Example_281xEvPwm.c
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- //###########################################################################
- //
- // 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.
- //===========================================================================