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TPC-1250H User Manual 28

Appendix C Watchdog Timer Program-

ming on WinCE

There is a built-in watchdog timer in Windows CE 4.2 for TPC-1250H.

You can access it through the WIN32 API. TPC-1250H provides a WDT

driver to allow users to enable/disable the watchdog timer. The driver

name is “WDT1:”. Programmers must open this driver before using the

resources. Then programmers can use DeviceIOControl functions to

enable/disable the watchdog timer. The introduction below includes

DeviceIOControl, the definition of the parameter and an example.

C.1 DeviceIOControl

This function sends a control code directly to a specified device driver,

causing the corresponding device to perform the specified operation.

BOOL DeviceIoControl(

HANDLE hDevice,

DWORD dwIoControlCode,

LPVOID lpInBuffer,

DWORD nInBufferSize,

LPVOID lpOutBuffer,

DWORD nOutBufferSize,

LPDWORD lpBytesReturned,

LPOVERLAPPED lpOverlapped );

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