From 77abda29002216bd8186b430f484c98666a52339 Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Thu, 31 May 2012 18:47:39 -0400 Subject: Replace shiftOut(), also fixing a possible bug. The current shiftOut() is borrowed from Arduino, and is in an LGPL file. Replace that file with a new MIT-licensed version containing a new implementation. The new version brings the clock line LOW before starting, to make sure that the first pulse is detected if the clock line was previously HIGH. Signed-off-by: Marti Bolivar --- wirish/wirish_shift.cpp | 59 +++++++++++++++++++++++-------------------------- 1 file changed, 28 insertions(+), 31 deletions(-) (limited to 'wirish/wirish_shift.cpp') diff --git a/wirish/wirish_shift.cpp b/wirish/wirish_shift.cpp index 0f24f59..a032d50 100644 --- a/wirish/wirish_shift.cpp +++ b/wirish/wirish_shift.cpp @@ -1,40 +1,37 @@ -/* - * wiring_shift.c - shiftOut() function - * Part of Arduino - http://www.arduino.cc/ +/****************************************************************************** + * The MIT License * - * Copyright (c) 2005-2006 David A. Mellis + * Copyright (c) 2012 LeafLabs, LLC. * - * 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. + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, + * modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: * - * 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. + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. * - * 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 $ - */ + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + *****************************************************************************/ #include -void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 val) { - int 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); +void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 value) { + digitalWrite(clockPin, LOW); + for (int i = 0; i < 8; i++) { + int bit = bitOrder == LSBFIRST ? i : (7 - i); + digitalWrite(dataPin, (value >> bit) & 0x1); + togglePin(clockPin); + togglePin(clockPin); } } -- cgit v1.2.3