002.asm


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; ******************************************************

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; BASIC .ASM template file for AVR

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; ******************************************************

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.include "D:\PROGRA~3\VMLAB\include\m8def.inc"

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; Define here the variables

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;

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.equ CLOCK = 14745600

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.equ BAUD = 9600

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.equ UBRRVAL = CLOCK/(BAUD*16)-1

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.equ INTERVAL = 0.25

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.equ PRESCALER = 1024

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.equ OCVAL = (INTERVAL*CLOCK)/PRESCALER

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.def temp = r16

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.def sumH = r25

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.def sumL = r24

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; Define here Reset and interrupt vectors, if any

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.org 0x000                    ; kommt ganz an den Anfang des Speichers

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         rjmp start           ; Interruptvektoren überspringen

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                              ; und zum Hauptprogramm

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      reti      ; IRQ0 Handler

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      reti      ; IRQ1 Handler

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      reti

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      reti

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      reti      ; Timer1 Capture Handler

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      rjmp TIM1_COMPA  ; Timer1 CompareA Handler

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      reti      ; Timer1 CompareB Handler

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      reti      ; Timer1 Overflow Handler

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      reti      ; Timer0 Overflow Handler

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      reti      ; SPI Transfer Complete Handler

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      reti      ; USART RX Complete Handler      

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      reti      ; UDR Empty Handler

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      reti      ; USART TX Complete Handler

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      reti      ; ADC Conversion Complete Interrupt Handler

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      reti      ; EEPROM Ready Handler

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      reti      ; Analog Comparator Handler

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      reti      ; Two-wire Serial Interface Handler

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      reti      ; Store Program Memory Ready Handler

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start:

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  ; stack

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  ldi temp, LOW(RAMEND)

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  out SPL, temp

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  ldi temp, HIGH(RAMEND)

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  out SPH, temp

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  ldi temp, 0xFF

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  out DDRD, temp

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  ldi temp, 0xFF

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  out PORTD, temp

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  ;output compare werte

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  ldi temp, HIGH(OCVAL)

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  out OCR1AH, temp

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  ldi temp, LOW(OCVAL)

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  out OCR1AL, temp

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  ; ctc und prescaler

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  ldi temp, 0b00000000

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  out TCCR1A, temp

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  ldi temp, 0b00001101

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  out TCCR1B, temp

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  ; timer interrups

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  ldi temp, 0b00010000

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  out TIMSK, temp

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  ; baudrate

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  ldi temp, LOW(UBRRVAL)

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  out UBRRL, temp

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  ldi temp, HIGH(UBRRVAL)

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  out UBRRH, temp

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  ; frameformat

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  ldi temp, (1<<URSEL)|(3<<UCSZ0)

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  out UCSRC, temp

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  ; tx aktivieren

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  sbi UCSRB,TXEN

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  sei

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loop:

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  rjmp loop

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serout:

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  sbis UCSRA,UDRE

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  rjmp serout      ; Warten

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  out UDR, temp

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  ret

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TIM1_COMPA:

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  push temp

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  ;adiw sumH:sumL, 1

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  ;mov temp, sumH

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  ;rcall serout

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  ;mov temp, sumL

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  ;rcall serout

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  ldi temp, 'a'

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  rcall serout

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  ldi temp, 10

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  rcall serout

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  ldi temp, 13

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  rcall serout  

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  pop temp

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  reti