Install busware SCC board on Raspberry Pi

To use busware SCC boards (see busware shop) with FHEM you have to:

  1. Install FHEM (see my earlier blogpost)
  2. If not already root
    $> sudo su -
  3. Remove all reverences of the device ttyAMA0 (/dev/ttyAMA0) from /etc/inittab and /boot/cmdline.txt (if you use a Banana Pi you should look for ttyS2)

    $> nano /etc/inittab

    and replace

    #Spawn a getty on Raspberry Pi serial line
    T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

    with

    #Spawn a getty on Raspberry Pi serial line
    #T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

    and

    $> nano /boot/cmdline.txt

    and remove “console=ttyAMA0,115200” so that the file looks like that:

    dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
  4. On the busware hompage your told, that the boards occupie the following header-pins:
    • UART RXD
    • UART TXD
    • GPIO17
    • GPIO18

    The GPIO-pins 17 and 18 have to be pulled HIGH (17 for unreset, 18 could be untouched too). The best place to do that is in the fhem init-script that runs at startup.
    To do this, you have to open /etc/init.d/fhem  and insert the following lines inti the start-section of the launcher:

    echo "Resetting 868MHz extension module"
    if test ! -d /sys/class/gpio/gpio17; then echo 17 > /sys/class/gpio/export; fi
    if test ! -d /sys/class/gpio/gpio18; then echo 18 > /sys/class/gpio/export; fi
    echo out > /sys/class/gpio/gpio17/direction
    echo out > /sys/class/gpio/gpio18/direction
    echo 0 > /sys/class/gpio/gpio18/value
    echo 0 > /sys/class/gpio/gpio17/value
    sleep 1
    echo 1 > /sys/class/gpio/gpio17/value
    sleep 1
    echo 1 > /sys/class/gpio/gpio18/value

     

  5. Reboot the system:
    $> reboot

Further readings:

 

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