基于stm32 f407 discovery 的ov7670色彩追踪（黑白模式-白色背景追踪黑色） 调试源码 mdk4.72a版本坏境-Based on stm32 f407 discovery of trace ov7670 color (black and white mode- tracking white background black) debug source code version of a bad environment mdk4.72a