Recurring errors for arduino code

[tiestoduro]

I am piecing together code to read values from an arduino gyroscope. All of the code is from an arduino example program, (AnalogReadSignal), and the code located on the datasheet for the gyroscope.

What is wrong here?

  /*
  AnalogReadSerial
  Reads an analog input on pin 0, prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
 
 This example code is in the public domain.
 */

#include <Servo.h> 
// Pin used in this example
#define SERVO 9
#define X_GYRO 0
#define Y_GYRO 1
#define ADCresolution 4.89f // = 5000mV/1023counts: Arduino analog pins resolution expressed in mV/count
#define Sensitivity 0.67f // [mV/dps] sensitivity of the sensor, took from datasheet (4x output mode)
// Conversion coefficient, we do here because is a constant! so we'll not do the calculation every loop
#define K ADCresolution/Sensitivity // the constant!
#define nrSamples 6

Servo myservo;

// Timing variables
unsigned long time, sampleTime = 12; 
unsigned long printTime = 0, serialRefresh_time = 500; 
float deltaT = (float)sampleTime*nrSamples/1000;

//Gyroscope variables 
int roll_zeroVoltage, pitch_zeroVoltage; 
int roll_rawADC[nrSamples], pitch_rawADC[nrSamples]; // store 3 values...just to avverage
float roll_rate, pitch_rate; //
float roll_angle = 0, pitch_angle = 0;
int c=0; // just a counter to count the samples
int pos; // variable to store the servo position
int filterGyro(int buffer[]);

// the setup routine runs once when you press reset:
void setup()
{
  // initialize serial communication at 9600 bits per second:
  Serial.begin(115200);
}

// the loop routine runs over and over again forever:
void loop()
{
  // read the input on analog pin 0:
  //int sensorValue = analogRead(A2), analogRead(A3);
  
  {
  // Every 40ms take a sample from gyro
  if(millis() - time > sampleTime) 
  { 
    time = millis(); 
    roll_rawADC[c] = analogRead(Y_GYRO); 
    pitch_rawADC[c] = analogRead(X_GYRO); 
    c++; 
  } 
  
  if(c==nrSamples) // Well, we have 3 samples
  { 
    // Transform the raw data into an angular velocity
    roll_rate = (filterGyro(roll_rawADC) - roll_zeroVoltage) * K; 
    pitch_rate = (filterGyro(pitch_rawADC) - pitch_zeroVoltage)* K;
  
  roll_angle += roll_rate *deltaT/2; 
    pitch_angle += pitch_rate*deltaT/2;
  
  //Keep our angle between 0-359 degrees
    if (roll_angle < 0) 
      roll_angle += 360; 
    else if (roll_angle > 359) 
      roll_angle -= 360; 
    if (pitch_angle < 0) 
      pitch_angle += 360; 
    else if (pitch_angle > 359) 
      pitch_angle -= 360; 
    // Now we control the servo: home position is setted in the center at 90 degrees
      if(roll_angle >= 0 && roll_angle <= 90) // counterclockwise rotation of the gyro...
        pos = 90 + (int)roll_angle; // ...produces rotation from 90 to 180 deg on servo 
      if(roll_angle >= 270) // clockwike rotation of the gyro...
      pos = (int)roll_angle - 270; // ...produces rotation from 90 to 0 deg on servo
      myservo.write(pos); // send the position to servo
    if(millis() - printTime > serialRefresh_time) 
    { 
      printTime = millis(); 
      Serial.print("Roll speed: "); 
      Serial.print((int)roll_rate); 
      Serial.print("\t Angle: "); 
      Serial.print((int)roll_angle); 
      Serial.print("\t Pitch speed: "); 
      Serial.print((int)pitch_rate); 
      Serial.print("\t Angle: "); 
      Serial.println((int)pitch_angle); 
      Serial.print("Servo: "); 
      Serial.println(pos); 
    } 
  // print out the value you read:
  //Serial.println(sensorValue);
  delay(1500);        // delay in between reads for stability
}
int filterGyro(int buffer[]);

{ 
  int mean=0; 
  for(byte i=0; i<nrSamples; i++)
    //mean += buffer(i); 
  mean /= nrSamples; 
  //return mean; 
}
}
}
  

Modified_AnalogReadSerial.cpp.o: In function `loop':
C:\Users\Class2013\Downloads\arduino-1.0.2-windows\arduino-1.0.2/Modified_AnalogReadSerial.ino:62: undefined reference to `filterGyro(int*)'
C:\Users\Class2013\Downloads\arduino-1.0.2-windows\arduino-1.0.2/Modified_AnalogReadSerial.ino:63: undefined reference to `filterGyro(int*)'

[vlad from moscow]

Remove a semicolon after the function declaration in the function definition


int filterGyro(int buffer[]); // <== remove the semicolob

{

[tiestoduro]

Alright thanks,

After making that change I get the following,

Modified_AnalogReadSerial.ino: In function 'void loop()':
Modified_AnalogReadSerial:103: error: a function-definition is not allowed here before '{' token
Clipboard does not contain a string

Again I fail to see what is wrong if this was taken from the arduino website. There is an issue with and Lvalue in the original gyro code. That error disappears when it is combined with the AnalogRead code.

[vlad from moscow]

There is no paired closing brace for an open brace in function loop. The number of open braces { shall be equal to the number of closing braces }

[tiestoduro]

As far as I can tell, I have matched all } to { in void Loop. the corresponding brace is highlighted when the other is clicked.

I'm surprised at this badly written code that was released on data sheets.