mirror of
https://github.com/PaulStoffregen/Tlc5940
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82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/* Copyright (c) 2009 by Alex Leone <acleone ~AT~ gmail.com>
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This file is part of the Arduino TLC5940 Library.
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The Arduino TLC5940 Library is free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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The Arduino TLC5940 Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with The Arduino TLC5940 Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef TLC_SHIFTS_H
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#define TLC_SHIFTS_H
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/** \file
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TLC channel shifting functions. */
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#include "Tlc5940.h"
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uint16_t tlc_shiftUp(uint16_t zeroValue = 0);
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uint16_t tlc_shiftDown(uint16_t topValue = 0);
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/** \addtogroup ExtendedFunctions
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\code #include "tlc_shifts.h" \endcode
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- uint16_t tlc_shiftUp(uint16_t zeroValue = 0) - shifts all channel data
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up (OUT0 becomes OUT1 ...) and returns OUT15
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- uint16_t tlc_shiftDown(uint16_t topValue = 0) - shifts all channel data
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down (OUT15 becomes OUT14 ...) and returns OUT0 */
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/* @{ */
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/** Shifts all the channel data up (OUT0 becomes OUT1 ...). Needs a
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Tlc.update() after.
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\param zeroValue the value of channel 0.
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\returns the value that was shifted off the end (OUT15) */
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uint16_t tlc_shiftUp(uint16_t zeroValue)
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{
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uint16_t topValue = ((uint16_t)(*tlc_GSData) << 4)
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| (*(tlc_GSData + 1) >> 4);
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uint8_t *p = tlc_GSData + 1;
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while (p < tlc_GSData + NUM_TLCS * 24 - 1) {
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*(p - 1) = (*p << 4) | (*(p + 1) >> 4);
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*p = (*(p + 1) << 4) | (*(p + 2) >> 4);
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p += 2;
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}
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*(tlc_GSData + NUM_TLCS * 24 - 2) = (*(tlc_GSData + NUM_TLCS * 24 - 1) << 4)
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| ((zeroValue & 0x0F00) >> 8);
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*(tlc_GSData + NUM_TLCS * 24 - 1) = (uint8_t)zeroValue;
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return topValue;
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}
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/** Shifts all the channel data down (OUT 15 -> OUT 14 ...). Needs a
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Tlc.update() after.
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\param topValue the value of Tlc (n) channel 15.
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\returns the value that was shifted off the bottom (OUT0) */
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uint16_t tlc_shiftDown(uint16_t topValue)
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{
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uint8_t *p = tlc_GSData + NUM_TLCS * 24 - 2;
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uint16_t zeroValue =
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((uint16_t)(*(tlc_GSData + NUM_TLCS * 24 - 2) & 0x0F) << 8)
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| *(tlc_GSData + NUM_TLCS * 24 - 1);
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while (p > tlc_GSData) {
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*(p + 1) = (*p >> 4) | (*(p - 1) << 4);
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*p = (*(p - 1) >> 4) | (*(p - 2) << 4);
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p -= 2;
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}
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*(tlc_GSData + 1) = (*tlc_GSData >> 4) | ((uint8_t)topValue << 4);
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*tlc_GSData = topValue >> 4;
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return zeroValue;
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}
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/* @} */
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#endif
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