Configuration descriptor length vs max packet size

[DaveB]

Hi,

I have a config desc length of 67 bytes and the paket size for EP0 is 64 bytes.

I send the initial config desc 9 bytes when requsted and this contains the wTotalLenth field indicating 67 (bytes). The host gets this okay.

Now, what I cannot figure out is:

Does the host send multiple requests for the entire config desc (i.e. first request 64 bytes then 3 bytes) creating two interrupts,
OR
does it just request 67 bytes and I have to send two consecutive packets?

Thanks

[Jan Axelson]

One Get_descriptor request no matter how long the descriptor is.

If the Data stage has more data that will fit in one transaction, the stage uses multiple transactions (data packets).

Jan

[DaveB]

Thanks for your speedy reply Jan.