Help with SD Card module on TM4C123GXL

Hello,

I have a question regarding communication between my Tiva C EK-TM4C123GXL lauchpad and a generic SD Card breakout board.

Using:

• Energia 0101E0013
• Windows 8.1
• SD Library (SD_TM4C)
• 4 GB FujiFilm SD card

I CAN get the ReadWrite demo program in the SD library to work sucessfully by wiring everything up according to the 1-page pinout diagram that came with my board for the SPI bus.

Hardware wiring (SD breakout --> Launchpad):

SDCS  --> J2.9  /  PA3  /  12

MOSI  -->  J2.6  /  PB7  /  15

SCK    -->  J1.7  /  PB4  /  7

MISO  -->  J2.7  /  PB6  /  14

And then I change the ReadWrite code so that it looks like this:

void setup()
{
...
...
...
  pinMode(12, OUTPUT);
  pinMode(12, LOW);

  if (!SD.begin(12)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");
...
...
...
}

...and everything works just fine.

Here's where the problem comes in. I need to change the pins I'm using for the SD card because I'm going to use the Sensor Hub BoosterPack which uses (at least) J2.6 - J2.7 for I2C communication with the sensors. As far as my understanding goes, that means I need to find a different SPI bus for the SD card because I can't switch modes or devices easily.

I have tried wiring up to pins J3.3 - J3.6 and changing my code to this...

void setup()
{
...
...
...
  pinMode(24, OUTPUT);
  pinMode(24, LOW);

  if (!SD.begin(24, SPI_HALF_SPEED, 3)) {

    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");
...
...
...
}

... but the SD card never initializes correctly. I'm obviously missing something and/or not understanding this SP_TM4C library correctly.

Any help would be amazing.

Thank you!