TMS570LC4357: Facing issue during HET Capuure mode

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Tool/software:

Dear Sir

Dear Team,

I am currently working on pulse capture using the TMS570LC4357 microcontroller, and I am using HET2_0 and HET2_2 as capture pins. My goal is to capture a pulse with a period of 1000 µs.

I have configured the capture functionality in HALCoGen, and I have attached the relevant configuration screenshots for your reference.

However, I am observing the following issues during runtime:

• The measured period value fluctuates slightly — sometimes it reads as 1049 µs.

• When the input pulse is turned off or disconnected, the last measured period value remains unchanged, instead of being reset or updated.

I would appreciate your guidance on:

1. How to handle the case where the pulse input is no longer present — i.e., how to reset or detect the absence of signal?

2. Any suggestions to improve the accuracy of the period measurement or filtering techniques to avoid noise or fluctuations?

The Function Which i was called in the loop 

capGetSignal(hetRAM2,cap0,&tz_Chopper1_Feedback);
capGetSignal(hetRAM2,cap2,&tz_Chopper2_Feedback);