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36
Embedded Modules
© Tibbo Technology Inc.
Each I/O line has a weak pull-up resistor that prevents the line from floating when
the output buffer is tri-stated.
I/O line control is described in detail in the documentation for the I/O (io.) object
found inside the TIDE, TiOS, Tibbo BASIC, and Tibbo C Manual.
4.2.2.2
Wireless Add-on Port
The wireless add-on port (a.k.a. "SPI port") of the EM1000 is a separate 10-pin
connector.
This port carries 5
. When a wireless add-on module, such
as the
, is plugged into the EM1000, these lines are used for SPI
communications with the add-on. In the absence of a wireless module these 5 lines
may be used as general-purpose input/output lines.
It should be noted that wireless add-ons can be controlled through any five I/O
lines of the EM1000. Obviously, the lines on the wireless add-on port are the most
convenient for the task as the connector pinout matches that of the WA2000.
Nonetheless, it is always possible to connect the WA2000 by wires, in which case
any combination of I/O lines can be used for communicating with it.
The wireless add-on port also carries three legacy lines SPIDI, SPIDO, and SPOCLK.
These lines are not used by wireless add-on devices and should never be connected
to.
For more details on Wi-Fi communications see TIDE, TiOS, Tibbo BASIC, and Tibbo C
Manual (wln. object).
EM1000 versions and the wireless add-on port
Standard EM1000 devices do not have the wireless add-on port connector and the
"landing" PCB area for the connector is left empty.
Wireless add-on modules, such as the
, may be soldered into the wireless
add-on port pads on the EM1000. Tibbo will solder the WA2000 in if you order the
"EM1000Nx" device.
Option "-A" EM1000 devices feature a 10-pin wireless add-on pin header. The pins
on this header are identical to all other pins on the EM1000 and face the host PCB.
This way the wireless port of the EM1000 can be connected to some other circuitry
on the host PCB. For example, instead of mounting onto the EM1000, the WA2000
can be mounted directly onto the host PCB. Option "-A" EM1000 module is then
required to facilitate the connection between the EM1000 and the WA2000.