Multiple SPI chains from RPi

[volosator]

Guys,

I have multiple boards with SPI connection. Boards are populated with BFY chips.
How do I use more than 2 with RPi? I can not chain them together - there has to a way to reassign GPIO pins to use as CS.


Any ideas?

[richardamullens]

I have multiple boards with SPI connection. Boards are populated with BFY chips.
How do I use more than 2 with RPi? I can not chain them together - there has to a way to reassign GPIO pins to use as CS.

You could implement SPI in software and allocate a different GPIO pin for each chip select.  Doing SPI in software isn't difficult per se.

[Taugeran]

From the sounds of it you have some BLackarrow bitfury boards sitting around and don't have a controller. Or similar product


Pictures or confirmation would help

[Dexter770221]

Three of these:
http://www.digikey.com/product-detail/en/SN74CBTLV3251PWR/296-9129-1-ND/378104
and you good to go. You can split one SPI to eight. Of course you need to add some additional piece of code to driver.

[Taugeran]

Three of these:
http://www.digikey.com/product-detail/en/SN74CBTLV3251PWR/296-9129-1-ND/378104
and you good to go. You can split one SPI to eight. Of course you need to add some additional piece of code to driver.

this would work.

[volosator]

How is this appears in RPi exactly?
Does cgminer require any code change to work with them?

[Taugeran]

How is this appears in RPi exactly?
Does cgminer require any code change to work with them?

Yes it would require code changes

[volosator]

The idea is to use standard mining software with absolutely no modifications.

[Taugeran]

The idea is to use standard mining software with absolutely no modifications.

again ill ask: photograph of boards or identity of boards would be most helpful

[volosator]

Board called DNA1 - there is no pictures available - only schematics. It has 46 chips, 2 banks of 23 each.
Board size is 80x80mm, I can add more banks if only I can run more SPI chains from RPi.

This is homegrown DIY project.