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» SD 10: Write binary data

This example shows how to turn on the SD card. Write binary data in SD file indicating the position to write.

Required Materials

1 x Waspmote PRO
1 x Battery
1 x SD card
1 x MiniUSB wire

Notes

* Remember that only 8.3 SHORT FILE NAME are valid for files and directories
* Make sure Waspmote is switched off before inserting or removing the SD card. Otherwise, the SD card could be damaged.
* Waspmote must not be switched off or reseted while there are ongoing read or write operations in the SD card. Otherwise, the SD card could be damaged and data could be lost. If you suspect that there may be some ongoing SD operations, wait a while until they are completed.

Code

/*  
 *  ------ [SD_10] - Write data to a SD file -------- 
 *  
 *  Explanation: Turn on the SD card. Write binary data in SD file
 *  indicating the position to write.
 *  
 *  Copyright (C) 2012 Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details. 
 *  
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 *  
 *  Version:           0.1 
 *  Design:            David Gascón 
 *  Implementation:    Yuri Carmona
 */


// define file name: MUST be 8.3 SHORT FILE NAME
char* filename="FILE10";

// define hexadecimal data
uint8_t data1[10]={ 0x30,0x31,0x32,0x33,0x00,0x35,0x36,0x37,0x38,0x39};
uint8_t data2[10]={ 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09};

void setup()
{
  // open USB port
  USB.ON();
  USB.println(F("SD_10 example"));

  // Set SD ON
  SD.ON();

  // Delete file if exists
  if(SD.del(filename)) 
  {
    USB.println(F("file deleted"));
  }
  else 
  {
    USB.println(F("file NOT deleted"));  
  }

  // Create file
  if(SD.create(filename))
  {
    USB.println(F("file created"));
  }
  else 
  {
    USB.println(F("file NOT created"));  
  } 

}


void loop()
{     

  ///////////////////////////////////////////////////
  // 1. write hexadecimal data1 (offset=0; length:10)
  ///////////////////////////////////////////////////
  if(SD.writeSD(filename, data1, 0, 10)) 
  {
    USB.println(F("write OK"));
  }
  else 
  {
    USB.println(F("write failed")); 
  }
  
   /////////////////////////////////////////////////// 
  // 2. append hexadecimal data2 (length:10)
  ///////////////////////////////////////////////////
  if(SD.append(filename, data2, 10))
  {
    USB.println(F("append OK"));
  }
  else 
  {
    USB.println(F("append failed"));
  }

  ///////////////////////////////////////////////////
  // 3. show binary file
  ///////////////////////////////////////////////////
  showBinaryFile();
  delay(5000);

}




/*****************************************************
 * Local Function in order to show the file contents
 *
 *****************************************************/
void showBinaryFile()
{
  // show file
  USB.println(F("Show file:"));      
  USB.println(F("-------------------"));
  SD.catBin(filename, 0, SD.getFileSize(filename));
  for(int i=0; i<SD.getFileSize(filename); i++)
  {
    USB.printHex(SD.bufferBin[i]);
    if( i >= sizeof(SD.bufferBin) )
    {
      break;
    }
  }
  USB.println(F("\n-------------------"));
}

Output

B#
SD_10 example
file deleted
file created
write OK
append OK
Show file:
-------------------
3031323300353637383900010203040506070809
-------------------
...

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