TMC2208 drivers - Microsteps configured incorrectly I've just installed two TMC2208 drivers on my RAMPS board. I followed a very good step by step tutorial and after some issues, I got it nearly to work.
One problem I still have is that when I tell the printer to lift the Z axis by 5 mm, it lifts it by 10 cm.
I haven't changed anything regarding the steps/mm. Previously I had the Pololus, with 1/16 microstepping and now I also have 1/16 on configuration_adv.h file on Marlin 1.1.8
However what I noticed when doing a M122 is a line which reads:
msteps 256

which sounds like the microstepping was set at 1/256 instead.
Maybe somebody could tell me if I missed something?
UPDATE:
After some more digging into it, here is what I've done so far:

Solder the pins on the driver. Original from Watterrot
Solder the bridge pads for enabling UART communication
Solder the pin for the communication heading upwards
Change the configuration_adv.h on Marlin (1.1.8) and enable all that is to enable: USE_TMC2208, Enable debugging, selecting the Z axis, etc
Check the pins on pins_RAMPS.h and make sure they are available in my setting
Make a Y cable with the 1 kOhm resistor for the TX pin
Hook everything up

No matter what I did, the motor moves twice as much as requested. Although I set up 1/16 microstepping, the same I had with my Pololus, I performed the reverse calculation to find out that the actual microstepping on the driver is 1/8.
After more investigation, the issue seems to be that the driver is not recognized at all by the Marlin/Board. Thinking that it was a problem with the TX/RX communication, I dug into the available info out there and I found this, Bug: TMC2208 UART Communication uses wrong pins for SoftwareSerial #9396.
I proceeded to change the assigned pins for serial RX/TX, but everything is exactly the same.
I tried a different Arduino (original), another RAMPS board and even the 1.1.x and 2.0 bugfix branches from Marlin.
It seems that the driver is on &quot;legacy&quot; mode and software manipulation is not possible. Although I went through the steps to enable it.
I don't have these controllers, but I read that with default settings the TMC2208 will interpolate the microsteps set by the I/O configuration pins to
256 microsteps. Please look into how you set up the dip switches / jumper caps on your board, it seems that only 2 are used (MS1 and MS2). Furthermore, can't you just decrease the count of the array  DEFAULT_AXIS_STEPS_PER_UNIT for the Z entry in your configuration file?