Re: [lwip-users] tcp_slowtmr and tcp_fasttmr

[Jonathan Larmour]

Julian Gardner [RSD] wrote:
> tcp_slowtmr
> tcp_fasttmr
>
> Which ones do i need to call in my loop, as i have noticed that tcp_tmr 
> calls the slow time but nothing calls the fast timer, do we still need 
> to call the fast timer?

tcp_tmr() calls both!

From core/tcp.c:

void
tcp_tmr(void)
{
  /* Call tcp_fasttmr() every 250 ms */
  tcp_fasttmr();

  if (++tcp_timer & 1) {
    /* Call tcp_tmr() every 500 ms, i.e., every other timer
       tcp_tmr() is called. */
    tcp_slowtmr();
  }
}

> also how do people implement the calls to check for the link being 
> up/down, what kind of rate do you check this?

On some hardware the PHY has an interrupt associated with it.

Jifl
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