Difference between revisions of "Toggling an External Pin on the Imote2"
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This maps the red LED control pin to be GPIO 94, which is exposed as pin 14 of J7 as shown on page 5 of [[media:Intel.ITS400.DataSheet.pdf|Imote2 engineering manual]]. | This maps the red LED control pin to be GPIO 94, which is exposed as pin 14 of J7 as shown on page 5 of [[media:Intel.ITS400.DataSheet.pdf|Imote2 engineering manual]]. | ||
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| + | When measuring the voltage of pin 14, it is high when red is off and low when red is on. | ||
Revision as of 23:17, 22 September 2008
Sometimes toggling an external pin is useful when evaluating an Imote2. By toggling this pin at certain intervals, an oscilloscope can be used to measure the latency of an operation. The following instructions describe how to toggle pin 14 of interface J7 via the Leds.redOn and Leds.redOff interface.
Open the following file:
$TOSROOT/tos/platforms/imote2/hardware.h
One line 141, change 103 to be 94.
This maps the red LED control pin to be GPIO 94, which is exposed as pin 14 of J7 as shown on page 5 of Imote2 engineering manual.
When measuring the voltage of pin 14, it is high when red is off and low when red is on.
