add shiftIn and shiftOut

cores/k210/wiring_shift.c

@@ -1,25 +1,70 @@
-/**
- * The MIT License (MIT)
- * 
- * Author: Baozhu Zuo (baozhu.zuo@gmail.com)
- * 
- * Copyright (C) 2019  Seeed Technology Co.,Ltd. 
- * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- * 
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
+/*
+  Copyright (c) 2014 Arduino.  All right reserved.
+
+  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "Arduino.h"
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    pin_size_t shiftIn(pin_size_t ulDataPin, pin_size_t ulClockPin, BitOrder ulBitOrder)
+    {
+        uint8_t value = 0;
+        uint8_t i;
+
+        for (i = 0; i < 8; ++i)
+        {
+            digitalWrite(ulClockPin, HIGH);
+
+            if (ulBitOrder == LSBFIRST)
+            {
+                value |= digitalRead(ulDataPin) << i;
+            }
+            else
+            {
+                value |= digitalRead(ulDataPin) << (7 - i);
+            }
+
+            digitalWrite(ulClockPin, LOW);
+        }
+
+        return value;
+    }
+    void shiftOut(pin_size_t ulDataPin, pin_size_t ulClockPin, BitOrder ulBitOrder, uint8_t ulVal)
+    {
+        uint8_t i;
+
+        for (i = 0; i < 8; i++)
+        {
+            if (ulBitOrder == LSBFIRST)
+            {
+                digitalWrite(ulDataPin, !!(ulVal & (1 << i)));
+            }
+            else
+            {
+                digitalWrite(ulDataPin, !!(ulVal & (1 << (7 - i))));
+            }
+
+            digitalWrite(ulClockPin, HIGH);
+            digitalWrite(ulClockPin, LOW);
+        }
+    }
+
+#ifdef __cplusplus
+} // extern "C"
+#endif