diff --git a/mission/devices/devicedefinitions/GyroL3GD20Definitions.h b/mission/devices/devicedefinitions/GyroL3GD20Definitions.h
index 598803fa..d331a8d9 100644
--- a/mission/devices/devicedefinitions/GyroL3GD20Definitions.h
+++ b/mission/devices/devicedefinitions/GyroL3GD20Definitions.h
@@ -1,8 +1,23 @@
 #ifndef MISSION_DEVICES_DEVICEDEFINITIONS_GYROL3GD20DEFINITIONS_H_
 #define MISSION_DEVICES_DEVICEDEFINITIONS_GYROL3GD20DEFINITIONS_H_
 
+#include <cstdint>
+
 namespace L3GD20H {
 
+static constexpr uint8_t READ_MASK = 0b1000'0000;
+
+static constexpr uint8_t AUTO_INCREMENT_MASK = 0b0100'0000;
+
+static constexpr uint8_t WHO_AM_I_REG = 0b0000'1111;
+static constexpr uint8_t WHO_AM_I_VAL = 0b1101'0111;
+
+static constexpr uint8_t CTRL_REG_1 = 0b0010'0000;
+static constexpr uint8_t CTRL_REG_2 = 0b0010'0001;
+static constexpr uint8_t CTRL_REG_3 = 0b0010'0010;
+static constexpr uint8_t CTRL_REG_4 = 0b0010'0011;
+static constexpr uint8_t CTRL_REG_5 = 0b0010'0100;
+
 
 }