+#define MPU9250_MST_CTRL 0x24
+#define MPU9250_MST_CTRL_MULT_MST_EN 7
+#define MPU9250_MST_CTRL_WAIT_FOR_ES 6
+#define MPU9250_MST_CTRL_SLV_3_FIFO_EN 5
+#define MPU9250_MST_CTRL_I2C_MST_P_NSR 4
+#define MPU9250_MST_CTRL_I2C_MST_CLK 0
+#define MPU9250_MST_CTRL_I2C_MST_CLK_348 0
+#define MPU9250_MST_CTRL_I2C_MST_CLK_333 1
+#define MPU9250_MST_CTRL_I2C_MST_CLK_320 2
+#define MPU9250_MST_CTRL_I2C_MST_CLK_308 3
+#define MPU9250_MST_CTRL_I2C_MST_CLK_296 4
+#define MPU9250_MST_CTRL_I2C_MST_CLK_286 5
+#define MPU9250_MST_CTRL_I2C_MST_CLK_276 6
+#define MPU9250_MST_CTRL_I2C_MST_CLK_267 7
+#define MPU9250_MST_CTRL_I2C_MST_CLK_258 8
+#define MPU9250_MST_CTRL_I2C_MST_CLK_500 9
+#define MPU9250_MST_CTRL_I2C_MST_CLK_471 10
+#define MPU9250_MST_CTRL_I2C_MST_CLK_444 11
+#define MPU9250_MST_CTRL_I2C_MST_CLK_421 12
+#define MPU9250_MST_CTRL_I2C_MST_CLK_400 13
+#define MPU9250_MST_CTRL_I2C_MST_CLK_381 14
+#define MPU9250_MST_CTRL_I2C_MST_CLK_364 15
+#define MPU9250_MST_CTRL_I2C_MST_CLK_MASK 15
+
+#define MPU9250_I2C_SLV0_ADDR 0x25
+#define MPU9250_I2C_SLV0_REG 0x26
+#define MPU9250_I2C_SLV0_CTRL 0x27
+
+#define MPU9250_I2C_SLV0_CTRL_I2C_SLV0_EN 7
+#define MPU9250_I2C_SLV0_CTRL_I2C_SLV0_BYTE_SW 6
+#define MPU9250_I2C_SLV0_CTRL_I2C_SLV0_REG_DIS 5
+#define MPU9250_I2C_SLV0_CTRL_I2C_SLV0_GRP 4
+#define MPU9250_I2C_SLV0_CTRL_I2C_SLV0_LENG 0
+
+#define MPU9250_I2C_SLV1_ADDR 0x28
+#define MPU9250_I2C_SLV1_REG 0x29
+#define MPU9250_I2C_SLV1_CTRL 0x2a
+
+#define MPU9250_I2C_SLV2_ADDR 0x2b
+#define MPU9250_I2C_SLV2_REG 0x2c
+#define MPU9250_I2C_SLV2_CTRL 0x2d
+
+#define MPU9250_I2C_SLV3_ADDR 0x2e
+#define MPU9250_I2C_SLV3_REG 0x2f
+#define MPU9250_I2C_SLV3_CTRL 0x30
+
+#define MPU9250_I2C_SLV4_ADDR 0x31
+#define MPU9250_I2C_SLV4_REG 0x32
+#define MPU9250_I2C_SLV4_DO 0x33
+#define MPU9250_I2C_SLV4_CTRL 0x34
+#define MPU9250_I2C_SLV4_CTRL_I2C_SLV4_EN 7
+#define MPU9250_I2C_SLV4_CTRL_SLV4_DONE_INT_EN 6
+#define MPU9250_I2C_SLV4_CTRL_I2C_SLV4_REG_DIS 5
+#define MPU9250_I2C_SLV4_CTRL_I2C_MST_DLY 0
+
+#define MPU9250_I2C_SLV4_DI 0x35
+
+#define MPU9250_I2C_MST_STATUS 0x36
+
+#define MPU9250_INT_PIN_CFG 0x37
+