AVR-Chat

Possible problem in EEread?



On 7/5/07, Thomas Keller <tjkeller1@alltel.net> wrote:
>
> Alright.   I am monitoring the control register (OCR0) and it is getting
> the appropriate values to cause the PWM unit to dim the LED, but the LED
> is staying brightly lit, at 100% all the time.   In the simulator, you
> cannot see the PWM output, but by watching the various registers, it
> appears to be working, except that on an actual AT90S8515, the LED never
> dims.   Am I missing something in the PWM setup?
>
> PWM initialization code
> ;-----------------------------------------------------------------------------
> ;    initialize counters, PWM module
> ;
>
>    ldi        TEMP,        0x03            ; enable timer and compare
> match register
>    out       TIMSK,      TEMP         ; and store to appropriate register
>    ldi        TEMP,        0x0d            ; set up timer prescaler
>    out        TCCR0,    TEMP          ; output to correct register
>
>
>
> PWM access code:
> ;-----------------------------------------------------------------------------
> ;    PWM interrupt handler
> ;
>
> PWM_Handler:
>
>    rcall    EERead                    ; go read the EEPROM data for
> this angle
>    out     OCR0,    TEMP        ; output to PWM controller
>    in        r27,    OCR0            ; take a peek at the PWM control
> register and siplay for debugging
>
>    ret                                        ; all done, go home
>
>
>
>
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