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Stlink CDC ACM packet latency

Question asked by Uwe Bonnes on Jan 21, 2016

it seems that the Stlink CDC ACM implementation only sends out RX packet to the PC if the RX buffer is either full or after a delay of 100 ms. The delay when sending non-full RX packets is enourmous and slows down "send message" <-> "expect response" setups extrem. Is this delay settable somehow?

E.g. the FTDI implementation exports an API to set and read this latency.