From eacb660e4b1008245361d8db6054ef30ccf031fa Mon Sep 17 00:00:00 2001
From: Scott Lahteine <thinkyhead@users.noreply.github.com>
Date: Tue, 28 Sep 2021 02:39:11 -0500
Subject: [PATCH] =?UTF-8?q?=F0=9F=8E=A8=20Condense=20reverse-protection=20?=
 =?UTF-8?q?code?=
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---
 Marlin/src/feature/stepper_driver_safety.cpp | 156 ++++++-------------
 1 file changed, 51 insertions(+), 105 deletions(-)

diff --git a/Marlin/src/feature/stepper_driver_safety.cpp b/Marlin/src/feature/stepper_driver_safety.cpp
index 991f5a5906..c7da5d2ff7 100644
--- a/Marlin/src/feature/stepper_driver_safety.cpp
+++ b/Marlin/src/feature/stepper_driver_safety.cpp
@@ -39,7 +39,7 @@ void stepper_driver_backward_check() {
 
   OUT_WRITE(SAFE_POWER_PIN, LOW);
 
-  #define TEST_BACKWARD(AXIS, BIT) do { \
+  #define _TEST_BACKWARD(AXIS, BIT) do { \
       SET_INPUT(AXIS##_ENABLE_PIN); \
       OUT_WRITE(AXIS##_STEP_PIN, false); \
       delay(20); \
@@ -49,57 +49,31 @@ void stepper_driver_backward_check() {
       } \
     }while(0)
 
-  #if HAS_X_ENABLE
-    TEST_BACKWARD(X, 0);
-  #endif
-  #if HAS_X2_ENABLE
-    TEST_BACKWARD(X2, 1);
-  #endif
-
-  #if HAS_Y_ENABLE
-    TEST_BACKWARD(Y, 2);
-  #endif
-  #if HAS_Y2_ENABLE
-    TEST_BACKWARD(Y2, 3);
-  #endif
-
-  #if HAS_Z_ENABLE
-    TEST_BACKWARD(Z, 4);
-  #endif
-  #if HAS_Z2_ENABLE
-    TEST_BACKWARD(Z2, 5);
-  #endif
-  #if HAS_Z3_ENABLE
-    TEST_BACKWARD(Z3, 6);
-  #endif
-  #if HAS_Z4_ENABLE
-    TEST_BACKWARD(Z4, 7);
-  #endif
-
-  #if HAS_E0_ENABLE
-    TEST_BACKWARD(E0, 8);
-  #endif
-  #if HAS_E1_ENABLE
-    TEST_BACKWARD(E1, 9);
-  #endif
-  #if HAS_E2_ENABLE
-    TEST_BACKWARD(E2, 10);
-  #endif
-  #if HAS_E3_ENABLE
-    TEST_BACKWARD(E3, 11);
-  #endif
-  #if HAS_E4_ENABLE
-    TEST_BACKWARD(E4, 12);
-  #endif
-  #if HAS_E5_ENABLE
-    TEST_BACKWARD(E5, 13);
-  #endif
-  #if HAS_E6_ENABLE
-    TEST_BACKWARD(E6, 14);
-  #endif
-  #if HAS_E7_ENABLE
-    TEST_BACKWARD(E7, 15);
-  #endif
+  #define TEST_BACKWARD(AXIS, BIT) TERN_(HAS_##AXIS##_ENABLE, _TEST_BACKWARD(AXIS, BIT))
+
+  TEST_BACKWARD(X,   0);
+  TEST_BACKWARD(X2,  1);
+
+  TEST_BACKWARD(Y,   2);
+  TEST_BACKWARD(Y2,  3);
+
+  TEST_BACKWARD(Z,   4);
+  TEST_BACKWARD(Z2,  5);
+  TEST_BACKWARD(Z3,  6);
+  TEST_BACKWARD(Z4,  7);
+
+  TEST_BACKWARD(I,   8);
+  TEST_BACKWARD(J,   9);
+  TEST_BACKWARD(K,  10);
+
+  TEST_BACKWARD(E0, 11);
+  TEST_BACKWARD(E1, 12);
+  TEST_BACKWARD(E2, 13);
+  TEST_BACKWARD(E3, 14);
+  TEST_BACKWARD(E4, 15);
+  TEST_BACKWARD(E5, 16);
+  TEST_BACKWARD(E6, 17);
+  TEST_BACKWARD(E7, 18);
 
   if (!axis_plug_backward)
     WRITE(SAFE_POWER_PIN, HIGH);
@@ -113,59 +87,31 @@ void stepper_driver_backward_report() {
       stepper_driver_backward_error(axis);
   };
 
-  #define REPORT_BACKWARD(axis, bit) _report_if_backward(PSTR(STRINGIFY(axis)), bit)
-
-  #if HAS_X_ENABLE
-    REPORT_BACKWARD(X, 0);
-  #endif
-  #if HAS_X2_ENABLE
-    REPORT_BACKWARD(X2, 1);
-  #endif
-
-  #if HAS_Y_ENABLE
-    REPORT_BACKWARD(Y, 2);
-  #endif
-  #if HAS_Y2_ENABLE
-    REPORT_BACKWARD(Y2, 3);
-  #endif
-
-  #if HAS_Z_ENABLE
-    REPORT_BACKWARD(Z, 4);
-  #endif
-  #if HAS_Z2_ENABLE
-    REPORT_BACKWARD(Z2, 5);
-  #endif
-  #if HAS_Z3_ENABLE
-    REPORT_BACKWARD(Z3, 6);
-  #endif
-  #if HAS_Z4_ENABLE
-    REPORT_BACKWARD(Z4, 7);
-  #endif
-
-  #if HAS_E0_ENABLE
-    REPORT_BACKWARD(E0, 8);
-  #endif
-  #if HAS_E1_ENABLE
-    REPORT_BACKWARD(E1, 9);
-  #endif
-  #if HAS_E2_ENABLE
-    REPORT_BACKWARD(E2, 10);
-  #endif
-  #if HAS_E3_ENABLE
-    REPORT_BACKWARD(E3, 11);
-  #endif
-  #if HAS_E4_ENABLE
-    REPORT_BACKWARD(E4, 12);
-  #endif
-  #if HAS_E5_ENABLE
-    REPORT_BACKWARD(E5, 13);
-  #endif
-  #if HAS_E6_ENABLE
-    REPORT_BACKWARD(E6, 14);
-  #endif
-  #if HAS_E7_ENABLE
-    REPORT_BACKWARD(E7, 15);
-  #endif
+  #define REPORT_BACKWARD(axis, bit) TERN_(HAS_##axis##_ENABLE, _report_if_backward(PSTR(STRINGIFY(axis)), bit))
+
+  REPORT_BACKWARD(X,   0);
+  REPORT_BACKWARD(X2,  1);
+
+  REPORT_BACKWARD(Y,   2);
+  REPORT_BACKWARD(Y2,  3);
+
+  REPORT_BACKWARD(Z,   4);
+  REPORT_BACKWARD(Z2,  5);
+  REPORT_BACKWARD(Z3,  6);
+  REPORT_BACKWARD(Z4,  7);
+
+  REPORT_BACKWARD(I,   8);
+  REPORT_BACKWARD(J,   9);
+  REPORT_BACKWARD(K,  10);
+
+  REPORT_BACKWARD(E0, 11);
+  REPORT_BACKWARD(E1, 12);
+  REPORT_BACKWARD(E2, 13);
+  REPORT_BACKWARD(E3, 14);
+  REPORT_BACKWARD(E4, 15);
+  REPORT_BACKWARD(E5, 16);
+  REPORT_BACKWARD(E6, 17);
+  REPORT_BACKWARD(E7, 18);
 }
 
 #endif // HAS_DRIVER_SAFE_POWER_PROTECT