sanguino/cores/arduino/wiring_shift.c

Fri, 17 Nov 2017 10:13:31 +0100

author
mdd
date
Fri, 17 Nov 2017 10:13:31 +0100
changeset 3
770b218a4931
parent 2
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permissions
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proper configuration, homing and planner optimization

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1 /*
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2 wiring_shift.c - shiftOut() function
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3 Part of Arduino - http://www.arduino.cc/
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4
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5 Copyright (c) 2005-2006 David A. Mellis
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6
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7 This library is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU Lesser General Public
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9 License as published by the Free Software Foundation; either
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10 version 2.1 of the License, or (at your option) any later version.
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11
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12 This library is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Lesser General Public License for more details.
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16
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17 You should have received a copy of the GNU Lesser General
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18 Public License along with this library; if not, write to the
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19 Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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20 Boston, MA 02111-1307 USA
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22 $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
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23 */
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24
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25 #include "wiring_private.h"
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26
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27 uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {
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28 uint8_t value = 0;
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29 uint8_t i;
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30
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31 for (i = 0; i < 8; ++i) {
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32 digitalWrite(clockPin, HIGH);
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33 if (bitOrder == LSBFIRST)
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34 value |= digitalRead(dataPin) << i;
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35 else
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36 value |= digitalRead(dataPin) << (7 - i);
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37 digitalWrite(clockPin, LOW);
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38 }
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39 return value;
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40 }
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41
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42 void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
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43 {
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44 uint8_t i;
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45
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46 for (i = 0; i < 8; i++) {
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47 if (bitOrder == LSBFIRST)
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48 digitalWrite(dataPin, !!(val & (1 << i)));
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49 else
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50 digitalWrite(dataPin, !!(val & (1 << (7 - i))));
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51
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52 digitalWrite(clockPin, HIGH);
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53 digitalWrite(clockPin, LOW);
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54 }
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55 }

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