How to set landscape mode in xcode

cocos2d-x C++
#1

How to set landscape mode in xcode only with 180 degrees…
I know kCCDeviceOrientationPortrait gives us auto landscap but I dont want that with 90 degrees; only with 180 degrees…
Thanx

#2

In my opinion, the default orientation of device is portrait(0 degrees), the landscope is (90 degrees or 270 degress).
rotate 180 degree, you want rotate to CCDeviceOrientationPortraitUpsideDown?