关于DSPF28335写的SPWM代码分享给大家
源程序如下:
- /*
- * main.c
- */
- #include "DSP28x_Project.h" // Device Headerfile and Examples Include File
- // Prototype statements for functions found within this file.
- void InitEPwm1Example(void);
- extern void InitSpwm(void);
- 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
- // For this case just init GPIO pins for ePWM1, ePWM2, ePWM3
- // These functions are in the DSP2833x_EPwm.c file
- InitEPwm1Gpio();
- // 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_INT_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
- // For this example, only initialize the ePWM
- EALLOW;
- SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
- EDIS;
- InitEPwm1Example();
- InitSpwm();
- EALLOW;
- SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
- EDIS;
- // Step 5. User specific code, enable interrupts:
- // 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;
- // 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");
- }
- }
- void InitEPwm1Example()
- {
- // Setup TBCLK
- EPwm1Regs.TBPRD = 0xffff; // Set timer period 801 TBCLKs
- EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
- EPwm1Regs.TBCTR = 0x0000; // Clear counter
- // Set Compare values
- EPwm1Regs.CMPA.half.CMPA = 0x7fff; // Set compare A value
- EPwm1Regs.CMPB = 0x7fff; // Set Compare B value
- // Setup counter mode
- EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up
- EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
- EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV2; // Clock ratio to SYSCLKOUT
- EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV8;
- // Setup shadowing
- EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
- EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
- EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // Load on Zero
- EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
- // Set actions
- EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on event A, up count
- EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR; // Clear PWM1A on event A, down count
- EPwm1Regs.AQCTLB.bit.CBU = AQ_SET; // Set PWM1B on event B, up count
- EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; // Clear PWM1B on event B, down count
- // Interrupt where we will change the Compare Values
- EPwm1Regs.ETSEL.bit.INTSEL = ET_CTRU_CMPA; // Select INT on Zero event
- EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT
- EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on 3rd event
- }
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SPWM.zip
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