Help with TMC2208 on Ramps 1.4

Hello All,

Been trying for a couple of days to get my 2208's working in uart mode. What ever I try I cannot seem to change the current or step mode via marlin.

I have the fystec versions, i have soldered the CFG pads on the bottom, have a wire running from the PDN pin to pin 59 on the ramps. All jumpers under the driver removed, made all the changes to marlin.
when i run m122 it still says unabled = false, and there no driver register address for the chips.

Can anyone help me out with this?

Thanks

[imgur.com]
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What changes did you make to Marlin to support UART mode for TMC2208 drivers?

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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].