iShield and AccelStepper incompatibility

[Ssz7]

Hi,

I am trying to get a stepper motor and flashing light to work with Bluetooth, but I can't get it all to work together properly. I can get just the motor and light to work together, with the motor rotating correctly.

I can also get the flashing light and Bluetooth to work together, BUT when I add the stepper motor to it, it simply vibrates instead of rotating. There appears to be some incompatibility between the stepper motor and the bluetooth library, but I can't seem to figure it out.

I've tried commenting out everything but the stepper code to get to a baseline where the stepper code is working. Then I've tried uncommenting bit by bit, to see what introduces the issue, and it appears to be the call to ble_begin();

HERE'S THE SAMPLE CODE (uncommenting the ble_begin() statement results in the motor vibrating but not turning):

#include "Boards.h"
#include <SPI.h>
#include <RBL_nRF8001.h>
#include "iShield.h"
iShield myiShield;

#include <AccelStepper.h>

AccelStepper stepper(AccelStepper::FULL4WIRE, 8, 9, 10, 11);

void setup()
{
// Initialize and start BLE library.
// ble_begin();
// Serial.begin(9600);
// ble_set_name((char *)"STEPPER W BLUETOOTH");