Keyboard: Lily58 update serial.c and add OLED (#4715)

* update serial.c and add OLED

* update readme

* keymap fix

* keymap fix2

1 files changed, 16 insertions, 0 deletions

diff --git a/keyboards/lily58/lib/timelogger.c b/keyboards/lily58/lib/timelogger.c
new file mode 100644
index 000000000..bfbfbe8a2
--- /dev/null
+++ b/keyboards/lily58/lib/timelogger.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include "lily58.h"
+
+char timelog_str[24] = {};
+int last_time = 0;
+int elapsed_time = 0;
+
+void set_timelog(void) {
+  elapsed_time = timer_elapsed(last_time);
+  last_time = timer_read();
+  snprintf(timelog_str, sizeof(timelog_str), "lt:%5d, et:%5d", last_time, elapsed_time);
+}
+
+const char *read_timelog(void) {
+  return timelog_str;
+}