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Introduce endstop interrupts

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If ENDSTOP_INTERRUPTS_FEATURE is enabled this tries to set up interrupt routines
for all used endstop pins. If this worked without errors, `endstops.update()` is called
only if one of the endstops changed its state.

The new interrupt routines do not really check the endstops and react upon them. All what they
do, is to set a flag if it makes sense to call the endstop test we are used to.

This can be used on:
* ARM (DUE) based boards - all pins can raise interrupts,
* RAMPS - all 6 endstop pins plus some other on EXT-2 can raise interrupts,
* RAMPS based boards - as long the designers did not change the pins for the endstops or at least left enough,
* all boards, if there are enough pins that can raise interrupts, and you are willing/able to swap with pins dedicated to other purpose.
This commit is contained in:
AnHardt
2016-11-05 22:38:48 +01:00
parent 665b7f3893
commit f3eee02596
26 changed files with 329 additions and 1 deletions
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3
Marlin/example_configurations/tvrrug/Round2/Configuration.h
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@ -435,6 +435,9 @@
#define Z_MAX_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
#define Z_MIN_PROBE_ENDSTOP_INVERTING true // set to true to invert the logic of the endstop.
// If all used endstop pins are able to cause interrupts, you can enable ENDSTOP_INTERRUPTS_FEATURE.
// Then the function testing the endstops will only be called, if the state of one of the endstops changed.
//#define ENDSTOP_INTERRUPTS_FEATURE
//=============================================================================
//============================== Movement Settings ============================