4b0b4c06d6
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 <mbolivar@leaflabs.com>
38 lines
1.6 KiB
C++
38 lines
1.6 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2012 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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#include <wirish/wirish.h>
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void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 value) {
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digitalWrite(clockPin, LOW);
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for (int i = 0; i < 8; i++) {
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int bit = bitOrder == LSBFIRST ? i : (7 - i);
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digitalWrite(dataPin, (value >> bit) & 0x1);
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togglePin(clockPin);
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togglePin(clockPin);
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}
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}
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