I am using TMDSDOCK28335 board with TMS320F28335 control card.I have tried with the external connection for boot to flash i.e. connecting Pin 84,85,86,87 to 1 but the situation remains the same. I am attaching the code i used for it Kindly comment if any error is there in the code // Included Files // #include "DSP28x_Project.h" // Device Headerfile and Examples Include File #include // // Defines that 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 // // Defines for the period for each timer // #define PWM1_TIMER_TBPRD 0x1FFF #define PWM2_TIMER_TBPRD 0x1FFF #define PWM3_TIMER_TBPRD 0x1FFF // // Make this long enough so that we can see an LED toggle // #define DELAY 1000000L // // Functions that will be run from RAM need to be assigned to // a different section. This section will then be mapped using // the linker cmd file. // #pragma CODE_SECTION(epwm1_timer_isr, "ramfuncs"); #pragma CODE_SECTION(epwm2_timer_isr, "ramfuncs"); // // Function Prototypes // __interrupt void epwm1_timer_isr(void); __interrupt void epwm2_timer_isr(void); __interrupt void epwm3_timer_isr(void); void InitEPwmTimer(void); // // Globals // Uint32 EPwm1TimerIntCount; Uint32 EPwm2TimerIntCount; Uint32 EPwm3TimerIntCount; Uint32 LoopCount; // // These are defined by the linker (see F28335.cmd) // extern Uint16 RamfuncsLoadStart; extern Uint16 RamfuncsLoadEnd; extern Uint16 RamfuncsRunStart; extern Uint16 RamfuncsLoadSize; // // Main // void main(void) { // // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP2833x_SysCtrl.c file. // InitSysCtrl(); // // Step 2. Initialize GPIO: // This example function is found in the DSP2833x_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 DSP2833x_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 DSP2833x_DefaultIsr.c. // This function is found in DSP2833x_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; EDIS; // This is needed to disable write to EALLOW protected registers // // Step 4. Initialize all the Device Peripherals: // This function is found in DSP2833x_InitPeripherals.c // //InitPeripherals(); // Not required for this example InitEPwmTimer(); // For this example, only initialize the ePWM Timers // // Step 5. User specific code, enable interrupts EALLOW; GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0; GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 0; GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1; GpioCtrlRegs.GPADIR.bit.GPIO31 = 1; EDIS; // // Copy time critical code and Flash setup code to RAM // This includes the following ISR functions: epwm1_timer_isr(), // epwm2_timer_isr(), epwm3_timer_isr and and InitFlash(); // The RamfuncsLoadStart, RamfuncsLoadEnd, and RamfuncsRunStart // symbols are created by the linker. Refer to the F28335.cmd file. // memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (Uint32)&RamfuncsLoadSize); // // Call Flash Initialization to setup flash waitstates // This function must reside in RAM // InitFlash(); // // Initialize counters // EPwm1TimerIntCount = 0; EPwm2TimerIntCount = 0; EPwm3TimerIntCount = 0; LoopCount = 0; // // Enable CPU INT3 which is connected to EPWM1-3 INT // IER |= M_INT3; // // Enable EPWM INTn in the PIE: Group 3 interrupt 1-3 // PieCtrlRegs.PIEIER3.bit.INTx1 = PWM1_INT_ENABLE; PieCtrlRegs.PIEIER3.bit.INTx2 = PWM2_INT_ENABLE; PieCtrlRegs.PIEIER3.bit.INTx3 = PWM3_INT_ENABLE; // // Enable global Interrupts and higher priority real-time debug events // EINT; // Enable Global interrupt INTM ERTM; // Enable Global realtime interrupt DBGM GpioDataRegs.GPBSET.bit.GPIO34 = 1; // // Step 6. IDLE loop. Just sit and loop forever (optional) // } // // InitEPwmTimer - // void InitEPwmTimer(void) { 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 // // 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; EPwm1Regs.TBPHS.half.TBPHS = 100; EPwm2Regs.TBPHS.half.TBPHS = 200; EPwm3Regs.TBPHS.half.TBPHS = 300; 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.bit.INTPRD = ET_2ND; // Generate INT on 2nd event EPwm3Regs.TBPRD = PWM3_TIMER_TBPRD; EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up EPwm3Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Enable INT on Zero event EPwm3Regs.ETSEL.bit.INTEN = PWM3_INT_ENABLE; // Enable INT EPwm3Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Start all the timers synced EDIS; GpioDataRegs.GPBSET.bit.GPIO34 = 1; } // // epwm1_timer_isr -This ISR MUST be executed from RAM as it will put the Flash // into Sleep Interrupt routines uses in this example // __interrupt void epwm1_timer_isr(void) { // // Put the Flash to sleep // EALLOW; FlashRegs.FPWR.bit.PWR = FLASH_SLEEP; EDIS; EPwm1TimerIntCount++; GpioDataRegs.GPBSET.bit.GPIO34 = 1; // // Clear INT flag for this timer // EPwm1Regs.ETCLR.bit.INT = 1; // // Acknowledge this interrupt to receive more interrupts from group 3 // PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } // // epwm2_timer_isr - This ISR MUST be executed from RAM as it will put the // Flash into Standby // __interrupt void epwm2_timer_isr(void) { EPwm2TimerIntCount++; // // Put the Flash into standby // EALLOW; FlashRegs.FPWR.bit.PWR = FLASH_STANDBY; EDIS; GpioDataRegs.GPBSET.bit.GPIO34 = 1; // // Clear INT flag for this timer // EPwm2Regs.ETCLR.bit.INT = 1; // // Acknowledge this interrupt to receive more interrupts from group 3 // PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } // // epwm3_timer_isr - // __interrupt void epwm3_timer_isr(void) { Uint16 i; EPwm3TimerIntCount++; // // Short Delay to simulate some ISR Code // for(i = 1; i < 0x01FF; i++) { } GpioDataRegs.GPBSET.bit.GPIO34 = 1; // // Clear INT flag for this timer // EPwm3Regs.ETCLR.bit.INT = 1; // // Acknowledge this interrupt to receive more interrupts from group 3 // PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } // // End of File //
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