Cross-platform EEPROM routines for D21G

Hello all,

today I started working on D21G with the purpose to update existing installations.

After a few preliminary tests, I decided to make my software cross-platform, to avoid future problems with upgrades.

So I want to share with you my solution for the EEPROM library, hoping this will save time and effort to someone.

The library merges the four eeproms of D21G into a single one, which can be addressed normally using two methods:

uint8_t eeRead(uint16_t b)                           //returns the eeprom value stored in location b

uint8_t eeWrie(uint16_t b, uint8_t v)            //updates the eeprom value if different from stored value

These methods take care of everything, so they can be just dropped in your sketch and utilized for both D21G, 1286 and  32u4 

Here is an example sketch that performs a write/read test on the whole EEPROM using these two functions.

<code>

/**************************************************************************
 *
 * Abstract away platform differences in Industruino EEPROM library
 * Joins blocks using pointer array
 * Updates data in EEPROM only if different (save EEPROM life)
 * Take care of write timing
 * 
 * by ariel - ariel@ariel.international
 **************************************************************************/

#define IS_D21G false

#if IS_D21G
  #include <I2C_eeprom.h>
  #define DBPORT SerialUSB
   
  #define EEPAGE 4
  I2C_eeprom *ePage[EEPAGE];         //array of pointers
#else
  #include <EEPROM.h>
  #define DBPORT Serial
#endif

#define BAUD 115200
#define EESIZE 1024 

/**************************************
 * Read a byte from EEPROM
 *************************************/
 
uint8_t eeRead(uint16_t b) 
  {
#if IS_D21G
  return ePage[b>>8]->readByte(b & 0xFF);
#else
  return EEPROM.read(b);
#endif
  }

/**************************************
 * Write a byte to EEPROM
 *************************************/

void eeWrite(uint16_t b, uint8_t v) 
  {
#if IS_D21G
  if(ePage[b>>8]->readByte(b & 0xFF) != v)  //check if value is different
    ePage[b>>8]->writeByte(b & 0xFF, v);
    delay(5);               // NEEDED between successive writings
#else
  if(EEPROM.read(b) != v)  //check if value is different
    EEPROM.write(b, v);
#endif
  }

/**************************************
 * Prepare D21G EEPROM
 *************************************/

void setEeprom()
  {
#if IS_D21G  
  //create objects
  for(byte nE=0; nE<EEPAGE; nE++)
    {
    ePage[nE] = new I2C_eeprom(0x50+nE, EESIZE/EEPAGE);
    ePage[nE]->begin();
    }
#endif
  }

/***********************************/

//Setup
void setup() 
  {
  DBPORT.begin(BAUD);
  while (!DBPORT);    // wait for Serial Monitor
  DBPORT.println();

  DBPORT.println("CROSS-PLATFORM INDUSTRUINO EEPROM TEST");
  DBPORT.println("by ariel - ariel@ariel.international");
  DBPORT.println();
  DBPORT.println("Byte Write Read");
  DBPORT.println("---------------");
  
  //EEPROM test
  for (int i=0;i<=EESIZE;i++) 
    {
    //Write a byte in EEPROM cell
    byte d = random(256);
    eeWrite(i, d);
    nicePrint(i);
    nicePrint(d);
    nicePrint(eeRead(i));
    nicePrintln();
    }
  }

void loop() 
  {
  }

/**************************************
 * put space before numbers for nice printing
 *************************************/

void nicePrint(int n)
  {
  for(int nS=1;nS<5;nS++) 
    if(n<pow(10,nS)) DBPORT.print(' ');
  DBPORT.print(n);
  }

void nicePrintln() 
  {
  DBPORT.println();
  }

The output is:

CROSS-PLATFORM INDUSTRUINO EEPROM TEST
by ariel - ariel@ariel.international

Byte Write Read
---------------
    0  167  167
    1  241  241
    2  217  217
    3   42   42
    4  130  130
    5  200  200
    6  216  216
    7  254  254
    8   67   67
    9   77   77
   10  152  152
   11   85   85
   12  140  140
   13  226  226
   14  179  179
   15   71   71
   16   23   23
   17   17   17
   18  152  152
   19   84   84
   20   47   47
   21   17   17
   22   45   45
   ----

 

Enjoy!

CROSS PLATFORM EEPROM READ/WRITE FOR INT() AND FLOAT()

/*********************************
 * EEPROM routines
 */

//conversion buffer for EEPROM write/read
union
  {
  byte b[4];
  int i[2];
  float f;
  } convBuf;

//This function will write a 2 byte integer to the eeprom at the specified address and address + 1
void EEWrInt(int p_address, int p_value)
  {
  convBuf.i[0] = p_value;         //first int value
  for (byte nb=0; nb<2; nb++) eeWrite(p_address + nb, convBuf.b[nb]);
  }

//This function will read a 2 byte integer from the eeprom at the specified address and address + 1
unsigned int EERdInt(int p_address)
  {
  for (byte nb=0; nb<2; nb++) convBuf.b[nb] = eeRead(p_address + nb);
  return convBuf.i[0];          //first int value
  }

//This function will write a 4 byte integer to the eeprom at the specified address to address + 3
void EEWr32(int p_address, float p_value)
  {
  convBuf.f = p_value;  
  for (byte nb=0; nb<4; nb++) eeWrite(p_address + nb, convBuf.b[nb]);
  }

//This function will read a 4 byte integer from the eeprom at the specified address to address + 3
float EERd32(int p_address)
  {  
  for (int nb=0; nb<4; nb++) convBuf.b[nb] = eeRead(p_address + nb);   //fill buffer in original byte order
  return convBuf.f;
  }

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Stefano Giuseppe Bonvini

Stefano Giuseppe Bonvini

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| 4 1 3

Asked on 1/25/18, 2:02 PM

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As a nice bonus here are also the int() float() version of the read and write routines! /********************************* * EEPROM routines */ //conversion buffer for EEPROM write/read union { byte b[4]; int i[2]; float f; } convBuf; //This function will write a 2 byte integer to the eeprom at the specified address and address + 1 void EEWrInt(int p_address, int p_value) { convBuf.i[0] = p_value; //first int value for (byte nb=0; nb

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Stefano Giuseppe Bonvini

on 1/25/18, 5:24 PM

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