Psion Teklogix ISO 9001 Manual de usuario descargar pdf (Pagina 32)

Chapter 3: Software Information

NEO Expansion Port Power Control

24 Psion Teklogix NEO HDK User Manual

The method of power control is set through the following registry key:

Registry Key: [HKEY_LOCAL_MACHINE\Services\TekDTSvc\ExpansionPort\1\]

Registry Value: “Power”=dword

Managing Power Through DTS

To have DTS manage the power, set the Power registry value to one of the non-zero

TekDTSioctl_PortPowerState enumeration values:

DTS will read the registry value and update the expansion power state on computer reboot

or resume.

Managing Power Through API Functions

To manage the power directly, set the Power registry value to DtsPortPowerState_Off (0),

then use the following HDK API function calls:

ExpansionPortResult GetConnectState(bool &connected)

Determines if a peripheral is attached to the expansion port. The value of the connected

boolean parameter reflects the presence or absence of a connected peripheral.

ExpansionPortResult SetPowerState(PortPowerState powerState)

Sets the power state of the expansion port. The powerState variable that is passed must be

one of the values in the PortPowerState enumeration, as defined in the table below.

ExpansionPortResult GetPowerState(PortPowerState &powerState)

Determines the current power state of the expansion port. The powerState parameter will

reflect the current state of the expansion port power, as defined in the PortPowerState

enumeration table.

Table 3.1 TekDTSioctl_PortPowerState Enumerations

Value Enumeration Name Description

0 DtsPortPowerState_Off Power disabled (Default).

1 DtsPortPowerState_On Always powered.

4 DtsPortPowerState_AutoOnOff Powered on when hand-held is

running, powered off during suspend.

Note: Power states 2 and 3 are not supported by DTS in conjunction with this port.

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Psion Teklogix ISO 9001 Manual de usuario Pagina 32