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你包含printf所在的头文件了吗？
一般printf和具体的硬件有关，需要自己重新写一个
参考：http://wenku.baidu.com/link?url=lTEgMqzs8F0IKHDWF_gHOwxJn7ILWPHcKUy5Ml19QfnePTmOG04KjpOzZL0QBMqjh-j5rHMMjVq5m7pwyw4GqUy6OZFNQXDrILENllzsweq
恩恩，非常感谢！
