It is possible to use pin 7 to have a better synchronized communication between the linux and leonardo part of the yun.
Basically the arduino can "know" whether the linux is up and running or not based on reading pin 7. This makes for lots easier startup code.
However this makes pin 7 less available for shields (there are some work arounds thinkable) .
A -relatively simple- solution on how to do this is described at http://forum.arduino.cc/index.php?topic=324304.msg2240385#msg2240385
If there is an interest in this I'm willing to make a pull request.
Best regards
Jantje
gandarez
commented
9 years ago
It is possible to use pin 7 to have a better synchronized communication between the linux and leonardo part of the yun. Basically the arduino can "know" whether the linux is up and running or not based on reading pin 7. This makes for lots easier startup code. However this makes pin 7 less available for shields (there are some work arounds thinkable) . A -relatively simple- solution on how to do this is described at http://forum.arduino.cc/index.php?topic=324304.msg2240385#msg2240385 If there is an interest in this I'm willing to make a pull request. Best regards Jantje