I2C_SPEED_FAST_400K
req->I2CSpeed = I2C_SPEED_FAST_400K;
req->I2CSpeed = I2C_SPEED_FAST_400K;
req->I2CSpeed = I2C_SPEED_FAST_400K;
req->I2CSpeed = I2C_SPEED_FAST_400K;
req->I2CSpeed = I2C_SPEED_FAST_400K;
req->I2CSpeed = I2C_SPEED_FAST_400K;
req->I2CSpeed = I2C_SPEED_FAST_400K;