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 _endpmode() method.
I recommend to add this line in the official ArduinoISP sketch.
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 _endpmode() method.I recommend to add this line in the official ArduinoISP sketch.