shiftin/shiftout

Author: ladyada

cores/esp32/wiring_shift.c

@@ -0,0 +1,57 @@
+/*
+ wiring_shift.c - shiftOut() function
+ Part of Arduino - http://www.arduino.cc/
+
+ Copyright (c) 2005-2006 David A. Mellis
+
+ Note: file renamed with a core_esp8266_ prefix to simplify linker
+ script rules for moving code into irom0_text section.
+
+ 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
+
+ $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
+ */
+
+#include"wiring_private.h"
+
+uint8_tshiftIn(uint8_tdataPin, uint8_tclockPin, uint8_tbitOrder){
+uint8_tvalue=0;
+uint8_ti;
+
+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);
+ }
+returnvalue;
+}
+
+voidshiftOut(uint8_tdataPin, uint8_tclockPin, uint8_tbitOrder, uint8_tval){
+uint8_ti;
+
+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);
+ }
+}