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Multiple SPI chains from RPi
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Topic: Multiple SPI chains from RPi (Read 1394 times)
volosator
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Multiple SPI chains from RPi
August 25, 2014, 03:27:11 PM
#1
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
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Re: Multiple SPI chains from RPi
August 25, 2014, 11:19:02 PM
#2
Quote from: volosator on August 25, 2014, 03:27:11 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.
Taugeran
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Re: Multiple SPI chains from RPi
August 26, 2014, 01:57:57 AM
#3
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
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Dexter770221
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Re: Multiple SPI chains from RPi
August 26, 2014, 10:46:32 AM
#4
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.
Under development Modular UPGRADEABLE Miner (MUM). Looking for investors.
Changing one PCB with screwdriver and you have brand new miner in hand... Plug&Play, scalable from one module to thousands.
Taugeran
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Re: Multiple SPI chains from RPi
August 26, 2014, 02:14:42 PM
#5
Quote from: 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.
this would work.
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volosator
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Re: Multiple SPI chains from RPi
August 27, 2014, 05:30:15 PM
#6
How is this appears in RPi exactly?
Does cgminer require any code change to work with them?
Taugeran
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Re: Multiple SPI chains from RPi
August 27, 2014, 05:34:47 PM
#7
Quote from: 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?
Yes it would require code changes
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volosator
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Re: Multiple SPI chains from RPi
August 27, 2014, 07:24:49 PM
#8
The idea is to use standard mining software with absolutely no modifications.
Taugeran
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Re: Multiple SPI chains from RPi
August 28, 2014, 04:30:33 AM
#9
Quote from: volosator on August 27, 2014, 07:24:49 PM
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
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volosator
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Re: Multiple SPI chains from RPi
August 28, 2014, 07:51:57 PM
#10
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.
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