Touch Screen
http://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md#troubleshooting
http://blog.naver.com/PostView.nhn?blogId=jjong_w&logNo=220971986593&categoryNo=4&parentCategoryNo=0&viewDate=¤tPage=1&postListTopCurrentPage=1&from=search