Wireless Add-on Port
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The wireless add-on port (a.k.a. "SPI port") of the EM1000 is a separate 10-pin connector.
This port carries 5 general-purpose I/O lines. When a wireless add-on module, such as the GA1000 Wi-Fi add-on, 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 the GA1000 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 GA1000. Nonetheless, it is always possible to connect the GA1000 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 and Tibbo BASIC 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 GA1000, may be soldered into the wireless add-on port pads on the EM1000. Tibbo will solder the GA1000 in if you order the "EM1000G" 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 GA1000 can be mounted directly onto the host PCB. Option "-A" EM1000 module is then required to facilitate the connection between the EM1000 and the GA1000.
Finally, option "-T" devices have a female wireless add-on port connector, which the GA1000 can be plugged into. EM1000 modules of "-T" variety are intended for convenient GA1000 testing and are not recommended for use in production devices.