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Author Topic: SD Shield Issues for Arduino Mega (works with Arduino Uno)  (Read 2045 times)
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I am having trouble having my Arduino Mega 2560 read text files from the SD Shield. My SD Shield is functional on an Arduino Uno R3 Plus, however. I also installed the driver for the Mega and have tested it with non-SD card related programs and it works fine. Does the SD shield plug into the Mega differently? Am I using the wrong ports?

I chose to buy an Arduino Mega 2560 in order to use more ports simultaneously. I desire to have my Arduino play music by reading text files located on an SD card. The Uno only allowed me to play up to two files at once as only 2 ports could be used at once. So, that's why I bought the Mega 2560.

This is my code, BTW. It works on the Uno, but not the Mega.
Code:
#include <Metro.h>
#include <SD.h>
#include <String.h>
#include <Tone.h>

File root;//Used as the directory

const int arr[7][27] = {
  {
    26, 28, 29, 52, 55, 58, 104, 110, 117, 208, 220, 233, 415, 440, 466, 831, 880, 932,  1661, 1760, 1865, 3322, 3520, 3729, 0,    0,    0    }
  ,
  {
    29, 31, 33, 58, 62, 65, 117, 123, 131, 233, 247, 262, 466, 494, 523, 932, 988, 1047, 1865, 1976, 2093, 3729, 3951, 4186, 0,    0,    0    }
  ,
  {
    0,  16, 17, 31, 33, 35, 62,  65,  69,  123, 131, 139, 247, 262, 277, 494, 523, 554,  988,  1047, 1109, 1976, 2093, 2217, 3951, 4186, 4435    }
  ,
  {
    17, 18, 19, 35, 37, 39, 69,  73,  78,  139, 147, 156, 277, 294, 311, 554, 587, 622,  1109, 1175, 1245, 2217, 2349, 2489, 4435, 4699, 4978    }
  ,
  {
    19, 21, 22, 39, 41, 44, 78,  82,  87,  156, 165, 175, 311, 330, 349, 622, 659, 698,  1245, 1319, 1397, 2489, 2637, 2794, 4978, 0,    0    }
  ,
  {
    21, 22, 23, 41, 44, 46, 82,  87,  93,  165, 175, 185, 330, 349, 370, 659, 698, 740,  1319, 1397, 1480, 2637, 2794, 2960, 0,    0,    0    }
  ,
  {
    23, 25, 26, 46, 49, 52, 93,  98,  104, 185, 196, 208, 370, 392, 415, 740, 784, 831,  1480, 1568, 1661, 2960, 3136, 3322, 0,    0,    0    }
};
//Rows are as follows: A B C D E F G
//Columns are 0F, 0N, 0S, 1F, 1N, 1S, etc.
void readFile(File f, int t, int numba);
int getTempo(File f, int i);
int translation(String s);

int tempo1 = 0, tempo2 = 0, tempo3 = 0, tempo4 = 0, tempo5 = 0;
double duration = 0;
int pitch = 0;
int pitch2 = 0;
int duration2 = 0;
Tone tone1;
Tone tone2;

Metro m1 = Metro(0);
Metro m2 = Metro(0);

void setup()

  Serial.begin(9600);//Begins the serial at a rate of 9600 bauds.
  pinMode(10, OUTPUT);//Sets port 10 as the output port.
  SD.begin(10);//Used for SD cards and the like.
  tone1.begin(8);//Needed to start the tone variable.
  tone2.begin(9);
  root = SD.open("/ALttP/"); // Just use "/" if you don't want to go to a specific folder....
  File temp = root.openNextFile();//Starts it on the 1st file.
  File temp2 = root.openNextFile();
  //int i = 0;//Used for
  if(temp)
  Serial.println("File 1 works");
  else
  Serial.println("File 1 doesn't work");
  if(temp2)
  Serial.println("File 2 works");
  else
  Serial.println("File 2 doesn't work");
  if(temp && temp2)
  {
  int seekPos = 0, seekPos2 = 0;
  seekPos = getTempo(temp, 0);
  seekPos2 = getTempo(temp2, 1);
//  countFile(temp, i);
  temp.seek(seekPos);
  temp2.seek(seekPos2);
  while(temp.available() || temp2.available())
  {
    if(m1.check() && temp.available())
    {
    readFile(temp, tempo1, 0);
    tone1.play(pitch, duration);
    m1.interval(duration);
    m1.reset();
    }
    if(m2.check() && temp2.available())
    {
    readFile(temp2, tempo2, 1);
    tone2.play(pitch2, duration2);
    m2.interval(duration2);
    m2.reset();
    }
  } 
  }
  Serial.println("Completed");
}
void loop()
{
//  Serial.println("Yay!");
}

/*void countFile(File f, int i)
{
  int count = 0;
  while(f.available())
  {
    char c = f.read();
    if(c == ((char) 32))
    {
      count++;
    }
  }
  count++;
  if(i == 0)
  {
    limit1 = count/2;
  }
  else if(i == 1)
  {
    limit2 = count/2;   
  }
  else if(i == 2)
  {
    limit3 = count/2;   
  }
  else if(i == 3)
  {
    limit4 = count/2;   
  }
  else if(i == 4)
  {
    limit5 = count/2;   
  }
}*/

void readFile(File f, int t, int numba)
{
  int k = 0, iteration = 0;
//  int song[500], duration[500];
  String s = "";
  while(f.available() && iteration < 2)
  {
    String s = "";
    boolean b = true;
    while(b && f.available())
    {
      char c = f.read();
      if((c >  '/' && c < ':') || (c > '@' && c < 'H') || (c > '`' && c < 'h') || c == 'r' || c == '.' && c != '\n')
      {
        s+= c;
      }
      else if(c == ' ')
      {
       b = false;
       Serial.println(s);
      }
    }
    if(s != NULL && s.length() >= 1)
    {
        if(iteration%2 == 0)
          {
            if(numba == 0)
            pitch = translation(s);         
            else if(numba == 1)
            pitch2 = translation(s);
          }
        else
        {
          char buf[s.length()+1];
          s.toCharArray(buf,sizeof(buf));
          double WVal=atof(buf);
          double v = (((WVal)/4.0) * (245000.0/(t)));       
          Serial.println(v);
          if(numba == 0)
          duration = v;     
          else if(numba == 1)
          duration2 = v;
          k++;
        }
        iteration++;
    }
  } 
}
int translation(String s)
{
  int row = 0, column = 0, modifier = 0;
  char a = s.charAt(0), b = s.charAt(1);
  if('a' == tolower(a))
    row = 0;
  else if('b' == tolower(a))
    row = 1;
  else if('c' == tolower(a))
    row = 2;
  else if('d' == tolower(a))
    row = 3;
  else if('e' == tolower(a))
    row = 4;
  else if('f' == tolower(a))
    row = 5;
  else if('g' == tolower(a))
    row = 6;
  else
    return 0;
  if(s.length() == 2)
  {
    modifier = 1;
    if('0' ==  b)
      column = 0;
    else if('1' ==  b)
      column = 1;
    else if('2' ==  b)
      column = 2;
    else if('3' ==  b)
      column = 3;
    else if('4' ==  b)
      column = 4;
    else if('5' ==  b)
      column = 5;
    else if('6' ==  b)
      column = 6;
    else if('7' ==  b)
      column = 7;
    else if('8' ==  b)
      column = 8;
    else
      return 0;
  }
  else if(s.length() == 3)
  {
    char c = s.charAt(2);
    if('f' == tolower(b))
      modifier = 0;
    else if('n' == tolower(b))
      modifier = 1;
    else if('s' == tolower(b))
      modifier = 2;
    else
      return 0;
    if('0' ==  c)
      column = 0;
    else if('1' ==  c)
      column = 1;
    else if('2' ==  c)
      column = 2;
    else if('3' ==  c)
      column = 3;
    else if('4' ==  c)
      column = 4;
    else if('5' ==  c)
      column = 5;
    else if('6' ==  c)
      column = 6;
    else if('7' ==  c)
      column = 7;
    else if('8' ==  c)
      column = 8;
    else
      return 0;
  }
  else
    return 0;
  if(row > 6 || row < 0 || ((3*column) + modifier) > 26 || ((3*column) + modifier) < 0)
    return 0;
  return arr[row][(3*column) + modifier];
}
int getTempo(File f, int i)
{
  String s = "";
  char c;
  boolean b = true;
  while(f.available() && b)
  {
    char c = f.read();
    if(c != ((char) 10) && c != ((char) 32))
    {
      s+= c;
    }
    else
      b = false;
  }
  s.toLowerCase();
  if(s.equals("tempo:"))
  {
    int t = f.position();
    s = NULL;
    b = true;
    while(f.available() && b)
    {
      char c = f.read();
      if(c != ((char) 10) && c != ((char) 32))
      {
        s+= c;
      }
      else
        b = false;
    }
    int k = s.toInt();
    switch(i)
    {
       case 0:
       {
        tempo1 = k;
        break;
       }
      case 1:
       {
        tempo2 = k;
        break;
       }
      case 2:
       {
        tempo3 = k;
        break;
       }
      case 3:
       {
        tempo4 = k;
        break;
       }
      case 4:
       {
        tempo5 = k;
        break;
       } 
    }
    return f.position();
  }
  else
    return 0;
}
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Are you using an attachable shield for your Uno? That similar to a protoshield, meaning it has male pins that go into all the headers on the Uno. I too, have an Uno and a Mega, and also bought the Mega for more pins (Got my Mega yesterday). If you're lining the shield pins on the Mega to that of how it would be on the Uno, there's your problem. Read http://arduino.cc/de/Reference/SD to see which pins need to be changed. Pins 11,12 and 13 need to be changed to pins 50,51 and 52. The SS pin (Pin 10 on most arduino boards) needs to be moved to pin 53 on the Mega. I'm having this issue (sorta) too. http://arduino.cc/forum/index.php/topic,165170.0.html
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I tried doing that right now and it still shows that the two files couldn't be opened. Do I need to bend the pins? Also, do I need to change the port number to 53 (I changed both output and SD.begin() to ports 53)?
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Hi!

I found a fix to our issue! Instead of attaching your SD Card Shield to your board, go ahead and just lay it next to your Mega. Next, using some standard jumpers, connect pin 11 (SD Shield) to pin 51 (Mega), then connect pin 12 (SD) to pin 50 (Mega), then pin 13 (SD) to pin 52 (Mega), and finally; pin 4 OR 10 (SD) to pin 53 (Mega). After those four connections have been made, connect 5V from Mega, to 5V on Shield, and connect GND from Mega, to GND on shield.

EDIT: Didn't see your reply, you don't need to bend anything as long as you follow what I did above. You won't be able to use the pins on your SD Shield, but who cares, they're not taking up any space on your Mega except the 6 I told you to use. If you want though, you could bend the pins 4 or 10 and 11,12,13 pins out of the way, and wire it to the arduino, but if you ever plan to put the SD shield back on the Uno, you'll have a bad time. Also, I changed both to 53 and it worked.

Code:
  pinMode(53, OUTPUT);
   SD.begin(53)
« Last Edit: May 07, 2013, 04:37:26 pm by NoahDavis » Logged

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You're a LIFE SAVER!!! Thanks a LOT!!!!  smiley-grin

This helps me a TON in my Mentorship class! Without you, I'd be stuck with having to use the Uno in order to play music. And the Uno only allowed me to use 2 ports. And you know how songs sound better with multiple parts anyways. smiley-wink

Once again, THANKS!! smiley-grin
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Oh, no problem man.

I was trying to figure out how to connect my SD shield to my mega. It was a pain, already seeedstudio know the fix.
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I had the same problem.  I whipped up a proto board into a shield adapter








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