dsPIC33F之PWM interrupt

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//
//	File: main.c
//
//	Microcontroller: dsPIC33FJ64GS610
//	Compiler:        MPLAB XC16 v1.11
//	IDE:             MPLAB X IDE v1.70 
//
//
// NOTES:
// This code example shows the use of the Leading Edge Blanking (LEB) function
// to mask transients caused by High-Speed switching (MOSFETs/IGBTs)applications
// using remappable mapping.  The LEB function enables the user-assigned application
// to ignore the expected transients caused by the High-Speed switching that occurs
// near the edges of the PWM output signals.  This is done by using software to
// ignore current-limit and fault inputs for a period of 0 ns to 4251 ns in 8.32 ns
// increments following any specified rising or falling edge of the PWMxH and PWMxL
// signal.  In this particular code example, pin 68 (RD8) will be used as the fault 
// source signal to the PWM module. This fault signal will be ignored for a period 
// of time as stated in the LEB (LEBDLY3<11:3>) bits. After this period has elapsed, 
// PWM1H will be driven low. The fault signal will be triggered continuously every 
// fourth PWM1H cycle.
//
// ADDITIONAL NOTES:
// Code Tested on:
// Explorer16 Development Board - Device: dsPIC33FJ64GS610 (100-pin TQFP)
//
//
// PWM1H:  Pin 94
// PWM1L:  Pin 93
// Fault1: Pin 68 (RD8)
//
//************************************************************************


#include "p33Fxxxx.h"

//Macros for Configuration of Fuse Registers:
//Invoke macros to set up  device configuration fuse registers.
//The fuses will select the oscillator source, power-up timers, watch-dog
//timers etc. The macros are defined within the device header files.
//The configuration fuse registers reside in Flash memory.


// ISR declaration
void __attribute__((__interrupt__, no_auto_psv)) _PWM1Interrupt (void);

_FICD(JTAGEN_OFF & ICS_PGD1);     // Disable JTAG and Communicate on PGC1/EMUC1 and PGD1/EMUD1

// Internal FRC Oscillator
_FOSCSEL(FNOSC_FRC & IESO_ON);    // FRC Oscillator at start-up then switch to FRC with PLL
_FOSC(FCKSM_CSECMD & OSCIOFNC_OFF  & POSCMD_NONE);
			// Clock Switching is enabled and Fail Safe Clock Monitor is disabled
			// OSC2 Pin Function: OSC2 is Clock Output
			// Primary Oscillator Mode: Disabled
_FWDT(FWDTEN_OFF);         // Watchdog Timer disabled


int main(void)
{

///////////////////    SET UP SYSTEM CLOCKS    /////////////////////////////////////////
// Configure Oscillator to operate the device at 40Mhz (with FRC)
// Fosc = Fin*M/(N1*N2), Fcy = Fosc/2 = 80 MHz/2 = 40 MHz
// Fosc = 7.37M*43(2*2) = 80Mhz for 7.37 MHz input clock
 PLLFBD             = 41;    // M  = 43
 CLKDIVbits.PLLPOST = 0;     // N1 = 2
 CLKDIVbits.PLLPRE  = 0;     // N2 = 2
 CLKDIVbits.DOZE    = 0;     // Fcy = 40 MIPS


	// Initiate Clock Switch to Internal FRC with PLL (NOSC = 0b001)
	__builtin_write_OSCCONH(0x01);
	__builtin_write_OSCCONL(0x01);

	// Wait for Clock switch to occur
	while (OSCCONbits.NOSC != 0b001);

	/* --- Wait for PLL to lock --- */
	while (OSCCONbits.LOCK != 1) {};

// Configure Auxillary Oscillator to setup the PWM clock for 120Mhz
// ACLK = (REFCLK * M) / N
// ACLK = ((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
 ACLKCONbits.APSTSCLR = 7;    // Divide Auxiliary clock by 1
 ACLKCONbits.ENAPLL   = 1;    // Enable Auxiliary PLL

 while(ACLKCONbits.APLLCK != 1);   // Wait for Auxiliary PLL to Lock

////////////////////////// END OF SYSTEM CLOCK SET UP   //////////////////////////////////////


/////////////////////////      PWM1 MODULE  SET UP    /////////////////////////////////////////

//  ---  Period = 10 us (for frequency of 100 kHz)   ---
//  ---  Complementary Mode                          ---
//  ---  Master Time Base Mode  ---                  ---
 PTCON              = 0;    // PWM Time Base Control Register (Module Disabled)
 PTCON2bits.PCLKDIV = 0;    // Prescalar option: 1:1 maximum PWM timing

 PWMCON1bits.ITB    = 0;    // Master Time Base Mode
 IOCON1bits.PMOD    = 0;    // Complementary output mode
 PTPER              = 9592; // Master Time Base
 PDC1               = 4796; // Duty Cycle for PWM1 Module (50% - without dead time present)
 PWMCON1bits.MDCS   = 0;    // PDC provides duty cycle information
 PWMCON1bits.CAM    = 0;    // For edge-aligned mode of operation
 IOCON1bits.PENH    = 1;    // PWM1H is controlled by PWM module
 IOCON1bits.PENL    = 1;    // PWM1L is controlled by PWM module
 IOCON1bits.POLL    = 0;    // PWM1L is active high
 IOCON1bits.POLH    = 0;    // PWM1H is active high
 PWMCON1bits.IUE    = 0;    // Update duty cycle at start of next PWM cycle


// ---    Set up for Cycle-by-Cycle Mode     --- //
 FCLCON1bits.IFLTMOD = 0;  // Normal Fault Mode
 FCLCON1bits.FLTPOL  = 0;  // Fault input pin is set to active-high
 IOCON1bits.FLTDAT   = 0;  // Shuts down PWM1L and PWM1H signals to inactive state
 FCLCON1bits.CLSRC   = 1;  // Other than FLT1 source
 FCLCON1bits.FLTSRC  = 8;  // Select fault source FLT1, Pin 68 on IC
 FCLCON1bits.FLTMOD  = 1;  // PWM generator pins for FLTDAT values (cycle-by-cycle condition)


//  --- Set up for LEADING EDGE BLANKING    --- //
//      PWM1 Leading Edge Blanking Control Version 1) Register
 LEBCON1bits.PHR      = 1;   // Rising edge of PWM1H will trigger LEB counter
 LEBCON1bits.PHF      = 0;   // LEB ignores falling edge of PWM1H
 LEBCON1bits.PLR      = 0;   // Rising edge of PWM1L will trigger LEB counter
 LEBCON1bits.PLF      = 0;   // LEB ignores falling edge of PWM1L
 LEBCON1bits.CLLEBEN  = 0;   // Leading Edge Blanking is not applied to selected Current-Limit Input
 LEBDLY1bits.LEB      = 50;  // Leading edge blanking delay
 LEBCON1bits.FLTLEBEN = 1;   // Leading Edge Blanking is applied to Fault 1 Input
 
 // ---Added code for providing Trigger and PWM Interrupt  --- //
 TRIG1                = 0;  // Trigger PWM ISR at beginning of cycle
 TRGCON1bits.TRGDIV   = 3;  // Trigger output every 4th event\period
 TRGCON1bits.TRGSTRT  = 0;  // First trigger event occurs after four trigger match events
 PWMCON1bits.TRGIEN   = 1;  // Trigger event generates an interrupt request

///////////////////   END PWM1 MODULE SET UP  //////////////////////////////////////////////////

 // I/O Pin used for Fault Input
 TRISDbits.TRISD8 = 0;      // set RD8 as output digital I\O (pin 68)

 // --- Enable PWM1 module and interrupt  --- //
 PTCONbits.PTEN   = 1;    // Set bit to enable PWM module
 IEC5bits.PWM1IE  = 1;    // PWM1 interrupt request is enabled (for ISR)

   while(1)  // RUN PROGRAM CONTINUOUSLY
    {    
     // just let code run
      };

 return 0;
 
} // end of main


/////////////////// INTERRUPT SERVICE ROUTINE (ISR) FOR PWM MODULE   ///////////////////////////////////
void __attribute__((__interrupt__,no_auto_psv)) _PWM1Interrupt(void)
{
   LATDbits.LATD8 = 1;  // Toggle I\O RD8 HIGH

  // Added Nop()s delay to modulate width of fault signal
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();
  Nop();

  LATDbits.LATD8  = 0;  // Toggle I\O RD8 LOW
  IFS5bits.PWM1IF = 0;  // Clear the interrupt flag status bit
 }