Why PD6?

[jirkaptr]

When using a programmer made from ARDUINO UNO, NANO and possibly LEONARDO it would be convenient to use the connector originally designed for ICSP. For this case it would be necessary to use one of the terminals MISO, MOSI, SCK instead of PD6. What conditions would have to be met?
Will the modification of the https://github.com/ElTangas/jtag2updi/blob/master/source/sys.h file meet all requirements?

[ElTangas]

You can change the default values to others, if you prefer.

[homer1013]

**I also had this question and started digging in to the code.

I have changed from Pin 6 (PD6) to Pin 11 (PB3) in order to utilize the ICSP pin header.

If you'd like to do so also, go to the "sys.h" file and find the arduino family for your project, ie. Arduino Uno R3 (ATmega328 P)

For my example I am using an Uno R3, see below for what's changed.**

#elif defined (AVR_ATmega_Mini) || defined(ARDUINO_AVR_LARDU_328E)
//For ATmega8/88/168/328 (P, PB) parts

ifndef HVLED_PORT

define HVLED_PORT B

endif

ifndef HVLED_PIN

define HVLED_PIN 0

endif

ifndef HOST_USART

define HOST_USART 0

endif

ifndef UPDI_PORT

define UPDI_PORT B // Pin 11 (PB3) ADDED

define UPDI_PORT D // Pin 6 (PD6) ORIGINAL

endif

ifndef UPDI_PIN

define UPDI_PIN 3 // Pin 11 (PB3) ADDED

define UPDI_PIN 6 // Pin 6 (PD6) ORIGINAL

endif

**I removed the (#)'s for this comment only, Be sure to replace the (#)'s before uploading code

I hope this helps out anyone stuck right now
-Homer**