wiring_shift.c File Reference

Bit-banged serial shift functions: shiftIn() and shiftOut(). More...

#include "Arduino.h"

Functions
uint8_t	shiftIn (pin_size_t dataPin, pin_size_t clockPin, BitOrder bitOrder)
	Shift in a byte of data one bit at a time.
void	shiftOut (pin_size_t dataPin, pin_size_t clockPin, BitOrder bitOrder, uint8_t val)
	Shift out a byte of data one bit at a time.

Detailed Description

Bit-banged serial shift functions: shiftIn() and shiftOut().

Function Documentation

shiftIn()

uint8_t shiftIn	(	pin_size_t	dataPin,
		pin_size_t	clockPin,
		BitOrder	bitOrder
	)

Shift in a byte of data one bit at a time.

Each bit is read while the clock is HIGH, then the clock is set back to LOW.

Parameters

dataPin	Pin number to read the data from.
clockPin	Pin number to clock the data on.
bitOrder	LSBFIRST or MSBFIRST.

Returns

The byte read.

shiftOut()

void shiftOut	(	pin_size_t	dataPin,
		pin_size_t	clockPin,
		BitOrder	bitOrder,
		uint8_t	val
	)

Shift out a byte of data one bit at a time.

Each bit is written to the data pin, then the clock is pulsed HIGH then LOW.

Parameters

dataPin	Pin number to write the data to.
clockPin	Pin number to clock the data on.
bitOrder	LSBFIRST or MSBFIRST.
val	Byte to shift out.