Unify matrix for split common and regular matrix

[drashna]

Description

This merges the split matrix.c with the regular matrix.c, since the files are nearly identical anyways. This will make management of the matrix code simpler, in theory, as there will only be one source of truth for matrix scanning (aside from custom matrices).

Tested on a corne, and verified that it does work properly.

Types of Changes

• Core
• Enhancement/optimization

Issues Fixed or Closed by This PR

• Probably an item on tzarc's to-do list

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[mtei]

To my liking, it would be better to move the definition of matrix_post_scan () to the new file quantum/split_common/matrix_split.c. Because I think it's more natural for code that is closely related to transport.c to be in the same hierarchy.

[drashna]

matrix_post_scan

Would it make sense to throw the function into split_util.c instead?
Especially since there are some other functions there already that are being called?

I'm all for doing this, but a quick look, there are a few other things that could also be moved out. I think I'd rather get this in, and then work on separating out more of the split specific stuff (such as the init code, etc)

[mtei]

I find the following code to be a bit easier to read.

#ifdef DIRECT_PINS_RIGHT
#    define SPLIT_MUTABLE
#else
#    define SPLIT_MUTABLE const
#endif
#ifdef MATRIX_ROW_PINS_RIGHT
#    define SPLIT_MUTABLE_ROW
#else
#    define SPLIT_MUTABLE_ROW const
#endif
#ifdef MATRIX_COL_PINS_RIGHT
#    define SPLIT_MUTABLE_COL
#else
#    define SPLIT_MUTABLE_COL const
#endif

#ifdef DIRECT_PINS
static SPLIT_MUTABLE pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
#    ifdef MATRIX_ROW_PINS
static SPLIT_MUTABLE_ROW pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
#    endif // MATRIX_ROW_PINS
#    ifdef MATRIX_COL_PINS
static SPLIT_MUTABLE_COL pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
#    endif // MATRIX_COL_PINS
#endif

[drashna]

It's definitely a lot more concise, and I believe that tzarc mentioned doing something similar.

Applied.

[drashna]

@mtei
Looks like this breaks a couple of the helix boards, due to name overlapping.
Added a commit to rename the files to prevent this issue.

[mtei]

quantum/matrix.c must include quantum/split_common/split_util.h and the other split_util.h must be ignored.
The best way to do this is to explicitly specify split_common/ as follows:

diff --git a/quantum/matrix.c b/quantum/matrix.c
index 7b6954e54..ed4643f81 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -22,8 +22,8 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include "debounce.h"
 #include "quantum.h"
 #ifdef SPLIT_KEYBOARD
-#    include "split_util.h"
-#    include "transactions.h"
+#    include "split_common/split_util.h"
+#    include "split_common/transactions.h"
 
 #    ifndef ERROR_DISCONNECT_COUNT
 #        define ERROR_DISCONNECT_COUNT 5

So you don't need to modify the files under keyboards/helix/.

See the URL below for the behavior of the C preprocessor include.

• https://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html
• https://docs.oracle.com/cd/E37069_01/html/E37074/bjadq.html#scrolltoc

[drashna]

thanks for the info and correction, @mtei!

I've reverted the commit and replaced it with this.

[drashna]

And now I'll see about pulling out more of the split code from the matrix, as well.