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Programming Watchdog Timer

Embedded and Industrial Computing

Appendix A

#include <sys/errno.h>

#include <machine/bus.h>

#include <machine/resource.h>

#endif

/* local include file */

#include “../include/ioaccess.h”

#if (defined(MODULE) || defined(DIRECT_IO_ACCESS) ||

defined(KLD_MODULE))

* Platform Depend GPIOs Interface for Watchdog and Lan

bypass

*---------------------------------------------------------------------------

---

* LEB-7105 Version V1.0

* LEB-7105 embedded with HW Watchdog timer functions.

* Set Lan bypass Enable/Disable while System-off:

* ======================================

=========

* It is able to set Lan bypass enable/disable in system off

mode by SW program.

* The IO interface for off-mode bypass is connected to

Winbond SIO 83627UHG

* GPO22,GPO23(Pair1), GPO30,GPO31(Pair2),

* Refer to Winbond 83527 datasheet for details.

* The truth table of function is defined as below:

* Pair Bypass function GPIO Pin

* ---------------------------------------------------

* 1 Enable G P O 2 2 = 1

GPO23=0

* 1 Disable G P O 2 2 = 0

GPO23=1

* 2 Enable G P O 3 0 = 1

GPO31=0

* 2 Disable G P O 3 0 = 0

GPO31=1

* Runtime:

* ========

* It is able to set Lan bypass enable/disable alone, or design

hybrid with

* watchdog timeout(WDTO#).

* The IO interface for this function is conjunction with

Winbond 83627

* GPO24 (Pair1), GPO60(Pair2) and WDTO#.

* Refer to Winbond 83627 datasheet for details.

* The truth table is defined as below:

* Below setting is to determine system behavior while

watchdog timer expired.

* GPO27 System behavior

* ------------------------------------------------

* 0 Lan-bypass while watchdog timeout

* 1 System Reset while watchdog timeout

* Below setting is to determine lan bypass in runtime mode

* Pair Bypass function GPIO Pin

* -----------------------------------------------------------

* 1 Enable GPO24 =1

* 1 Disable GPO24 =0

* 2 Enable GPO60 =1

* 2 Disable GPO60 =0

* Note: To sete runtime bypass mode, user need to set

off-mode bypass

* enabled in order to let function activity.

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