说明：  利用汇编语言和TMS320F2812芯片实现FFT的算法，该算法对128点和256点很有效，使用过程中要考虑信号值不能太小
(use of assembly language and TMS320F2812 chip FFT algorithm for 128 points and 256 points very effective, the process used to be considered too small signal value can not)