example_280xeqep_pos_speed.c

2812例程以及 控制直流无刷电机程序

// TI File $Revision: /main/3 $
// Checkin $Date: December 3, 2004   13:31:22 $
//###########################################################################
//
// FILE:	Example_280xEqep_pos_speed_.c
//
// TITLE:	EQEP Speed and Position measurement
//
// ASSUMPTIONS:
//
//    This program requires the DSP280x header files.  
//    As supplied, this project is configured for "boot to SARAM" operation. 
//
//    Test requires the following hardware connections from QEP sensor to QEP peripheral
//          
//       GPIO20/EQEP1A <- EQEP Phase A signal
//       GPIO21/EQEP1B <- EQEP Phase B signal
//       GPIO23/EQEP1I <- EQEP Index Signal
//
//
//    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 test will provide position, speed measurement using capture unit (speed_pr)
//    speed measurement using unit time out (speed_fr).  
// 
//    * Maximum speed is configured to 6000rpm(BaseRpm)
//    * Minimum speed is assumed at 10rpm for capture pre-scalar selection
//    * Pole pair is configured to 2 (pole_pairs)
//    * QEP Encoder resolution is configured to 4000counts/revolution (mech_scaler)
//
// 	  SPEED_FR: High Speed Measurement is obtained by counting the QEP input pulses
//              for 10ms (unit timer set to 100Hz). 
//
//    SPEED_FR = { (Position Delta)/10ms } * 60 rpm
//
//
//    SPEED_PR: Low Speed Measurement is obtained by measuring time period of QEP edges.
//              Time measurement is averaged over 64edges for better results and 
//              capture unit performs the time measurement using pre-scaled SYSCLK
//
//              Note that pre-scaler for capture unit clock is selected such that
//              capture timer does not overflow at the required minimum RPM speed
//
//          Watch Variables: speed_fr - Speed measurement using QEP position counter
//                           speed_pr - Speed measurement using capture unit
//
//###########################################################################
// Original Author S.D.
//
// $TI Release: DSP280x V1.10 $
// $Release Date: April 18, 2005 $
//###########################################################################

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File
#include "Example_posspeed.h"   // Example specific Include file

void initEpwm();
interrupt void prdTick(void);

POSSPEED qep_posspeed=POSSPEED_DEFAULTS;


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 only init GPIO for eQEP1
// This function is found in DSP280x_EQep.c
   InitEQep1Gpio();

// 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();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.  
   EALLOW;  // This is needed to write to EALLOW protected registers
   PieVectTable.EPWM1_INT= &prdTick;
   EDIS;    // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:
   initEpwm();
   
// Step 5. User specific code, enable interrupts:
// Enable CPU INT1 which is connected to CPU-Timer 0:
   IER |= M_INT3;

// Enable TINT0 in the PIE: Group 3 interrupt 1
   PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
   
// Enable global Interrupts and higher priority real-time debug events:
   EINT;   // Enable Global interrupt INTM
   ERTM;   // Enable Global realtime interrupt DBGM
   
   qep_posspeed.init(&qep_posspeed);
  	
	for(;;)
	{

	}

} 


interrupt void prdTick(void)
{
   // Position and Speed measurement
   qep_posspeed.calc(&qep_posspeed);
   
   // Control loop code for position control & Speed contol
   

   // Acknowledge this interrupt to receive more interrupts from group 1
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
   EPwm1Regs.ETCLR.bit.INT=1;
}