mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-17 10:38:05 +11:00
17 lines
912 B
Markdown
17 lines
912 B
Markdown
|
# AVR include files
|
||
|
|
|
||
|
|
This folder contains header files that can be included in AVR assembly code.
|
||
|
|
|
||
|
|
These definitions are organized in a manner that is very similar to other
|
||
|
|
modern AVR assemblers, but most bits definitions (`PINB4`, `WGM01`, etc.) are
|
||
|
|
absent. This is because there's a lot of them, each symbol takes memory during
|
||
|
|
assembly and machines doing the assembling might be tight in memory. AVR code
|
||
|
|
post collapse will have to take the habit of using numerical masks accompanied
|
||
|
|
by comments describing associated symbols.
|
||
|
|
|
||
|
|
To avoid repeats, those includes are organized in 3 levels. First, there's the
|
||
|
|
`avr.h` file containing definitions common to all AVR models. Then, there's the
|
||
|
|
"family" file containing definitions common to a "family" (for example, the
|
||
|
|
ATtiny 25/45/85). Those definitions are the beefiests. Then, there's the exact
|
||
|
|
model file, which will typically contain RAM and Flash boundaries.
|