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Reported from github: https://github.com/espressif/esp-idf/issues/1312 https://github.com/espressif/esp-idf/issues/1193 Issues: 1. We used to use event group in the driver, which would cause: a. longer operation time since the event group are based on FreeRTOS timer. b. Operation fails if the timer queue is not long enough. 2. There might be some issue with event group, we will still try to provide a small test code in other branch. modification: 1. use queue instead of event-bit for internal commands 2. use queue overwrite for cmd_done event