RE : [lwip-users] Examples/Documentation Incorrect Timeout Code

[Frédéric BERNON]

I suppose you use a old lwIP release. Can you tell us which one you use? Is your release provided by any company, or do you take it from the Savannah web site ?

 

 

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Frédéric BERNON
HYMATOM SA
Chef de projet informatique
Microsoft Certified Professional
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-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de HM2
Envoyé : lundi 27 avril 2009 12:06
À : Mailing list for lwIP users
Objet : [lwip-users] Examples/Documentation Incorrect Timeout Code

I think there is a mistake in the examples and documentation.

There are many places where timeouts are given as below:

if ( (clock()-last_arp_time) >= (ARP_TMR_INTERVAL * CLOCK_MS) )

Assuming that clock() and last_arp_time are given as ticks,

and assuming that ARP_TMR_INTERVAL is going to be given in mSec,
and CLOCK_MS is the number of mSec/tick, then the above is incorrect.

The units would be: (ticks-ticks = mSec * mSec/Tick)     That's wrong.

The correct formula should be:

if ( (clock()-last_arp_time) >= (ARP_TMR_INTERVAL / CLOCK_MS) )

The units are: (ticks-ticks = mSec * ticks/mSec)  or (ticks = ticks)

Chris.

Frédéric BERNON.vcf
Description: Frédéric BERNON.vcf