TMC4361(A) - How can I detect the current state of the HOME reference pin?

You can read out HOME_REF by using the HOME_ERROR_Flag (STATUS register).

To do so, you only have to do the following:

1. Set VMAX=0
2. Set X_HOME unequal to X_ACTUAL
3. Set HOME_EVENT=0110 and HOME_UNCERTAINTY=0

Now, the TMC4361A expects HOME_REF pin to have a low voltage since it's outside X_HOME. Therefore:

• in case HOME_REF=0 → HOME_ERROR_F = 0
• in case HOME_REF=1 → HOME_ERROR_F = 1

Since you know the HOME_REF polarity, you can now switch the home reference registers to the values which fit your application.