基于DSP产生SPWM的程序

#include "DSP280x_Device.h" // DSP280x Headerfile Include File

#include "DSP280x_Examples.h" // DSP280x Examples Include File

typedef struct

{

volatile struct EPWM_REGS *EPwmRegHandle;

Uint16 EPwm_CMPA_Direction;

Uint16 EPwm_CMPB_Direction;

Uint16 EPwmTimerIntCount;

void InitEPwm1Example(void);

void InitEPwm2Example(void);

void InitEPwm3Example(void);

interrupt void epwm1_isr(void);

interrupt void epwm2_isr(void);

interrupt void epwm3_isr(void);

void update_compare(EPWM_INFO*);

// Global variables used in this example

EPWM_INFO epwm1_info;

EPWM_INFO epwm2_info;

#define EPWM1_MIN_CMPB 50

#define EPWM2_TIMER_TBPRD 2000 // Period register

#define EPWM2_MAX_CMPA 1950

#define EPWM2_MIN_CMPA 50

#define EPWM2_MAX_CMPB 1950

#define EPWM2_MIN_CMPB 50

#define EPWM3_TIMER_TBPRD 2000 // Period register

#define EPWM3_MAX_CMPA 950

#define EPWM3_MIN_CMPA 50

#define EPWM3_MAX_CMPB 1950

#define EPWM3_MIN_CMPB 1050

// To keep track of which way the compare value is moving

#define EPWM_CMP_UP 1

#define EPWM_CMP_DOWN 0

InitSysCtrl();

// This example function is found in the DSP280x_Gpio.c file and

// illustrates how to set the GPIO to it's default state.

// InitGpio(); // Skipped for this example

EALLOW;

GpioCtrlRegs.GPAMUX1.all = 0x0; // GPIO pin

GpioCtrlRegs.GPADIR.all = 0xFF; // Output pin

GpioDataRegs.GPADAT.all =0xFF; // Close LEDs

EDIS;

// For this case just init GPIO pins for ePWM1, ePWM2, ePWM3

// These functions are in the DSP280x_EPwm.c file

EDIS;

// Step 3. Clear all interrupts and initialize PIE vector table:

// Disable CPU interrupts

DINT;

// The default state is all PIE interrupts disabled and flags

// are cleared.

// This function is found in the DSP280x_PieCtrl.c file.

InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:

IER = 0x0000;

IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt

InitPieVectTable();

// ISR functions found within this file.

EALLOW; // This is needed to write to EALLOW protected registers

PieVectTable.EPWM1_INT = &epwm1_isr;

PieVectTable.EPWM2_INT = &epwm2_isr;

PieVectTable.EPWM3_INT = &epwm3_isr;

EDIS; // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:

// This function is found in DSP280x_InitPeripherals.c

// InitPeripherals(); // Not required for this example

InitEPwm2Example();

EALLOW;

SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;

EDIS;