[okl4-developer] About jiffies in wombat

[Nelson Tam]

Hi Kashin,

On 09/01/2008, at 4:29 AM, kashin Lin wrote:

> when i build okl4 with "driver" example, i got following warnings  
> and abort building process.

The function "iguana_getenv()" is defined in libs/iguana/src/env.c.   
The header
declaration is in libs/iguana/include/env.h.  Please check that the  
header file
is included in drivers_example.c.

> i have some addition question about timer driver:
> what does"handling timeouts correctly" mean?
> does it mean i should check if timer's period setting effectively?
> or there are some actions i should do when timeout occurs? (ex: ?)

Two things:

1. like you said, setting a periodic timer such that you get periodic  
timeouts
2. calling current_time() and looking at the results

> what should i implement in "device_interrupt_impl" ?
> what does the return value indicate?


Typically a few things:

  - acknowledge the interrupt on the device, such as clearing  
interrupt bits, if
needed
  - do whatever is appropriate depending on the reason for the  
interrupt, such as
handling timer overflows etc.
  - the return value is given back to the device server.  The device  
server is free
to do whatever it wants with the return value

Enjoy,
Nelson.
--
(nt)