Compile only selected PIO environment (#11519)

Marlin/src/HAL/shared/math_32bit.h

@@ -0,0 +1,35 @@
+/**
+ * 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/>.
+ *
+ */
+
+#ifndef MATH_32BIT_H
+#define MATH_32BIT_H
+
+#include "../../core/macros.h"
+
+/**
+ * Math helper functions for 32 bit CPUs
+ */
+static FORCE_INLINE uint32_t MultiU32X24toH32(uint32_t longIn1, uint32_t longIn2) {
+  return ((uint64_t)longIn1 * longIn2 + 0x00800000) >> 24;
+}
+
+#endif // MATH_32BIT_H