From 7707724dc4864cb4ede738ee9e2c3568df99ced2 Mon Sep 17 00:00:00 2001
From: Joel Challis <git@zvecr.com>
Date: Fri, 21 Feb 2020 03:49:33 +0000
Subject: [PATCH] Allow 30us matrix delay to be keyboard/user overridable 
 (#8216)

* Allow 30us matrix delay to be configurable via define

* Move wait logic to matrix_common

* Move wait logic to matrix_common - fix wait includes
---
 docs/config_options.md        | 2 ++
 quantum/matrix.c              | 5 ++---
 quantum/matrix_common.c       | 7 +++++++
 quantum/split_common/matrix.c | 5 ++---
 tmk_core/common/matrix.h      | 2 ++
 5 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/docs/config_options.md b/docs/config_options.md
index 5344fe851f..d048d17678 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -53,6 +53,8 @@ This is a C header file that is one of the first things included, and will persi
   * pins of the rows, from top to bottom
 * `#define MATRIX_COL_PINS { F1, F0, B0, C7, F4, F5, F6, F7, D4, D6, B4, D7 }`
   * pins of the columns, from left to right
+* `#define MATRIX_IO_DELAY 30`
+  * the delay in microseconds when between changing matrix pin state and reading values
 * `#define UNUSED_PINS { D1, D2, D3, B1, B2, B3 }`
   * pins unused by the keyboard for reference
 * `#define MATRIX_HAS_GHOST`
diff --git a/quantum/matrix.c b/quantum/matrix.c
index 6bd604bb79..67d8af6ee8 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -16,7 +16,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include <stdint.h>
 #include <stdbool.h>
-#include "wait.h"
 #include "util.h"
 #include "matrix.h"
 #include "debounce.h"
@@ -94,7 +93,7 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
     // Select row and wait for row selecton to stabilize
     select_row(current_row);
-    wait_us(30);
+    matrix_io_delay();
 
     // For each col...
     for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
@@ -138,7 +137,7 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 
     // Select col and wait for col selecton to stabilize
     select_col(current_col);
-    wait_us(30);
+    matrix_io_delay();
 
     // For each row...
     for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
diff --git a/quantum/matrix_common.c b/quantum/matrix_common.c
index c326e59ca3..de62b80705 100644
--- a/quantum/matrix_common.c
+++ b/quantum/matrix_common.c
@@ -1,8 +1,13 @@
 #include "matrix.h"
 #include "debounce.h"
+#include "wait.h"
 #include "print.h"
 #include "debug.h"
 
+#ifndef MATRIX_IO_DELAY
+#    define MATRIX_IO_DELAY 30
+#endif
+
 /* matrix state(1:on, 0:off) */
 matrix_row_t raw_matrix[MATRIX_ROWS];
 matrix_row_t matrix[MATRIX_ROWS];
@@ -78,6 +83,8 @@ uint8_t matrix_key_count(void) {
     return count;
 }
 
+__attribute__((weak)) void matrix_io_delay(void) { wait_us(MATRIX_IO_DELAY); }
+
 // CUSTOM MATRIX 'LITE'
 __attribute__((weak)) void matrix_init_custom(void) {}
 
diff --git a/quantum/split_common/matrix.c b/quantum/split_common/matrix.c
index 2c0e028f7d..a82334128b 100644
--- a/quantum/split_common/matrix.c
+++ b/quantum/split_common/matrix.c
@@ -16,7 +16,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include <stdint.h>
 #include <stdbool.h>
-#include "wait.h"
 #include "util.h"
 #include "matrix.h"
 #include "debounce.h"
@@ -111,7 +110,7 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
     // Select row and wait for row selecton to stabilize
     select_row(current_row);
-    wait_us(30);
+    matrix_io_delay();
 
     // For each col...
     for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
@@ -155,7 +154,7 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 
     // Select col and wait for col selecton to stabilize
     select_col(current_col);
-    wait_us(30);
+    matrix_io_delay();
 
     // For each row...
     for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
diff --git a/tmk_core/common/matrix.h b/tmk_core/common/matrix.h
index a2fedf5ff0..78506059e6 100644
--- a/tmk_core/common/matrix.h
+++ b/tmk_core/common/matrix.h
@@ -66,6 +66,8 @@ bool matrix_is_on(uint8_t row, uint8_t col);
 matrix_row_t matrix_get_row(uint8_t row);
 /* print matrix for debug */
 void matrix_print(void);
+/* delay between changing matrix pin state and reading values */
+void matrix_io_delay(void);
 
 /* power control */
 void matrix_power_up(void);