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can GPIO pins be used to communicate with a processor? Answered

I would like to know just curious as I would like to communicate with a ARM CPU (or more powerful processor) by using a GPIO expansion board plugged into a raspberry pi's GPIO.

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G4224T

4 years ago

its possible to use / create a software SPI interface that doesn't rely on the microprocessor actually having a hardware SPI interface. Checkout http://www.libstock.com/projects/view/105/software-version-max7219-seven-segment-wrapped-library for example C code on a PIC micro that actually does this.

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G4224Tnerd7473

Answer 4 years ago

no the site is nothing to do with me but it is a cool way of doing things if the hardware is lacking.

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nerd7473G4224T

Answer 4 years ago

Ok well I lack both hardware and software skills when it comes to CPUs and processors in general

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steveastrouk

4 years ago

Yes, it would be entirely possible to use the SPI bus pins on the Pi to talk to an ARM

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nerd7473steveastrouk

Answer 4 years ago

Do you have any info because I am interested... I would like to know where the SPI pins are. also would like to know how to possibly go about doing this. I am not good with circuits yet so I would need help with that.

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steveastrouknerd7473

Answer 4 years ago

Its a very advanced thing to try if you don't know how to handle circuits. The GPIO connectors are clearly marked here.

http://www.hobbytronics.co.uk/raspberry-pi-gpio-pinout

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nerd7473steveastrouk

Answer 4 years ago

I have a cousin who is very good with computers and I also have the raspberry pi forums. but in the end I will need to design a circuit.

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steveastrouknerd7473

Answer 4 years ago

Get one of the standard I/O boards for the Pi, they'll begin to teach you about SPI.