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uart: doc: Add special case for virtual UART

Add virtual UART exception for uart_fifo_fill().

Fixes #11455

Signed-off-by: Andrei Emeltchenko <>
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finikorg authored and nashif committed Apr 11, 2019
1 parent b70ab8f commit cc1b2c70cc8b8db719c82d5524c7b4306427fc01
Showing with 3 additions and 0 deletions.
  1. +3 −0 include/uart.h
@@ -729,6 +729,9 @@ static inline int uart_fifo_fill(struct device *dev, const u8_t *tx_data,
* available data in the FIFO (i.e. until it returns less data
* than was requested).
* Note that the calling context only applies to physical UARTs and
* no to the virtual ones found in USB CDC ACM code.
* @param dev UART device structure.
* @param rx_data Data container.
* @param size Container size.

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