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Help! two dimensions Array

 
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Mk
Guest
Help! two dimensions Array
PostPosted: Mon Apr 26, 2004 1:05 am     Reply with quote
hi! i need help on a two dimensions Array, i am trying to write some data into an eeprom(24lc256) and read the data out, i am using a pic16f877a. i am still new to pic, i tried to search all the possible info from the discussion board for all this weekend, but they were too advance to me, so can someone help me on this problem?

here is a sample code:

int i,j;
const char record[2][7]={"abcdef","123456"}; if i put 1234567 then i got error message "string too long", next problem is:

for (i=0; i<=2; ++i)
{
write_ext_eeprom(?,????) <--- i got stuck here don't know how, because according to write_ext_eeprom only can have one address one byte data, but i have 7 bytes data???? for one address, how can i solve this problem?? help!
}


thank you!
Ttelmah
Guest
Re: Help! two dimensions Array
PostPosted: Mon Apr 26, 2004 1:59 am     Reply with quote
Mk wrote:
hi! i need help on a two dimensions Array, i am trying to write some data into an eeprom(24lc256) and read the data out, i am using a pic16f877a. i am still new to pic, i tried to search all the possible info from the discussion board for all this weekend, but they were too advance to me, so can someone help me on this problem?

here is a sample code:

int i,j;
const char record[2][7]={"abcdef","123456"}; if i put 1234567 then i got error message "string too long", next problem is:

for (i=0; i<=2; ++i)
{
write_ext_eeprom(?,????) <--- i got stuck here don't know how, because according to write_ext_eeprom only can have one address one byte data, but i have 7 bytes data???? for one address, how can i solve this problem?? help!
}


thank you!

First part, is a general 'C' question. In C, strings have a _null terminator character_. Hence the string "1234567", is actually _eight_ characters long. Hence the 'string too long' message.
Second part. Data in arrays is stored sequentially in memory. So you can use:
Code:

   //Beware here. A loop from 0 to <=2, loops three times.
   for (i=0; i<2; ++i)
   {
      for (c=0;c<7;c++) write_ext_eeprom(i*7+c,record[i][c]);
   }


Best Wishes
Mk
Guest
Re: Help! two dimensions Array
PostPosted: Mon Apr 26, 2004 4:24 pm     Reply with quote
Hi! Ttelmah,
thanks for the help, i have a question on the address of the write_ext_eeprom (i*7+c,record[i][c]); ( i*7 + C) , so i have to use the upper 4 bits of the address, am i right? if i am right, what are those lower 4 bits for?

thanks!
Quote:

Second part. Data in arrays is stored sequentially in memory. So you can use:
Code:

   //Beware here. A loop from 0 to <=2, loops three times.
   for (i=0; i<2; ++i)
   {
      for (c=0;c<7;c++) write_ext_eeprom(i*7+c,record[i][c]);
   }


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