dsp中 pwm程序 很好用哦

//########################################################################### // // FILE: Example_281xEvPwm.c // // TITLE: DSP281x Event Manager PWM Generation. // // ASSUMPTIONS: // // This program requires the DSP281x V1.00 header files. // As supplied, this project is configured for "boot to H0" operation. // // Other then boot mode pin configuration, no other hardware configuration // is required. // // DESCRIPTION: // // This program sets up the EV timers (TIMER1, TIMER2, TIMER3 and TIMER4) // to generate T1PWM, T2PWM, T3PWM, T4PWM and PWM1-12 waveforms. // The user can then observe the waveforms using an scope. // // //########################################################################### // // Ver | dd mmm yyyy | Who | Description of changes // =====|=============|======|=============================================== // 1.00| 11 Sep 2003 | L.H. | No change since previous version (v.58 Alpha) //########################################################################### #include "DSP281x_Device.h" // DSP281x Headerfile Include File #include "DSP281x_Examples.h" // DSP281x Examples Include File // Prototype statements for functions found within this file. void init_eva(void); void init_evb(void); // Global counts used in this example void main(void) { // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP281x_SysCtrl.c file. InitSysCtrl(); // Step 2. Initalize GPIO: // This example function is found in the DSP281x_Gpio.c file and // illustrates how to set the GPIO to it's default state. // InitGpio(); // Skipped for this example // Initialize only GPAMUX and GPBMUX for this test EALLOW; // Enable PWM pins GpioMuxRegs.GPAMUX.all = 0x00FF; // EVA PWM 1-6 pins GpioMuxRegs.GPBMUX.all = 0x00FF; // EVB PWM 7-12 pins EDIS; // Step 3. Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts DINT; // Initialize 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 DSP281x_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 DSP281x_DefaultIsr.c. // This function is found in DSP281x_PieVect.c. InitPieVectTable(); // Step 4. Initialize all the Device Peripherals: // This function is found in DSP281x_InitPeripherals.c // InitPeripherals(); // Not required for this example init_eva(); init_evb(); // Step 5. User specific code, enable interrupts: // Just sit and loop forever: // PWM pins can be observed with a scope. for(;;); } void init_eva() { // EVA Configure T1PWM, T2PWM, PWM1-PWM6 // Initalize the timers // Initalize EVA Timer1 EvaRegs.T1PR = 0xFFFF; // Timer1 period EvaRegs.T1CMPR = 0x3C00; // Timer1 compare EvaRegs.T1CNT = 0x0000; // Timer1 counter // TMODE = continuous up/down // Timer enable // Timer compare enable EvaRegs.T1CON.all = 0x1042; // Initalize EVA Timer2 EvaRegs.T2PR = 0x0FFF; // Timer2 period EvaRegs.T2CMPR = 0x03C0; // Timer2 compare EvaRegs.T2CNT = 0x0000; // Timer2 counter // TMODE = continuous up/down // Timer enable // Timer compare enable EvaRegs.T2CON.all = 0x1042; // Setup T1PWM and T2PWM // Drive T1/T2 PWM by compare logic EvaRegs.GPTCONA.bit.TCMPOE = 1; // Polarity of GP Timer 1 Compare = Active low EvaRegs.GPTCONA.bit.T1PIN = 1; // Polarity of GP Timer 2 Compare = Active high EvaRegs.GPTCONA.bit.T2PIN = 2; // Enable compare for PWM1-PWM6 EvaRegs.CMPR1 = 0x0C00; EvaRegs.CMPR2 = 0x3C00; EvaRegs.CMPR3 = 0xFC00; // Compare action control. Action that takes place // on a cmpare event // output pin 1 CMPR1 - active high // output pin 2 CMPR1 - active low // output pin 3 CMPR2 - active high // output pin 4 CMPR2 - active low // output pin 5 CMPR3 - active high // output pin 6 CMPR3 - active low EvaRegs.ACTRA.all = 0x0666; EvaRegs.DBTCONA.all = 0x0000; // Disable deadband EvaRegs.COMCONA.all = 0xA600; } void init_evb() { // EVB Configure T3PWM, T4PWM and PWM7-PWM12 // Step 1 - Initialize the Timers // Initialize EVB Timer3 // Timer3 controls T3PWM and PWM7-12 EvbRegs.T3PR = 0xFFFF; // Timer3 period EvbRegs.T3CMPR = 0x3C00; // Timer3 compare EvbRegs.T3CNT = 0x0000; // Timer3 counter // TMODE = continuous up/down // Timer enable // Timer compare enable EvbRegs.T3CON.all = 0x1042; // Initialize EVB Timer4 // Timer4 controls T4PWM EvbRegs.T4PR = 0x00FF; // Timer4 period EvbRegs.T4CMPR = 0x0030; // Timer4 compare EvbRegs.T4CNT = 0x0000; // Timer4 counter // TMODE = continuous up/down // Timer enable // Timer compare enable EvbRegs.T4CON.all = 0x1042; // Setup T3PWM and T4PWM // Drive T3/T4 PWM by compare logic EvbRegs.GPTCONB.bit.TCMPOE = 1; // Polarity of GP Timer 3 Compare = Active low EvbRegs.GPTCONB.bit.T3PIN = 1; // Polarity of GP Timer 4 Compare = Active high EvbRegs.GPTCONB.bit.T4PIN = 2; // Enable compare for PWM7-PWM12 EvbRegs.CMPR4 = 0x0C00; EvbRegs.CMPR5 = 0x3C00; EvbRegs.CMPR6 = 0xFC00; // Compare action control. Action that takes place // on a cmpare event // output pin 1 CMPR4 - active high // output pin 2 CMPR4 - active low // output pin 3 CMPR5 - active high // output pin 4 CMPR5 - active low // output pin 5 CMPR6 - active high // output pin 6 CMPR6 - active low EvbRegs.ACTRB.all = 0x0666; EvbRegs.DBTCONB.all = 0x0000; // Disable deadband EvbRegs.COMCONB.all = 0xA600; } // No ISR's used in this example //=========================================================================== // No more. //===========================================================================