I'm going to use TMC2208 stepstick in a printer and the firmware can control via UART the current during printing and during holding (static, no movement): the firmware has an explicit setting for running current and for holding current.
In this case, should I care about the physical trimmer which controls the Vref?
I tried to understand the TMC2208 datasheet (page 50) when it's talking about current control but I don't understand whether the Vref becomes superfluous or it still acts as a maximum value which the UART must obey.