Topics

We have a board with an NXP processor and an FTDI USB/UART chip. We designed it so that we could use FlashMagic to program the board using the handshake signals, and it works. The problem is, we do not want our board to reset every time the virtual com port is opened in software (other than FlashMagic) the first time after it has been plugged into the computer (DTR and RTS settings are retained thereafter, so it only affects the first open, but they are initially asserted on that first opening). Anyone know how to change this? I can't find anything on the web and so far FTDI has not been helpful. Their application note tells you how to disable the handshaking assertion when the device is first plugged in, but that setting does not change the behavior when the COM port is first opened up.