AVR-Chat

OK.    I figured out wqhat up/downloading memory was in AVR Studio. Now, 
I can see my EEPROM data when I do a memory watch.  It still isn't 
coming in to my data resgister when I read it, though )-:.

On 1/3/07, Thomas Keller <tjkeller1@alltel.net> wrote:
>
>
> OK.    I figured out wqhat up/downloading memory was in AVR Studio. Now,
> I can see my EEPROM data when I do a memory watch.  It still isn't
> coming in to my data resgister when I read it, though )-:.


Step it through, and see what it IS loading.
Check EEARL and EEARH just before the load.


[Non-text portions of this message have been removed]

I have taken the liberty to rearrange your code to my
liking :) this will fetch the last data byte correctly.
Also watch out your use of r16 as it is also defined as temp.

.include "tn25def.inc"

  ; Define here the variables
  ;
  .def  temp  =r16

.cseg

  ; Define here Reset and interrupt vectors, if any
  ;
  RESET:
     rjmp 	 START
     reti      ; Addr $01
     reti      ; Addr $02
     reti      ; Addr $03
     reti      ; Addr $04
     reti      ; Addr $05
     reti      ; Addr $06        Use 'rjmp myVector'
     reti      ; Addr $07        to define a interrupt vector
     reti      ; Addr $08
     reti      ; Addr $09
     reti      ; Addr $0A
     reti      ; Addr $0B        This is just an example
     reti      ; Addr $0C        Not all MCUs have the same
     reti      ; Addr $0D        number of interrupt vectors
     reti      ; Addr $0E
     reti      ; Addr $0F
     reti      ; Addr $10


  ; Program starts here after Reset


START:
      ldi    r30,    RAMEND                    ; initialize stack pointer
      out    SPL,    r30

;****************
;    ldi    r31,    0x00	; set up EEPROM high byte address
;     out EEARH,    r31     Not used in tiny 45     ; store in register
;****************

      ldi    r31,    0x00                    ; set up upper WGM bytes
      out    WGM01,    r31                        ; and once again
      ldi    r31,    0x03                    ; set upo to set 
waveform configuration
      out    WGM00,    r31                        ; output to 
appropriate control register

  ;
  ;    set up timer delay for ~~.01 second
  ;
  ;    counter clock will be prescaled by 1024 to make the .01 second 
count easier
  ;

      ldi    r31,    0x38                    ;  load low byte of delay count
      out    TCNT0,    r31                        ; output to counter/timer 0-

      ldi    r31,    0xe5                    ; load the control value 
for  TCCR1
                                          ; CTC1 set, PWMa set, COM1A set to
                                          ; toggle on match, timer clock set
                                          ; for system clock divided by 256

      out    TCCR1,    r31                    `    ; store in register

      ldi    r31,    0x01                    ; load value for TCCR01A
      out    TCCR0A,    r31                    ; and strope to TCCR01A
      ldi    r31,    0x04                    ; load value for TTCCR01B
      out    TCCR0B,    r31                    ; output to TCCR01B

      ldi    r31,        0x00                ; load compre output macthj value
      out    OCR0A,        r31                    ; stroe in output 
compare register 0A


  ;
  ;    this code sets the default initial table adress at -1.  It 
will automatically
  ;    increment on the first access, to 0
  ;

      ldi    r16,table_end	;****** 0xff ;first addresss - 1 in EEPROM 
table data
      ldi r17,    0x00                    ; direction control byte, 0 = up

      rcall    TABLEDATA

      rjmp    DONE                        ; all done, leave
  ;
  ;    this subroutine counts up and down through the data table in the EEPROM
  ;    data, reading all 100 data values, from bottom to top, then 
top to bottom
  ;    one at a time
  ;

  NEXT:

      ldi    r30,    0x00                    ; compare value
      cp    r17,    r30                        ; check direction bit for value
      brne    UP                            ; it's set for an up count

      ldi    r30,    0x00                    ; compare value
      dec    r16                                ; count the table 
pointer down one
      cp    r16,    r30                        ; at the bottom yet?
      ldi    r17,    0xff                    ; set direction flag to count up
      RJMP    QUIT0                        ; all done, depart

  UP:
      ldi    r30,    0x63                    ; compare value
      inc    r16                                ; increment table pointer
      cp    r16,     r30                        ; 99 decimal, end of table
      breq    FIXIT0                        ; deal with table overflow
      rjmp    QUIT0                        ; all done, depart


  FIXIT0:

      ldi    r17,    0x00                    ; reset direction flag 
for  down count

  QUIT0:

      ret                                    ; return from subrouttine  call

  ;
  ;    read a value from the EEPROM table
  ;

  TABLEDATA:

	rcall    NEXT                        ; go grab next tabel address
     out    	EEARL,r16   ;Sets up address in EEP
     sbi   	EECR,EERE	;************* this is missing in your code
     in    	r0,EEDR   ;Get data
     ret                                 ; all done, go home

  DONE:
      rjmp DONE



  ;    this table povides the data for the intensity curve needed for
  ;    xxxxxxxxxxxxxxx.  the data represent the value sin^3 * 255 for
  ;    each angle from 0 through 90  at .9 degree increments

      .eseg

  TABLE:
      .db    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 3, 3, 4, 5, 6, 6
      .db    8, 9, 10, 11, 13, 14, 16, 18, 20, 22, 24, 26, 29, 31, 34, 36
      .db    39, 44, 48, 52, 55, 59, 62, 66, 70, 74, 78, 82, 86, 90, 94, 99
      .db    103, 108, 112, 117, 121, 126, 130, 135, 140, 144, 149, 153
      .db    158, 163, 167, 172, 176, 180, 185, 189, 193, 197, 201, 205
      .db    209, 212, 216, 219, 223, 226, 229, 232, 234, 237, 239, 242
      .db    344, 346, 247, 249, 250, 252, 253, 254, 255, 255, 255
table_end:

Regards

John Samperi

********************************************************
Ampertronics Pty. Ltd.
11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
Tel. (02) 9674-6495       Fax (02) 9674-8745
Email: john@ampertronics.com.au
Website  http://www.ampertronics.com.au
*Electronic Design * Custom Products * Contract Assembly
********************************************************

Dave, that's the point.  it doesn';t appear to be laoding ANYTHING.   I 
can use thw memory watch to look at the EEPROM contents, and they are 
correct (now that I know about "downloading" the eep file).  Buty 
according to the debugger, NOTHING is appearing in either EEDR *OR* the 
register into which I am loading the EEDR contents.  Always 0x00, 
regardless of what is in the EEPROM location being addressed by r16 
(which is being copied into the EEADRL register, and is showing up there 
correctly).

David VanHorn wrote:

>
> On 1/3/07, Thomas Keller <tjkeller1@alltel.net 
> <mailto:tjkeller1%40alltel.net>> wrote:
> >
> >
> > OK. I figured out wqhat up/downloading memory was in AVR Studio. Now,
> > I can see my EEPROM data when I do a memory watch. It still isn't
> > coming in to my data resgister when I read it, though )-:.
>
> Step it through, and see what it IS loading.
> Check EEARL and EEARH just before the load.
>
>

Thanks John!  That sbi instruction was the culprit.  I misunderstood, 
and thought that was only necessary if one was worried about the 4 clock 
cycle delay in reading EEPROM.   *sigh*

tom

John Samperi wrote:

>
> I have taken the liberty to rearrange your code to my
> liking :) this will fetch the last data byte correctly.
> Also watch out your use of r16 as it is also defined as temp.
>
>
> rcall NEXT ; go grab next tabel address
> out EEARL,r16 ;Sets up address in EEP
> sbi EECR,EERE ;************* this is missing in your code
> i
>

On 1/4/07, Thomas Keller <tjkeller1@alltel.net> wrote:
>
> Dave, that's the point.  it doesn';t appear to be laoding ANYTHING.   I
> can use thw memory watch to look at the EEPROM contents, and they are
> correct (now that I know about "downloading" the eep file).  Buty
> according to the debugger, NOTHING is appearing in either EEDR *OR* the
> register into which I am loading the EEDR contents.  Always 0x00,
> regardless of what is in the EEPROM location being addressed by r16
> (which is being copied into the EEADRL register, and is showing up there
> correctly).


 And I think you just found out why :)


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