Beep buzzer twice

[adrianvon]

Hi all,

I connected a buzzer to a PIC microcontroller. Now i want to make it beep for approx 3sec, stop for 3 sec and then beep again for 3sec.

Now my problem is that when i decrement three registers, the buzzer is beeping for approx 12sec and when i decrement two registers the buzzer is beeping for approx 0.1sec. How can i make it beep for approx 3 sec??

Below is the coding that i am using:

BUZZER_UP
CLRF REG2
CLRF REG3
CLRF REG4
BSF PORTC,2
LINE1_BUZZER_UP
DECFSZ REG2
BRA LINE1_BUZZER_UP
DECFSZ REG3
BRA LINE1_BUZZER_UP
DECFSZ REG4
BRA LINE1_BUZZER_UP
BCF PORTC,2
CLRF REG2
CLRF REG3
CLRF REG4
LINE2_BUZZER_UP
DECFSZ REG2
BRA LINE2_BUZZER_UP
DECFSZ REG3
BRA LINE2_BUZZER_UP
DECFSZ REG4
BRA LINE2_BUZZER_UP
BSF PORTC,2
CLRF REG2
CLRF REG3
CLRF REG4
LINE3_BUZZER_UP
DECFSZ REG2
BRA LINE3_BUZZER_UP
DECFSZ REG3
BRA LINE3_BUZZER_UP
DECFSZ REG4
BRA LINE3_BUZZER_UP
BCF PORTC,2
GOTO LINE1_LOW_TEMP

Thanks is advance.

 

[Gobbledok]

Instead of clearing the registers, place values in them.

If you reduce reg4 to a 1/4 of what it is (64 for an 8-bit PIC; 16384 for a 16-bit PIC), you will get a quarter of your current delay.

So replace 'CLRF REG4' with:

MOVLW 16384
MOVWF REG4

and that should give you a quarter of your current delay.

 

[adrianvon]

Thanks for your reply Gobbledok. Its working fine now