This works on an Uno:
uint8_t x = PINB;
What is the equivalent for the Uno WiFi Rev 2 (ATmega4809 microcontroller)?
PINB doesn't seem to be defined.
The ATmega4809 have ports A, C, D and F. You don't have them in one row on the header as pin 8 to 13 as you have PINB on the UNO.
I'm fine with reading out of multiple ports and all the bit manipulation funtions but what is the low level read command to get a port on the Uno WiFi Rev 2?
what is the low level read command to get a port on the Uno WiFi Rev 2?
x = VPORTB.IN;
Note that the board-level pins are quite scrambled. While an Uno can read pins 0..7 in order as PORTD, reading pins 0..7 on an Uno WiFi 2 requires reading 4 separate ports and fiddling with bits.
The Arduino core for Mega0 chips has "Port emulation", where if you enable it and say x = PINB;, the multiple reads and bit twiddling will all be done for you. But if your goal was speed, it's PROBABLY not the way you to go.
Great! That's what I was looking for. Can you give me a pointer to enabling Port Emulation as well?
An option "Registers optimization" shows up in the "Tools" menu after selecting a Board type that has the 4809.
I believe "Emulation On" is the default.
If you try to use it, you'll get the warning (which may scroll past unnoticed):
/Applications/Arduino-1.8.13.app/Contents/Java/portable/packages/arduino/hardware/megaavr/1.8.7/cores/arduino/UNO_compat.cpp:20:2: warning: #warning "ATMEGA328 registers emulation is enabled. You may encounter some speed issue. Please consider to disable it in the Tools menu" [-Wcpp]
#warning "ATMEGA328 registers emulation is enabled. You may encounter some speed issue. Please consider to disable it in the Tools menu"
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