Memos From the Cube

Eagle-eyed observers will notice that the Mass Storage demonstration is no longer listed as incomplete on the MyUSB page of my Website. That’s because I finally got it operational last night, after some shifting around of the pipe freezing for the data pipes. I’m not entirely convinced that this is a fix rather than a mask for the problem, so I’ll be looking into the correct way of recovering from Device NAKs this week.

The Mass Storage demo is designed to be a basic example, so there’s no FAT handling code – it will just read and write blocks of data from and to the device with no respect for any existing filesystem. The write and read routines are seperate however with useful parameters, so chances are they could be slotted into an existing file system driver.

I’ve had an email requesting I look into the Test And Measurement USB device class, which I’ll also be doing this week. Sounds interesting (and related to the kinds of end-applications for MyUSB) and I’ve not heard of it before, so I’m keen to investigate.