How to handle USB Isochronous data Transfer?

Subject: How to handle USB Isochronous data Transfer?

From: Nakkala Sivaram Prasad <email@hidden>

Date: Tue, 22 Feb 2005 22:26:16 +0530

Delivered-to: email@hidden

Dear all,

Could anybody suggest how to handle the USB isochronous data transfers.

In case of USB bulk data transfers (USB Bulk Read) we specify the amount of

data to read and the buffer pointer to hold the data. I would like to know how

to read in case of Isochronous data transfer.

In case of USB DDK 1.5.5f (Mac OS 9) we have an API USBIsocRead to read

data from an isochronous pipe. Here I want to read data for certain number of

frames. I am able to supply the starting frame number where actual read should

start and the number of frames the call must be active. How to handle the situation

if i don't want to specify the amount data required? Here intension is to read the

data for certain number of frames without specifying the amount of data required.

Thanks and Regards,

Sivaram Prasad

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