Ø I don't know if it effects MPSSE mode but you might check the latency timer.
The latency timer tries to avoid partial data packets by waiting for more data
to show up before transmitting. If you partially fill the buffer it waits for
the timer (default is 16ms at least for FT232R) to expire before sending the
packet.
You should be able to use ftdi_get_latency_timer() with a valid context and
byte sized variable to get the timer in ms.
Is this related to the ftdi_set_latency_timer, in both of my examples I set it
to 2
status = ftdi_write_data_set_chunksize(fc, 512);
status = ftdi_set_interface(fc, 0);
status = ftdi_usb_reset(fc);
status = ftdi_set_latency_timer(fc, 2);
status = ftdi_setflowctrl(fc, SIO_RTS_CTS_HS);
status = ftdi_set_bitmode(fc, 0, BITMODE_MPSSE);
status = ftdi_usb_purge_buffers(fc);
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