Traffic light controller using PIC16f877a problem

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oday_albadarneh

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Dear all,
My friend have an assignment in the Micro-controllers course, he has to write an assembly code to control a traffic light using PIC16f877a attached to a 7-segment display s the following flow chart
View attachment flowchart.bmp

the circuit in Proteus is attached below
View attachment homework.BMP

I look for your help as soon as possible
 

Your schematic is wrong!!!

In the switches... look the example... disregard the crystal if using internal oscillator!!!

View attachment Semaforo.BMP

Asm tutorial : **broken link removed**

This is basic code: Follow your flow chart!!!
Code: 
;**********************************************************************
;   This file is a basic code template for assembly code generation   *
;   on the PIC16F877A. This file contains the basic code              *
;   building blocks to build upon.                                    *  
;                                                                     *
;   Refer to the MPASM User's Guide for additional information on     *
;   features of the assembler (Document DS33014).                     *
;                                                                     *
;   Refer to the respective PIC data sheet for additional             *
;   information on the instruction set.                               *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Filename:	    xxx.asm                                           *
;    Date:                                                            *
;    File Version:                                                    *
;                                                                     *
;    Author:                                                          *
;    Company:                                                         *
;                                                                     * 
;                                                                     *
;**********************************************************************
;                                                                     *
;    Files Required: P16F877A.INC                                     *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Notes:                                                           *
;                                                                     *
;**********************************************************************

	list		p=16f877A		; list directive to define processor
	#include	<p16f877A.inc>	; processor specific variable definitions
	
#DEFINE		BANK0	BCF		STATUS,RP0
#DEFINE		BANK1	BSF		STATUS,RP0
	
	__CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_OFF & _RC_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
	
	ERRORLEVEL  -302			; Eliminate bank warning
	
; '__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.

;***** VARIABLE DEFINITIONS
	CBLOCK	0x20
		W_TEMP					; variable used for context saving
		STATUS_TEMP				; variable used for context saving
		PCLATH_TEMP				; variable used for context saving	
		TEMP1					; For delay routine
		TEMP2					; For delay routine
		TEMP3					; For delay routine
		TEMP4					; For delay routine
	ENDC
;**********************************************************************
	ORG     0x000				; processor reset vector

	NOP			  				; nop required for icd
  	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
	MOVF	PCLATH,W			; move pclath register into w register
	MOVWF	PCLATH_TEMP			; save off contents of PCLATH register

; isr code can go here or be located as a call subroutine elsewhere

	MOVF	PCLATH_TEMP,W		; retrieve copy of PCLATH register
	MOVWF	PCLATH				; restore pre-isr PCLATH register contents
	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
;**********************************************************************
MAIN
	BANK0
	CLRF	PORTA
	CLRF	PORTB
	CLRF	PORTC
	CLRF	PORTD
	CLRF	PORTE
	BANK1
	;		  76543210	bit control
	MOVLW	B'00000000'			; All Output
	MOVWF	TRISA
	;		  76543210	
	MOVLW	B'00000011'			; B0 and B1 as Input the rest is Output
	MOVWF	TRISB
	;		  76543210	
	MOVLW	B'00000000'			; All Output
	MOVWF	TRISC
	;		  76543210	
	MOVLW	B'00000000'			; All Output
	MOVWF	TRISD
	;		  76543210	
	MOVLW	B'00000000'			; All Output
	MOVWF	TRISE
	;		  76543210	
	MOVLW	B'10000000'			; PORTB pull-ups are disabled
	MOVWF	INTCON
	BANK0	
;**********************************************************************
LOOPING
	;		  76543210	bit control
	MOVLW	B'00000000'			; 0 in BCD 
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000001'			; 1 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000010'			; 2 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000011'			; 3 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000100'			; 4 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000101'			; 5 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000110'			; 6 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000111'			; 7 in BCD
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00001000'			; 8 in BCD 
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00001001'			; 9 in BCD 
	MOVWF	PORTD
	CALL	DELAY100M			; Call 100m delay
	MOVLW	B'00000000'			; 0 in BCD 
	MOVWF	PORTD

	;		  76543210	bit control
	MOVLW	B'00000001'
	MOVWF	PORTA
	MOVLW	B'10000000'
	MOVWF	PORTB
	CALL	DELAY1S				; Call 1S delay
	MOVLW	B'00000010'
	MOVWF	PORTA
	MOVLW	B'01000000'
	MOVWF	PORTB
	CALL	DELAY1S				; Call 1S delay
	MOVLW	B'00000100'
	MOVWF	PORTA
	MOVLW	B'00100000'
	MOVWF	PORTB
	CALL	DELAY1S				; Call 1S delay
	MOVLW	B'00000000'
	MOVWF	PORTA
	MOVLW	B'00000000'
	MOVWF	PORTB
	CALL	DELAY1S				; Call 1S delay

	BTFSC	PORTB,0				; Read Key in PORTB RB0
	CALL	FUNCTIONA	
	CALL	FUNCTIONB

	BTFSC	PORTB,1				; Read Key in PORTB RB1
	CALL	FUNCTIONC	
	CALL	FUNCTIOND

	GOTO LOOPING
;**********************************************************************
FUNCTIONA						; Make here your code

	RETURN
;**********************************************************************
FUNCTIONB						; Make here your code

	RETURN
;**********************************************************************
FUNCTIONC						; Make here your code

	RETURN
;**********************************************************************
FUNCTIOND						; Make here your code

	RETURN
;**********************************************************************
; Delay 100 mili routine
DELAY100M
	MOVLW	0x1E
	MOVWF	TEMP1
	MOVLW	0x4F
	MOVWF	TEMP2
DELAYLOOP
	DECFSZ	TEMP1, F
	GOTO	$+2
	DECFSZ	TEMP2, F
	GOTO	DELAYLOOP
	GOTO	$+1
	NOP
	RETURN
;**********************************************************************
DELAY1S
	MOVLW	0X07
	MOVWF	TEMP1
	MOVLW	0X2F
	MOVWF	TEMP2
	MOVLW	0X03
	MOVWF	TEMP3
DELAY1SLOOP
	DECFSZ	TEMP1, F
	GOTO	$+2
	DECFSZ	TEMP2, F
	GOTO	$+2
	DECFSZ	TEMP3, F
	GOTO	DELAY1SLOOP
	GOTO	$+1
	GOTO	$+1
	GOTO	$+1
	RETURN	
;**********************************************************************
	END                       ; directive 'end of program'
;**********************************************************************
 

Attachments

  • Semaforo High.BMP
    4 MB · Views: 332
Last edited:

Dear
the circuit is given by the instructor, although i wrote the code in MikroC and it's running good, can i convert my code to assembly and use MBLAB ?!!

Here is the code
Code: 
int i;
char DSP_code1[10]= {0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00};
char DSP_code2[6] = {0x05,0x04,0x03,0x02,0x01,0x00};
void delay1 ()
{
 for(i=0; i<10; i++)
 {
    PORTD = DSP_code1[i];
    delay_ms(1500);
 }
}

void delay2 ()
{
 for(i=0; i<5; i++)
 {
    PORTD = DSP_code2[i];
    delay_ms(1000);
 }
}


void main()
{
TRISA = 0x00;
TRISB = 0x00;
TRISD = 0x00;

while (1)
{
 porta = 0x01;
 portb = 0x80;
 delay1();
 portb = 0xC0;
 delay2();
 porta = 0x04;
 portb = 0x20;
 delay1();
 porta = 0x06;
 delay2();
}
}

- - - Updated - - -

Dear
the circuit is given by the instructor, although i wrote the code in MikroC and it's running good, can i convert my code to assembly and use MBLAB ?!!

Here is the code
Code: 
int i;
char DSP_code1[10]= {0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00};
char DSP_code2[6] = {0x05,0x04,0x03,0x02,0x01,0x00};
void delay1 ()
{
 for(i=0; i<10; i++)
 {
    PORTD = DSP_code1[i];
    delay_ms(1500);
 }
}

void delay2 ()
{
 for(i=0; i<5; i++)
 {
    PORTD = DSP_code2[i];
    delay_ms(1000);
 }
}


void main()
{
TRISA = 0x00;
TRISB = 0x00;
TRISD = 0x00;

while (1)
{
 porta = 0x01;
 portb = 0x80;
 delay1();
 portb = 0xC0;
 delay2();
 porta = 0x04;
 portb = 0x20;
 delay1();
 porta = 0x06;
 delay2();
}
}
 

You can use the template for asm or use the .LST and .ASM (compiled by mikroC) file to make the .ASM for MPASM!!!

In folder C:\Program Files (x86)\Microchip\MPASM Suite\Template\Code\ or C:\Program Files\Microchip\MPASM Suite\Template\Code\

Search for 16F877ATEMP.ASM
 
Last edited:

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