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 information.
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.
- mcp23s17gpio
- Microchip MCP23S17 16-bit GPIO chip.
- mcp3kadc
- Microchip MCP3x0x SAR analog to digital converter.
- mcp48x1dac
- Microchip MCP4801/MCP4811/MCP4821 digital to analog converter.
- tm121temp
- Texas Instruments TMP121 temperature sensor.
SEE ALSO
m25p(4), mcp23s17gpio(4), mcp3kadc(4), mcp48x1dac(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.