#include <libpic30.h>
#include <p30f4011.h>

// Configuration settings
_FOSC(CSW_FSCM_OFF & FRC_PLL16);  // Fosc=3D16x7.5MHz, Fcy=3D30MHz
_FWDT(WDT_OFF);                   // Watchdog timer off
_FBORPOR(MCLR_DIS);               // Disable reset pin

// Function prototypes
void configure_pins();
unsigned int read_analog_channel(int n);

int main()
{
	int voltage;

	// Set up which pins are which
	configure_pins();

	while(1)
	{
		// Analog input 0 controls PWM 1 duty cycle.
		voltage =3D read_analog_channel(0);
		PDC1 =3D (int)((voltage / 1023.0) * 2 * PTPER);

	}

	return 0;
}

void configure_pins()
{
	// Configure RD0 as a digital output
	LATD =3D 0;
	TRISD =3D 0b11111110;

	// Configure analog inputs
	TRISB =3D 0x01FF;      // Port B all inputs
	ADPCFG =3D 0xFF00;     // Lowest 8 PORTB pins are analog inputs
	ADCON1 =3D 0;          // Manually clear SAMP to end sampling, start
conversion
	ADCON2 =3D 0;          // Voltage reference from AVDD and AVSS
	ADCON3 =3D 0x0005;     // Manual Sample, ADCS=3D5 -> Tad =3D 3*Tcy =3D 0.1=
us
	ADCON1bits.ADON =3D 1; // Turn ADC ON

	// Configure PWM for free running mode
	// PWM period =3D Tcy * prescale * PTPER =3D 0.33ns * 64 * 9470 =3D 20ms
	PWMCON1 =3D 0x00FF; // Enable all PWM pairs in complementary mode
	PTCON =3D 0;
	_PTCKPS =3D 3;      // prescale=3D1:64 (0=3D1:1, 1=3D1:4, 2=3D1:16, 3=3D1:=
64)
	PTPER =3D 9470;     // 20ms PWM period (15-bit period value)
	PDC1 =3D 0;         // 0% duty cycle on channel 1 (max is 65536)
	PTMR =3D 0;         // Clear 15-bit PWM timer counter
	_PTEN =3D 1;        // Enable PWM time base
}

// This function reads a single sample from the specified
// analog input. It should take less than 2.5us if the chip
// is running at about 30 MIPS.
unsigned int read_analog_channel(int channel)
{
	ADCHS =3D channel;          // Select the requested channel
	ADCON1bits.SAMP =3D 1;      // start sampling
	__delay32(30);            // 1us delay @ 30 MIPS
	ADCON1bits.SAMP =3D 0;      // start Converting
	while (!ADCON1bits.DONE); // Should take 12 * Tad =3D 1.2us
	return ADCBUF0;
}




I have got this code from one of my friend...
I have made some changes and it actually works fine but the Problem is=20
I m confused with some macros'
as I m going to drive my mosfet with this code.
I want get freq of 80K so I can drive my Mosfet
 PWM time should be 1/f=3D0.0125 ms
I tried changing my PTPER but its still doesnt give me 80K frequency
what else should I update inorder to get a freq of 80K

and if I wanted to set Duty cycle on PDC1 to 50% what should the number to
put in the line below
PDC1 =3D 0;         // 0% duty cycle on channel 1 (max is 65536)


Please help!!
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