///P2 0 Control frequency 10HZ to 50HZ,? News changes

//P2 1 controls account for 10% to 90%, depending on the change.

//Suppose the crystal oscillator is 12MHz?

# include & ltreg52.h & gt

# Definition? uint？ Not signed? Internationalorganizations (same as international organizations)

# Definition? Ucal? Not signed? tea

uint？ t=0，f= 100，w = 50

sbit？ p 10=p 1^0； ? //? output terminal

sbit？ kf=p2^0； ? //? Change frequency button

sbit？ kw=p2^ 1； ? //? Change width button

Invalid? Initialize ()

{

TMOD = 0x 2 1；

TH0 =(65536- 1000)/256；

TL0 =(65536- 1000)% 256；

ET0 = 1；

TR0 = 1；

EA = 1；

}

Invalid? time0()？ Interrupt? 1

{

TH0 =(65536- 1000)/256；

TL0 =(65536- 1000)% 256；

t++； //t is1ms.

if(t & gt； =f)？ t = 0；

}

Invalid? Master ()

{

init()；

while( 1)

{

What if (KF==0)? //Change the frequency

{ f = f- 10；

if(f & lt； = 10)? f = 100；

while(KF = = 0)；

w = f/ 10；

}

if(KW==0)？ //Change the proportion

{ w = w+f/ 10；

What if (w & gt=f)? w = f/ 10；

while(KW = = 0)；

}

if(t & lt； w)p 10 = 1； ? //single cycle

Or what? p 10 = 0；

}

}

If you can't see the picture clearly, please "view the big picture" first, and then save it to your computer to view the big picture.

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Back-up: According to your "problem-up", you need to add an AD converter. Commonly used parallel port has ADC0809, and serial port has ADC0834. Single-chip microcomputer scans the data output from AD conversion and sends it to the above two variables: frequency f and ratio w, which you can change. The amplitude change is very simple, just use the partial voltage output of potentiometer directly. It takes a certain length to write a complete story, which provides you with ideas. I hope you can use the computer more and get satisfactory results.