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ArduinoISP, PIN_MISO keeps the PULL_UP enabled after finish #33

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@deulis

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@deulis

Using ArduinoISP, when programming is over the PIN_MISO remain with the PULL_UP enable. This can interfere with other SPI devices connected at the same time on the SPI bus (as it happened in my case).

My solution was to add:
pinMode(PIN_MISO, INPUT);
in the end_pmode() method.

I recommend to add this line in the official ArduinoISP sketch.

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type: imperfectionPerceived defect in any part of project

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