mirror of
https://github.com/RobTillaart/Arduino.git
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87 lines
1.4 KiB
C++
87 lines
1.4 KiB
C++
//
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// FILE: nibbleArray.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.5
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// PURPOSE: Arduino library for a compact array of nibbles (4 bits)
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// URL: https://github.com/RobTillaart/nibbleArray
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#include "nibbleArray.h"
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nibbleArray::nibbleArray(const uint16_t size)
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{
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_size = size;
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if (_size > (uint16_t) NIBBLEARRAY_MAXSIZE)
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{
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_size = (uint16_t) NIBBLEARRAY_MAXSIZE;
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}
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_bytes = (_size + 1)/2;
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_arr = (uint8_t *) malloc(_bytes);
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}
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nibbleArray::~nibbleArray()
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{
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if (_arr != NULL)
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{
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free(_arr);
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}
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}
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uint8_t nibbleArray::get(const uint16_t index)
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{
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// disable this check for more speed
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if (index > _size)
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{
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return NIBBLEARRAY_ERROR_INDEX;
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}
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if (index & 1) return _arr[index/2] & 0x0F;
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return _arr[index/2] >> 4;
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}
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uint8_t nibbleArray::set(const uint16_t index, uint8_t value)
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{
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// disable this check for more speed
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if (index > _size)
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{
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return NIBBLEARRAY_ERROR_INDEX;
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}
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uint8_t v = value & 0x0F;
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if (index & 1) _arr[index/2] = (_arr[index/2] & 0xF0) | v;
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else _arr[index/2] = (_arr[index/2] & 0x0F) | (v << 4);
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return NIBBLEARRAY_OK;
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}
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uint16_t nibbleArray::size()
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{
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return _size;
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};
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uint16_t nibbleArray::memory()
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{
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return _bytes;
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};
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void nibbleArray::clear()
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{
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memset(_arr, 0, (_size + 1)/2);
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}
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void nibbleArray::setAll(uint8_t value)
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{
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uint8_t v = value & 0x0F;
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v |= (v << 4);
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memset(_arr, v, (_size + 1)/2);
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}
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// -- END OF FILE --
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