epwm_deadband.rar

  • hitwjz
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  • 2018-02-05 11:40
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DSP生成PWM,基于TI公司TMS320F28335,例程可运行。
epwm_deadband.rar
  • Example_2833xEPwmDeadband.gel
    1020B
  • Example_2833xEPwmDeadBand.sbl
    7.8KB
  • Example_2833xEPwmDeadBand.pjt
    1.9KB
  • Example_2833xEPwmDeadBand.c
    13.8KB
  • Example_2833xEPwmDeadBand.paf2
    4.4KB
内容介绍
// TI File $Revision: /main/9 $ // Checkin $Date: April 21, 2008 15:41:33 $ //########################################################################### // // FILE: Example_2833xEpwmDeadBand.c // // TITLE: Check PWM deadband generation // // ASSUMPTIONS: // // This program requires the DSP2833x header files. // // Monitor ePWM1 - ePWM3 on an Oscilloscope as described // below. // // EPWM1A is on GPIO0 // EPWM1B is on GPIO1 // // EPWM2A is on GPIO2 // EPWM2B is on GPIO3 // // EPWM3A is on GPIO4 // EPWM3B is on GPIO5 // // As supplied, this project is configured for "boot to SARAM" // operation. The 2833x 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, // // $Boot_Table: // // GPIO87 GPIO86 GPIO85 GPIO84 // XA15 XA14 XA13 XA12 // PU PU PU PU // ========================================== // 1 1 1 1 Jump to Flash // 1 1 1 0 SCI-A boot // 1 1 0 1 SPI-A boot // 1 1 0 0 I2C-A boot // 1 0 1 1 eCAN-A boot // 1 0 1 0 McBSP-A boot // 1 0 0 1 Jump to XINTF x16 // 1 0 0 0 Jump to XINTF x32 // 0 1 1 1 Jump to OTP // 0 1 1 0 Parallel GPIO I/O boot // 0 1 0 1 Parallel XINTF boot // 0 1 0 0 Jump to SARAM <- "boot to SARAM" // 0 0 1 1 Branch to check boot mode // 0 0 1 0 Boot to flash, bypass ADC cal // 0 0 0 1 Boot to SARAM, bypass ADC cal // 0 0 0 0 Boot to SCI-A, bypass ADC cal // Boot_Table_End$ // // DESCRIPTION: // // This example configures ePWM1, ePWM2 and ePWM3 for: // - Count up/down // - Deadband // // 3 Examples are included: // * ePWM1: Active low PWMs // * ePWM2: Active low complementary PWMs // * ePWM3: Active high complementary PWMs // // Each ePWM is configured to interrupt on the 3rd zero event // when this happens the deadband is modified such that // 0 <= DB <= DB_MAX. That is, the deadband will move up and // down between 0 and the maximum value. // // // View the EPWM1A/B, EPWM2A/B and EPWM3A/B waveforms // via an oscilloscope // // //########################################################################### // $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $ // $Release Date: August 4, 2009 $ //########################################################################### #include "DSP28x_Project.h" // Device Headerfile and Examples Include File // Prototype statements for functions found within this file. void InitEPwm1Example(void); void InitEPwm2Example(void); void InitEPwm3Example(void); interrupt void epwm1_isr(void); interrupt void epwm2_isr(void); interrupt void epwm3_isr(void); // Global variables used in this example Uint32 EPwm1TimerIntCount; Uint32 EPwm2TimerIntCount; Uint32 EPwm3TimerIntCount; Uint16 EPwm1_DB_Direction; Uint16 EPwm2_DB_Direction; Uint16 EPwm3_DB_Direction; // Maximum Dead Band values #define EPWM1_MAX_DB 0x03FF #define EPWM2_MAX_DB 0x03FF #define EPWM3_MAX_DB 0x03FF #define EPWM1_MIN_DB 0 #define EPWM2_MIN_DB 0 #define EPWM3_MIN_DB 0 // To keep track of which way the Dead Band is moving #define DB_UP 1 #define DB_DOWN 0 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. Initalize 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 // For this case just init GPIO pins for ePWM1, ePWM2, ePWM3 // These functions are in the DSP2833x_EPwm.c file InitEPwm1Gpio(); InitEPwm2Gpio(); InitEPwm3Gpio(); // 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_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 DSP2833x_InitPeripherals.c // InitPeripherals(); // Not required for this example EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; EDIS; InitEPwm1Example(); InitEPwm2Example(); InitEPwm3Example(); EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; EDIS; // Step 5. User specific code, enable interrupts // Initalize counters: EPwm1TimerIntCount = 0; EPwm2TimerIntCount = 0; EPwm3TimerIntCount = 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 = 1; PieCtrlRegs.PIEIER3.bit.INTx2 = 1; PieCtrlRegs.PIEIER3.bit.INTx3 = 1; // 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"); } } interrupt void epwm1_isr(void) { if(EPwm1_DB_Direction == DB_UP) { if(EPwm1Regs.DBFED < EPWM1_MAX_DB) { EPwm1Regs.DBFED++; EPwm1Regs.DBRED++; } else { EPwm1_DB_Direction = DB_DOWN; EPwm1Regs.DBFED--; EPwm1Regs.DBRED--; } } else { if(EPwm1Regs.DBFED == EPWM1_MIN_DB) { EPwm1_DB_Direction = DB_UP; EPwm1Regs.DBFED++; EPwm1Regs.DBRED++; } else { EPwm1Regs.DBFED--; EPwm1Regs.DBRED--; } } EPwm1TimerIntCount++; // 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; } interrupt void epwm2_isr(void) { if(EPwm2_DB_Direction == DB_UP) { if(EPwm2Regs.DBFED < EPWM2_MAX_DB) { EPwm2Regs.DBFED++; EPwm2Regs.DBRED++; } else { EPwm2_DB_Direction = DB_DOWN; EPwm2Regs.DBFED--; EPwm2Regs.DBRED--; }
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