Adafruit v1.2 motor shield and AF_Stepper/Accelstepper properly declaring motor

Using Arduino Motors, Mechanics, Power and CNC
1

Greetings.

I need help properly declaring a stepper object, specifically defining new pins, or mapping pins to a port.

I have an Arduino Mega 2560 and an older Adafruit v 1.2 motor shield and am attempting to drive two four wire bipolar stepper motors.

I am using the DFRobot multi expansion shield Mega_Multi-Expansion_shield_SKU_DFR0256-DFRobot so I can simply plug shields into individual headers.

Naive question: These are four wire motors but I am only using two pins to drive the latch? How do I declare the motor:

For my layout I would have expected:

#define STEPPER1_DIR_PIN 51
#define STEPPER1_STEP_PIN 2

#define STEPPER2_DIR_PIN 4
#define STEPPER2_STEP_PIN 3

// note that the DFRrobot expansion board requires me to carefully map digital pins from the Mega to one of four individual header panels.

AccelStepper azimuthMotor(AccelStepper::DRIVER, STEPPER1_STEP_PIN, STEPPER1_DIR_PIN);
AccelStepper elevationMotor(AccelStepper::DRIVER, STEPPER2_STEP_PIN, STEPPER2_DIR_PIN);

Since this is a FULL4WIRE motor am I declaring it correctly?

Motors don't budge and I am trapped in a local minimum?

I would be content using the examples perhaps if I could simply remap pins to ports?

Regards
Todd

2

No answer to my vague question; so here is a more specific one:

With the Ada Fruit v1.2 Motor shield: which pin(s) are direction and which pin(s) are step:

I have this:

Digital pin 11: DC Motor #1 / Stepper #1 (activation/speed control)
Digital pin 3: DC Motor #2 / Stepper #1 (activation/speed control)
Digital pin 5: DC Motor #3 / Stepper #2 (activation/speed control)
Digital pin 6: DC Motor #4 / Stepper #2 (activation/speed control)

However, I would like to understand which pin actually does what so that I can trace the signals back from the latch and see if I am doing what I intend to do.

Todd