mirror of
https://github.com/RobTillaart/Arduino.git
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77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
//
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// FILE: ShiftOutSlow.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// PURPOSE: Arduino library for shiftOut with build-in delay
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// DATE: 2021-05-11
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// URL: https://github.com/RobTillaart/ShiftOutSlow
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// HISTORY
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// 0.1.0 2021-05-11 initial version
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// 0.1.1 2021-08-16 add write(buffer, size) = print interface.
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// improve delay math; update readme.md
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#include "ShiftOutSlow.h"
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ShiftOutSlow::ShiftOutSlow(const uint8_t dataPin, const uint8_t clockPin, const uint8_t bitOrder)
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{
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_clockPin = clockPin;
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_dataPin = dataPin;
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_bitOrder = bitOrder;
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_value = 0;
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pinMode(_dataPin, OUTPUT);
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pinMode(_clockPin, OUTPUT);
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// https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftin/
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digitalWrite(_clockPin, LOW); // assume rising pulses from clock
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}
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size_t ShiftOutSlow::write(const uint8_t data)
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{
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uint8_t val = data;
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uint16_t d1 = _delay/2;
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uint16_t d2 = _delay - d1;
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for (uint8_t i = 0; i < 8; ++i)
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{
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if (d1) delayMicroseconds(d1);
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if (_bitOrder == LSBFIRST) {
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digitalWrite(_dataPin, val & 0x01);
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val >>= 1;
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} else {
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digitalWrite(_dataPin, (val & 0x80) != 0);
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val <<= 1;
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}
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digitalWrite(_clockPin, HIGH);
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if (d2) delayMicroseconds(d2);
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yield();
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digitalWrite(_clockPin, LOW);
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}
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_value = data;
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return 1;
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}
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size_t ShiftOutSlow::write(const uint8_t *buffer, size_t size)
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{
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for (uint8_t i = 0; i < size; ++i)
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{
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write(buffer[i]);
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}
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return size;
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}
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bool ShiftOutSlow::setBitOrder(const uint8_t bitOrder)
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{
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if ((bitOrder == LSBFIRST) || (bitOrder == MSBFIRST))
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{
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_bitOrder = bitOrder;
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return true;
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};
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return false;
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}
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// -- END OF FILE --
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