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Bulk in my experience

Steve,

I have used some of these ARM based controllers and tried this out. It is very simple to setup a bulk based system if it resides on a USB link that is not taxed by other things.

Basically what it comes down to is the buffering on the DAC side of things. What I did was use one of these Atmel AT91SAM7S128 which has 64K of SRAM and 128k or program space. IAR.com has a real nice dev kit for it with C eval and a USB JTAG emulator.

Basically what I did was setup 2 endpoints one bulk and one hid. The bulk would fill the buffer to like 75% then the HID would send a wait to the computer until the buffer would fall below 50% then the HID would send a ready.

This worked pretty well but the ap on the mac side would have needed to be written as a driver.

Is it better? well I guess if I wanted to sit around and write PC code all day. I would say a week of work on the mac and I could have had the driver done. Then what about 6 months before getting the PC to work.

There is not way that I know of to increase the priority of any of the USB devices.

Thanks
Gordon
J. Gordon Rankin

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