copied template, changed formatting

2 years ago · c257d5f90b
parent 6c9816bea6
commit c257d5f90b
1 changed files with 78 additions and 0 deletions
--- a/src/main.asm
+++ b/src/main.asm
@ -0,0 +1,78 @@
+;**********************************************************************
+;                                                                     *
+;    Filename:	   main.asm                                           *
+;    Date:                                                            *
+;    File Version:                                                    *
+;                                                                     *
+;    Author:                                                          *
+;    Company:                                                         *
+;                                                                     *
+;                                                                     *
+;**********************************************************************
+;                                                                     *
+;    Files required:                                                  *
+;                                                                     *
+;                                                                     *
+;                                                                     *
+;**********************************************************************
+;                                                                     *
+;    Notes:                                                           *
+;                                                                     *
+;                                                                     *
+;                                                                     *
+;                                                                     *
+;**********************************************************************
+
+;; basic setup
+	list      p=16f676           ; list directive to define processor
+	#include <p16F676.inc>        ; processor specific variable definitions
+
+	errorlevel  -302              ; suppress message 302 from list file
+
+	__CONFIG   _CP_OFF & _CPD_OFF & _BODEN_OFF & _MCLRE_OFF & _WDT_OFF & _PWRTE_ON & _INTRC_OSC_NOCLKOUT 
+
+; '__CONFIG' directive is used to embed configuration word within .asm file.
+; The lables following the directive are located in the respective .inc file.
+; See data sheet for additional information on configuration word settings.
+
+w_temp        EQU     0x20        ; variable used for context saving 
+status_temp   EQU     0x21        ; variable used for context saving
+
+		ORG     0x000             ; processor reset vector
+		goto    main              ; go to beginning of program
+	
+
+		ORG     0x004             ; interrupt vector location
+		movwf   w_temp            ; save off current W register contents
+		movf	STATUS,w          ; move status register into W register
+		movwf	status_temp       ; save off contents of STATUS register
+
+; isr code can go here or be located as a call subroutine elsewhere
+
+		movf    status_temp,w     ; retrieve copy of STATUS register
+		movwf	STATUS            ; restore pre-isr STATUS register contents
+		swapf   w_temp,f
+		swapf   w_temp,w          ; restore pre-isr W register contents
+		retfie                    ; return from interrupt
+
+
+; these first 4 instructions are not required if the internal oscillator is not used
+main
+;		call    0x3FF             ; retrieve factory calibration value
+;		bsf     STATUS,RP0        ; set file register bank to 1 
+;		movwf   OSCCAL            ; update register with factory cal value 
+;		bcf     STATUS,RP0        ; set file register bank to 0
+
+
+;; remaining code goes here
+
+
+
+;; initialize eeprom locations
+
+		ORG	0x2100
+		DE	0x00, 0x01, 0x02, 0x03
+
+
+		END                       ; directive 'end of program'
+