Arduino Zero - accessing registers on the Atmel SAMD21

Hardware Arduino Zero
22

Thanks MartinL!

Adding the following line to the setup() function in the sketch in my post: http://forum.arduino/index.php?topic=339470.msg2422343#msg2422343 solved the problem of writing to the AC registers. :slight_smile:

REG_PM_APBCMASK |= PM_APBCMASK_AC; // Set the AC bit in the APBCMASK register

Now I can use this piece of valuable information to develop interrupt triggers based on the two ACs in the M0 PRO/Zero.

Harry J. Whitlow