wiring_shift.c

/*
 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
 $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
 */

#include "esp32-hal.h"
#include "wiring_private.h"

uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {  // codespell:ignore shiftin
  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, HIGH);
    digitalWrite(clockPin, LOW);
  }
  return value;
}

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);
  }
}