PWM generation

Hi,

You can use this code:

//--------------- Configuration pin as PWM ---------------

	EALLOW;

	// Enable pull-up on GPIO0 (EPWM1A)
	GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0;

	// Configure GPIO0 as EPWM1A
	GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;

	EDIS;


	//--------------- Configuration for PWM module ---------------

	EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;    // Disable phase loading
	EPwm1Regs.TBPHS.half.TBPHS = 0x0000;       // Phase is 0

	// Counter mode
	EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up

	// Configuration clock for PWM1
	EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV2;
	EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV2;		// TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV) = 37.5MHz

	// Set up period
	EPwm1Regs.TBPRD = 1874;       		// PWM period (frequency) = TBCLK / (TBPRD + 1 )  = 20KHz

	// Setup shadow register load on ZERO
	EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
	EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;

	// Set actions
	EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET;            // Set PWM1A on Zero
	EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR;          // Clear PWM1A on event A, up count

	// Set initial compare values
    EPwm1Regs.CMPA.half.CMPA = 0;

But I think you should read reference guide to understand. They are very clear.

Thanks

Hi Hari,

I would like you to download controlSuite. It has all the example codes on PWM implementation. You simply have to import the project.

Do let us know if you face any issues while implementing.

Regards,

Gautam

Thank you Phien Nguyen !!! this code generates a normal pwm wave.. can you suggest one for generating sinusoidal pwm?

Hi Gautam, 

Thanks.,

I have installed control suite and working on it! i would like to generate a sinusoidal pwm wave (spwm) .

Regards,

Hari

Thank you Gautam for the doc! It helped me!

That's great!

Goodluck & Regards,

Gautam