Code for controlling floppy drive: Error message

Projects Programming
1

Hi everyone,

I recently decided to plunge into the great (not very well-documented) floppy drive interfacing with arduino and I found this code/sketch from a guide on Instructables.
Link: http://www.instructables.com/id/floppy-drawbot/step2/wire-up-the-floppy/

I'm not a hardcore coding-g33k so I'm a little confuzzled when I get this error message in the code.

The code is as follows: (I get the error: 'SetupTimer was not declared in this scope')

#include <stdint.h>
#include <avr/interrupt.h>
#include <util/delay.h>

//pin defs
#define stepDir 3 //which direction to step the read/write head
#define stepPulse 6 //when we pulse this the stepper moves one step
#define motorOn 4 //turn the platter motor on
#define motorPulse 5 //pulsing this sets the speed of the platter
#define motorClock 2 //this is an input from the floppy that pulses once per revolution of the platter
#define LEDPIN 13

//prog defs
#define STEPS 75 //maximum steps the stepper can make
#define MINSPEED 1
#define MAXSPEED 30
#define FORWARD false
#define BACKWARD true

//#define PLATTER_INT

//globals
boolean draw = true;
volatile boolean startPoint = false; //for some experimental interrupt stuff
volatile unsigned int revCount = 0;
void setup()
{
pinMode( motorPulse, OUTPUT );
pinMode( stepDir, OUTPUT );
pinMode( stepPulse, OUTPUT );
pinMode( motorOn, OUTPUT );
pinMode( LEDPIN, INPUT );
pinMode( motorClock, INPUT );

digitalWrite( motorOn, LOW );
Serial.begin(9600);
Serial.println( "floppy drawbot starting" );

// this isn't working because there isn't a clean enough signal from the floppy
#ifdef PLATTER_INT
attachInterrupt( 0, revInt, FALLING );
#endif

//sets up the timer for sending pulses to the platter motor
setupTimer();
}

#ifdef PLATTER_INT
//isr for the platter index count
void revInt()
{
revCount ++;
if( revCount > 8 )
{
revCount = 0;
startPoint = true;
}
}
#endif

void loop()
{
if( Serial.available() )
{
char command = Serial.read();
Serial.println( command );
switch( command )
{
case 'g':
draw = true;
Serial.println( "go" );
digitalWrite( motorOn, false ); //switch platter motor on
break;
case 's':
draw = false;
Serial.println( "stop" );
digitalWrite( motorOn, true ); //switch platter motor off
break;
}
}

//speed to move the pen arm
int speed = map(analogRead(0),0,1024,MINSPEED,MAXSPEED);

if( draw )
{
#ifdef PLATTER_INT
if( startPoint )
{
startPoint = false;
#endif
doSteps(FORWARD, STEPS, speed); //random(MINSPEED,MAXSPEED));
doSteps(BACKWARD, STEPS, speed ); //random(MINSPEED,MAXSPEED));
#ifdef PLATTER_INT
}
#endif
}
}

void doSteps( boolean dir, int steps, int stepDelay )
{
digitalWrite( stepDir, dir );
for( int i = 0; i < steps; i ++ )
{
digitalWrite( stepPulse, LOW );
_delay_ms( stepDelay );
digitalWrite( stepPulse, HIGH );
_delay_ms( stepDelay );
}
}

Can anyone help me out here? What is wrong? What does 'not declared in this scope' mean anyways?
I'm still learning... :drooling_face:

2

What does 'not declared in this scope' mean anyways?

All variables have scope. It is the range of code where the variable is defined. The scope can be block, function, file, or global.

int theAnswerToLifeTheUniverseEtc = 42; // The scope of this variable is global

void someFunc()
{
   int i = 0; // The scope of i is function
   for(int j=0; j<10; j++)
   {
      int k = 14; // The scope of k is block
   }
}

void otherFunc()
{
  // i and j are out of scope here...
}

If you try to use a variable where it is not in scope, you get the message you saw.

The code is as follows: (I get the error: 'SetupTimer was not declared in this scope')

SetupTimer does not appear anywhere in the code you posted, so it is difficult to see how you got that particular message.