usb device listener
Hello Niver,
The CATA analyzer can fullfill your demand easily, but if you prefer a home-made one.... To be honest, it's not easy at all, as I know. In my idea, it is just a listener to the USB bus for this analyzer, such that the output enable signal of USB Tx must be disable. In this manner, the Tx can receive all situation on the bus, but the response will not affect the bus 'cause of it's disable. Then the normal sie and backend logic can run well like the normal way. Philips, Cypress provide lots of MCU w/ USB interface, of course, w/ UART for RS-232. But I really have no idea how to disable the pin I mentioned above to make this kind of MCU as a linstener. In the attached application note, it shows one MCU is able to connect Tx directly, it might be helpful to you.