Byte array - 2D

Projects Programming
1

Good Morning,

I've:

byte array [30] [12] = {
//as many vals as dim1
{0,0,0},
{0,0,0}//as many rows as dim0
};

and I would like feel up it reading my eeprom address ...

where the record0 is from 0-12 the record1 is from 13-26, the record2 is from 27-39 until the record 31 ...

so now for fill up a record for 1 dimensional array should be like this:

byte memoria[416];
void LeggiEeprom()
{
  int ind;
   for (ind =0; ind <= 416 ; ind++)
      {
        // memoria[ind] = EEPROM.read(ind);
        memoria[ind] = readEEPROM(disk1, ind);
      }
 
}

how could I fill the bi dimensional array ?

Could you help kindly ?

thanks,
gnux

2

To fill a 2 dimensional array you need 2 nested loops

for (int row = 0;row <= 29;row++)
{
  for (int column = 0;column <= 11;column++)
  {
    array[column][row] = whatever you want in this position
  }
}

Where is the data coming from for the array ?

3

HI Bob,
thanks for the idea ... I've did something like that :

#define disk1 0x50    //Address of 24LC256 eeprom chip
#include <Wire.h>

byte array [30] [12] = {
   //as many vals as dim1
  {0,0,0},
  {0,0,0}//as many rows as dim0
};


byte readEEPROM(int deviceaddress, unsigned int eeaddress ) 
{
  byte rdata = 0xFF;
 
  Wire.beginTransmission(deviceaddress);
  Wire.write((int)(eeaddress >> 8));   // MSB
  Wire.write((int)(eeaddress & 0xFF)); // LSB
  Wire.endTransmission();
 
  Wire.requestFrom(deviceaddress,1);
 
  if (Wire.available()) rdata = Wire.read();
 
  return rdata;
}

void writeEEPROM(int deviceaddress, unsigned int eeaddress, byte data ) 
{
  Wire.beginTransmission(deviceaddress);
  Wire.write((int)(eeaddress >> 8));   // MSB
  Wire.write((int)(eeaddress & 0xFF)); // LSB
  Wire.write(data);
  Wire.endTransmission();
 
  delay(5);
}

void setup()
{
  int n,m,z,k,l,i,c;
  n = 416;
  k = 0; 
  z = 0;
  Serial.begin(9600);
  
  for (i =0; i >= n ; i = i +13)
      {
        m = k * 13;
        c = 0;
        for ( l = m ; l > (m + 13); l++)
             { 
               array[k][c] = readEEPROM(disk1, l);
               c = c + 1; 
             }  
       k = k + 1;
           
       }   
}



void  loop()
{  
delay(4000); 
  
}

I think could be fine, what do you think ?

thanks gnux

4 
 n = 416;
...  
  for (i =0; i >= n ; i = i +13)

That's going to be a short loop.

5

gnusso:
I think could be fine, what do you think ?

I think it look very complicated just to fill up a 2 dim array.
How many rows of data are there ?
How many columns are there in each row ?

Your array dimensions allow for 30 rows of 12 values. Is that right ?
Do you want to fill up each row then move on to the next row or fill up each column then move on to the next column ?