SPI(4)							   BSD Kernel Interfaces Manual 						    SPI(4)

NAME

     spi -- introduction to machine-independent SPI bus support and drivers

SYNOPSIS

     spi* at mainbus?

     Other attachments are machine-dependent and will depend on the bus topology of your system.  See intro(4) for your system for more informa-
     tion.

DESCRIPTION

     NetBSD includes a machine dependent SPI (Serial Peripheral Interface) bus subsystem, and several different machine-independent SPI device
     drivers.

     Your system may support additional machine-dependent SPI devices.	Consult your system's intro(4) for additional information.

     SPI is a 4-wire synchronous full-duplex serial bus.  Some systems provide support for Microwire, which is Philips' name for a strict subset
     of SPI, with more rigidly defined signaling.  Therefore, Microwire devices are also supported by the SPI framework.

     Note that when referencing SPI devices in a config(1) file, the 'slave' must be provided, as SPI lacks any way to automatically probe
     devices.

HARDWARE

     NetBSD includes the following machine-independent SPI drivers

	   m25p       STMicroelectronics M25P family of NOR flash devices.

	   tm121temp  Texas Instruments TMP121 temperature sensor.

SEE ALSO

     m25p(4), tm121temp(4)

HISTORY

     The machine-independent SPI framework was written by Garrett D'Amore for the Champaign-Urbana Community Wireless Network Project (CUWiN), and
     appeared in NetBSD 4.0.

BSD
								  October 9, 2006							       BSD