Who can send me a source code of Demo Firmware(cyfxuvc.img) in the website http://www.cypress.com/?rID=72599.
It is clearly stated that you should contact Cypress and showing up an NDA. So it looks a bit as if it will not be allowed for anyone except Cypress to provide you with the code.
You can check out the source code of the AN75779 example project (http://www.cypress.com/?rID=62824).
It has all the details about the FX3 firmware for such an interface. However, it does not have the sensor config settings in the firmware. If you need this, you need to create a Tech Support case on our website. And you would need to have a NDA with Aptina.