diff --git a/cores/rp2040/wiring_shift.cpp b/cores/rp2040/wiring_shift.cpp
new file mode 100644
index 0000000..6356ee1
--- /dev/null
+++ b/cores/rp2040/wiring_shift.cpp
@@ -0,0 +1,49 @@
+/*
+ * wiring_shift.c - shiftOut() function
+ * Part of Arduino - http://www.arduino.cc/
+ * 
+ * Copyright (c) 2005-2006 David A. Mellis
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA  02111-1307  USA
+*/
+
+#include <Arduino.h>
+
+extern "C" uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {
+    uint8_t value = 0;
+    uint8_t i;
+    for (i = 0; i < 8; ++i) {
+       digitalWrite(clockPin, HIGH);
+       if (bitOrder == LSBFIRST)
+          value |= digitalRead(dataPin) << i;
+       else
+          value |= digitalRead(dataPin) << (7 - i);
+          digitalWrite(clockPin, LOW);
+    }
+    return value;
+}
+
+extern "C" void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val) {
+    uint8_t i;
+    for (i = 0; i < 8; i++)  {
+       	if (bitOrder == LSBFIRST)
+            digitalWrite(dataPin, !!(val & (1 << i)));
+        else	
+            digitalWrite(dataPin, !!(val & (1 << (7 - i))));
+			
+        digitalWrite(clockPin, HIGH);
+        digitalWrite(clockPin, LOW);		
+    }
+}