
- /* needed bits including estimated worst case stuff bits */
- if (frame.can_id & CAN_EFF_FLAG)
- stat[i].recv_bits_total += (389 + frame.can_dlc*48)/5;
- else
- stat[i].recv_bits_total += (269 + frame.can_dlc*48)/5;
- }
+ stat[i].recv_bits_total += can_frame_length((struct canfd_frame*)&frame,
+ mode, sizeof(frame));
}
}
}