how to generate 2 pwms

Loilin,

Are you trying to generate two independent PWM signals or perhaps a complementary pair?

Regards,
Daniel

I want to generate two separate pwms. One that is at 500khz frequency and another at the same frequency but phase shifted.

Thanks,

Loilin Muirhead

Loilin,

Why don't you try looking at the epwm_up_aq or epwm_updown_aq examples instead?

Also, you should look at SPRUG04, specifically the TBPHS register.

Regards,
Daniel

Daniel,

I try to drive Brushless DC motors with F28335 based on EpwmDeadBand.c example. When I connect my DSP to motor, motor can turn less than 1 sec and stop.

What could be problem, can you help me?

Thanks.

Hi everyone, I try to understand how do i configure ePWMs, the frecuency one is 10KHz and the other one is 500 Khz,  how do i configure that in a tmds28027usb microcontroller  , why when i configure the frecuency one at 10 Khz i have to put the register one "EPwm1Regs.TBPRD=3000", and Why i have to put " EPwm1Regs.half.CMPA =2010;"  <==  to set the dut cycle to 33%  ¿Why?, in wich documentation i can find this, i have some examples of my course in the university but i have not found why the register  is to set " EPwm1Regs.half.CMPA =2010;"   to set the duty cycle at 33%  ¿Why? i must be put to "2010"??, help me please, thanks and Regards..

Hi Mileva!

At first I would recommend you to install controlSUITE. You can find there many the example projects with using ePWM and documentation also (for example in folder  ti\controlSUITE\device_support\f2802x\v210). Further if you will have any question then you might create own post.

Regards,

Igor 

Hi Mileva,

Here is the documentation which will solve all your queries on PWMs:

http://www.ti.com/lit/ug/spruge9e/spruge9e.pdf

The above documentation will give you the formula by which you'll be able to calculate the PWM period using SYSCLK and LSPCLK.

Regards,

Gautam

 Hi Igor, i'll take a look, really  thanks..

Hi Gautam, i'll take a look, really  thanks..