The project with serial number 12 named Pioneer Board oscilloscope from the link below may help you. This code example is for PSoC 4.
If you are using PSoC 3/5 the following code example might help you.
Kindly update if you need more information after going through the above documentation.
I am using CY8CKIT-050 PSOC 5LP. In this kit How to read a voltage from psoc and viceversa.
Please share a psoc project which will use USBUART style of project.
Kindly check the PSoC Code examples available in PSoC Creator. In PSoC Creator, Go to FIle -> Code example. Inside that check for CE195277(ADC and UART) example available .