diff --git a/inc/gpio.h b/inc/gpio.h
--- a/inc/gpio.h
+++ b/inc/gpio.h
@@ -4,6 +4,14 @@
 #include "stm32f0xx_hal.h"
 
 
+enum _blinkrate
+{
+    BLINK_FAST = 50,
+    BLINK_MED = 250, 
+    BLINK_SLOW = 500
+}
+
+
 #define OSC_EN_Pin GPIO_PIN_1
 #define OSC_EN_GPIO_Port GPIOF
 #define OSC_NOTEN OSC_EN_GPIO_Port , OSC_EN_Pin