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3.1.2 RS-232 Serial Communication Sample Programs
? JR_FLOWCONTROL.C —This program demonstrates hardware flow control by config-
uring Serial Port C (PC3/PC2) for CTS/RTS with serial data coming from TxB at
115,200 bps. One character at a time is received and is displayed in the STDIO window.
To set up the Prototyping Board, you will need to tie PC4 and PC5 (TxB
and RxB) together at header J1, and you will also tie PC2 and PC3 (TxC
GND
and RxC) together as shown in the diagram.
A repeating triangular pattern should print out in the STDIO window. The
TxC
RxC
J1
RxB
TxB
program will periodically switch flow control on or off to demonstrate
the effect of no flow control.
Refer to the serBflowcontrolOn() function call in the Dynamic C Function Refer-
ence Manual for a general description on how to set up flow control lines.
? JR_PARITY.C —This program demonstrates the use of parity modes by
repeatedly sending byte values 0–127 from Serial Port B to Serial Port C.
GND
The program will switch between generating parity or not on Serial Port
B. Serial Port C will always be checking parity, so parity errors should
occur during every other sequence.
TxC
RxC
J1
RxB
TxB
To set up the Prototyping Board, you will need to tie PC4 and PC3 (TxB and RxC)
together at header J1 as shown in the diagram.
The Dynamic C STDIO window will display the error sequence.
24
Rabbit 2000 Development Kit
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