Help;; eeprom won't read/write beyond address 255

[DDDvvv]

hi everyone.
im trying a memory intensive app on a 18f2620, where i need to read/write ascii characters onto eeprom. this pic has 1024 eeprom bytes, but for some reason, i cannot read/write beyond address 255.

program compiles ok but it shows black pixels on an lcd when i use this command:

data @300, "a","s","c","i","i"

i try to read at any of the above locations, and i get no values. works ok if i use any address under 255.

what im i missing?

thanks for reading

[DDDvvv]

im reading the datasheet, and im thinking that it has something to do with the EEADR register, that controls the address, being 8 bit (256 values).

so, is there life after address 255 in picbasic, or do i have to use external memory?

thanks

[ScaleRobotics]

I notice that in my PBP file, the 18f2620.bas file of mine has this line commented out. Have you tried uncommenting it out? This is the line that tells pbp how big the EEProm is, so without it, PBP can't know its larger than usual.

'EEPROM  $F00000, $F003FF

[Acetronics2]

Hi, DDDvvv

EDIT : 300dec <> 300 hex !!! ... ::lol::

300 dec = $12C ...

no bug on my side ... just need to have a new pair of glasses ( it's true ! ) and scroll slowlier through MPLAB Window ...
I had tested it for the 2525 too ... didn't see anything nor ...

Alain

[ScaleRobotics]

Ah, now I see why it is commented out....

WARNING Line 29: $F00000 Numeric overflow, value truncated. (18F2620.BAS)
WARNING Line 29: $F003FF Numeric overflow, value truncated. (18F2620.BAS)

Right you are Alain.

[DDDvvv]

thanks for replying guys.
i get the same error if i uncomment the eeprom line.

im sure there's some workaround in assembly, but for now, its off to i2c external memory and a pic with no eeprom. hopefully, i dont get the same error on using external memory.

[Bruce]

This works fine with PBP 2.60a and MPLAB ver 8.53.

DATA @300, "a","s","c","i","i"
 
Dat VAR BYTE
Index VAR WORD
 
Main:
    FOR Index = 300 TO 304
        READ Index,Dat
        HSEROUT [Dat,13,10]
    NEXT
Here:
    GOTO Here

Spits it out as expected in the serial output window, and MPLAB shows all data in the EEPROM view window.

Of course you need a word size variable for the index pointer when the address is > 255.

[KVLV]

hi I bring this thread up because i have trouble compiling eeprom passed the 256 bytes
chip used 18f2620 it has 1024x8 byte of eeprom

pbp pro version 2.60a
mplab ide 8.63
mpasm v5.39
microcode studio 4.0.0.0

so please point out what i did wrong.
Please help and thank you.

I have tried both the DATA and EEPROM, both cannot compile more than 256 byte of eeprom

my code is enclosed.

 '****************************************************************
'*  Name    : UNTITLED.BAS                                      *
'*  Author  : KVLV                                              *
'*  Notice  : Copyright (c) 2010 VANCOUVER                      *
'*          : All Rights Reserved                               *
'*  Date    : 12/27/2010                                        *
'*  Version : 1.0                                               *
'*  Notes   :                                                   *
'*          :                                                   *
'****************************************************************
'chip use 18F2620
'
DEFINE LOADER_USED 1 'for bootstrap loader
define OSC 20
'define HSER_BAUD 19200  ' on pc side set to 19200 8N1 (8 data bits, no parity bit, 1 stop bit)
define HSER_BAUD 19200
' Set receive register to receiver enabled
DEFINE HSER_RCSTA 90h  
' Set transmit register to transmitter enabled
DEFINE HSER_TXSTA 20h  

INCLUDE "Modedefs.bas"

L var word
B var word
M var word
temp var word
'Mask var byte
X var word  '[5]
'Y VAR BIT[40]
C VAR word
S var byte[5]

data %00000000, %00000000, %00000000, %00000000, %00000000 'space
data %00000000, %00000000, %01111001, %00000000, %00000000 '!
data %00000000, %01110000, %00000000, %01110000, %00000000 'double_quotes
data %00010100, %01111111, %00010100, %01111111, %00010100 'hash
data %00010010, %00101010, %01111111, %00101010, %00100100 'dollar_sign
data %01100010, %01100100, %00001000, %00010011, %00100011 'percent
data %00110110, %01001001, %01010101, %00100010, %00000101 'ampersand
data %00000000, %01010000, %01100000, %00000000, %00000000 'apostrophe
data %00000000, %00011100, %00100010, %01000001, %00000000 'left_parenthesis
data %00000000, %01000001, %00100010, %00011100, %00000000 'right_parenthesis
data %00010100, %00001000, %00111110, %00001000, %00010100 'asterisk
data %00001000, %00001000, %00111110, %00001000, %00001000 'plus
data %00000000, %00000101, %00000110, %00000000, %00000000 'comma
data %00001000, %00001000, %00001000, %00001000, %00001000 'minus
data %00000000, %00000011, %00000011, %00000000, %00000000 'full_stop
data %00000010, %00000100, %00001000, %00010000, %00100000 'forward_slash
data %00111110, %01000101, %01001001, %01010001, %00111110 'zero
data %00000000, %00100001, %01111111, %00000001, %00000000 'one
data %00100001, %01000011, %01000101, %01001001, %00110001 'two
data %01000010, %01000001, %01010001, %01101001, %01000110 'three
data %00001100, %00010100, %00100100, %01111111, %00000100 'four
data %01110010, %01010001, %01010001, %01010001, %01001110 'five
data %00011110, %00101001, %01001001, %01001001, %00000110 'six
data %01000000, %01000111, %01001000, %01010000, %01100000 'seven
data %00110110, %01001001, %01001001, %01001001, %00110110 'eight
data %00110000, %01001001, %01001001, %01001010, %00111100 'nine
data %00000000, %00110110, %00110110, %00000000, %00000000 'colon
data %00000000, %00110101, %00110110, %00000000, %00000000 'semicolon
data %00001000, %00010100, %00100010, %01000001, %00000000 'less_than
data %00010100, %00010100, %00010100, %00010100, %00010100 'equals
data %00000000, %01000001, %00100010, %00010100, %00001000 'greater_than
data %00100000, %01000000, %01000101, %01001000, %00110000 'question_mark
data %00100110, %01001001, %01001111, %01000001, %00111110 'at
data %00111111, %01000100, %01000100, %01000100, %00111111 'A
data %01111111, %01001001, %01001001, %01001001, %00110110 'B
data %00111110, %01000001, %01000001, %01000001, %00100010 'C
data %01111111, %01000001, %01000001, %00100010, %00011100 'D
data %01111111, %01001001, %01001001, %01001001, %01000001 'E
data %01111111, %01001000, %01001000, %01001000, %01000000 'F
data %00111110, %01000001, %01001001, %01001001, %00101111 'G
data %01111111, %00001000, %00001000, %00001000, %01111111 'H
data %00000000, %01000001, %01111111, %01000001, %00000000 'I
data %00000010, %00000001, %01000001, %01111110, %01000000 'J
data %01111111, %00001000, %00010100, %00100010, %01000001 'K
data %01111111, %00000001, %00000001, %00000001, %00000001 'L
data %01111111, %00100000, %00011000, %00100000, %01111111 'M
data %01111111, %00010000, %00001000, %00000100, %01111111 'N
data %00111110, %01000001, %01000001, %01000001, %00111110 'O
data %01111111, %01001000, %01001000, %01001000, %00110000 'P
data %00111110, %01000001, %01000101, %01000010, %00111101 'Q
data %01111111, %01001000, %01001100, %01001010, %00110001 'R
data %00110001, %01001001, %01001001, %01001001, %01000110 'S
data %01000000, %01000000, %01111111, %01000000, %01000000 'T
data %01111110, %00000001, %00000001, %00000001, %01111110 'U
data %01111100, %00000010, %00000001, %00000010, %01111100 'V
data %01111110, %00000001, %00001110, %00000001, %01111110 'W
data %01100011, %00010100, %00001000, %00010100, %01100011 'X
data %01110000, %00001000, %00000111, %00001000, %01110000 'Y
data %01000011, %01000101, %01001001, %01010001, %01100001 'Z
data %00000000, %01111111, %01000001, %01000001, %00000000 'left_square
data %00100000, %00010000, %00001000, %00000100, %00000010 'back_slash
data %00000000, %01000001, %01000001, %01111111, %00000000 'right_square
data %00010000, %00100000, %01000000, %00100000, %00010000 'circumflex
data %00000001, %00000001, %00000001, %00000001, %00000001 'underscore
data %00000000, %01000000, %00100000, %00010000, %00000000 'grave_accent
data %00000010, %00010101, %00010101, %00010101, %00001111 'a
data %01111111, %00001001, %00001001, %00001001, %00000110 'b
data %00001110, %00010001, %00010001, %00010001, %00010001 'c
data %00000110, %00001001, %00001001, %00001001, %01111111 'd
data %00001110, %00010101, %00010101, %00010101, %00001101 'e
data %00000000, %00001000, %00111111, %01001000, %00100000 'f
data %00001001, %00010101, %00010101, %00010101, %00011110 'g
data %01111111, %00001000, %00001000, %00001000, %00000111 'h
data %00000000, %00000000, %00101111, %00000000, %00000000 'i
data %00000010, %00000001, %00000001, %01011110, %00000000 'j
data %00000000, %01111111, %00000100, %00001010, %00010001 'k
data %00000000, %01000001, %01111111, %00000001, %00000000 'l
data %00011111, %00010000, %00001110, %00010000, %00011111 'm
data %00011111, %00001000, %00010000, %00010000, %00001111 'n
data %00001110, %00010001, %00010001, %00010001, %00001110 'o
data %00011111, %00010100, %00010100, %00010100, %00001000 'p
data %00001000, %00010100, %00010100, %00010100, %00011111 'q
data %00011111, %00001000, %00010000, %00010000, %00001000 'r
data %00001001, %00010101, %00010101, %00010101, %00010010 's
data %00010000, %00010000, %01111110, %00010001, %00010010 't
data %00011110, %00000001, %00000001, %00000001, %00011110 'u
data %00011100, %00000010, %00000001, %00000010, %00011100 'v
data %00011110, %00000001, %00000110, %00000001, %00011110 'w
data %00010001, %00001010, %00000100, %00001010, %00010001 'x
data %00010000, %00001001, %00000110, %00001000, %00010000 'y
data %00010001, %00010011, %00010101, %00011001, %00010001 'z
data %00001000, %00110110, %01000001, %01000001, %00000000 'leftcurly
data %00000000, %00000000, %01111111, %00000000, %00000000 'vertline
data %00000000, %01000001, %01000001, %00110110, %00001000 'rightcurly
data %00000100, %00001000, %00001000, %00001000, %00010000 'tilde
data %01111111, %01000001, %01000001, %01000001, %01111111 'del 


TRISA=%00000000       '0=output
TRISB=%00000000       '1 = input
TRISC=%00000000
ADCON0=%11000000
ADCON1=%00000111
CMCON =%00000111                   ' Comparators = off

INTCON2.7=0 ' Enable Pull-Up's    PIC18F2620   'VERIFIED

Main:
    
'    temp=l
    
'    'display data sideway
'    for M=0 to 4
'        read l,x
        
'        hserout ["L:",dec3 l, " X:",bin8 x,13,10]
'        l=l+1
'        if l>175 then 
'            l=170
'        endif
       
'    next m   
'    s[0]= %01111111     'these lines work
'    s[1]= %01000001
'    s[2]= %01000001
'    s[3]= %01000001
'    s[4]= %01111111
    
'      for c=470 to 474
'           write c,s[c-470]
'           pause 1
'      next c
      
      
      
      for c=0 to 475 step 5
        hserout ["C:", dec c,13,10]
        gosub rotate
      next c
      
      hserout ["That's all folk!",13,10]
    
    END 





goto main


'-----------------
'setup variable
'set c as location of 
'call this
'ex:
' c=0
' gosub rotate
'
Rotate:   'rotate 90 counterclockwise
    l=c
    temp=l
    for m=0 to 4
        read l, x
        hserout [bin x.7]
        l=l+1
    next m
    hserout [13,10]
 
    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.6]
        l=l+1
    next m
    hserout [13,10]

    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.5]
        l=l+1
    next m
    hserout [13,10]

    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.4]
        l=l+1
    next m
    hserout [13,10]

    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.3]
        l=l+1
    next m
    hserout [13,10]

    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.2]
        l=l+1
    next m
    hserout [13,10]

    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.1]
        l=l+1
    next m
    hserout [13,10]

    l=temp
    for m=0 to 4
        read l, x
        hserout [bin x.0]
        l=l+1
    next m
    hserout [13,10,13,10]  

return

[Dave]

KVLV, Are you sure you are compiling it with the right chip selected? I have been using 18F2620's for the last few years with almost all of the eeprom used. I have never had such a problem. Your code at first glance looks as though it should work.

Dave Purola,
N8NTA