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-.. _lang-shiftout:
-
-shiftOut()
-==========
-
-Description
------------
-
-Shifts out a byte of data one bit at a time. Starts from either the
-most (i.e. the leftmost) or least (rightmost) significant bit. Each
-bit is written in turn to a data pin, after which a clock pin is
-pulsed to indicate that the bit is available.
-
-
-
-This is a software implementation; Arduino (as of 0019) also
-provides an `SPI library <http://arduino.cc/en/Reference/SPI>`_
-that uses the hardware implementation.
-
-
-
-Syntax
-------
-
-shiftOut(dataPin, clockPin, bitOrder, value)
-
-
-
-Parameters
-----------
-
-dataPin: the pin on which to output each bit (*int*)
-
-
-
-clockPin: the pin to toggle once the **dataPin** has been set to
-the correct value (*int*)
-
-
-
-bitOrder: which order to shift out the bits; either **MSBFIRST** or
-**LSBFIRST**.
-(Most Significant Bit First, or, Least Significant Bit First)
-
-
-
-value: the data to shift out. (*byte*)
-
-
-
-Returns
--------
-
-None
-
-
-
-Note
-----
-
-The **dataPin** and **clockPin** must already be configured as
-outputs by a call to
-`pinMode <http://arduino.cc/en/Reference/PinMode>`_\ ().
-
-
-
-**shiftOut** is currently written to output 1 byte (8 bits) so it
-requires a two step operation to output values larger than 255.
-
-::
-
- // Do this for MSBFIRST serial
- int data = 500;
- // shift out highbyte
- shiftOut(dataPin, clock, MSBFIRST, (data >> 8));
- // shift out lowbyte
- shiftOut(data, clock, MSBFIRST, data);
-
- // Or do this for LSBFIRST serial
- data = 500;
- // shift out lowbyte
- shiftOut(dataPin, clock, LSBFIRST, data);
- // shift out highbyte
- shiftOut(dataPin, clock, LSBFIRST, (data >> 8));
-
-
-
-Example
--------
-
-*For accompanying circuit, see the `tutorial on controlling a 74HC595 shift register <http://arduino.cc/en/Tutorial/ShiftOut>`_.*
-
-
-
-::
-
- //**************************************************************//
- // Name : shiftOutCode, Hello World //
- // Author : Carlyn Maw,Tom Igoe //
- // Date : 25 Oct, 2006 //
- // Version : 1.0 //
- // Notes : Code for using a 74HC595 Shift Register //
- // : to count from 0 to 255 //
- //****************************************************************
-
- //Pin connected to ST_CP of 74HC595
- int latchPin = 8;
- //Pin connected to SH_CP of 74HC595
- int clockPin = 12;
- ////Pin connected to DS of 74HC595
- int dataPin = 11;
-
- void setup() {
- //set pins to output because they are addressed in the main loop
- pinMode(latchPin, OUTPUT);
- pinMode(clockPin, OUTPUT);
- pinMode(dataPin, OUTPUT);
- }
-
- void loop() {
- //count up routine
- for (int j = 0; j < 256; j++) {
- //ground latchPin and hold low for as long as you are transmitting
- digitalWrite(latchPin, LOW);
- shiftOut(dataPin, clockPin, LSBFIRST, j);
- //return the latch pin high to signal chip that it
- //no longer needs to listen for information
- digitalWrite(latchPin, HIGH);
- delay(1000);
- }
- }
-
-
-
-
-.. include:: /lang/cc-attribution.txt