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Ensure that DEFAULT_PERIOD is != 0, to avoid a modulo with 0

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adamdunkels 2009-10-19 06:39:29 +00:00
parent f25856a387
commit 10c873018d
1 changed files with 10 additions and 1 deletions
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11
core/net/mac/xmac.c
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@ -28,7 +28,7 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* $Id: xmac.c,v 1.36 2009/10/18 13:19:25 adamdunkels Exp $ * $Id: xmac.c,v 1.37 2009/10/19 06:39:29 adamdunkels Exp $
*/ */
/** /**
@ -105,6 +105,15 @@ struct xmac_hdr {
#define DEFAULT_PERIOD (DEFAULT_OFF_TIME + DEFAULT_ON_TIME) #define DEFAULT_PERIOD (DEFAULT_OFF_TIME + DEFAULT_ON_TIME)
/* On some platforms, we may end up with a DEFAULT_PERIOD that is 0
which will make compilation fail due to a modulo operation in the
code. To ensure that DEFAULT_PERIOD is greater than zero, we use
the construct below. */
#if DEFAULT_PERIOD == 0
#undef DEFAULT_PERIOD
#define DEFAULT_PERIOD 1
#endif
/* The cycle time for announcements. */ /* The cycle time for announcements. */
#define ANNOUNCEMENT_PERIOD 4 * CLOCK_SECOND #define ANNOUNCEMENT_PERIOD 4 * CLOCK_SECOND