Get the data section of a control transfer. This convenience function is here
to remind you that the data does not start until 8 bytes into the actual
buffer, as the setup packet comes first.
Calling this function only makes sense from a transfer callback function,
or situations where you have already allocated a suitably sized buffer at
transfer->buffer.
\param transfer a transfer
\returns pointer to the first byte of the data section
Get the data section of a control transfer. This convenience function is here to remind you that the data does not start until 8 bytes into the actual buffer, as the setup packet comes first.
Calling this function only makes sense from a transfer callback function, or situations where you have already allocated a suitably sized buffer at transfer->buffer.
\param transfer a transfer \returns pointer to the first byte of the data section