littletransistor
New Member
Hey there,
I've finally developed some tone-generating algorithm to have the loudspeaker squeeze out some music notes with a frequency and time period.
I got that time-period correct, but I don't know why I couldn't transfer a constant to the function.
Here's the code:
The problem is, I cannot put the value of the frequency into the Delay function (it's for the squarewave). I bold the instructions and the subroutines in red for clarity. I tried it many times, and it ended up without a sound at all. I believe that in C, there's something like "void function(int x, int y)" isn't it?
Almost got it working by a small inch, anything I've missed out there?
I've finally developed some tone-generating algorithm to have the loudspeaker squeeze out some music notes with a frequency and time period.
I got that time-period correct, but I don't know why I couldn't transfer a constant to the function.
Here's the code:
Code:
#include <p18F1320.inc>
CONFIG WDT=OFF; disable watchdog timer
CONFIG MCLRE = OFF; MCLEAR Pin off
CONFIG DEBUG = OFF; Enable Debug Mode
CONFIG LVP = OFF; Low-Voltage programming disabled (necessary for debugging)
CONFIG OSC = INTIO2;Internal oscillator, port function on RA6
CONFIG PWRT = ON
org 0; start code at 0
cblock 0x20
Delay1
Delay2
Delay1T
count1
count2
freq
duration
endc
[B][COLOR=Red]SND macro freq,duration
movlw freq
movwf Delay1
movlw duration
movwf count1
call Sound
endm[/COLOR][/B]
Start:
movlw b'01100000'
movwf OSCCON
clrf T0CON
movlw b'10000111'
movwf T0CON
clrf TRISA
clrf TRISB
clrf LATA
clrf LATB
clrf TMR0H
clrf TMR0L
; movlw .83
; movwf count1
main:
[B][COLOR=Red]SND .170, .83
SND .210, .83
SND .220, .83
SND .230, .83
SND .247, .83
SND .304, .83[/COLOR][/B]
goto $
Sound:
bcf INTCON, TMR0IF
movlw 0xFF
movwf TMR0H
movlw 0xF7
movwf TMR0L
sound1:
bsf LATA, 1
call Delay
bcf LATA, 1
call Delay
btfss INTCON,TMR0IF
goto sound1
decfsz count1,1
goto Sound
return
[B][COLOR=Red]Delay:
movwf Delay1
DelayLoop:
DECFSZ Delay1,f
GOTO DelayLoop
return[/COLOR][/B]
DelayT:
movff Delay1T,TMR0L
_DelayT:
clrf T0CON
movlw b'10000111'
movwf T0CON
bcf INTCON,TMR0IF
DelayL:
btfss INTCON,TMR0IF
goto DelayL
return
endAlmost got it working by a small inch, anything I've missed out there?
Last edited: