Hi all. I don't know in whose area of liability this lies, so I'm writing this to both libusb and libftdi MLs.
Long story short, I'm trying to get a stream of data from an FT2232H and I get a LIBUSB_ERROR_OVERFLOW. (Actually, what I get is an "unknown status 6" string to my stderr, which is defined in ftdi_stream.c:109). This error is present when using both ftdi_readstream and ftdi_read_data. The reason why I am writing this letter is that the libusb documentation says this: >you will never see an overflow if your transfer buffer size is a multiple of >the endpoint's packet size ...and this is exactly what libftdi does: int bufferSize = packetsPerTransfer * ftdi->max_packet_size; (ftdi_stream.c:153) I checked, and the max_packet_size field is populated correctly (as far as lsusb can tell): the chip declares the endpoint's packet size as 512 bytes, and this is what max_packet_size equals to. I found a 5 years old report on a similar problem with another FTDI chip: http://libusb.6.n5.nabble.com/libusb-bulk-transfer-and-overflow-errors-td2802636.html but it sort of ended on nothing. I'm using OpenSuSE 13.2 x64 with 3.16.7-7-desktop kernel, libusb 1.0.19-2.1.2 and the latest version of libftdi (f6ac3c2). Daniil -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
