If we do not calibrate the touch screen, GUI is unusable. This patch use a semaphore to block GUI thread until calibration finish. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1791 bbd45198-f89e-11dd-88c7-29a3b14d5316
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1610 bbd45198-f89e-11dd-88c7-29a3b14d5316