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cansend: enhance help text for length info in RTR frames 

In 'classic' CAN 2.0 the RTR frames contain a length information in the
can_dlc field of a CAN frame control section. This length can be passed
to 'cansend' which has not been documented in the help text so far.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
pull/129/head
Oliver Hartkopp 2019-02-13 14:55:47 +01:00
parent 2328c6cfa0
commit 46d620b27c
1 changed files with 4 additions and 1 deletions
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5
cansend.c
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@ -75,11 +75,14 @@ int main(int argc, char **argv)
required_mtu = parse_canframe(argv[2], &frame);
if (!required_mtu){
fprintf(stderr, "\nWrong CAN-frame format! Try:\n\n");
fprintf(stderr, " <can_id>#{R|data} for CAN 2.0 frames\n");
fprintf(stderr, " <can_id>#{data} for 'classic' CAN 2.0 data frames\n");
fprintf(stderr, " <can_id>#R{len} for 'classic' CAN 2.0 RTR frames\n");
fprintf(stderr, " <can_id>##<flags>{data} for CAN FD frames\n\n");
fprintf(stderr, "<can_id> can have 3 (SFF) or 8 (EFF) hex chars\n");
fprintf(stderr, "{data} has 0..8 (0..64 CAN FD) ASCII hex-values (optionally");
fprintf(stderr, " separated by '.')\n");
fprintf(stderr, "{len} is an optional 0..8 value as RTR frames can contain a");
fprintf(stderr, " valid dlc field\n");
fprintf(stderr, "<flags> a single ASCII Hex value (0 .. F) which defines");
fprintf(stderr, " canfd_frame.flags\n\n");
fprintf(stderr, "e.g. 5A1#11.2233.44556677.88 / 123#DEADBEEF / 5AA# / ");