PORTS Forum

Ports and Interfaces => USB => Topic started by: jbrady on August 04, 2010, 05:50:37 pm

Title: Mass storage chip
Post by: jbrady on August 04, 2010, 05:50:37 pm

Hello -----

I am thinking about designing a small data-logger with USB that appears like a flash drive when you plug it into a PC.  For simplicity, I do not want to make users install a USB driver on the PC, but rather use the standard Windows mass storage driver, I think it is usbstor.sys

I have used FTDI parts like the FT232 before but don't think they can work like this - you need to install one of their drivers. So does anyone know of a fairly low cost solution, like a chip or chip+stack to do this ?

Jim

Title: Re: Mass storage chip
Post by: Jan Axelson on August 04, 2010, 10:37:01 pm

My mass storage page has links to chips, reference designs, and firmware stacks:

http://www.lvr.com/mass_storage.htm#Devices

I can't think of anything offhand that isolates you from the protocols as FTDI's chips do.

To prevent problems, disable data logging when the drive is attached to a USB host.

Another option would be to use a host module like the USBwiz or Vinculum with a flash drive that users move between the logger and the PC.

Jan

Title: Re: Mass storage chip
Post by: Jan Axelson on August 05, 2010, 10:50:51 am

Also - Microchip's Applications Library includes a USB mass storage data logger application.

Jan