add get_matrix_scan_rate() to tmk_core/common/keyboard.c (#11489)

common_features.mk

@@ -24,6 +24,8 @@ QUANTUM_SRC += \
 ifeq ($(strip $(DEBUG_MATRIX_SCAN_RATE_ENABLE)), yes)
     OPT_DEFS += -DDEBUG_MATRIX_SCAN_RATE
     CONSOLE_ENABLE = yes
+else ifeq ($(strip $(DEBUG_MATRIX_SCAN_RATE_ENABLE)), api)
+    OPT_DEFS += -DDEBUG_MATRIX_SCAN_RATE
 endif
 
 ifeq ($(strip $(API_SYSEX_ENABLE)), yes)

tmk_core/common/keyboard.c

@@ -97,21 +97,28 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #endif
 
 // Only enable this if console is enabled to print to
-#if defined(DEBUG_MATRIX_SCAN_RATE) && defined(CONSOLE_ENABLE)
+#if defined(DEBUG_MATRIX_SCAN_RATE)
 static uint32_t matrix_timer      = 0;
 static uint32_t matrix_scan_count = 0;
+static uint32_t last_matrix_scan_count = 0;
 
 void matrix_scan_perf_task(void) {
     matrix_scan_count++;
 
     uint32_t timer_now = timer_read32();
     if (TIMER_DIFF_32(timer_now, matrix_timer) > 1000) {
+#    if defined(CONSOLE_ENABLE)
         dprintf("matrix scan frequency: %d\n", matrix_scan_count);
-
+#    endif
+        last_matrix_scan_count = matrix_scan_count;
         matrix_timer      = timer_now;
         matrix_scan_count = 0;
     }
 }
+
+uint32_t get_matrix_scan_rate(void) {
+    return last_matrix_scan_count;
+}
 #else
 #    define matrix_scan_perf_task()
 #endif

tmk_core/common/keyboard.h

@@ -73,6 +73,8 @@ void keyboard_post_init_user(void);
 void housekeeping_task_kb(void);
 void housekeeping_task_user(void);
 
+uint32_t get_matrix_scan_rate(void);
+
 #ifdef __cplusplus
 }
 #endif