When try to compile RRF 3.4-dev with disabled TMC22xx support: #define SUPPORT_TMC22xx 0, getting a compilation error: ../src/Platform/Platform.cpp:1100:12: error: 'SmartDrivers' has not been declared. Also there is some issues with WiFi support on SAM4S port. With DuetWiFiSocketServer 1.25, the firmware worked, but somehow not stable. When upgraded DuetWiFiSocketServer to 1.27. The moment the web control interface is opened, the board restarts.

Please post at [forum.duet3d.com] to get suggestions for resolving this.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].