The CP210x is an USB-to-serial chip used in a lot of USB devices (similar to FTDIs and PL2303). The CP210x has a EEPROM on the chip which can be. Jan 04, 2017  The OTPROM can be programmed twice using the Prolific PL2303 EEPROM Writer utility software which can be requested from Prolific or authorized distributors. Click to expand. So if you can get an adapter with a real PL2303 chip and a copy of the software.

Hi for custome PID/VID you need to purchase it from some companies sell PID within it's VID for much less price just serch the web If you need to edit you discreptors you need to understand the USB specs or use ready made tools from USB.org you can find some helpful tool If you need to build a driver Compuware have a program to help developing drivers. Or you need to study 'Windows Driver model' BOOK you can find it here in EDAborad if your device is HID, you just need to know how to interface with hid.dll of windows,you can many programs source code doing that Salam Hossam Alzomor. Obtaining a 'free' VID/PID combination is not really a problem, since I can buy a VID/PID combination through. I don't want it in my application to be detected as a 'standard' USB-to-serial adaptor, especially since I want to use more than one of these devices on the same bus.

The PL2303 is a standard USB-to-serial converter which has a default VID/PID. If an external EEPROM is connected, a custom VID/PID can be set. The problem is that no information is available about the contents of this EEPROM. A software tool called 'EEPROM Writer Program' is available to program this EEPROM through the PL2303 itself, but I cannot find this tool anywhere. In the past, it was freely available on the manufacturers website, but now not anymore.

HI, OK, I have spent quite a while with this now and I can confirm that my laptop and desktop are both doing the same thing. I programmed a chip (16F628A) without code protection using MPLAB and PicKit 3. The chip programmed and verified. I then read the chip using your software and board - the read looked good as far as I can tell.

Using a second chip I erased it and then attempted to program it using the code I had just read from the mplab programmed chip. It generated the error at the end indicating that the EEPROM had a problem.

Using the laptop and desktop side by side I can confirm that the flash code looks good but the EEPROM has not programmed correctly - exactly as the error reported. I also tried it with a different USB cable on the laptop, result was exactly as above. If you are able to read the devices ok then this narrows it down to a programming issue. From the information you have given us you have managed to rule out a lot of possibilities and so you may want to consider returning it back to us for testing. If you decide to do this please email us a sales @ hobbycomponents.com referencing your order number and will provide you with information and terms on how to return it back to us. If the board is faulty we can cover return postage fees. If you don't want to return it just yet, and you have a multimeter, you could try to measure the RA5/MCLR/VPP pin whilst the device is being programmed to see if it is at the correct voltage.