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digistump-sam/cores/digix/wiring_shift.c

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+/*
+  Copyright (c) 2011 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
+
+uint32_t shiftIn( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t 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( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder, uint32_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