[ECOS] Splitting USB-Packets

[Fuchs, Torsten]

Hi,

I need to send or receive large amounts of data via USB using the usbs slave. The data sizes can under certain circumstances be larger then the RAM in the system so I have to split the data into blocks. From the hosts point of view there shall be only one big USB-packet.

Receiving is not a problem but transmitting. When sending multiples of the maximum packet size (64 Bytes) the device driver generates a zero length packet to end the data transfer. So the host sees an interrupted packet. I need an option to supress the generation of this zero length packet to continue the transmission with another call of usbs_start_tx. Only the last block should be finished with a zero length packet.

Every modification would not be compatible to the slave package so how can I solve this problem? In my opinion there should be an additional flag to enable/ disable the generation of the last packet by the driver.

Thanks
Torsten

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