Fire Alarm Code Help

[CoolStuffZone]

Need help with the following Homework assignment…

Design a fire alarm system using a 8051 microcontroller. The specs are as follows:

A) If the alarm is detected (one of the switches is activated) it should start flashing 4 LEDS (4 on the right (LEDS 1-4) and 4 on the left (LEDS 5-, alternating).

If the alarm is not detected, the display should show only 2 middle LEDS (LEDS 4 & 5) steadily ON (not flashing) indicating NORMAL operation.

This is the code I’ve come up with so far, but I appear to be stuck. I would appreciate any assistance. Thank you.

Code…

ORG 0H                                

                MOV A, #0                          

                MOV P2, A         

                MOV A, #OFFH 

                MOV P1, A

               

INPUT:  MOV A, P1         

               

HERE:    JNB A, HERE       

                MOV P2, #1        

 

DELAY:

                MOV R3, #15     

OUTER:

                MOV R2, #240   

INNER:

                DJNZ R2, INNER               

                DJNZ R3, OUTER               

                RET

               

SDELAY:

                MOV R5, #45     

H3:         MOV R4, #242

H2:         MOV R3, #255   

H1:         DJNZ R3, H1

                DJNZ R4, H2

                DJNZ R5, H3

                RET

END

[Ashutosh Bhatt]

there are too many mistakes in your program. like u hv written sunroutines for delay but in ur program there is no CALL instructions

u must first learn assembley language programming.

[Author]

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