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Added guard code so that OFF_TIME is never zero

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This commit is contained in:
adamdunkels 2009-04-03 20:08:05 +00:00
parent 8dbd2b2337
commit ed1e945e66
1 changed files with 11 additions and 1 deletions
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12
core/net/mac/lpp.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: lpp.c,v 1.17 2009/04/03 19:59:22 adamdunkels Exp $
* $Id: lpp.c,v 1.18 2009/04/03 20:08:05 adamdunkels Exp $
*/
/**
@ -110,6 +110,16 @@ static clock_time_t off_time_adjustment = 0;
#define LISTEN_TIME (CLOCK_SECOND / 128)
#define OFF_TIME (CLOCK_SECOND / 4)
/* If CLOCK_SECOND is less than 4, we may end up with an OFF_TIME that
is 0 which will make compilation fail due to a modulo operation in
the code. To ensure that OFF_TIME is greater than zero, we use the
construct below. */
#if OFF_TIME == 0
#undef OFF_TIME
#define OFF_TIME 1
#endif
#define PACKET_LIFETIME (LISTEN_TIME + OFF_TIME)
#define UNICAST_TIMEOUT (2 * PACKET_LIFETIME)
#define PROBE_AFTER_TRANSMISSION_TIME (LISTEN_TIME * 2)