Re: [lwip-users] SNTP

[Simon Goldschmidt]

"Bernhard \'Gustl\' Bauer" wrote:
> 'timers.c' was not included in LWIP 1.3.2 - is this correct? I plan to 
> add it to my port.
> 
> There is sys_now() needed for this. I don't think it must return system 
> time. A ms counter would be ok, wouldn't it.

Yes.

> A problem would be wrap around. It would happen after 49 days (I 
> remember win95 crashing after this period). Here a code snippet how I 
> would do it:

That's a problem currently, yes. It's planned to be fixed with 1.4.0 as the 
NO_SYS=0 timers will have to be altered, too. I've just added a bug tracker 
entry so that it will not get forgotten again.

> 
> void
> sys_check_timeouts(void)
> {
>    struct sys_timeo *tmptimeout;
>    u32_t diff;
>    sys_timeout_handler h;
>    void *arg;
>    int had_one;
>    u32_t now;
> #if LWIP_DEBUG_TIMERNAMES
>    const char *handler_name;
> #endif /* LWIP_DEBUG_TIMERNAMES */
> 
>    now = sys_now();
>    if (next_timeout) {
>      /* @todo: wrap around? */
> // --------- new code
>      if (now < timeouts_last_time)
>        diff = ( 0xFFFFFFFF - timeouts_last_time ) + now + 1 ;
>      else
> // --------- end of new code
>      diff = now - timeouts_last_time;
> 
> 
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