Enabling servo usage on boards with PWM current control
timer5 is used by some boards like the Mini Rambo for controlling motor current via PWM, see stepper.cpp.
```cpp
#ifdef MOTOR_CURRENT_PWM_XY_PIN
pinMode(MOTOR_CURRENT_PWM_XY_PIN, OUTPUT);
pinMode(MOTOR_CURRENT_PWM_Z_PIN, OUTPUT);
pinMode(MOTOR_CURRENT_PWM_E_PIN, OUTPUT);
digipot_current(0, motor_current_setting[0]);
digipot_current(1, motor_current_setting[1]);
digipot_current(2, motor_current_setting[2]);
//Set timer5 to 31khz so the PWM of the motor power is as constant as possible. (removes a buzzing noise)
TCCR5B = (TCCR5B & ~(_BV(CS50) | _BV(CS51) | _BV(CS52))) | _BV(CS50);
#endif
}
```
Using the same timer for controlling servos results in loss of motor control. So use timer4/3 for those boards instead.
[See discussion here.](http://shop.prusa3d.com/forum/software-f13/enabling-auto-leveling-in-firmware-t416-s40.html)
Aim: Test probes in update_endstops only when activated
Changes:
Configurations
Add define for FIX_MOUNTED_PROBE to handle the situation where formerly ENDSTOPS_ONLY_FOR_HOMING had to be set, or lowering the nozzle below Z_PROBE_OFFSET_FROM_EXTRUDER could give an "endstop hit" message.
Add define for Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN to indicate a common situation, that we have a probe but it is connected to an endstop pin
Add some comments
Shift some entries to have related things together.
Conditionals.h
We have a probe (HAS_Z_MIN_PROBE) if one of the pins is defined AND one of the probes is defined.
SanityCheck.h
Add some tests if the probe is connected and if we have defined a probe.
stepper.cpp
Changes to test the probe only when it is deployed (z_probe_is_active).
Test update_endstops() when the probe is deployed.
MarlinMain.cpp
a. set and reset z_probe_is_active in deploy_z_probe(), stow_z_probe() and dock_sled()
b. set and reset z_probe_is_active in the case a z-servo is moved to a defined position. The only remaining unhandled servo move is in M280 where we do not end in a defined position. If you want to handle a probe use M401/402
c. skip deploying/stowing when already deployed/stowed in the dedicated deploy/stow functions.
d. Handle the new FIX_MOUNTED_PROBE in parallel to a servo driven probe/endstop.
To do: In another PR. handle all probes in deploy/stow_z_probe.
Sort out SERVO_LEVELING vs. HAS_SERVO_ENDSTOPS.
If Marlin is blocking the serial input or command queue for any length
of time (for example more than 2 seconds), it needs to send a message
to serial out to inform the host that it is busy. Marlin should only
send these messages out when busy, and preferably not when trying to
print formatted output.
