more update to host serial API
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@@ -138,7 +138,8 @@ bool tuh_cdc_read_clear (uint8_t idx);
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// - If complete_cb is provided, the function will return immediately and invoke
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// the callback when request is complete.
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// - If complete_cb is NULL, the function will block until request is complete.
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// In this case, user_data should be pointed to xfer_result_t to hold the transfer result.
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// - In this case, user_data should be pointed to xfer_result_t to hold the transfer result.
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// - The function will return true if transfer is successful, false otherwise.
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//--------------------------------------------------------------------+
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// Request to Set Control Line State: DTR (bit 0), RTS (bit 1)
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