使用STM32_的DSP库进行FFT变换说明及例程.doc

/*?*********************************************************************************************************?FileName:dsp_asm.h?*********************************************************************************************************?*/?#ifndef??__DSP_ASM_H__?#define??__DSP_ASM_H__?*********************************************************************************************************?*????????????????????????????????????????????FUNCTION?PROTOTYPES?*********************************************************************************************************?*/?void????dsp_asm_test(void);?void??dsp_asm_init(void);?#endif??????????????????????????????????????????????????????????/*?End?of?module?include.???????????????????????????????*/?/*8888888888888888888888888888888888888888888888888888888888888888*/?/*8888888888888888888888888888888888888888888888888888888888888888*/?/*?*?FileName:dsp_asm.c?*?Author:Bobby.Chen?*?Email:heroxx@163.com?*?Date:2010-08-11?*?Description:This?file?showes?how?to?use?the?dsp?library?in?mdk?project.?*??????????????????使用三角函数生成采样点，供FFT计算?*??????????????????进行FFT测试时，按下面顺序调用函数即可：?*???????????????????dsp_asm_init();?*???????????????????dsp_asm_test();?*/?#include?stm32f10x.h?#include?dsp_asm.h?#include?stm32_dsp.h?#include?table_fft.h?#include?stdio.h?#include?math.h?/*?*********************************************************************************************************?*???????????????????????????????????????????LOCAL?CONSTANTS?*********************************************************************************************************?*/?#define?PI2?6.28318530717959?//?Comment?the?lines?that?you?dont?want?to?use.?//?要模拟FFT，请注释掉其他的预定义?//?此处也可以全部注释掉，在MDK的工程属性-C/C++-Preprocessor?Symbols-Define:中添加NPT_XXX项目?//?但是这样做法的缺点是每次修改XXX数据，都会导致MDK下次编译时会编译全部文件，速度太慢。?//#define?NPT_64?64?#define?NPT_256?256?//#define?NPT_1024?1024?//?N=64,Fs/N=50Hz,Max(Valid)=1600Hz?//?64点FFt，采样率3200Hz,频率分辨率50Hz，测量最大有效频率1600Hz?