On Saturday 15 July 2006 07:23, M. Warner Losh wrote: > SPI == Serial Peripheral Interface. It is common in the embedded > world. The 'bus' is nothing more than 4 signals: chip select, clock, > MOSI (master out, slave in) and MISO (master in, slave out). Lots of
It's not even a bus, only a point to point interface. > cool things live on the spi bus, but I'll just be committing support > for AT45 DataFlash parts. The framework is general enough to support > other things. In one of the hardware hacking lists I'm on, people > were talking about writing a driver for a SPI Ethernet whatsit, but > I'm unsure how that works, since there's no interrupt signal on this > bus... You can poll it (the Microchip ENC28J60 anyway) or assign a GPIO pin as an interrupt line. There is a TCP stack for the various 16 bit micro that can use it. http://www.sics.se/~adam/uip/ Another interesting SPI part is the Maxim MAX3420E - it is a USB slave interface. http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4751 (As you might have guessed I am looking at using these parts, although with a 16 bit AVR, not this fancy ARM stuff :) Another way to use the SPI would be to connect a microcontroller and slave it to the ARM for whatever thing you might need that isn't already built into it.. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
pgpPP1PpI31Co.pgp
Description: PGP signature
