USB driver on µclinux to communucation with PC with USB

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But please note that these chips are among the group that we've been told are going away.

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I suggest using a Microchip PIC24 chip for this. It's cheap, needs only very little power, has a built-in USB OTG MAC and Phy, comes with Software for USB host and device, provides SPI master and slave in hardware to connect to the Linux system, and comes with (e.g.) "USB-serial" "driver" (a simple text file) for Windows.

They also have a pre-programmed USB-Serial chip but IMHO SPI is more appropriate for this purpose and being able to implement some of your own software functions in the interface chip often makes a lot of sense. Of course there is much more stuff you can use this chip for:

- System Watchdog (it provides it's own internal hardware watchdog)

- Analogue input (at least watching the power supply always makes sense)

- providing low level device history statistics

- multiple UARTs

- System udate (reprogram the SPI Flash chips (for FPGA content and/or Linux boot

- ...

-Michael (we are using PIC24 in that way)