Keyboard: xealous (#3731)

* Keyboard: HandWired/XeaL60

* Updated rules.mk

* Mapping for layout was flipped

* Figured out how to re-map bad pins.

* Updated Keymap

* Enabled audio, Forced NKRO

* Added QMK_KEYS_PER_SCAN

* Removed more unnecessary files, since split_keyboards are in main QMK branch already.

* Simplified rules.mk in rev1

* Removed i2c from matrix.c

* Re-formatted to 4 spaces per tab,

* Changed note for NUMPAD

* Added I2C support back!

* Fixed keyboard mappings. Both sides work

* Moved i2c configuration from keymaps/default/config.h to config.h

* Changed SCL_CLOCK to 400000L

* Added DEBUG_MATRIX_SCAN_RATE for future optimization efforts

* Removed row2col code to clean up matrix.c

* Scan rate from 2100 -> 4200 by using Nop instead of waiting 30us between columns.

* Further optimized column reading via optimized_col_reader.

* Immediate key-recognition

* Switched back to own implementation of SPLIT_KEYBOARD. Will optimize so that slave interrupts master.

* Moved scanrate debug messages to another file.

* Made matrix_scanrate.c compile if CONSOLE_ENABLE is off. Updated to latest i2c.c

* Latest i2c uses a few bytes for lighting information

* Optimizations in i2c.h to determine buffer size.

* Disabled a whole bunch of features. TODO: Test that keyboard still works fine.

* Minimum #define NO_ACTION's with still working keyboard

* Fixed matrix not working due to offsets not being respected

* Added numlock button for keymap.

* Use I2C_KEYMAP_START offset

* Removed serial, Backlight and RGB support

* Removed need for split_flags.

* Added audio on and off for numlock.

* Renamed from xeal60 to xealous, simplified build system.

* Used more shared split_common code.

* Updated audio code.

* moved tone_qwerty and tone_numpad to config.h. Removed keymaps/default/config.h

* Added more shortcut keys in _FN layer. Increased debounce to 6ms due to fencepost error.

* DF used with incorrect argument. Custom_keycodes no longer required.

* Fixed bug in update_debounce_counters which was resulting in no debouncing!

* Removed unnecessary #include

1 files changed, 39 insertions, 0 deletions

diff --git a/keyboards/handwired/xealous/matrix_scanrate.c b/keyboards/handwired/xealous/matrix_scanrate.c
new file mode 100644
index 000000000..f2c7cbe6e
--- /dev/null
+++ b/keyboards/handwired/xealous/matrix_scanrate.c
@@ -0,0 +1,39 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include "wait.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+#include "timer.h"
+
+#ifdef CONSOLE_ENABLE
+static uint16_t matrix_scan_count = 0;
+static uint32_t matrix_timer = 0;
+void matrix_check_scan_rate(void) {    
+    matrix_scan_count++;
+    if (matrix_scan_count > 1000) {
+        uint32_t timer_now = timer_read32();
+        uint16_t ms_per_thousand = TIMER_DIFF_32(timer_now, matrix_timer);
+        uint16_t rate_per_second = 1000000UL / ms_per_thousand;
+        print("scan_rate: ");
+        pdec(rate_per_second);
+        print("\n");
+        matrix_timer = timer_now;
+        matrix_scan_count = 0;
+    }    
+}
+
+static uint32_t last_scan_time = 0;
+void matrix_time_between_scans(void) {    
+    if (timer_elapsed(last_scan_time) > 1)
+    {
+        print(">1ms elapsed since last scan: ");
+        pdec(timer_elapsed(last_scan_time));
+        print("\n");
+    }
+    last_scan_time = timer_read();
+    
+}
+#endif