TMC2240 use temp for fan control

Macros
1

TMC2240 is special.
TMC2240 only reports temperature if driver is enabled.
Here is an example, based on my setup, where I have glued a thermistor to the X(A) and data from TMC2240:

[display_template drivers_fan]
param_min_temp: 60
param_max_temp: 85
text:
    {% set a_driver_temp = printer["temperature_sensor XA_Driver"].temperature %}
    {% set z_driver_temp = printer["tmc2240 stepper stepper_z"].temperature %}
    {% set delta = param_max_temp - param_min_temp %}
    {% if z_driver_temp is none %}
    # Overwrite empty/missing z temp value
    {% set z_driver_temp = a_driver_temp %}
    {% endif %}
    {((a_driver_temp + z_driver_temp)/2 - param_min_temp) / delta}
    
# Start the electronics bay fan control
[delayed_gcode _START_DRIVERS_FAN]
initial_duration: 1.
gcode:
  SET_FAN_SPEED FAN=drivers TEMPLATE=drivers_fan

[fan_generic drivers]
...

This is simple proportional control.
Where the target minimal activation temp is 60 degrees, and the fan speed will scale based on the temperature overshoot.
25 is a scaling factor.
So, 60 + 25 = 85.
At 85C template would produce 100% PWM for the fan.

Template evaluation errors are printed into the log

Hope that helps someone,
-Timofey

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