FTDI implements standard CDC protocol?

Question

Does FTDI implement the standard communications device class (CDC) USB protocol?

I need to implement a host on the STM32 to connect the device to an FTDI serial chip. But searches on Google say that when using a library from ST there are problems.

Answer 1

No, they don't implement the common CDC class. Their chips return class and subclass set to 0 with vendor ID 0x0403. On PC this is a separate driver handling this communication.

You can confirm this for example by checking linux sources here: https://github.com/torvalds/linux/blob/master/drivers/usb/serial/ftdi_sio.h