// TI File $Revision: /main/1 $
// Checkin $Date: September 19, 2008 16:34:39 $
//###########################################################################
//
// FILE: Example_2802xEPwmTimerInt.c
//
// TITLE: DSP2802x ePWM Timer Interrupt example.
//
// ASSUMPTIONS:
//
// This program requires the DSP2802x header files.
//
// Other then boot mode configuration, no other hardware configuration
// is required.
//
// As supplied, this project is configured for "boot to SARAM"
// operation. The 2802x 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_Table
// While an emulator is connected to your device, the TRSTn pin = 1,
// which sets the device into EMU_BOOT boot mode. In this mode, the
// peripheral boot modes are as follows:
//
// Boot Mode: EMU_KEY EMU_BMODE
// (0xD00) (0xD01)
// ---------------------------------------
// Wait !=0x55AA X
// I/O 0x55AA 0x0000
// SCI 0x55AA 0x0001
// Wait 0x55AA 0x0002
// Get_Mode 0x55AA 0x0003
// SPI 0x55AA 0x0004
// I2C 0x55AA 0x0005
// OTP 0x55AA 0x0006
// Wait 0x55AA 0x0007
// Wait 0x55AA 0x0008
// SARAM 0x55AA 0x000A <-- "Boot to SARAM"
// Flash 0x55AA 0x000B
// Wait 0x55AA Other
//
// Write EMU_KEY to 0xD00 and EMU_BMODE to 0xD01 via the debugger
// according to the Boot Mode Table above. Build/Load project,
// Reset the device, and Run example
//
// $End_Boot_Table
//
//
//
// DESCRIPTION:
//
// This example configures the ePWM Timers and increments
// a counter each time an interrupt is taken.
//
// As supplied:
//
// All ePWM's are initalized.
//
// All timers have the same period
// The timers are started sync'ed
// An interrupt is taken on a zero event for each ePWM timer
//
// ePWM1: takes an interrupt every event
// ePWM2: takes an interrupt every 2nd event
// ePWM3: takes an interrupt every 3rd event
// ePWM4: takes an interrupt every event
//
// Thus the Interrupt count for ePWM1 and ePWM4 should be equal
// The interrupt count for ePWM2 should be about half that of ePWM1
// and the interrupt count for ePWM3 should be about 1/3 that of ePWM1
//
// Watch Variables:
// EPwm1TimerIntCount
// EPwm2TimerIntCount
// EPwm3TimerIntCount
// EPwm4TimerIntCount
//
//###########################################################################
// $TI Release: 2802x Header Files V1.00 $
// $Release Date: November 10, 2008 $
//###########################################################################
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
// Configure which ePWM timer interrupts are enabled at the PIE level:
// 1 = enabled, 0 = disabled
#define PWM1_INT_ENABLE 1
#define PWM2_INT_ENABLE 1
#define PWM3_INT_ENABLE 1
#define PWM4_INT_ENABLE 1
// Configure the period for each timer
#define PWM1_TIMER_TBPRD 0x1FFF
#define PWM2_TIMER_TBPRD 0x1FFF
#define PWM3_TIMER_TBPRD 0x1FFF
#define PWM4_TIMER_TBPRD 0x1FFF
// Prototype statements for functions found within this file.
interrupt void epwm1_timer_isr(void);
interrupt void epwm2_timer_isr(void);
interrupt void epwm3_timer_isr(void);
interrupt void epwm4_timer_isr(void);
void InitEPwmTimer(void);
// Global variables used in this example
Uint32 EPwm1TimerIntCount;
Uint32 EPwm2TimerIntCount;
Uint32 EPwm3TimerIntCount;
Uint32 EPwm4TimerIntCount;
void main(void)
{
int i;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2802x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initalize GPIO:
// This example function is found in the DSP2802x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio(); // Skipped for this example
// 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 DSP2802x_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 DSP2802x_DefaultIsr.c.
// This function is found in DSP2802x_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 = &epwm1_timer_isr;
PieVectTable.EPWM2_INT = &epwm2_timer_isr;
PieVectTable.EPWM3_INT = &epwm3_timer_isr;
PieVectTable.EPWM4_INT = &epwm4_timer_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2802x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
InitEPwmTimer(); // For this example, only initialize the ePWM Timers
// Step 5. User specific code, enable interrupts:
// Initalize counters:
EPwm1TimerIntCount = 0;
EPwm2TimerIntCount = 0;
EPwm3TimerIntCount = 0;
EPwm4TimerIntCount = 0;
// Enable CPU INT3 which is connected to EPWM1-6 INT:
IER |= M_INT3;
// Enable EPWM INTn in the PIE: Group 3 interrupt 1-6
PieCtrlRegs.PIEIER3.bit.INTx1 = PWM1_INT_ENABLE;
PieCtrlRegs.PIEIER3.bit.INTx2 = PWM2_INT_ENABLE;
PieCtrlRegs.PIEIER3.bit.INTx3 = PWM3_INT_ENABLE;
PieCtrlRegs.PIEIER3.bit.INTx4 = PWM4_INT_ENABLE;
// Enable global Interrupts and higher priority real-time debug events:
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
// Step 6. IDLE loop. Just sit and loop forever (optional):
for(;;)
{
asm(" NOP");
for(i=1;i<=10;i++)
{}
}
}
void InitEPwmTimer()
{
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // Stop all the TB clocks
EDIS;
// Setup Sync
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
EPwm4Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
// Allow each timer to be sync'ed
EPwm1Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm4Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm1Regs.TBPHS.half.TBPHS = 100;
EPwm2Regs.TBPHS.half.TBPHS = 200;
EPwm3Regs.TBPHS.half.TBPHS = 300;
EPwm4Regs.TBPHS.half.TBPHS = 400;
EPwm1Regs.TBPRD = PWM1_TIMER_TBPRD;
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
EPwm1Regs.ETSEL.bit.INTEN = PWM1_INT_ENABLE; // Enable INT
EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on 1st event
EPwm2Regs.TBPRD = PWM2_TIMER_TBPRD;
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Enable INT on Zero event
EPwm2Regs.ETSEL.bit.INTEN = PWM2_INT_ENABLE; // Enable INT
EPwm2Regs.ETPS.b
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