AE22 milestone

cores/arduino/wiring_shift.c

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+/*
+  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., 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 ) {
+
+	uint32_t value = 0;
+	uint32_t i;
+	for (i = 0; i < 8 ; i++) {
+		digitalWrite(ulClockPin, HIGH);
+		if (ulBitOrder == LSBFIRST)
+			value |= digitalRead(ulDataPin) << i;
+		else
+			value |= digitalRead(ulDataPin) << (8-i);
+
+		digitalWrite(ulClockPin,LOW);
+	}
+
+	return value;
+
+}
+
+
+void shiftOut( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder, uint32_t ulVal ) {
+
+	int i;
+	for(i = 0; i < 8; i++) {
+		if(ulBitOrder == LSBFIRST)
+			digitalWrite(ulDataPin, !!(ulVal & (1 << i)));
+		else
+			digitalWrite(ulDataPin, !!(ulVal & (1 << (8-i))));
+
+		digitalWrite(ulClockPin, HIGH);
+		digitalWrite(ulClockPin, LOW);
+	}
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+
+