On Mon, 3 May 2010, Kirk Wallace wrote: > Date: Mon, 03 May 2010 13:47:29 -0700 > From: Kirk Wallace <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: Re: [Emc-users] SPI bus communication with mesa cards ? > > On Mon, 2010-05-03 at 12:26 -0700, Peter C. Wallace wrote: > ... snip >> There are 2 SPI hardware interfaces available in HostMot2, the Simple SPI >> (SSPI) and the Buffered SPI. The Simple SPI interface is suited to devices >> that have only one channel. The Buffered SPI (BSPI) interface is suited to >> devices tha have multiple channels per chip and systems that use multiple SPI >> devices that share an interface. Information on the low level SPI hardware is >> in the regmap file. I can help if you have hardware specific questions. > >>> How about a software implementation of the spi protocol. Has anybody >>> worked with that ? How fast could you go with a sw impl. ? > >> I think Kirk Wallace? has a HAL based bit banged SPI interface > > This is what I have so far (really just script-kitty level stuff) > http://www.wallacecompany.com/machine_shop/EMC2/serial_dac/ > http://www.wallacecompany.com/machine_shop/EMC2/serial_adc/ > http://www.wallacecompany.com/machine_shop/EMC2/AEAT-6010/ > > I think Peter mentioned, a while back, that (some) SPI encoders, and > maybe other peripherals, will barf on such slow clock speeds.
SSI, a slightly different animal... Peter Wallace ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
