Hi Noralf, Noralf Trønnes wrote: > I would like to keep the SET_BUFFER request since it will serve as a > syncing point between the host and the device. I'm no USB expert but I > assume that a bulk transfer can fail halfway through and result in the > next update starting where the previous one failed and thus writing > beyond the end of the display buffer. Transfers either succeed completely (possibly after many retries), time out (after zero or more transfered bytes) or fail catastrophically (e.g. from device disconnect). In all cases, the driver on the host knows/has available how many bytes were successfully transfered. //Peter
