1 files changed, 32 insertions, 0 deletions
diff --git a/Marlin/src/libs/crc16.cpp b/Marlin/src/libs/crc16.cpp
new file mode 100644
index 0000000..c219561
--- /dev/null
+++ b/Marlin/src/libs/crc16.cpp
@@ -0,0 +1,32 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "crc16.h"
+
+void crc16(uint16_t *crc, const void * const data, uint16_t cnt) {
+  uint8_t *ptr = (uint8_t *)data;
+  while (cnt--) {
+    *crc = (uint16_t)(*crc ^ (uint16_t)(((uint16_t)*ptr++) << 8));
+    for (uint8_t i = 0; i < 8; i++)
+      *crc = (uint16_t)((*crc & 0x8000) ? ((uint16_t)(*crc << 1) ^ 0x1021) : (*crc << 1));
+  }
+}