The current ISR implementation for AVR8 requires use of
avr8_[enter/exit]_isr pair which add some boilerplate on code.
This add AVR8_ISR which clean-up the code and make it simpler
and hides any schedule detail from the user perspective.
This is a preparation for future scheduling and irq optimizations.
Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
The avr8_state variable uses bit operation to set/clear the state. This
rework avr8_state to use increment/decrement instead. It introduce the
use of General Purpose IO Register 1 (GPIOR1) when available.
This is a preparation for future scheduling and irq optimizations.
Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
Split atmega_common code into avr8_common folder. This moves common
avr8 code to be used for all avr8 variants: tiny, mega and xmega.
Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
