Here is a Christmas Light Flasher!
I blew up the controller for a battery operated LED based christmas lights, so here is a really simple flasher to replace the controller.
The code for the flasher is found in st.zip. The LEDs at the top of this page are flashed by some JavaScript in a similar way that the PIC chip flashes them.
;********************************************************************** ; * ; Filename: st001.asm - christmas LED flasher * ; Date: 14/12/2002 * ; File Version: * ; * ; Author: Doug Rice * ; * ;********************************************************************** ; * ; Files required: * ; * ;********************************************************************** ; * ; Notes: * ; * ;********************************************************************** list p=16F84 ; list directive to define processor #include <p16F84.inc> ; processor specific variable definitions __CONFIG _CP_OFF & _WDT_OFF & _PWRTE_ON & _RC_OSC ; '__CONFIG' directive is used to embed configuration data within .asm file. ; The lables following the directive are located in the respective .inc file. ; See respective data sheet for additional information on configuration word. ;********************************************************************** ORG 0x000 ; processor reset vector goto main ; go to beginning of program ORG 0x004 ; interrupt vector location cblock 0x0c countL ; counter used for a delay ptr ; pointer into the data endc main ; remaining code goes here ; define bit in Port B r equ 4 y equ 2 g equ 1 clrf PORTB clrf ptr loop1 CALL nextSample ; Now turn on the LED's by making the PORTB pins Outputs xorlw 0xff TRIS PORTB ; Force any outputs low movlw 0 movwf PORTB ; delay call delay1 ; Turn off all the LEDS movlw 0xFF TRIS PORTB movlw 0 movwf PORTB ; delay for two delays call delay1 call delay1 ; loop around goto loop1 delay ; delay the code ; return movlw 25 movwf countL delay1 decfsz countL,f goto delay1 return nextSample ; This uses a table read. ; no attempt is made to check if PCLATH is correctly set. ; incfsz ptr,f nop movfw ptr ; limit the index to 64 bytes andlw 0x3F addwf PCL,F table RETLW 0 RETLW 0 RETLW r RETLW y RETLW g RETLW r RETLW y RETLW g RETLW r RETLW y RETLW g RETLW r RETLW y RETLW g RETLW r RETLW y RETLW g RETLW r RETLW y RETLW g RETLW r RETLW y RETLW g RETLW 0 RETLW 0 RETLW r RETLW r RETLW y RETLW y RETLW g RETLW g RETLW 0 RETLW 0 RETLW r RETLW r RETLW y RETLW y RETLW g RETLW g RETLW 0 RETLW 0 RETLW r RETLW r RETLW y RETLW y RETLW g RETLW g RETLW 0 RETLW 0 RETLW r RETLW r RETLW y RETLW y RETLW g ; at the end zero ptr and return a value to loop around again. clrf ptr RETLW g clrf ptr END ; directive 'end of program'
Updated by Doug Rice,
