bluetooth_battery_level.patch

diff --git a/keyboard/hhkb/rn42/rn42.c b/keyboard/hhkb/rn42/rn42.c
index 710169e..0af0daf 100644
--- a/keyboard/hhkb/rn42/rn42.c
+++ b/keyboard/hhkb/rn42/rn42.c
@@ -235,3 +235,16 @@ static void config_send_keyboard(report_keyboard_t *report) {}
 static void config_send_mouse(report_mouse_t *report) {}
 static void config_send_system(uint16_t data) {}
 static void config_send_consumer(uint16_t data) {}
+
+void rn42_printf(const char * format, ...) {
+    int i;
+    char buf[256];
+    va_list args;
+    va_start(args, format);
+    vsprintf(buf, format, args);
+    va_end(args);
+    for (i=0; i<strlen(buf); i++) {
+        serial_send(buf[i]);
+    }
+}
+
diff --git a/keyboard/hhkb/rn42/rn42.h b/keyboard/hhkb/rn42/rn42.h
index db6916f..9ec0d0c 100644
--- a/keyboard/hhkb/rn42/rn42.h
+++ b/keyboard/hhkb/rn42/rn42.h
@@ -19,5 +19,6 @@ void rn42_cts_hi(void);
 void rn42_cts_lo(void);
 bool rn42_linked(void);
 void rn42_set_leds(uint8_t l);
+void rn42_printf(const char * format, ...);

 #endif
diff --git a/keyboard/hhkb/rn42/rn42_task.c b/keyboard/hhkb/rn42/rn42_task.c
index 5107fef..e465eaa 100644
--- a/keyboard/hhkb/rn42/rn42_task.c
+++ b/keyboard/hhkb/rn42/rn42_task.c
@@ -364,6 +364,7 @@ bool command_extra(uint8_t code)
             xprintf("%02u:",   t/3600);
             xprintf("%02u:",   t%3600/60);
             xprintf("%02u\n",  t%60);
+            rn42_printf("BAT: %umV\t", b);
             return true;
         case KC_U:
             if (config_mode) return false;