[lwip-devel] [bug #36905] SNTP problem with SNTP_STARTUP_DELAY symbol

[Freddie Chopin]

URL:
  <http://savannah.nongnu.org/bugs/?36905>

                 Summary: SNTP problem with SNTP_STARTUP_DELAY symbol
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: freddie_chopin
            Submitted on: Fri 20 Jul 2012 07:04:15 PM GMT
                Category: Contrib
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.0

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Details:

This is about file sntp.c

When I try to define SNTP_STARTUP_DELAY symbol as any function (let that be
rand()) it gives me compiler error:

lwIP/lwIP_Apps/apps/sntp/sntp.c: In function 'sntp_init':
lwIP/lwIP_Apps/apps/sntp/sntp.c:696:5: error: missing binary operator before
token "("

on line:

#if SNTP_STARTUP_DELAY

The solution I've found is to define the symbol as a numeric non-zero value
(for the "#if") and add another symbol SNTP_STARTUP_DELAY_FUNC used in this
line:

sys_timeout((u32_t)SNTP_STARTUP_DELAY_FUNC, sntp_request, NULL);

This way I have two defines:

#ifndef SNTP_STARTUP_DELAY
#define SNTP_STARTUP_DELAY          rand
#define SNTP_STARTUP_DELAY_FUNC         ((rand() % (4 * 60 * 1000)) + (60 * 
1000))
#endif

I don't know whether it's possible to use current code and define original
symbol to be some function - probably not.




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