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is PiFace Control and Display 2 compatible with Pi3?

joppep

My basic question is if PiFace 2 is compatible with Pi3?

When I try to access it via the "pifacecad" module I end up with an error that the board is not detected

 

"pifacecad.core.NoPiFaceCADDetectedError: No PiFace Control and Display board detected (hardware_addr=0, bus=0, chip_select=1)."

 

I have double checked that the SPI module is loaded (both /dev/spidev0.1, /dev/spidev0.1)  are available and accessible.

Does anyone have any ide on how to troubleshoot this? Could it be that the my PiFace2 is dead?

Parents
  • 0

      Have you tried editing /usr/lib/python3/dist-packages/pifacecommon/spi.py

     

    Check the frequency if its 125000000 change it to the one below. look like after kernel 4.9.43 it happens and changes it to 125000000 as default which it cant support.  here is some reading on it https://github.com/raspberrypi/linux/issues/2165

     

    # create the spi transfer struct
      transfer = spi_ioc_transfer(
      tx_buf=ctypes.addressof(wbuffer),
      rx_buf=ctypes.addressof(rbuffer),
      len=ctypes.sizeof(wbuffer),
      speed_hz=ctypes.c_uint32(100000)
      )

  • 0 in reply to gam3t3ch

    Thanks! That got me on the right direction to fix this problem.

    Since I have installed the support modules locally I needed to modify

     

    /usr/local/lib/python3.5/dist-packages/pifacecommon/spi.py

     

    (and the corresponding python2 libraries)

     

    to override the default frequency by changing the transfer setting from

     

          # create the spi transfer struct
            transfer = spi_ioc_transfer(
                tx_buf=ctypes.addressof(wbuffer),
                rx_buf=ctypes.addressof(rbuffer),
                len=ctypes.sizeof(wbuffer) 
            )

    to

     

          # create the spi transfer struct
            transfer = spi_ioc_transfer(
                tx_buf=ctypes.addressof(wbuffer),
                rx_buf=ctypes.addressof(rbuffer),
                len=ctypes.sizeof(wbuffer),
                speed_hz=ctypes.c_uint32(100000) 
            )


    Then all my previous packages works perfect with the new kernel 4.9.59-v7+

    Strange that this isn't an FAQ.

     

    Thanks again!

Reply
  • 0 in reply to gam3t3ch

    Thanks! That got me on the right direction to fix this problem.

    Since I have installed the support modules locally I needed to modify

     

    /usr/local/lib/python3.5/dist-packages/pifacecommon/spi.py

     

    (and the corresponding python2 libraries)

     

    to override the default frequency by changing the transfer setting from

     

          # create the spi transfer struct
            transfer = spi_ioc_transfer(
                tx_buf=ctypes.addressof(wbuffer),
                rx_buf=ctypes.addressof(rbuffer),
                len=ctypes.sizeof(wbuffer) 
            )

    to

     

          # create the spi transfer struct
            transfer = spi_ioc_transfer(
                tx_buf=ctypes.addressof(wbuffer),
                rx_buf=ctypes.addressof(rbuffer),
                len=ctypes.sizeof(wbuffer),
                speed_hz=ctypes.c_uint32(100000) 
            )


    Then all my previous packages works perfect with the new kernel 4.9.59-v7+

    Strange that this isn't an FAQ.

     

    Thanks again!

Children
  • 0 in reply to joppep

    just a newbie here,

    ~almost there...editied and saved the spi.py as suggested, however,

    I'm getting a syntax error on the edit addin for : speed_hz=ctypes.c_uint32(100000)

     

    after I run my leds test:

     

    Traceback (most recent call last):

      File "leds.py", line 1, in <module>

        import pifacedigitalio

      File "/usr/local/lib/python3.5/dist-packages/pifacedigitalio/__init__.py", line 18, in <module>

        from pifacecommon.interrupts import (

      File "/usr/local/lib/python3.5/dist-packages/pifacecommon/interrupts.py", line 7, in <module>

        import pifacecommon.mcp23s17

      File "/usr/local/lib/python3.5/dist-packages/pifacecommon/mcp23s17.py", line 7, in <module>

        from .spi import SPIDevice

      File "/usr/local/lib/python3.5/dist-packages/pifacecommon/spi.py", line 69

        speed_hz=ctypes.c_uint32(100000)