Rabbit 2000 - Page 33

28 Rabbit 2000 Development Kit
int serXrdFree ( );
Calculates the free space in the serial port receive buffer.
Parameters
None
Return Value
The number of characters the serial port receive buffer can accept before becoming full.
int serXwrFree ( );
Calculates the free space in the serial port transmit buffer.
Parameters
None
Return Value
The number of characters the serial port transmit buffer can accept before becoming full.
int serXrdUsed ( );
Calculates the number of characters ready to read from the serial port receive buffer.
Parameters
None
Return Value
The number of characters currently in the serial port receive buffer.