Add Brazilian Portuguese keyboard layout

[samuelstj]

No description provided.

[github-actions]

Memory usage change @ 939d576

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:sam:arduino_due_x_dbg	0 - 0	0.0 - 0.0	N/A	N/A
arduino:samd:mkrzero	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Serial flash	%	examples/Serial RAM for global variables	%
arduino:avr:leonardo	0	0.0	0	0.0
arduino:sam:arduino_due_x_dbg	0	0.0	N/A	N/A
arduino:samd:mkrzero	0	0.0	0	0.0

Click for full report CSV

Board,examples/Serial<br>flash,%,examples/Serial<br>RAM for global variables,%
arduino:avr:leonardo,0,0.0,0,0.0
arduino:sam:arduino_due_x_dbg,0,0.0,N/A,N/A
arduino:samd:mkrzero,0,0.0,0,0.0

[edgar-bonet]

Hello, and thank-you for contributing to this library!

Now, I just learnt that Brazilian keyboards have this extra key, 0x54, which is not present on the ISO physical layout. Unfortunately, the library cannot support adding modifiers to this key. This is because, in this array, bit 6 (0x40) of each cell is used to select between the AltGr and Shift modifiers. C.f. the explanation by the bottom of KeyboardLayout.h.

Fortunately, Wikipedia tells me that:

To make this layout usable with keyboards with only 11 keys in the last row, the rightmost key (/?°) has its functions replicated across the AltGr+Q, AltGr+W, and AltGr+E combinations.

We will have to use these AltGr combinations instead of the key 0x54.

Below are some more comments about specific lines of this pull request:

[github-actions]

Memory usage change @ 7aaa02b

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:sam:arduino_due_x_dbg	0 - 0	0.0 - 0.0	N/A	N/A
arduino:samd:mkrzero	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Serial flash	%	examples/Serial RAM for global variables	%
arduino:avr:leonardo	0	0.0	0	0.0
arduino:sam:arduino_due_x_dbg	0	0.0	N/A	N/A
arduino:samd:mkrzero	0	0.0	0	0.0

Click for full report CSV

Board,examples/Serial<br>flash,%,examples/Serial<br>RAM for global variables,%
arduino:avr:leonardo,0,0.0,0,0.0
arduino:sam:arduino_due_x_dbg,0,0.0,N/A,N/A
arduino:samd:mkrzero,0,0.0,0,0.0

[edgar-bonet]

Merged to master. Thanks again!