ICSP Headers, are they available on the YUN?

Official Hardware Classic Yún
1

Hey, I'm new here and new to all the Arduino stuff XD

Recently I decided to start on my own project to create some mood lights for my rooms and found a cool library that allows the Arduino to control 10's of LED's with PWM just using either 3 Digital pins or the ICSP headers.

The library states that using digital pins would make it run very slow and not that efficient, so I immediately set out to use the ICSP headers.

My question is, as stated in the title :P, are they available for use? or are they occupied by the Linux processor?

Sorry if it's a dumb question, but the YUN's Wifi capabilities are a must! haha. Thanks!

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Thanks for the picture, I knew where they were haha. Problem is will they work? or are they being used by something else on the yun?

4

Problem is will they work? or are they being used by something else on the yun?

they work both way extenal programmer as well as direct connect AR9331 use linino as programmer .

NTB0104UK is tri-state as long as GP21 is low, it is safe to use extenal programmer.

linino as programmer

5

Awesome!

So if I had to use this library "http://www.elcojacobs.com/using-shiftpwm-to-control-rgb-leds-with-arduino/" and connect the Clock and Data pins to SCK and MOSI pins respectively, the library would work as long as GP21 on the Linux CPU is low. Correct?

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GP21 default is low, only high while use as internal programmer.

#!/bin/sh

echo 1 > /sys/class/gpio/gpio21/value
avrdude -c linuxgpio -C /etc/avrdude.conf -p m32u4 -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xCB:m -Uflash:w:$1:i $2
echo 0 > /sys/class/gpio/gpio21/value
7

Thanks!