max7456是美信的一颗OSD芯片，比NEC的6450，6453，功能强大，程序电路却简单了很多，本程序有对MAX7456的操作，用的是STM32的ARM7，硬件的SPI-max7456 is beautiful letters an OSD chip, compared with NEC' s 6450,6453, and powerful, the program has a simple circuit a lot, this program has on the MAX7456