18f452 internal eprom help

What is the best way for my to store a table containing 40 (16 bit values) using the DATA command as i only want to store them once at program time.

i understand the explaination in the manaul for storing 8 bit values as below

' Store 10, 20 and 30 starting at location 5
DATA @5,10,20,30

But i can't get my head round this bit for 16 bit values
' Assign a label to a word at the next location
dlabel DATA word $1234 ' Stores $34, $12


assuming i am going to store the following
Value1=1000 ' at address 0 & 1
Value 2=2000 'at address 2 & 3
Value3 =3000 'at address 4 & 5

How can i do this ?

Toni

data @0 232,003,208,007,184,011

I calculate these as follows:

1000 dec = 0000 0011 1110 1000 bin

003 dec = 0000 0011 (byte1)
232 dec = 1110 1000 (byte0)

2000 dec = 0000 0111 1101 0000 bin

007 dec = 0000 0111 bin (byte1)
208 dec = 1101 0000 bin (byte0)

3000 dec = 0000 1011 1011 1000 bin

011 dec = 0000 1011 bin (byte1)
184 dec = 1011 1000 bin (byte0)

Hope this helps

Thank you very much for your reply.
that was very useful as i just used a spare 24lc128 that i had,
wrote the 40 word values to it and read it back the contains from addresses in bytes i then used the DATA command.
This works on a 16f877 but i still can get it to work on a 18f452

data @0 232,003,208,007,184,011


Toni

What version of PBP are you using? Ver 2.42 had problem storing stuff to the eeproom. That has since been corrected in 2.45. I believe it had something to do with not being able to write to either the odd or even eeprom address locations.

I Have pbp 2.45 only just got about 2 weeks ago

Toni,
i can comfirm that pbp2.45 does not have that problem
Although i tested the Read/Write command on a 18f452 and i am using pbp2.45 and it works below is the code i am not quite sure how to do this using the DATA@ command.
i am presently trying to work out how to do this

Best Regards
Isaac




DEFINE LOADER_USED 1 ' uses a bootloader

@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H

Define OSC 20
clear

DEFINE LCD_DREG PORTD ' Use Portd for LCD Data
DEFINE LCD_DBIT 4 ' Use Upper(4) 4 bits of Port
' PORTD-4 thru PORTD-7 connects to
' LCD DB4 thru LCD DB-7 respectively
DEFINE LCD_RSREG PORTE ' PORTE for RegisterSelect (RS) bit
DEFINE LCD_RSBIT 0 ' PORTE-0 pin for LCD's RS line
DEFINE LCD_EREG PORTE ' PORTE for Enable (E) bit
DEFINE LCD_EBIT 1 ' PORTE-1 pin for LCD's E line

DEFINE LCD_BITS 4 ' Using 4-bit bus
DEFINE LCD_LINES 2 ' Using 2 line Display
DEFINE LCD_COMMANDUS 2000 ' Command Delay (uS)
DEFINE LCD_DATAUS 50 ' Data Delay (uS)

' ** Define LCD Control Constants **

I CON 254 ' Control Byte
Clr CON 1 ' Clear the display
Line1 CON 128 ' Point to beginning of line 1
Line2 CON 192 ' Point to beginning of line 2


' Software Defines
' ----------------
' ** Declare the Variables **
Temp VAR word ' General Purpose
Data_Out VAR word ' Data read from the Eeprom
Data_In VAR word ' Data written to the Eeprom
address VAR word' Address

'
' Initialise Hardware
' -------------------
ADCON1=7
TRISA=%00000000
TRISB=%00000000
TRISC=%10000000
TRISD=%00000000


Pause 1000
lcdout I,Clr:Pause 30
lcdout I,Line1," 18F452 TEST "
lcdout I,Line2+2,"..Power On.. !!"
Pause 1000 '
Data_Out=0: Data_In =0: Temp =0

'WRITE SUB
'=======
For address = 0 TO 100 STEP 2 ' Loop 50 times
Data_In =Temp ' Data_In is data for EPPROM
WRITE address,Data_In.LowByte
WRITE (address+1),Data_In.HighByte
Pause 10 ' Delay 10ms after each write
Temp =Temp + 1000 ' Add 1000 to the previous value
Next address



loop:
'READ SUB
'=======
For address = 0 TO 100 STEP 2 ' Loop 50 times
lcdout I,Clr:Pause 30
READ address,Data_Out.LowByte
READ (address+1),Data_Out.HighByte
lcdout I,Line1+2," Eprom Values :"
lcdout I,Line2+2,#address,": ",#Data_Out ' Display Eprom Data

Pause 1000
Next address
GoTo loop

End

Sorry Toni
You have got me going now. i have being trying the Data command but it don't work on the 18f452 which is a shame .
i wonder why someone from Melab hasn't responded to your qury.
i would like to know myself

Isaac

Thanks Isaac for your efforts
But i am still in the same boat as i started.
DOES THE NEW PBP SUPPORT THE DATA COMMAND ?

If you have V.2.45 then surely it should take you all of two minutes to find out if it works for you... (1) write a simple program using DATA statements, (2) program your preferred chip, (3) read back the contents of EEPROM using your programmer. You don't even have to run your PIC in a circuit.

According to MeLabs...

http://www.melabs.com/support/upgrade.htm#pbp

Previous Release: 2.44...

Changes PIC18Fxxxx DATA and EEPROM to allow odd locations.

Melanie

The DATA command works fine for me. I use it to preload my eeprom addresses at programming time. From then on I use the READ and WRITE commands and everything has worked just fine since I upgraded to 2.45 from 2.42. Try posting the code Toni and maybe there is something that is being over looked.

Hi Mel ,Isaac & CocaColaKid
Thank you very much for your help i have tried the following code on both the 16f877 and the 18f452 and this does confirm my fears
PBP DOES NOT SUPPORT the DATA@ command in version 2.45
the errors are still there or is there something i am missing here?
Although the link Mel gave below of which i have quoted says that in version 2.44 this was corrected , i can't figure out why this don't work in version 2.45 which is what i have here.
Could someone please prove me wrong as i don't want to be right on this .

DEFINE LOADER_USED 1 ' uses a bootloader

@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H

Define OSC 20
clear

DEFINE LCD_DREG PORTD ' Use Portd for LCD Data
DEFINE LCD_DBIT 4 ' Use Upper(4) 4 bits of Port
' PORTD-4 thru PORTD-7 connects to
' LCD DB4 thru LCD DB-7 respectively
DEFINE LCD_RSREG PORTE ' PORTE for RegisterSelect (RS) bit
DEFINE LCD_RSBIT 0 ' PORTE-0 pin for LCD's RS line
DEFINE LCD_EREG PORTE ' PORTE for Enable (E) bit
DEFINE LCD_EBIT 1 ' PORTE-1 pin for LCD's E line

DEFINE LCD_BITS 4 ' Using 4-bit bus
DEFINE LCD_LINES 2 ' Using 2 line Display
DEFINE LCD_COMMANDUS 2000 ' Command Delay (uS)
DEFINE LCD_DATAUS 50 ' Data Delay (uS)

' ** Define LCD Control Constants **

I CON 254 ' Control Byte
Clr CON 1 ' Clear the display
Line1 CON 128 ' Point to beginning of line 1
Line2 CON 192 ' Point to beginning of line 2

data@0, 0,10,20,30,40,50,60,70,80,90,100
' Software Defines
' ----------------
' ** Declare the Variables **
Temp VAR byte ' General Purpose
Data_Out VAR byte' Data read from the Eeprom
Data_In VAR byte ' Data written to the Eeprom
address VAR byte' Address


'
' Initialise Hardware
' -------------------
ADCON1=7
TRISA=%00000000
TRISB=%00000000
TRISC=%10000000
TRISD=%00000000


Pause 1000
lcdout I,Clr:Pause 30
lcdout I,Line1," 18F452 TEST "
lcdout I,Line2+2,"..Power On.. !!"
Pause 1000 '


loop:
'READ SUB
'=======
For address = 0 TO 10 ' Loop 50 times
lcdout I,Clr:Pause 30
READ address,Data_Out
lcdout I,Line1+2," Eprom Values :"
lcdout I,Line2+2,#address,": ",#Data_Out ' Display Eprom Data

Pause 1000
Next address
GoTo loop

End

'With 16F877
'===========
' I get the correct values written to the eeprom and read back as follows
' address 0 = 0
' address 1 = 10
' address 2 = 20
' address 3 = 30
' address 4 = 40
' address 5 = 50
' address 6 = 60
' address 7 = 70
' address 8 = 80
' address 9 = 90
' address 10 = 100

'With 18F452
'===========
' I get the values written to the eeprom and read back as follows
' address 0 = 0
' address 1 = 20
' address 2 = 40
' address 3 = 60
' address 4 = 80
' address 5 = 100
' address 6 = 0
' address 7 = 0
' address 8 = 0
' address 9 = 0
' address 10 = 0

Toni,

as mentioned earlier, I have had the same problem with the 18F series.
(on the 16F series DATA works just fine)

I have solved it by updating all my tools to the latest versions.
see:
http://www.picbasic.co.uk/forum/show...=&threadid=255

To me it looks like the results one gets depend on the combination of tools you are using. (MPASM, Programmer-Software, etc.)
It's not just the version of PBP.

in PBP 2.44 (or higher) "DATA" is supposed to work but it does not really (at least not on the 18F)

In the thread mentioned above I have described some kind of "workaround", have you tried this ?



--------------------------------------------------------------

There appear to be 10 types of Forum members:
The ones having that problem
and the ones not having that problem

Thanks for the work around
But i still feel its a con by Melab so say that the problem has being fixed when it actually hasn't.
i specifically upgraded my complier for this partticulat reason

ITS A SHAME

The problem IS fixed... see the new FAQ section for in-depth details.