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AVR LED Blink

Today is September 3, 2010 AVR

Usually the first program with any new microcontroller is to blink LED on port. Here is a small program that will blink LED on PB3 (pin2) of ATTiny11 AVR.

Hex File

:020000020000FC
:1000000008E007BB08E008BB04D000E008BB01D053
:10001000F9CFDFE0E7E3F9ECFA95F1F7EA95D9F7E4
:0C002000DA95C1F7D1E0DA95F1F7089508
:00000001FF

Source

;
;LED Blink
;Author: Chetan Bhargava [KG6NFG]
;Assembler: AVR Studio 4
;Date: 7/14/04
;Notes:
;We will use ATTiny11-6PC with internal RC oscillator
;Connect LED on pin 2 (PB3) on tiny11

.device ATTiny11
.include "tn11def.inc"

.def Temp = R16

.org  0x0000

init:
    ldi temp, 0b001000      ; Make pin PB3 output
    out DDRB, temp          ;

        
main:
    ldi temp, 0b01000       ; 
    out portb, temp         ; Turn off LED @ PB3

    rcall delay             ; wait for human eye to see LED toggle

    ldi temp, 0x00          ;
    out portb, temp         ; Turn on LED @ PB3

    rcall delay             ; wait for human eye to see LED toggle

    rjmp main               ; repaet until eternity or power removed :-)


delay:                      ; provides some delay so that the LED is visible
; ============================= 
;    delay loop  
;     499998 cycles: about 1/2 seconds
; ----------------------------- 
; delaying 499995 cycles:
          ldi  R29, $0F
WGLOOP0:  ldi  R30, $37
WGLOOP1:  ldi  R31, $C9
WGLOOP2:  dec  R31
          brne WGLOOP2
          dec  R30
          brne WGLOOP1
          dec  R29
          brne WGLOOP0
; ----------------------------- 
; delaying 3 cycles:
          ldi  R29, $01
WGLOOP3:  dec  R29
          brne WGLOOP3
; ============================= 
ret

Last modified: July 17 2009 13:37:51.

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