Re: [lwip-devel] Upgrading from v1.3.0 to 1.4.0 - sys_now()

[address@hidden]

Phil Perryman wrote:
> I'm currently porting my Xilinx drivers from lwip 1.3.0 to 1.4.0 and have
> found that the latest version now uses a sys_now() function which was not
> used/needed previously.  Why is this now needed
sys_now() is only referenced if NO_SYS==1 and LWIP_TIMERS==1. It is used 
by sys_check_timeouts() for an automatic timer implementation: 
previously, a NO_SYS==1 port had to call the various timer functions at 
the correct interval (e.g. tcp_tmr, etharp_tmr, ip_reass_tmr, etc.).

Now you may simply call sys_check_timeouts() in your main loop: no 
matter at which interval this function is called, it will know when to 
call which timers based on the return value of sys_now().

> and what should the
> frequency of the returned timestamp be (assuming it is just a 32-bit count
> value)?

As the comment above the function declaration says, it should return 
milliseconds:

/** Returns the current time in milliseconds,
 * may be the same as sys_jiffies or at least based on it. */


Simon