Lights up the leds

Led/152120201044.asm

@@ -0,0 +1,185 @@
+    LIST 	P=16F877A
+    INCLUDE	P16F877.INC
+    __CONFIG _CP_OFF &_WDT_OFF & _BODEN_ON & _PWRTE_ON & _XT_OSC & _WRT_ENABLE_OFF & _LVP_OFF & _DEBUG_OFF & _CPD_OFF
+    radix	dec
+
+    ; Reset vector
+    org 0x00
+    ; ---------- Initialization ---------------------------------
+    BSF     STATUS, RP0	; Select Bank1
+    CLRF    TRISB	; Set all pins of PORTB as output
+    CLRF    TRISD	; Set all pins of PORTD as output
+    BCF     STATUS, RP0	; Select Bank0    
+    CLRF    PORTB	; Turn off all LEDs connected to PORTB
+    CLRF    PORTD	; Turn off all LEDs connected to PORTD
+    
+    
+   
+    ; ---------- Your code starts here --------------------------
+    
+    
+    
+    ; If you want to change the delay you must go to the row """120"""
+    
+    Move_left	EQU	0x20
+    Move_right	EQU	0x21
+    dir		EQU     0x22
+    count       EQU     0x23
+    val         EQU     0x24
+	 
+
+    CLRF  TRISD
+    CLRF  TRISB
+    CLRF  PORTB
+	
+    MOVLW   0
+    MOVWF   Move_left
+    
+    MOVLW   1
+    MOVWF   Move_right
+    
+    MOVF    Move_left,W
+    MOVWF   dir
+    
+    MOVLW   0x1
+    MOVWF   val
+    
+    MOVLW   0
+    MOVWF   count
+	
+    CALL SELECTDELAY
+   
+   
+begin:
+    MOVF    val,W
+    MOVWF   PORTD
+    CALL    SELECTDELAY
+    
+    INCF    count,F
+    
+    MOVLW   15
+    SUBWF   count,W
+    BTFSS   STATUS,Z
+    GOTO    not_15
+    
+    CLRF    PORTD	     ; PORTD=0: Turn off all LEDs
+    CALL    SELECTDELAY      ; Wait for -- sec
+
+    MOVLW   0xFF	     ; WREG = 0xFF
+    MOVWF   PORTD	     ; PORTD = WREG = 0xFF: Turn on all LEDs
+    CALL    SELECTDELAY      ; Wait for -- sec 
+    
+    CLRF    PORTD	     ; PORTD=0: Turn off all LEDs
+    CALL    SELECTDELAY      ; Wait for -- sec
+
+    MOVLW   0xFF	     ; WREG = 0xFF
+    MOVWF   PORTD	     ; PORTD = WREG = 0xFF: Turn on all LEDs
+    CALL    SELECTDELAY      ; Wait for -- sec 
+    
+    CLRF    PORTD	     ; PORTD=0: Turn off all LEDs
+    CALL    SELECTDELAY      ; Wait for -- sec
+    
+    MOVLW   0x1
+    MOVWF   val
+    
+    MOVLW   0
+    MOVWF   count
+    
+    MOVF    Move_left,W
+    MOVWF   dir
+    GOTO    begin
+    
+not_15:
+    
+    MOVLW 0x80
+    SUBWF val, W
+    BTFSS STATUS, Z
+    GOTO not_80
+    
+    MOVF Move_right,W
+    MOVWF dir
+    
+not_80:
+    
+    MOVF Move_left, W
+    SUBWF dir, W
+    BTFSS STATUS, Z
+    GOTO not_equal
+    
+    BCF STATUS, C
+    RLF val, F      ; val = val << 1
+    GOTO begin
+    
+not_equal:
+    
+    BCF STATUS, C
+    RRF val, F      ; val = val >> 1
+    GOTO begin
+       
+
+SELECTDELAY:
+    
+    CALL DELAY250
+    ;CALL DELAY500
+    RETURN
+
+   
+DELAY250:
+    
+    i	EQU	    0x70		    ; Use memory slot 0x70
+    j	EQU	    0x71		    ; Use memory slot 0x71
+    
+    MOVLW	    d'250'		    ; 
+    MOVWF	    i			    ; i = 250
+
+    Delay250ms_OuterLoop
+    MOVLW	    d'250'
+    MOVWF	    j			    ; j = 250
+
+    Delay250ms_InnerLoop	
+    NOP
+    DECFSZ	    j, F		    ; j--
+    GOTO	    Delay250ms_InnerLoop
+
+    DECFSZ	    i, F		    ; i?
+    GOTO	    Delay250ms_OuterLoop    
+    RETURN
+	    
+	   
+DELAY500:
+    
+    i	EQU	    0x70
+    j	EQU	    0x71
+    k	EQU	    0x72
+    
+    MOVLW	    d'2'
+    MOVWF	    i			    ; i = 2
+   
+    Delay500ms_Loop1_Begin
+    MOVLW	    d'250'
+    MOVWF	    j			    ; j = 250
+    
+    Delay500ms_Loop2_Begin	
+    MOVLW	    d'250'
+    MOVWF	    k			    ; k = 250
+    
+    Delay500ms_Loop3_Begin	
+    NOP					    ; Do nothing
+    DECFSZ	    k, F		    ; k--
+    GOTO	    Delay500ms_Loop3_Begin
+
+    DECFSZ	    j, F		    ; j--
+    GOTO	    Delay500ms_Loop2_Begin
+
+    DECFSZ	    i, F		    ; i?
+    GOTO	    Delay500ms_Loop1_Begin    
+    RETURN
+    
+
+EndOf:
+    
+    ; ---------- Your code ends here ----------------------------    
+    MOVWF   PORTD    	; Send the result stored in WREG to PORTD to display it on the LEDs
+    
+LOOP    GOTO    $	; Infinite loop
+    END