MM can drive motor and change speed of motor, but direction will not change.

Hey guys I'm using two sparkfun MM's to power 2 50:1 Motors. I just finished connected my motor monsters, and they exhibit the exact same behavior. I'm using the following wiring.

Arduino -------- Monster Moto
2 (Motor 1 H-Bridge ENA) ---------------7 and 8 (INA1 and INB1)
3 (Motor 1 H-Bridge ENB)----------------4 and 9 (INA2 and INB2)
9 (Motor 1 PWM) --------------------------5 and 6 (PWM1 and PWM2)

1) Whenever the Arudino starts the SCM3 execution. The motor starts to rotate CCW.
2) I can adjust the speed using SCM3 Utilities by increasing the PWM Max.

However if I take manual control the motors will not stop or rotate CW.

I have taken the motors out of the equations and just hook up a multimeter, and i'm reading a constant 12V.

I thought it was an issue with my board. so I tried it on the other board, and the exact same behavior is observed, which makes me believe its either a wiring issue or something else.

As a note, I don't have any pots hook up I'm just shooting the A0 the 5V. Not sure if thats causing any issues with the SCM3 code. As I was just trying to manual drive the motors to check out the MM.

Any help or suggestions would greatly be appreciated.

Just wanted to post an update I used some code to test out the motor motors and edited it to turn the motors CCW for 5 seconds and then CW for 5 seconds, and the code works just fine, so it makes me think its something with SCM3 that I might be doing wrong?

Here is example of code.

Code:

 
/*  MonsterMoto Shield Example Sketch
  date: 5/24/11
  code by: Jim Lindblom
  hardware by: Nate Bernstein
  SparkFun Electronics

 License: CC-SA 3.0, feel free to use this code however you'd like.
 Please improve upon it! Let me know how you've made it better.

 This is really simple example code to get you some basic
 functionality with the MonsterMoto Shield. The MonsterMote uses
 two VNH2SP30 high-current full-bridge motor drivers.

 Use the motorGo(uint8_t motor, uint8_t direct, uint8_t pwm)
 function to get motors going in either CW, CCW, BRAKEVCC, or
 BRAKEGND. Use motorOff(int motor) to turn a specific motor off.

 The motor variable in each function should be either a 0 or a 1.
 pwm in the motorGo function should be a value between 0 and 255.
 */
#define BRAKEVCC 0
#define CW   1
#define CCW  2
#define BRAKEGND 3
#define CS_THRESHOLD 100

/*  VNH2SP30 pin definitions
 xxx[0] controls '1' outputs
 xxx[1] controls '2' outputs */
int inApin[1] = {2};  // INA: Clockwise input
int inBpin[1] = {3}; // INB: Counter-clockwise input
int pwmpin[1] = {9}; // PWM input
int cspin[1] = {A0}; // CS: Current sense ANALOG input
unsigned long pwnSize = 1023;
int statpin = 13;

void setup()
{
  Serial.begin(9600);
 
  pinMode(statpin, OUTPUT);

  // Initialize digital pins as outputs
  for (int i=0; i<1; i++)
  {
    pinMode(inApin, OUTPUT);
    pinMode(inBpin, OUTPUT);
    pinMode(pwmpin, OUTPUT);
  }
  // Initialize braked
  for (int i=0; i<1; i++)
  {
    digitalWrite(inApin, LOW);
    digitalWrite(inBpin, LOW);
  }
  // motorGo(0, CW, 1023);
  // motorGo(1, CCW, 1023);
}

void loop()
{
  motorGo(0, CW, pwnSize);
  delay(5000);

  motorGo(0, CCW, pwnSize);
  delay(5000);
 
  if ((analogRead(cspin[0]) < CS_THRESHOLD) && (analogRead(cspin[1]) < CS_THRESHOLD))
    digitalWrite(statpin, HIGH);
}

void motorOff(int motor)
{
  // Initialize braked
  for (int i=0; i<1; i++)
  {
    digitalWrite(inApin, LOW);
    digitalWrite(inBpin, LOW);
  }
  analogWrite(pwmpin[motor], 0);
}

/* motorGo() will set a motor going in a specific direction
 the motor will continue going in that direction, at that speed
 until told to do otherwise.

 motor: this should be either 0 or 1, will selet which of the two
 motors to be controlled

 direct: Should be between 0 and 3, with the following result
 0: Brake to VCC
 1: Clockwise
 2: CounterClockwise
 3: Brake to GND

 pwm: should be a value between ? and 1023, higher the number, the faster
 it'll go
 */
void motorGo(uint8_t motor, uint8_t direct, uint8_t pwm)
{
  if (motor <= 1)
  {
    if (direct <=4)
    {
      // Set inA[motor]
      if (direct <=1)
        digitalWrite(inApin[motor], HIGH);
      else
        digitalWrite(inApin[motor], LOW);

      // Set inB[motor]
      if ((direct==0)||(direct==2))
        digitalWrite(inBpin[motor], HIGH);
      else
        digitalWrite(inBpin[motor], LOW);

      analogWrite(pwmpin[motor], pwm);
    }
  }
}

Yeah I know it's documented, but the documentation doesn't mention if potentiometers are required. However i now know they are, it was probally throwing odd the PID since the pots weren't hooked up, I mounted all the pots to their motors and everything is working like a dream.