following suggestion by @kasjer
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@@ -413,7 +413,7 @@ bool cdcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
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// Though maybe the baudrate is not really important !!!
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if ( ep_addr == p_cdc->ep_in )
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{
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if ( xferred_bytes && (0 == (xferred_bytes % CFG_TUD_CDC_EPSIZE)) ) usbd_edpt_xfer(TUD_OPT_RHPORT, p_cdc->ep_in, NULL, 0);
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if ( xferred_bytes && (0 == (xferred_bytes % CFG_TUD_CDC_EPSIZE)) && (0 == p_cdc->tx_ff.count) ) usbd_edpt_xfer(TUD_OPT_RHPORT, p_cdc->ep_in, NULL, 0);
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}
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// nothing to do with notif endpoint for now
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