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siemens / meta-iot2050

SIMATIC IOT2050 Isar/Debian Board Support Package
MIT License
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Fix MRAA non-root access #541

Closed bniedermayr closed 4 months ago

bniedermayr commented 7 months ago

This MR fixes some issues related the MRAA API access, as non-root user. The following things have been changed/fixed:

  1. Add gpio chardev support for MRAA (switch from sysfs to chardev)
  2. Add udev rules that adjust permissions and assign required groups to all interfaces
  3. The PWM pins require a more special handling and need to be pre-allocated during boot. This avoids timing problems when exporting those pins the first time via MRAA (see issue #29).
  4. Create an example (non-root) user that has been assigned to all required groups.
  5. Fix MRAA pinmux handling for pin 20