I have created a frequency counter on the PSoC 3 evaluation kit. Please refer following github repository.
This project was developed on PSoC Creator 3.3 SP 2.3 So many components must be updated.
Following is a BLOG entry describing the project written in Japanese. Please refer this page too.
Please have a look at the following document: Frequency measurement using Counter in PSoC 3 / PSoC 5
The above project is used for measuring frequency of square wave. When the input is of some other waveform that does not have a rising edge (for example, sine wave or ramp), you must convert the input wave to square wave before giving it to the counter. The other waveforms can be converted to square wave using a comparator.
Also if possible can you please share your project.