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 Posted: Jan 28, 2012 - 01:55 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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I see in the programming section a way to preload information into the eeprom space. I believe it is looking for an .elf file. Anyone suggest a for dummies paper on how this is done?
Jim |
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Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first 
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Posted: Jan 28, 2012 - 02:05 PM |
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Joined: Feb 12, 2005
Posts: 16329
Location: Wormshill, England
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Use file.EEP or file.ELF
You can put any HEX file into the EEPROM if it fits.
All that you are really worrying about is that you should not erase the chip when you program the FLASH.
In practice, you would either:
1. Erase, program flash, program eeprom
or:
1. Erase
2. program eeprom
3. program flash
or:
1. set EESAVE fuse
2. erase and program flash or eeprom in any order you like
You can either put all the operations into an avrdude.exe, stk500.exe, ... command (or batch file)
Or put all the operations into a single ELF file
The EESAVE method seems the most foolproof method.
David. |
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Posted: Jan 28, 2012 - 02:18 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Well, the project I am trying to finish is itting on the bench with debugwire from the dragon connected to the M48.
So right now I would like to load that up during debugging. After that I will be loading everything either through stk500 or ISPMKII.
What is the format for the .eep/.elf file? Is it something I can create in excel or notepad and change the extension to .elf or .eep?
Jim |
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Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 02:47 PM |
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Joined: Feb 12, 2005
Posts: 16329
Location: Wormshill, England
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An EEP file is exactly the same as a HEX file. It is only a convention that you keep the two files together by sharing a name.
You can write an ELF file with GCC. I doubt that many other toolsets support the 'fuses' aspect of it.
You can also construct a production ELF file from the constituent eeprom, flash, fuses, lock in Studio4. It is a lot of faffing about.
Surely you just set EESAVE fuse and go. It must be the easiest method.
If your application has some initialised __eeprom data, the debugger will read this in regardless.
Personally, I never use initialised __eeprom. I read the existing contents, determine whether virginal, and the application writes any initial data.
Subsequent runs use the non-virginal data.
David. |
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Posted: Jan 28, 2012 - 03:07 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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??GCC?? Nevermind. I'll figure something else out. GCC is not simple for me to grasp. I would not even know where to start just to create a simple file to load into the eeprom.
Thanks David,
Jim |
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Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 03:19 PM |
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Joined: Jul 18, 2005
Posts: 62363
Location: (using avr-gcc in) Finchingfield, Essex, England
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You can generate a .eep in AS4/5 Asm just as easily:
Code:
.eseg
.db 1,2,3,4,5
Assemble that and it will generate a .eep file (intel hex by the way) that will load 1,2,3,4,5 into the first 5 EEPROM locations when you use ISP to program it.
If you have existing Asm code then just tag that onto the end and when you build you will get both a .hex as usual with the code and a .eep with those 5 bytes. Also, if you "start debugging" using either simulator or debug interface Studio will say "this project has EEPROM data do you want to load it now?" |
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Posted: Jan 28, 2012 - 03:44 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Hmmmmm
Cliff,
Can I do something like this?
Code:
.eseg
<NAME> .db 1,2,3,4,5,6,7,8,9,10
THEN,
In code issue an eeprom read starting at <NAME> and reading the ten bytes?
Jim |
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Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 03:49 PM |
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Joined: Jul 18, 2005
Posts: 62363
Location: (using avr-gcc in) Finchingfield, Essex, England
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yes, that's what you'd normally do. In fact you could do:
Code:
.cseg
EEPROM_read:
; Wait for completion of previous write
sbic EECR,EEWE
rjmp EEPROM_read
; Set up address (r18:r17) in address register
out EEARH, r18
out EEARL, r17
; Start eeprom read by writing EERE
sbi EECR,EERE
; Read data from data register
in r16,EEDR
ret
main:
ldi r17,low(bar)
ldi r18,high(bar)
call EEPROM_read
.eseg
foo: .db 37
bar: .db 51
(EEPROM code lifted from mega16 datasheet) |
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Posted: Jan 28, 2012 - 04:05 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Hmmmmmm again,
The prewrite is strictly a debugging need. THe final is a string that is stored at run time and really will never be changed.
Right now I want the eeprom to store the following:
Code:
.eseg
myname: .db j,g,m,d,e,s,i,g,n,s
Then in the code to read this into a SRAM location for use later on.
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 04:20 PM |
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Joined: Feb 12, 2005
Posts: 16329
Location: Wormshill, England
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Code:
.eseg
myname: .db j,g,m,d,e,s,i,g,n,s
Dependng on your assembler, you can use:
Code:
.eseg
myname: .db "jgmdesigns"
or
Code:
.eseg
myname: .db 'j','g','m','d','e','s','i','g','n','s'
You will write a subroutine that takes an eeprom address location as a parameter and returns the value.
You will have a corresponding one that writes a value to the location.
Write once. Document once. Use many times.
David. |
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Posted: Jan 28, 2012 - 05:44 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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David,
I am using studio 4's assembler. I only fired my code up the way I did to be quick. Bad move.
I was hoping to put this in:
Code:
.eseg
myname: .db "jgmdesigns"
It should work as I can do this in .cseg when I am doing an LMP instuction.
the proof in the pudding is to do it and see what happens
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 06:06 PM |
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Joined: Feb 12, 2005
Posts: 16329
Location: Wormshill, England
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Cliff has given you an example subroutine.
Neither he nor I have any idea of your coding style. So we do not know whether you pass subroutine parameters on the stack, in registers, in sandwiches, ...
And which registers you may use or trash.
The basic principles are exactly the same whatever language you use. The details are up to you. e.g.
1. read the 'name' contents from the eeprom.
2. if it says "jgmdesigns" then virginal.
3. write your application data.
I thought that you used Bascom. They will already have the necessary functions for this, and your life would be simple.
Remember to tick the EESAVE checkbox.
David. |
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Posted: Jan 28, 2012 - 08:01 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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No problem David, I run EVERYTHING is Studio since it never makes mistakes
Here is what I threw together:
Code:
.include "m48pdef.inc"
.eseg
eserial: .db "jgmdesigns"
eaddr: .byte 1
.dseg
serial: .byte 10
addr: .byte 1
rxbuffer: .byte 13
.cseg
jym: rjmp jym
It assembled just fine, but when I fired up the simulator and single stepped it twice, the EEPROM watch window shows it blank. I would have figured even with the code so simple it would have loaded the eeprom with jgmdesigns, but nope.
Will look into this some more. That should have worked in my book no? |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 08:09 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Figured it out
Had to load the eeprom from file after starting the debugger/simulator.
Makes sense.
Gonna work on this some more later....Right now the little one wants to play
Thanks guys
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 28, 2012 - 09:53 PM |
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Joined: Mar 28, 2001
Posts: 20392
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Quote:
Had to load the eeprom from file after starting the debugger/simulator.
... with "up\download file". |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jan 28, 2012 - 10:56 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Quote:
... with "up\download file".
Yeah I took my own, as well as the common advice given around here....RTFM
Jim
EDIT: THe funky part is that when you do the upload/download an error/warning that the size of the file is to big for the eeprom. It then cuts the file down to the size of the bytes I want loaded. If you don't know to kinda ignore the notice it could throw you off. Just an observation |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 29, 2012 - 12:07 AM |
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Joined: Jan 29, 2012
Posts: 1
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Thank you for this article. That’s all I can say. You most definitely have made this post into something special. You clearly know what you are doing, you’ve covered so many bases.Thanks!
The operatorคาสิโนà¸à¸à¸™à¹„ลน์ around the world will work to establish the Union คาสิโนà¸à¸à¸™à¹„ลน์, the world soon. We are looking for members |
Last edited by khemchicken on Jan 31, 2012 - 12:38 PM; edited 1 time in total
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Posted: Jan 29, 2012 - 01:25 AM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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On behalf of the other juvenile delinquents who have posted above
THANK YOU!!
Quote:
You most definitely have made this post into something special.
Hey guys, we need to frame this on the home page! 
JIm
P.S. Khemchicken, WELCOME ABOARD
ok,
As it turns out loading the eeprom helped make sure other parts of the code behaved without having to setup the dragon, wire a breadboard etc. Good to know. Iusually plod through with wiring up the dragon and a breadboard. THis way saves the hassle. Lets you check behaivior before wiring it all up and then roll the dice.
Learn sumtin' new every day |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 29, 2012 - 01:31 AM |
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Joined: Nov 02, 2009
Posts: 3239
Location: Zelenograd, Russia
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jgmdesign wrote:
On behalf of the other juvenile delinquents who have posted above
THANK YOU!!
Quote:
You most definitely have made this post into something special.
Hey guys, we need to frame this on the home page!
JIm
P.S. Khemchicken, WELCOME ABOARD
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Posted: Jan 29, 2012 - 02:04 AM |
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Joined: Mar 28, 2001
Posts: 20392
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Quote:
talking to a spam bot
I was about to delete the post as it smells spammish, but there isn't any links or anything else harmful. So in the spirit of "Perestroika" I'm givng it the benefit of the doubt. |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jan 29, 2012 - 03:45 AM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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@MBedder....
I LOVE spam....It tastes great on a saltine.
I had a feeling the post was not on the up and up, but since Cliff lashed out at everyone about being jerks at noob posts I decided to give the benefit of the doubt...just not too seriously...THat's why I put the following in a quote
Quote:
Quote:
You most definitely have made this post into something special.
Hey guys, we need to frame this on the home page!
At least my P.S was ot bullcrap.
Oh well, mother was right...cannot please anyone these days
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 29, 2012 - 12:41 PM |
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Joined: Jul 18, 2005
Posts: 62363
Location: (using avr-gcc in) Finchingfield, Essex, England
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It's spam - I imagine it was supposed to be signature spam but the bozo forgot to turn it on.
(actually it could be cleverer than that - he has no current signature assigned, so he posts a few of these seemingly innocuous posts then later comes back and sets a URL into the signature in his profile) |
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Posted: Jan 29, 2012 - 08:55 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Ok then, back to the topic....sort of
I put this into my equates section:
Code:
.equ rst ="R"
The intent is that when the m48 sees the ascii number for the letter R come in on the uart it knows what to do. I personally don't want to have to keep looking up ascii codes
Thought this would have worked like the eeprom load but nope. tried a few variations with no luck
jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 29, 2012 - 09:05 PM |
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Joined: Jul 18, 2005
Posts: 62363
Location: (using avr-gcc in) Finchingfield, Essex, England
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| 'R' not "R" surely? |
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Posted: Jan 29, 2012 - 09:24 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Yes I did write "R" as I was going off the .db"JGMDESIGNS" convention earlier discussed. Figured the "" would denote ascii not ''
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 29, 2012 - 09:57 PM |
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Joined: Mar 28, 2001
Posts: 20392
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Single character=single '
More than 1 character or string = double "
..as Cliff pointed out. |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jan 29, 2012 - 10:24 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Quote:
..as Cliff pointed out.
Did not quite see Cliffs point intill you "POINTED" it out
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 30, 2012 - 10:06 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Well things are getting to the end. I cpoied the write and read routines out of the datasheet to load the eeprom, and then tou read it back and output it to the terminal program, but no good:
Code:
Write_eeprom:
ldi ZH,high(wait*2) ;Inform operator to wait for eeprom write
ldi ZL,low(wait*2)
rcall messsend
;write 10digit unique ID to eeprom
ldi XH,0x00 ;load eeprom pointer with eserial location
ldi XL,(eserial)
ldi YH,high(dserial) ;load sram pointer with dserial location
ldi YL,LOW(dserial)
EEPROM_write:
ld temp,Y+
; Wait for completion of previous write
sbic EECR,EEPE
rjmp EEPROM_write
; Set up address (xreg) in address register
sts EEARL, XL
; Write data (r16) to Data Register
sts EEDR,temp
; Write logical one to EEMPE
sbi EECR,EEMPE
; Start eeprom write by setting EEPE
sbi EECR,EEPE
cpi YL,0x0d ;last byte
breq ewrtdone
inc XL
rjmp EEPROM_write
ewrtdone:
ldi ZH,high(cmpltwr*2) ;Inform operator eeprom Write complete
ldi ZL,low(cmpltwr*2)
rcall messsend
;readback eeprom
ldi XL,(eserial)
EEPROM_read:
; Wait for completion of previous write
sbic EECR,EEPE
rjmp EEPROM_read
; Set up address (xreg) in address register
sts EEARL, XL
; Start eeprom read by writing EERE
sbi EECR,EERE
; Read data from Data Register
in temp,EEDR
rcall bytesend
cpi XL,0x0d
breq end
inc XL
rjmp eeprom_read
end: rjmp end
The terminal behaves like the avr is programming, bt when I ask it to read back no go. Tried to connect up the dragon to have a look inside but with the m48 in the stk500 it won't connect(yes I removed the reset jumper)
I am more interested in the eeprom than the dragon.
Any ideas?
Jim
Edit: I used "STS" aas opposed to "OUT" like in the example because the assembler spit up with an error. I have seen this before so I use STS instead. Works though |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 30, 2012 - 10:21 PM |
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Joined: Mar 28, 2001
Posts: 20392
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Code:
EEPROM_write:
ld temp,Y+
; Wait for completion of previous write
sbic EECR,EEPE
rjmp EEPROM_write
In the time one EEPROM byte is written (a few ms), Y will be pointing to outer space.
Maybe this will fix it, there maybe other stuff I can't see.
Code:
EEPROM_write:
ld temp,Y+
; Wait for completion of previous write
EEPROM_write_loop:
sbic EECR,EEPE
rjmp EEPROM_write_loop
edit
Quote:
I used "STS" aas opposed to "OUT"
Start using the AVR001 macros, it will select the correct instructions for you. |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
Last edited by js on Jan 30, 2012 - 10:29 PM; edited 1 time in total
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Posted: Jan 30, 2012 - 10:28 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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OHHHHHHHHHHHHHHHH FU#$% 
This is what happens when you stare at this crap too long!
Thanks King Samperi
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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Posted: Jan 30, 2012 - 10:32 PM |
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Joined: Apr 20, 2007
Posts: 6078
Location: Long Island New York
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Well, that was fixed, but when I read back I get <0>
gonna look for another mistake if anyone sees one I would appreciate a kick
Jim |
_________________
Jim
I have decided that I am no longer going to plan anything in advance. In a court of law this is called Pre-Meditated, and does not look good for the defense.....
Timer function not working properly? Check CLKDIV8 Fuse first
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