question about store word variable in eeprom

[mehran.rivandi]

how can store a word variable in eeprom ?

i have a word array .

for example : m var word [10]

i want to store my array in eeprom .

and then read form eeprom .

it is very important for me .

please help me .

software : pic basic pro .
microprocessor : pic16f877a

 

[skogsjanne]

If you have a bytewide EEPROM you store the data byte by byte.

 

[alexan_e]

If you know how to write a byte in the eeprom then use a union to declare an array of bytes and write its data to the eeprom using a loop

https://www.edaboard.com/threads/243922/#post1043665

 

[mehran.rivandi]

ok i work basic not c .

and then i want store just highbyte of word array in to the eeprom .

 

[skogsjanne]

I don't know BASIC but there is obviously some method to split words into bytes. Then you just store them the way you like.

 

[mehran.rivandi]

ok .

thanks .

this is my method to store word into the eeprom

    for  i = 1 to 10

            write   i          ,    m.LowByte[i]
            write   i+10     ,    m.HighByte[i]

        next i

and this is my method to read word from eeprom .

   for i = 1 to 10

           read   i          ,      m.LowByte[i]
           read   i+10     ,      m.HighByte[i]
     
     next i

this code is for pic basic pro software .

you think it is correct ?

---------- Post added at 22:44 ---------- Previous post was at 22:43 ----------

you think is it correct ?

 

[FvM]

If you look to the compiler manual, you'll notice, that word and long entities can be written with a single instruction.

 

[mehran.rivandi]

i don't know .

can you help me ?

 

[FvM]

WRITE Address,{WORD}{LONG}Value {,Value...}

Write byte, word or long (if PBPL used) Values to the on-chip EEPROM at the specified Address.

 

[mehran.rivandi]

excuse me can you write an example of my code ?

---------- Post added at 23:45 ---------- Previous post was at 23:28 ----------

THIS IS MY CODE

'******************************************************************************************
' this program is for testing of read and write word array in to eeprom and display on lcd 
'******************************************************************************************

define LCD_DREG   PORTD
define LCD_DBIT   4
define LCD_RSREG  PORTD       
define LCD_RSBIT  2
define LCD_EREG   PORTD       
define LCD_EBIT   3
define LCD_BITS   4         
define LCD_LINES  2     


H var byte
L var byte

m var word [1] 
 
main:

m[0] = $4142   ' 41 = A   and  42 = B


write 1,m.highbyte [0] 
write 2,m.lowbyte [0] 


read 1,H 
read 2,L  

LCDOut $FE,1,H
Pause 2000


LCDOut $FE,1,L
Pause 2000


goto main
end

 

[FvM]

Sorry, I'm not using BASIC since 20 years or so. The manual syntax is obvious in my view.

It implements, what most programmers would do in this case, storing a word in two consecutive memory cells. The memory addresses have to be incremented by two.

Something like

write 2*i, word m[i]

 

[mehran.rivandi]

THIS CODE WORKS CORRECTLY .

BUT I WANT YOUR CODE .

WRITE Address,{WORD}{LONG}Value {,Value...}

Write byte, word or long (if PBPL used) Values to the on-chip EEPROM at the specified Address.

---------- Post added 15-03-12 at 00:05 ---------- Previous post was 14-03-12 at 23:51 ----------

OK THANKS YOUR CODE WORK CORRECTLY . I CHANGE MY CODE AND COMPILE IT AND IT WORKS CORRECTLY .
THIS IS a new code .

'******************************************************************************************
' this program is for testing of read and write word array in to eeprom and display on lcd 
'******************************************************************************************

define LCD_DREG   PORTD
define LCD_DBIT   4
define LCD_RSREG  PORTD       
define LCD_RSBIT  2
define LCD_EREG   PORTD       
define LCD_EBIT   3
define LCD_BITS   4         
define LCD_LINES  2     


H var byte
L var byte
 I VAR BYTE
m var word [1] 
 
main:

m[0] = $4142   ' 41 = A   and  42 = B

 
write 1, WORD m[0]
 
read 1,L 
read 2,H  

LCDOut $FE,1,H
Pause 2000


LCDOut $FE,1,L
Pause 2000


goto main
end

---------- Post added at 00:10 ---------- Previous post was at 00:05 ----------

i think it is better

'******************************************************************************************
' this program is for testing of read and write word array in to eeprom and display on lcd 
'******************************************************************************************

define LCD_DREG   PORTD
define LCD_DBIT   4
define LCD_RSREG  PORTD       
define LCD_RSBIT  2
define LCD_EREG   PORTD       
define LCD_EBIT   3
define LCD_BITS   4         
define LCD_LINES  2     


H var byte
L var byte
 I VAR BYTE
m var word [1] 
 
main:

m[0] = $4142   ' 41 = A   and  42 = B

for i = 0 to 10 
write (2*i)+1, WORD m[0]
next i 
      
read 1,L 
read 2,H  

LCDOut $FE,1,H
Pause 2000


LCDOut $FE,1,L
Pause 2000


goto main
end

---------- Post added at 00:11 ---------- Previous post was at 00:10 ----------

for i = 0 to 10 
write (2*i)+1, WORD m[i]
next i