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Title: Multiple SPI chains from RPi Post by: volosator on August 25, 2014, 03:27:11 PM 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? Title: Re: Multiple SPI chains from RPi Post by: richardamullens on August 25, 2014, 11:19:02 PM 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. Title: Re: Multiple SPI chains from RPi Post by: Taugeran on August 26, 2014, 01:57:57 AM 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 Title: Re: Multiple SPI chains from RPi Post by: Dexter770221 on August 26, 2014, 10:46:32 AM 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. Title: Re: Multiple SPI chains from RPi Post by: Taugeran on August 26, 2014, 02:14:42 PM Three of these: this would work. 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. Title: Re: Multiple SPI chains from RPi Post by: volosator on August 27, 2014, 05:30:15 PM How is this appears in RPi exactly?
Does cgminer require any code change to work with them? Title: Re: Multiple SPI chains from RPi Post by: Taugeran on August 27, 2014, 05:34:47 PM How is this appears in RPi exactly? Does cgminer require any code change to work with them? Yes it would require code changes Title: Re: Multiple SPI chains from RPi Post by: volosator on August 27, 2014, 07:24:49 PM The idea is to use standard mining software with absolutely no modifications.
Title: Re: Multiple SPI chains from RPi Post by: Taugeran on August 28, 2014, 04:30:33 AM 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 Title: Re: Multiple SPI chains from RPi Post by: volosator on August 28, 2014, 07:51:57 PM 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. |