mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-09-20 00:55:58 -04:00
80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
//
|
|
// FILE: ShiftOutSlow.cpp
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 0.1.2
|
|
// PURPOSE: Arduino library for shiftOut with build-in delay
|
|
// DATE: 2021-05-11
|
|
// URL: https://github.com/RobTillaart/ShiftOutSlow
|
|
//
|
|
// HISTORY
|
|
// 0.1.0 2021-05-11 initial version
|
|
// 0.1.1 2021-08-16 add write(buffer, size) = print interface.
|
|
// improve delay math; update readme.md
|
|
// 0.1.2 2021-12-28 update library.json, readme, license, minor edits"
|
|
|
|
|
|
#include "ShiftOutSlow.h"
|
|
|
|
|
|
ShiftOutSlow::ShiftOutSlow(const uint8_t dataPin, const uint8_t clockPin, const uint8_t bitOrder)
|
|
{
|
|
_clockPin = clockPin;
|
|
_dataPin = dataPin;
|
|
_bitOrder = bitOrder;
|
|
_value = 0;
|
|
pinMode(_dataPin, OUTPUT);
|
|
pinMode(_clockPin, OUTPUT);
|
|
// https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftin/
|
|
digitalWrite(_clockPin, LOW); // assume rising pulses from clock
|
|
}
|
|
|
|
|
|
size_t ShiftOutSlow::write(const uint8_t data)
|
|
{
|
|
uint8_t val = data;
|
|
uint16_t d1 = _delay/2;
|
|
uint16_t d2 = _delay - d1;
|
|
for (uint8_t i = 0; i < 8; ++i)
|
|
{
|
|
if (d1) delayMicroseconds(d1);
|
|
if (_bitOrder == LSBFIRST) {
|
|
digitalWrite(_dataPin, val & 0x01);
|
|
val >>= 1;
|
|
} else {
|
|
digitalWrite(_dataPin, (val & 0x80) != 0);
|
|
val <<= 1;
|
|
}
|
|
digitalWrite(_clockPin, HIGH);
|
|
if (d2) delayMicroseconds(d2);
|
|
yield();
|
|
digitalWrite(_clockPin, LOW);
|
|
}
|
|
_value = data;
|
|
return 1;
|
|
}
|
|
|
|
|
|
size_t ShiftOutSlow::write(const uint8_t *buffer, size_t size)
|
|
{
|
|
for (uint8_t i = 0; i < size; ++i)
|
|
{
|
|
write(buffer[i]);
|
|
}
|
|
return size;
|
|
}
|
|
|
|
|
|
bool ShiftOutSlow::setBitOrder(const uint8_t bitOrder)
|
|
{
|
|
if ((bitOrder == LSBFIRST) || (bitOrder == MSBFIRST))
|
|
{
|
|
_bitOrder = bitOrder;
|
|
return true;
|
|
};
|
|
return false;
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|