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docs: Add a "hardware pin type" section to the FAQ 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2020-07-16 12:53:49 -04:00
parent 180f44b876
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1 changed files with 40 additions and 4 deletions
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docs/FAQ.md
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@ -19,10 +19,11 @@ Frequently asked questions
16. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
17. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
18. [How do I convert a Marlin pin number to a Klipper pin name?](#how-do-i-convert-a-marlin-pin-number-to-a-klipper-pin-name)
19. [How do I cancel an M109/M190 "wait for temperature" request?](#how-do-i-cancel-an-m109m190-wait-for-temperature-request)
20. [Can I find out whether the printer has lost steps?](#can-i-find-out-whether-the-printer-has-lost-steps)
21. [Why does Klipper report errors? I lost my print!](#why-does-klipper-report-errors-i-lost-my-print)
22. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
19. [Do I have to wire my device to a specific type of micro-controller pin?](#do-i-have-to-wire-my-device-to-a-specific-type-of-micro-controller-pin)
20. [How do I cancel an M109/M190 "wait for temperature" request?](#how-do-i-cancel-an-m109m190-wait-for-temperature-request)
21. [Can I find out whether the printer has lost steps?](#can-i-find-out-whether-the-printer-has-lost-steps)
22. [Why does Klipper report errors? I lost my print!](#why-does-klipper-report-errors-i-lost-my-print)
23. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
### How can I donate to the project?
@ -386,6 +387,41 @@ support these custom pin numbers - check Marlin's fastio headers (see
above) to translate these pin numbers to their standard hardware
names.
### Do I have to wire my device to a specific type of micro-controller pin?
It depends on the type of device and type of pin:
ADC pins (or Analog pins): For thermistors and similar "analog"
sensors, the device must be wired to an "analog" or "ADC" capable pin
on the micro-controller. If you configure Klipper to use a pin that is
not analog capable, Klipper will report a "Not a valid ADC pin" error.
PWM pins (or Timer pins): Klipper does not use hardware PWM by default
for any device. So, in general, one may wire heaters, fans, and
similar devices to any general purpose IO pin. However, fans and
output_pin devices may be optionally configured to use `hardware_pwm:
True`, in which case the micro-controller must support hardware PWM on
the pin (otherwise, Klipper will report a "Not a valid PWM pin"
error). Note that hardware PWM is currently only supported on the avr,
atsam, samd21, and linux micro-controllers.
IRQ pins (or Interrupt pins): Klipper does not use hardware interrupts
on IO pins, so it is never necessary to wire a device to one of these
micro-controller pins.
SPI pins: When using hardware SPI it is necessary to wire the pins to
the micro-controller's SPI capable pins. However, most devices can be
configured to use "software SPI", in which case any general purpose IO
pins may be used.
I2C pins: When using I2C it is necessary to wire the pins to the
micro-controller's I2C capable pins.
Other devices may be wired to any general purpose IO pin. For example,
steppers, heaters, fans, Z probes, servos, LEDs, common hd44780/st7920
LCD displays, the Trinamic UART control line may be wired to any
general purpose IO pin.
### How do I cancel an M109/M190 "wait for temperature" request?
Navigate to the OctoPrint terminal tab and issue an M112 command in