ComXmitting

ComXmitting tests for transmit active on the specified port. This function is useful to insure that all buffered data has been transmitted by the UART before issuing a ComClose. It may also be used to implement a "graceful" close and/or to implement half duplex communications.


Syntax:      int far ComXmitting(handle_t Handle) 
Parameters:  handle_t Handle - The handle returned via a successful ComOpen. 
Returns:     0 - if there is no data queued for transmission and the UART 
                 transmitter is currently idle 
             Non-zero value - if data is queued for transmission (but flow control may
                              be preventing transmission), or if the UART is actually
                              transmitting a character
Comments:    ComOpen() must first be called in order to get a valid handle to the 
             communications port.