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Topic: Turn M0 Pro into Zero (Read 120 times) previous topic - next topic


Feb 09, 2018, 06:39 pm Last Edit: Feb 10, 2018, 11:38 am by paulsoulsby
I have a project that uses a Zero. Now they are becoming harder to find I bought an M0 Pro and did the following to turn it into a Zero:

1)  Select Zero in IDE and burn bootloader onto the M0 Pro

2)  Wire up the ATN pin by adding this wire:

3)  Add this code to swap pins 2 and 4:
Code: [Select]
#define M0PRO_PINSWAP(pin) (((pin)==2||(pin)==4) ? (6-(pin)) : (pin))
#define M0PRO_PINSWAP(pin) (pin)

Be sure to define ARDUINO_SAMD_M0_PRO somewhere!  Then wrap any code using D2 or D4 with M0PRO_PINSWAP.

4) Remove the 2 I2C pull-ups that aren't populated on the Zero.

If anyone can spot any other differences, let me know!


Hello Paul

Thanks for this, I got an M0PRO as well and I'm interested !

By the way could you explain how to use your code to invert D2 / D4 ?

Once these modifications are done, can we consider the M0PRO fully compatible with Zero sketches ?

In particular Timers Vs Pin mapping ?

Many thanks


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