From 88b38eafd89cede5c02bb6040f6cdb49635cf0aa Mon Sep 17 00:00:00 2001
From: AnHardt <github@kitelab.de>
Date: Tue, 15 Nov 2016 16:41:13 +0100
Subject: [PATCH] Endstop interrupt refinement
At the start of a move, check if the endstops are already triggered.
The 'change' interrupts will not see a change if already triggered.
---
Marlin/stepper.cpp | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Marlin/stepper.cpp b/Marlin/stepper.cpp
index 7e0c744f19..974dbad0e9 100644
--- a/Marlin/stepper.cpp
+++ b/Marlin/stepper.cpp
@@ -359,6 +359,11 @@ void Stepper::isr() {
step_events_completed = 0;
+ #if ENABLED(ENDSTOP_INTERRUPTS_FEATURE)
+ e_hit = 2; // Needed for the case an endstop is already triggered before the new move begins.
+ // No 'change' can be detected.
+ #endif
+
#if ENABLED(Z_LATE_ENABLE)
if (current_block->steps[Z_AXIS] > 0) {
enable_z();