User’s Manual
21
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IOCONFIG_SWITCHECHO.C
—This program demonstrates how to set up Serial Ports E and F,
which then transmit and then receive an ASCII string when switch S2 or S3 is pressed. The
echoed serial data are displayed in the Dynamic C
STDIO
window.
Note that the I/O lines that carry the Serial Port E and F signals are not the Rabbit 4000
defaults. The Serial Port E and F I/O lines are configured by calling the library function
serE-
Fconfig()
that was generated by the Rabbit 4000
IOCONFIG.EXE
utility program.
Note that the
RCM45_29MHZ_IOCONFIG.LIB
library generated by
IOCONFIG.EXE
to sup-
port this sample program is provided in the Dynamic C
SAMPLES\RCM4500W\SERIAL
folder.
Serial Port E is configured to use Parallel Port E bits PE6 and PE7. These signals are available
on the Prototyping Board's Module Extension Header (header J2).
Serial Port F is configured to use Parallel Port C bits PC2 and PC3. These signals are available
on the Prototyping Board's RS-232 connector (header J4).
Serial Port D is left in its default configuration, using Parallel Port C bits PC0 and PC1. These
signals are available on the Prototyping Board's RS-232 connector (header J4). Serial Port D
transmits and then receives an ASCII string with Serial Port F when switch S3 is pressed.
To set up the Prototyping Board, you will need to tie TxC and
RxD together on the RS-232 header at J4 using the jumpers sup-
plied in the Development Kit; you will also tie TxE (PE6) and
RxE (PE7) together with a soldered wire or with a wire jumper if
you have soldered in the IDC header supplied with the accessory
parts in the Development Kit.
Once you have compiled and run this program, press and release
switches S2 or S3 on the Prototyping Board. The data echoed
between the serial ports will be displayed in the
STDIO
window.
J4
TxC
GND
RxD
TxD
RxC
J2
+3.3 V
/RST_OUT
PE5
PE7
PD1/LN1
PD3/LN3
PD5/LN5
PD7/LN7
VREF
GND
/IORD
PE6
PD0/LN0
PD2/LN2
PD4/LN4
PD6/LN6
CVT
AGND