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Add documentation on the CAN filter value, must include CAN_EFF_FLAG

pull/109/head
Nick Elmschig 2018-10-22 12:50:24 -07:00
parent b0190b9d6e
commit 104e08ea70
1 changed files with 1 additions and 0 deletions
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candump.c
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@ -147,6 +147,7 @@ void print_usage(char *prg)
fprintf(stderr, "\nCAN IDs, masks and data content are given and expected in hexadecimal values.\n"); fprintf(stderr, "\nCAN IDs, masks and data content are given and expected in hexadecimal values.\n");
fprintf(stderr, "When can_id and can_mask are both 8 digits, they are assumed to be 29 bit EFF.\n"); fprintf(stderr, "When can_id and can_mask are both 8 digits, they are assumed to be 29 bit EFF.\n");
fprintf(stderr, "Without any given filter all data frames are received ('0:0' default filter).\n"); fprintf(stderr, "Without any given filter all data frames are received ('0:0' default filter).\n");
fprintf(stderr, "The filter value is directly passed to the SocketCAN interface, and must set CAN_EFF_FLAG (0x80000000) correctly.");
fprintf(stderr, "\nUse interface name '%s' to receive from all CAN interfaces.\n", ANYDEV); fprintf(stderr, "\nUse interface name '%s' to receive from all CAN interfaces.\n", ANYDEV);
fprintf(stderr, "\nExamples:\n"); fprintf(stderr, "\nExamples:\n");
fprintf(stderr, "%s -c -c -ta can0,123:7FF,400:700,#000000FF can2,400~7F0 can3 can8\n", prg); fprintf(stderr, "%s -c -c -ta can0,123:7FF,400:700,#000000FF can2,400~7F0 can3 can8\n", prg);