Rabbit RabbitCore RCM4400W Product Manual - page 113

OEM User’s Manual

105

RS-232 flow control on an RS-232 port is initiated in software using the 

serXflowcon-

trolOn

 function call from 

RS232.LIB

, where 

X

 is the serial port (C or D). The locations 

of the flow control lines are specified using a set of five macros.

SERX_RTS_PORT

—Data register for the parallel port that the RTS line is on (e.g., PCDR).

SERA_RTS_SHADOW

—Shadow register for the RTS line's parallel port (e.g., PCDRShadow).

SERA_RTS_BIT

—The bit number for the RTS line.

SERA_CTS_PORT

—Data register for the parallel port that the CTS line is on (e.g., PCDRShadow).

SERA_CTS_BIT

—The bit number for the CTS line.

Standard 3-wire RS-232 communication using Serial Ports C and D is illustrated in the 

following sample code.

#define CINBUFSIZE  15   // set size of circular buffers in bytes

#define COUTBUFSIZE 15

#define DINBUFSIZE  15

#define DOUTBUFSIZE 15

#define MYBAUD 115200   // set baud rate

#endif

main(){

    serCopen(_MYBAUD);   // open Serial Ports C and D

    serDopen(_MYBAUD);

    serCwrFlush();       // flush their input and transmit buffers

    serCrdFlush();

    serDwrFlush();

    serDrdFlush();

    serCclose(_MYBAUD);  // close Serial Ports C and D

    serDclose(_MYBAUD);

}