Tibbo DS10x0, Programmable Hardware Manual

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508 Companion Products
© Tibbo Technology Inc.
10 CLK SPI port, clock (input*).
* Of the WA2000.
The UART of the WA2000 is currently unused but may be enabled in the future.
Connecting WA2000 to Tibbo Devices
The WA2000 communicates with Tibbo devices through an SPI interface . Five
interface lines are involved:
·
CS
–
chip select;
·
CLK
–
clock;
·
DI
–
data in (must be connected to the DO line of the host);
·
DO
–
data out (must be connected to DI line of the host);
·
RST
–
reset.
Most Tibbo devices that can work with the WA2000 allow remapping of CS, CLK, DI,
and DO lines. This is done through
wln.csmap , wln.clkmap , wln.dimap , and
wln.domap properties of the Wi-Fi (wln.) object. The only exception is the EM510
device, which has a fixed set of GPIO lines for interfacing to the WA2000.
The wln. object does not automatically configure these interface lines as inputs or
outputs, this is the responsibility of your Tibbo BASIC/C application. To allow the
proper communications with the WA2000, configure the following lines as outputs:
CS, CLK, DO, and RST.
The wln. object works with these four interface lines: CS, CLK, DI, and DO. The RST
line is not directly controlled by the wln. object, so providing a proper hardware
reset is your application's responsibility. Any suitable GPIO line can be connected to
the RST line. To reset the WA2000, set the RST line LOW, wait for 1 ms, then set
the line HIGH.
Special case -- the EM510
The diagram below shows how to connect the WA2000 to the EM510 module. GPIO
lines are a precious commodity on the EM510 — there are only eight of them
available. You get away with using only three lines to control the WA2000 (against
the standard five lines).
The EM510 does not allow remapping of WA2000 lines, so the line assignment shown
below cannot be changed.