合众达的DM642示例工程，包括视频loop，spi接口，SD卡，i2c接口，FLASH自动boot-Tatsu' s DM642 united sample works, including the video loop, spi interface, SD card, i2c interface, FLASH automatically boot

sd卡的完整的代码，比较有参考价值哦。可以方便做Sd卡驱动的人作开发用。-sd card full of code, oh, more useful. Sd card can be easily done for the development of people-driven use.