example_280xhrpwm_sfo.c

这是关DSP 2000的程序。主要是280**系列。

// TI File $Revision: /main/9 $
// Checkin $Date: June 21, 2007   13:50:44 $
//###########################################################################
//
// FILE:	Example_280xHRPWM_SFO.c
//
// TITLE:	DSP280x Device HRPWM example
//
// ASSUMPTIONS:
//
//
//    This program requires the DSP280x header files.
//
//    Monitor ePWM1-ePWM4 pins on an oscilloscope as described
//    below.
//
//       EPWM1A is on GPIO0
//       EPWM2A is on GPIO2
//       EPWM3A is on GPIO4
//		 EPWM4A is on GPIO6
//
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The 280x Boot Mode table is shown below.
//    For information on configuring the boot mode of an eZdsp,
//    please refer to the documentation included with the eZdsp,
//
//       Boot      GPIO18     GPIO29    GPIO34
//       Mode      SPICLKA    SCITXDA
//                  SCITXB
//       -------------------------------------
//       Flash       1          1        1
//       SCI-A       1          1        0
//       SPI-A       1          0        1
//       I2C-A       1          0        0
//       ECAN-A      0          1        1
//       SARAM       0          1        0  <- "boot to SARAM"
//       OTP         0          0        1
//       I/0         0          0        0
//
//
//
// DESCRIPTION:
//
//       This example modifies the MEP control registers to show edge displacement
//       due to the HRPWM control extension of the respective ePWM module.
//
//       This example calls the following TI's MEP Scale Factor Optimizer (SFO)
//       software library functions:
//
//       void SFO_MepEn(int i);
//            initialize MEP_Scalefactor[i] dynamically when HRPWM is in use.
//
//       void SFO_MepDis(int i);
//            initialize MEP_Scalefactor[i] when HRPWM is not used
//
//       Where MEP_ScaleFactor[5] is a global array variable used by the SFO library
//
//       This example is intended to explain the HRPWM capabilities. The code can be
//       optimized for code efficiency. Refer to TI's Digital power application
//       examples and TI Digital Power Supply software libraries for details.
//
//       All ePWM1A,2A,3A,4A channels (GPIO0, GPIO2, GPIO4, GPIO6) will have fine
//       edge movement due to the HRPWM logic
//
//            1. 3.33MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz), ePWM1A toggle low/high with MEP control on falling edge
//
//            2. 3.33MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz), ePWM2A toggle low/high with MEP control on falling edge
//
//            3. 3.33MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz), ePWM3A toggle high/low with MEP control on falling edge
//
//            4. 3.33MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz), ePWM4A toggle high/low with MEP control on falling edge
//
//	To load and run this example:
//            1. Run this example at 100MHz SYSCLKOUT (or 60 MHz SYSCLKOUT for 60 MHz devices)
//            2. Load the Example_280xHRPWM_SFO.gel and observe variables in the watch window
//            3. Activate Real time mode
//            4. Run the code
//            5. Watch ePWM1A-4A waveforms on a Oscillosope
//            6. In the watch window:
//               Set the variable UpdateFine = 1  to observe the ePWMxA output
//               with HRPWM capabilites (default)
//               Observe the duty cycle of the waveform changes in fine MEP steps
//            7. In the watch window:
//               Change the variable UpdateFine to 0, to observe the
//               ePWMxA output without HRPWM capabilites
//               Observe the duty cycle of the waveform changes in coarse steps of 10nsec.
//
// IMPORTANT NOTE!!!!!
//
// THE SFO.H FUNCTIONS INCLUDED WITH THIS EXAMPLE ONLY SUPPORTS EPWM1-EPWM4. FOR
// SUPPORT FOR MORE THAN 4 EPWMS, USE SFO_V5.H WITH THE SFO_TI_BUILD_V5.LIB LIBRARY.
// SEE THE HRPWM REFERENCE GUIDE (SPRU924) FOR USAGE INFORMATION AND DIFFERENCES
// BETWEEN VERSIONS.
//
//
//###########################################################################
// $TI Release: DSP280x Header Files V1.60 $
// $Release Date: December 3, 2007 $
//###########################################################################


#include "DSP280x_Device.h"     	// DSP280x Headerfile
#include "DSP280x_Examples.h"     	// DSP280x Examples Headerfile
#include "DSP280x_EPwm_defines.h" 	// useful defines for initialization
#include "SFO.h"					// SFO library headerfile

// Declare your function prototypes here
//---------------------------------------------------------------
void HRPWM1_Config(int);
void HRPWM2_Config(int);
void HRPWM3_Config(int);
void HRPWM4_Config(int);

// General System nets - Useful for debug
Uint16 j,duty, DutyFine, n, UpdateFine;
volatile int i;
Uint32 temp;

// Global array used by the SFO library
int16 MEP_ScaleFactor[5];


volatile struct EPWM_REGS *ePWM[] =
 			 { &EPwm1Regs,	&EPwm1Regs,	&EPwm2Regs,	&EPwm3Regs,	&EPwm4Regs,	&EPwm5Regs,	&EPwm6Regs};


void main(void)
{

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP280x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO:
// 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
// For this case, just init GPIO for ePWM1-ePWM4

// For this case just init GPIO pins for ePWM1, ePWM2, ePWM3, ePWM4
// These functions are in the DSP280x_EPwm.c file
   InitEPwm1Gpio();
   InitEPwm2Gpio();
   InitEPwm3Gpio();
   InitEPwm4Gpio();

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
   DINT;

// Initialize the PIE control registers to their default state.
// 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
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP280x_DefaultIsr.c.
// This function is found in DSP280x_PieVect.c.
   InitPieVectTable();

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP280x_InitPeripherals.c
// InitPeripherals();  // Not required for this example

// For this example, only initialize the ePWM
// Step 5. User specific code, enable interrupts:

   UpdateFine = 1;
   DutyFine   = 0;

   EALLOW;
   SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
   EDIS;

//  MEP_ScaleFactor variables iitialization for SFO library functions
    MEP_ScaleFactor[0] = 0;											//Common Variables for SFO functions
	MEP_ScaleFactor[1] = 0;											//SFO for HRPWM1
	MEP_ScaleFactor[2] = 0;											//SFO for HRPWM2
	MEP_ScaleFactor[3] = 0;											//SFO for HRPWM3
	MEP_ScaleFactor[4] = 0;											//SFO for HRPWM4

// 	MEP_ScaleFactor variables initialized using function SFO_MepDis
	while ( MEP_ScaleFactor[1] == 0 ) SFO_MepDis(1);				//SFO for HRPWM1
	while ( MEP_ScaleFactor[2] == 0 ) SFO_MepDis(2);				//SFO for HRPWM2
	while ( MEP_ScaleFactor[3] == 0 ) SFO_MepDis(3);				//SFO for HRPWM3
	while ( MEP_ScaleFactor[4] == 0 ) SFO_MepDis(4);				//SFO for HRPWM4

// 	Initialize a common seed variable MEP_ScaleFactor[0] required for all SFO functions
	MEP_ScaleFactor[0] = MEP_ScaleFactor[1];                        //Common Variable for SFO library functions
// Some useful Period vs Frequency values
//  SYSCLKOUT =     100MHz         60 MHz
//  ------------------------------------------------
//	Period	        Frequency      Frequency
//	1000	        100 KHz        60 kHz
//	800		        125 KHz        75 kHz
//	600		        167 KHz        100 kHz
//	500		        200 KHz        120 kHz
//	250		        400 KHz        240 kHz
//	200		        500 KHz        300 kHz
//	100		        1.0 MHz        600 kHz
//	50		        2.0 MHz        1.2 Mhz
//  30              3.33 MHz       2.0 MHz
//	25		        4.0 MHz        2.4 Mhz
//	20		        5.0 MHz        3.0 Mhz
//	12		        8.33 MHz       5.0 MHz
//	10		        10.0 MHz       6.0 MHz
//	9		        11.1 MHz       6.7 MHz
//	8		        12.5 MHz       7.5 MHz
//	7		        14.3 MHz       8.6 MHz
//	6		        16.7 MHz       10.0 MHz
//	5		        20.0 MHz       12.0 MHz


//====================================================================
// ePWM and HRPWM register initializaition
//====================================================================
   HRPWM1_Config(30);	    // ePWM1 target, 3.33 MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz)
   HRPWM2_Config(30);	    // ePWM2 target, 3.33 MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz)
   HRPWM3_Config(30);	    // ePWM3 target, 3.33 MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz)
   HRPWM4_Config(30);	    // ePWM4 target, 3.33 MHz PWM (SYSCLK=100MHz) or 2 MHz PWM (SYSCLK=60MHz)

   EALLOW;
   SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;

   EDIS;

   for(;;)
   {
     	// Sweep DutyFine as a Q15 number from 0.2 - 0.999
		for(DutyFine = 0x2300; DutyFine < 0x7000; DutyFine++)
		{
		// Variables
			int16 CMPA_reg_val, CMPAHR_reg_val;
			int32 temp;

			if(UpdateFine)
			{
			/*
			// CMPA_reg_val is calculated as a Q0.
			// Since DutyFine is a Q15 number, and the period is Q0
			// the product is Q15. So to store as a Q0, we shift right
			// 15 bits.

			CMPA_reg_val = ((long)DutyFine * EPwm1Regs.TBPRD)>>15;

			// This next step is to obtain the remainder which was
			// truncated during our 15 bit shift above.
			// compute the whole value, and then subtract CMPA_reg_val
			// shifted LEFT 15 bits: