Does anybody know how to directly access uC registers in arduino code? I need to read/write to 2 registers on the atmega16u2.
thanx, mike
Surely you jest. You can, literally, take examples from the AVR datasheet, paste them into a sketch, and there is a high probability they will compile and work correctly.
The point of the AVR family is to be C / C++ friendly.
if (PORTB == 0) { // read
PORTD = 0; // write
}
but those are in assembler code, and besides, i can't find any in the DS. ATmega8U2 ATmega16U2 ATmega32U2 Datasheet (microchip.com)
yeah but it's not the regular ports i'm trying to access, it's the registers for the analog comparator
https://ww1.microchip.com/downloads/en/DeviceDoc/doc7799.pdf#page=71
Page 71
Access method doesn't change for any register! 
ok i didn't know i could use the regular register labels to do that.
thanx 
This is possible because the definition header is automatically included. 
ok, didn't know that. 
If you look in the Arduino source code you'll see that direct register access is heavily used. That's the great advantage of open-source, its not a secret, once you know to read the source code.
thanx that's a good idea
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