TMS320F28068M: How to Measure Level of the input Digital signal.

Yadav,

I think you mean to prior to using the eCAP how do you know the state of the pin if there is no edge, correct?  

You can use the base GPIO function that is embedded in the same signal pin that you have chosen for the eCAP.  Even when a GPIO is commited to a certain mux function the input capture of the pin is always enabled.  This is shown on page 114 of http://www.ti.com/lit/spruh18

For instance eCAP3 is muxed on GPIO9, so you could look at the GPADAT register, bit posistion 9 to determine if the pin is high or low.

Best,

Matthew