Sound/Sound2 with no delay

[fgcity]

Hi everyone.

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I have a Buzzer connected to a CCP2 pin on a PIC.

Currently i am using a standard "Sound" command to make it speak. But my problem is that the main program pauses every time a sound is made.

Can i generate the same sound by using hardware features of the Controller? Something like HPWM ?

[ElektroArt]

Of course, hpwm very good for sound generation. But depends on sound content.

if you want to play human voices, you need least 7-8kbytes per second

Or you need simple alarm siren sound simple loop enough

[fgcity]

I am generating just an alarm so its a simple Loop. Thank you for the advice. I appreciate it.

[Tim]

1 look up the peek freq sound output
2 Use on of the tools around to work out the PWM settings for that freq I have used this site http://www.micro-examples.com/public/microex-navig/doc/097-pwm-calculator.html
3 Select another freq with a good amplitude for the device
4 toggle the freq as desired to get a 2 tone effect

[fgcity]

Tnx Tim. Appreciate the info.

[fgcity]

My Buzzer is connected to CCP4 on the 18F8722 PIC at 40 MHz

As i understand, HPWM does not support Channels 3 - 5 so i must enter the registers manually. I have checked the calculator and it was very useful however, i was using the "Sound" command and was producing several sound to create a tone.

Is is possible for someone to help out with the formula on calculating the actual PR4 and CCPR4L values? My current configuration is as follows:

 'CCP4 PWM (Buzzer) Declares
            Dim CCP4_Duty As byte 
            symbol CCP4_Period = PR4 
                CCP4_Duty = 124
                CCPR4l = CCP4_Duty
                ccp4_period = 62
            clear trisg.3
            CCP4CON = %00011100                 'Set CCP4 for PWM Mode           
            T3CON.6 = 1                         'Timer3 and Timer4 are the clock sources for ECCP1, ECCP2, ECCP3, CCP4 and CCP5
            T3CON.3 = 1
            t3con.0 = 1
            T4CON = %00000111                   'Timer4 Prescaler 1:16, Timer ON

For example i have the following command:

Sound Buzzer, [100,10,120,10]

Based on the Calculator the values for tone "120" (Approx 9000 - 8000KHz) the values would be :

PR4: 68
CCPR4L & 2 bits from CCP4CON : 10001001 (137)

But what formula is used to calculate these values?