/**************************************************************************************
* ?2008 Microchip Technology Inc.
*
* FileName: Standard PWM.c
* Dependencies: Header (.h) files if applicable, see below
* Processor: dsPIC33FJ06GS202
* Compiler: MPLAB?C30 v3.02 or higher
* IDE: MPLAB?IDE v8.02 or later
* Hardware Dependencies: 16-Bit 28-Pin Starter Board
*
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* derivatives hereto. You may use this code, and any derivatives created by
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* proprietary products. Your acceptance and/or use of this code constitutes
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*
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*****************************************************************************
* Description: *
* This program illustrates the use of the PWM module in the standard mode.*
* PWM1H and PWM2H are configured to be digital outputs, and PWM1L and PWM2L *
* are selected as PWM outputs. *
* *
*****************************************************************************/
// #include "p33FJ06GS202.h"
#include <p33FJ128MC506A.h>
/* Configuration Bit Settings */
/* Internal FRC Oscillator */
_FOSCSEL(FNOSC_FRC)
/* Clock Switching is enabled and
** Fail Safe Clock Monitor is disabled
** OSC2 Pin Function: OSC2 is Clock Output
** Primary Oscillator Mode: Disabled */
_FOSC(FCKSM_CSECMD & OSCIOFNC_ON)
_FWDT(FWDTEN_OFF)
//_FPOR(FPWRT_PWR128 & BOREN_OFF)
_FICD(ICS_PGD2 & JTAGEN_OFF)
void init_PWM(void);
int main()
{
/* Configure Oscillator to operate the device at 40Mhz
Fosc= Fin*M/(N1*N2), Fcy=Fosc/2
Fosc= 7.37*(43)/(2*2)=80Mhz for Fosc, Fcy = 40Mhz */
/* Configure PLL prescaler, PLL postscaler, PLL divisor */
PLLFBD=41; /* M = PLLFBD + 2 */
CLKDIVbits.PLLPOST=0; /* N1 = 2 */
CLKDIVbits.PLLPRE=0; /* N2 = 2 */
__builtin_write_OSCCONH(0x01); /* New Oscillator FRC w/ PLL */
__builtin_write_OSCCONL(0x01); /* Enable Switch */
while(OSCCONbits.COSC != 0b001); /* Wait for new Oscillator to become FRC w/ PLL */
while(OSCCONbits.LOCK != 1); /* Wait for Pll to Lock */
/* Now setup the ADC and PWM clock for 120MHz
((FRC * 16) / APSTSCLR ) = (7.37 * 16) / 1 = ~ 120MHz*/
// !!!!!!
// ACLKCONbits.FRCSEL = 1; /* FRC provides input for Auxiliary PLL (x16) */
// ACLKCONbits.SELACLK = 1; /* Auxiliary Oscillator provides clock source for PWM & ADC */
// ACLKCONbits.APSTSCLR = 7; /* Divide Auxiliary clock by 1 */
// ACLKCONbits.ENAPLL = 1; /* Enable Auxiliary PLL */
// !!!!!
// while(ACLKCONbits.APLLCK != 1); /* Wait for Auxiliary PLL to Lock */
// !!!!!!!!!!
TRISBbits.TRISB4 = 0; /* Set as a digital output */
TRISBbits.TRISB13 = 0; /* Set as a digital output */
// !!!!!!!!!!
LATBbits.LATB4 = 1;
LATBbits.LATB13 = 1;
init_PWM();
while(1); /* Infinite Loop */
}
void init_PWM()
{
PTPER = 2404; /* PTPER = ((1 / 400kHz) / 1.04ns) = 2404, where 400kHz
is the desired switching frequency and 1.04ns is PWM resolution. */
/*~~~~~~~~~~~~~~~~~~~~~~~ PWM1 Configuration ~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
PWM1CON1bits.PEN1H = 0; /* PWM1H is controlled by GPIO module */
PWM1CON1bits.PEN1L = 1; /* PWM1L is controlled by PWM module */
PWM1CON1bits.PMOD1 = 1; /* Select Independent Output PWM mode */
PDC1 = 640; /* Initial Duty cycle */
DTCON1 = 64; /* Deadtime setting */
// ALTDTR1 = 64; /* Deadtime setting */
// PHASE1 = 0; /* No phase shift */
/*~~~~~~~~~~~~~~~~~~~~~~~ PWM2 Configuration ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
PWM1CON1bits.PEN2H = 0; /* PWM2H is controlled by GPIO module */
PWM1CON1bits.PEN2L = 1; /* PWM2L is controlled by PWM module */
PWM1CON1bits.PMOD2 = 1; /* Select Independent Output PWM mode */
PDC2 = 640; /* Initial Duty cycle */
DTCON2 = 64; /* Deadtime setting */
// ALTDTR2 = 64; /* Deadtime setting */
// PHASE2 = 240; /* approximately 250ns phase shift */
FLTACON = 0; // PWM????FLTA??
FLTBCON = 0; // PWM????FLTA??
PTCONbits.PTEN = 1; /* Enable the PWM Module */
P1TCON = 0; // Enable PWM for center aligned operation ??????????????????????
}