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Talking over SPI between the Raspberry-Pi and SRF

Matt Lloyd
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Here is the code for my quick SRF SPI python class.

http://openmicros.org/images/EVE/SRFSPI.zip

This was just a quick class to implement the SRF's SPI protocol and give a couple of TX/RX buffers.

At the bottom of the script is a simple test routine that sends out a--HELLO---- , grabs what ever is already in the SRF's internal buffer then goes into AT command mode and queries the firmware version.

If you would like to give it a go here is how.

First up SPI firmware for the SRF is here on Github, grab the SerialPassThru-V0.68-24MHz-SPI.bin file and flash your XRF/SRF (yes this will work on an XRF), If you have an EVE the SRF will be preloaded with this SPI firmware.

I found the quickest way to get SPI working on Raspbian was using WiringPi great loader tool.

Install WirepinPi then run the following command

$ gpio load spi

This brings up the SPI drivers and give the user access.

 

The SRFSPI class I have done is in python3 and requires the Quick2Wire python libraries

Install the Quick2Wire libray from github

 

That should be all the setup done, to run the SRFSPI.py script type the following

$ python3 SRFSPI.py

 

Let me know how you get on

Matt

 

 

 

 

Comments

  • Ron Arts
    Ron Arts Saturday, 29 December 2012

    Hi,

    I followed your recipe, and I all but succeeded, I received the following output:

    >> a--HELLO----
    [97, 45, 45, 72, 69, 76, 76, 79, 45, 45, 45, 45]
    111
    109
    109
    91
    221
    93
    221
    223
    109
    109
    109
    109
    +++
    [43, 43, 43]
    107
    107
    107
    ATVR
    [65, 84, 86, 82, 13]
    95
    85
    214
    214
    253
    led in a strange way.

    Ron

  • Ron Arts
    Ron Arts Saturday, 29 December 2012

    The output messed up my comment, sorry.
    My last sentence was:

    The returned bytes seem to be mangled in a strange way.

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