Not all hardware has PWM support and there is no compelling reason to
use hardware PWM for fans. Change the default to use software PWM.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Instead of requiring the user enter velocity and accel parameters for
extrude only moves, calculate sane defaults from the printer's maximum
velocity and accel.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Be more clear on which parameters have defaults and which parameters
must be specified in the config.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
A pullup setting on an input pin (ie, '^') should enable the hardware
pullup resistor, but it should not invert the trigger level (ie, it
should remain trigger on high). Those that need to change the trigger
level (ie, trigger on low) must now do that explicitly (ie, '^!').
This makes the code match what other firmwares do.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow a config file to specify 'min_extrude_temp: 0' to disable the
minimum extrude temperature test. This makes it easier to perform
testing on the avr simulator.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Create a new python file (extruder.py) to control the extruder heater
and stepper motors. This separates the extruder control logic from
the cartesian robot code - making it easier to customize both the
kinematic control of the robot as well as the extruder.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Kevin O'Connor