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I am using ePWM1 on the F280049C to control a stepper motor. I am generating a symmetrical 50% duty cycle pulse train because CMPA is always 1/2 of PRD. I need two interrupts, one when CTRU = CMPA and another when CTR = PRD... one at the start of the pulse and one at the end. On page 1868 of the TRM I see that both these signals can generate interrupts and I see that multiple interrupts named EPWMxINTn can be sent to the PIE. So with this information I want to create two interrupts:
Interrupt 1 EPWM1INT0 which occurs every time CTR = PRD
Interrupt 2 EPWM1INT1 which occurs every time CTRU = CMPA.
However when I look at epwm.h, it is beginning to look like you can have only 1 interrupt per PWM module. If this is the case, why does the TRM indicate the name of the interrupt is EPWMxINTn? This implies that for any particular x, such as ePWM1, there can be more than one interrupts generated, such as INT0 and INT1. I think this nomenclature is in error. Am I right?
I have looked at all the ePWM examples in the resource explorer and I don't see anything there that helps.
I am new to TI and this particular processor. If I cannot generate these two interrupts from the event trigger module, can you think of any other way I can generate these two interrupts?
Thinking about this further, I suppose I could use ePWM2 configured identical to ePWM1 and generate one interrupt form ePWM1 and the other from ePWM2 but this seems like a waste of a PWM peripheral. Also, will it be difficult to keep the two PWM exactly synchronized?
Clark
