Move M226 to cpp

Marlin/src/gcode/control/M226.cpp

@@ -0,0 +1,58 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../gcode.h"
+#include "../../Marlin.h" // for pin_is_protected and idle()
+#include "../../module/stepper.h"
+
+/**
+ * M226: Wait until the specified pin reaches the state required (M226 P<pin> S<state>)
+ */
+void GcodeSuite::M226() {
+  if (parser.seen('P')) {
+    const int pin_number = parser.value_int(),
+              pin_state = parser.intval('S', -1); // required pin state - default is inverted
+
+    if (WITHIN(pin_state, -1, 1) && pin_number > -1 && !pin_is_protected(pin_number)) {
+
+      int target = LOW;
+
+      stepper.synchronize();
+
+      pinMode(pin_number, INPUT);
+      switch (pin_state) {
+        case 1:
+          target = HIGH;
+          break;
+        case 0:
+          target = LOW;
+          break;
+        case -1:
+          target = !digitalRead(pin_number);
+          break;
+      }
+
+      while (digitalRead(pin_number) != target) idle();
+
+    } // pin_state -1 0 1 && pin_number > -1
+  } // parser.seen('P')
+}