Tutorial.ShftIn14 History

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February 06, 2007, at 11:43 PM by Carlyn Maw -
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February 06, 2007, at 10:27 PM by Carlyn Maw -
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// Date : 25 Oct, 2006 //
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// Date : 25 Jan, 2007 //
February 06, 2007, at 10:26 PM by Carlyn Maw -
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//**************************************************************//
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[@//**************************************************************//
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February 06, 2007, at 10:25 PM by Carlyn Maw -
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//**************************************************************//
// Name : shiftIn Example 1.4 //
// Author : Carlyn Maw //
// Date : 25 Oct, 2006 //
// Version : 1.0 //
// Notes : Code for using a CD4021B Shift Register //
// : //
//****************************************************************

//define where your pins are
int latchPin = 8;
int dataPin = 9;
int clockPin = 7;

//Define variables to hold the data
//for shift register.
//starting with a non-zero numbers can help
//troubleshoot
byte switchVar1 = 72; //01001000

byte lowcBitNum = 7;
byte dBitNum = 6;
byte eBitNum = 5;
byte fBitNum = 4;
byte gBitNum = 3;
byte aBitNum = 2;
byte bBitNum = 1;
byte highcNum = 0;

boolean dBit;


void setup() {
//start serial
Serial.begin(9600);

//define pin modes
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, INPUT);

}

void loop() {

//Pulse the latch pin:
//set it to 1 to collect parallel data
digitalWrite(latchPin,1);
//set it to 1 to collect parallel data, wait
delayMicroseconds(20);
//set it to 0 to transmit data serially
digitalWrite(latchPin,0);

//while the shift register is in serial mode
//collect each shift register into a byte
//the register attached to the chip comes in first
switchVar1 = shiftIn(dataPin, clockPin);

//Print out the results.
//leading 0's at the top of the byte
//(7, 6, 5, etc) will be dropped before
//the first pin that has a high input
//reading
Serial.println(switchVar1, BIN);

//You can get a bit state through the subfunction
//written below by either...

//setting a boolean variable
dBit = getBit(switchVar1, dBitNum);

if (dBit) {
Serial.println("D");
}

//just validating a function (no new variable required)
if (getBit(switchVar1, aBitNum)) {
Serial.println("A");
}

//white space
Serial.println("-------------------");
//delay so all these print satements can keep up.
delay(500);

}

//------------------------------------------------end main loop

////// ----------------------------------------shiftIn function
///// just needs the location of the data pin and the clock pin
///// it returns a byte with each bit in the byte corresponding
///// to a pin on the shift register. leftBit 7 = Pin 7 / Bit 0= Pin 0
byte shiftIn(int myDataPin, int myClockPin) {

//internal function setup
int i;
int temp = 0;
int pinState;
byte myDataIn = 0;

pinMode(myClockPin, OUTPUT);
pinMode(myDataPin, INPUT);

//we will be holding the clock pin high 8 times (0,..,7) at the
//end of each time through the for loop

//at the begining of each loop when we set the clock low, it will
//be doing the necessary low to high drop to cause the shift
//register's DataPin to change state based on the value
//of the next bit in its serial information flow.
//The register transmits the information about the pins from pin 7 to pin 0
//so that is why our function counts down
for (i=7; i>=0; i--)
{
digitalWrite(myClockPin, 0);
delayMicroseconds(0.2);
temp = digitalRead(myDataPin);
if (temp) {
pinState = 1;
//set the bit to 0 no matter what
myDataIn = myDataIn | (1 << i);
}
else {
//turn it off -- only necessary for debuging
//print statement since myDataIn starts as 0
pinState = 0;
}

//Debuging print statements
//Serial.print(pinState);
//Serial.print(" ");
//Serial.println (dataIn, BIN);

digitalWrite(myClockPin, 1);

}
//debuging print statements whitespace
//Serial.println();
//Serial.println(myDataIn, BIN);
return myDataIn;
}

////// ----------------------------------------getBit
boolean getBit(byte myVarIn, byte whatBit) {
boolean bitState;
bitState = myVarIn & (1 << whatBit);
return bitState;
}


////// A little extra function...
////// ----------------------------------------setBit
byte setBit(byte myVarIn, byte whatBit, boolean s) {
boolean bitState;
if (s) {
myVarIn = myVarIn | (1 << whatBit);
} else {
myVarIn = myVarIn & ~(1 << whatBit);
}
return myVarIn;
}

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