National-instruments Touch Panel Computer TPC-2012 Instrukcja Użytkownika Pobierz pdf (Strona 35)

Watchdog Timer Programming

on WinCE (TPC-2012)

Windows CE includes a watchdog timer for the TPC-2012/TPC-2512. You

can access the timer through the WIN32 API. The TPC-2012/TPC-2512

includes a WDT driver, WDT1:, for enabling/disabling the watchdog timer.

You must open this driver before using the resources, and then use the

DeviceIOControl function to enable/disable the watchdog timer.

This appendix describes DeviceIOControl and it parameters. It also

includes a programming example.

DeviceIOControl

DeviceIOControl sends a control code directly to a specified device driver,

causing the corresponding device to perform the specified operation. The

function and its parameters are:

BOOL DeviceIoControl( HANDLE hDevice, DWORD

dwIoControlCode, LPVOID lpInBuffer, DWORD nInBufferSize,

LPVOID lpOutBuffer, DWORD nOutBufferSize, LPDWORD

lpBytesReturned, LPOVERLAPPED lpOverlapped );

Parameters

DeviceIOControl includes the following parameters:

•

hDevice

(in) Handle to the device that performs the operation. Call the

CreateFile function to obtain a device handle.

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National-instruments Touch Panel Computer TPC-2012 Instrukcja Użytkownika Strona 35