Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Description
The implementation of Sleep is to round the request up to the closest sleep time supported by the OS
and relinquish the processor.
19.6.120 SPISerialBusV2 (SPI Serial Bus Connection Resource
Descriptor (Version 2) Macro)
Syntax
SPISerialBusV2 (DeviceSelection, DeviceSelectionPolarity, WireMode, DataBitLength,
SlaveMode, ConnectionSpeed, ClockPolarity, ClockPhase, ResourceSource, ResourceSourceIndex,
ResourceUsage, DescriptorName, Shared, VendorData)
Arguments
DeviceSelection is the device selection value. This value may refer to a chip-select line, GPIO line or
other line selection mechanism. _ADR is automatically created to refer to this portion of the
resource descriptor.
DeviceSelectionPolarity is an optional argument and can be either PolarityHigh or PolarityLow to
indicate that the device is active. PolarityLow is the default. The bit field _DPL is automatically
created to refer to this portion of the resource descriptor.
WireMode is an optional argument and can be either ThreeWireMode or FourWireMode.
FourWireMode is the default. The bit field name _MOD is automatically created to refer to this
portion of the resource descriptor.
DataBitLength is the size, in bits, of the smallest transfer unit for this connection. _LEN is
automatically created to refer to this portion of the resource descriptor.
SlaveMode is an optional argument and can be either ControllerInitiated or DeviceInitiated.
ControllerInitiated is the default. The bit field name _SLV is automatically created to refer to this
portion of the resource descriptor.
ConnectionSpeed is the maximum connection speed supported by this connection, in hertz. The bit
field name _SPE is automatically created to refer to this portion of the resource descriptor.
ClockPolarity can be either ClockPolarityLow or ClockPolarityHigh. _POL is automatically created
to refer to this portion of the resource descriptor.
ClockPhase can be either ClockPhaseFirst or ClockPhaseSecond. _PHA is automatically created to
refer to this portion of the resource descriptor.
ResourceSource is a string which uniquely identifies the SPI bus controller referred to by this
descriptor. ResourceSource can be a fully-qualified name, a relative name or a name segment that
utilizes the namespace search rules.
ResourceSourceIndex is an optional argument and is assumed to be 0 for this revision.
ResourceUsage is an optional argument and is assumed to be ResourceConsumer for this
revision.DescriptorName is an optional argument that specifies a name for an integer constant that
will be created in the current scope that contains the offset of this resource descriptor within the
current resource template buffer. The predefined descriptor field names may be appended to this
name to access individual fields within the descriptor via the Buffer Field operators.
886 April, 2015 Version 6.0