Use _OA to prevent collisions

FFT_OA_F32.h

@@ -1,4 +1,3 @@
-
 /*
  * FFT_F32
  * 
@@ -14,8 +13,8 @@
  * License: MIT License
  */
 
-#ifndef _FFT_h
-#define _FFT_h
+#ifndef _FFT_OA_h
+#define _FFT_OA_h
 
 #include <Arduino.h>  //for Serial
 //include <math.h>

FFT_Overlapped_OA_F32.cpp

@@ -1,7 +1,7 @@
 
-#include "FFT_Overlapped_F32.h"
+#include "FFT_Overlapped_OA_F32.h"
 
-void FFT_Overlapped_F32::execute(audio_block_f32_t *block, float *complex_2N_buffer) //results returned inc omplex_2N_buffer
+void FFT_Overlapped_OA_F32::execute(audio_block_f32_t *block, float *complex_2N_buffer) //results returned inc omplex_2N_buffer
 {
   int targ_ind;
 
@@ -33,7 +33,7 @@ void FFT_Overlapped_F32::execute(audio_block_f32_t *block, float *complex_2N_buf
   myFFT.execute(complex_2N_buffer);
 }
 
-audio_block_f32_t* IFFT_Overlapped_F32::execute(float *complex_2N_buffer) { //real results returned through audio_block_f32_t
+audio_block_f32_t* IFFT_Overlapped_OA_F32::execute(float *complex_2N_buffer) { //real results returned through audio_block_f32_t
 
   //Serial.print("Overlapped_IFFT_F32: N_BUFF_BLOCKS = "); Serial.print(N_BUFF_BLOCKS);
   //Serial.print(", audio_block_samples = "); Serial.println(audio_block_samples);

FFT_Overlapped_OA_F32.h

@@ -1,5 +1,5 @@
 /*
- * FFT_Overrlapped_F32
+ * FFT_Overrlapped_OA_F32
  *
  * Purpose: Encapsulate the ARM floating point FFT/IFFT functions
  *          in a way that naturally interfaces to my float32
@@ -16,7 +16,6 @@
  *          Jan-Jul 2017
  *
  * Typical Usage as FFT:
- *          
  *            //setup the audio stuff
  *            float sample_rate_Hz = 44100.0;  //define sample rate
  *            int audio_block_samples = 32;   //define size of audio blocks
@@ -46,23 +45,37 @@
  *            audio_block_f32_t *out_audio_block = IFFT_obj.execute(complex_2N_buffer);
  *            //note that the "out_audio_block" is mananged by IFFT_obj, so don't worry about releasing it.
  *
+ *
+ *  https://forum.pjrc.com/threads/53668-fft-ifft?highlight=IFFT  willie.from.texas 9-10-2018
+ *  I've been using the CMSIS Version 5.3.0 DSP Library since May 2018 (see github.com/ARM-software/CMSIS_5).
+ *  I might be the only person on this forum using it. The library allows me to use the 32-bit floating point
+ *  capability of the Teensy 3.6. I have been able to use it in real-time with 16-bit sample rates
+ *  out of both ADCs up to around 450 kHz (i-q data). I'm very happy with the performance I am obtaining.
+ *  Here is the FFT/IFFT performance I am getting with the library:
+ *       # Points   Forward rfft    Inverse rfft   Forward cfft  Inverse cfft
+ *          512         201 us          247 us        239 us        294 us
+ *         1024         362 us          454 us        588 us        714 us
+ *         2048         846 us         1066 us       1376 us       1620 us
+ *         4096        1860 us         2304 us       2504 us       2990 us
+ *
+ *
  * License: MIT License
  */
-#ifndef _FFT_Overlapped_F32_h
-#define _FFT_Overlapped_F32_h
+#ifndef _FFT_Overlapped_OA_F32_h
+#define _FFT_Overlapped_OA_F32_h
 
 #include "AudioStream_F32.h"
 #include <arm_math.h>
-#include "FFT_F32.h"
+#include "FFT_OA_F32.h"
 //#include "utility/dspinst.h"  //copied from analyze_fft256.cpp.  Do we need this?
 
 // set the max amount of allowed overlap...some number larger than you'll want to use
 #define MAX_N_BUFF_BLOCKS 32  //32 blocks x 16 sample blocks enables NFFT = 512, if the Teensy could keep up.
 
-class FFT_Overlapped_Base_F32 {  //handles all the data structures for the overlapping stuff.  Doesn't care if FFT or IFFT
+class FFT_Overlapped_Base_OA_F32 {  //handles all the data structures for the overlapping stuff.  Doesn't care if FFT or IFFT
   public:
-    FFT_Overlapped_Base_F32(void) {};
-    ~FFT_Overlapped_Base_F32(void) {
+    FFT_Overlapped_Base_OA_F32(void) {};
+    ~FFT_Overlapped_Base_OA_F32(void) {
       if (N_BUFF_BLOCKS > 0) {
         for (int i = 0; i < N_BUFF_BLOCKS; i++) {
           if (buff_blocks[i] != NULL) AudioStream_F32::release(buff_blocks[i]);
@@ -117,13 +130,13 @@ class FFT_Overlapped_Base_F32 {  //handles all the data structures for the overl
     }
 };
 
-class FFT_Overlapped_F32: public FFT_Overlapped_Base_F32
+class FFT_Overlapped_OA_F32: public FFT_Overlapped_Base_F32
 {
   public:
     //constructors
-    FFT_Overlapped_F32(void): FFT_Overlapped_Base_F32() {};
-    FFT_Overlapped_F32(const AudioSettings_F32 &settings): FFT_Overlapped_Base_F32()  { }
-    FFT_Overlapped_F32(const AudioSettings_F32 &settings, const int _N_FFT): FFT_Overlapped_Base_F32()  { 
+    FFT_Overlapped_OA_F32(void): FFT_Overlapped_Base_F32() {};
+    FFT_Overlapped_OA_F32(const AudioSettings_F32 &settings): FFT_Overlapped_Base_F32()  { }
+    FFT_Overlapped_OA_F32(const AudioSettings_F32 &settings, const int _N_FFT): FFT_Overlapped_Base_F32()  {
       setup(settings,_N_FFT);
     }
 
@@ -144,14 +157,13 @@ class FFT_Overlapped_F32: public FFT_Overlapped_Base_F32
     FFT_F32 myFFT;
 };
 
-
-class IFFT_Overlapped_F32: public FFT_Overlapped_Base_F32
+class IFFT_Overlapped_OA_F32: public FFT_Overlapped_Base_F32
 {
   public:
     //constructors
-    IFFT_Overlapped_F32(void): FFT_Overlapped_Base_F32() {};
-    IFFT_Overlapped_F32(const AudioSettings_F32 &settings): FFT_Overlapped_Base_F32()  { }
-    IFFT_Overlapped_F32(const AudioSettings_F32 &settings, const int _N_FFT): FFT_Overlapped_Base_F32()  { 
+    IFFT_Overlapped_OA_F32(void): FFT_Overlapped_Base_F32() {};
+    IFFT_Overlapped_OA_F32(const AudioSettings_F32 &settings): FFT_Overlapped_Base_F32()  { }
+    IFFT_Overlapped_OA_F32(const AudioSettings_F32 &settings, const int _N_FFT): FFT_Overlapped_Base_F32()  {
       setup(settings,_N_FFT);
     }
 
@@ -170,8 +182,4 @@ class IFFT_Overlapped_F32: public FFT_Overlapped_Base_F32
   private:
     IFFT_F32 myIFFT;
 };
-
-
-
-
 #endif

OpenAudio_ArduinoLibrary.h

@@ -29,5 +29,5 @@
 #include "analyze_peak_f32.h"
 #include "analyze_rms_f32.h"
 // #include "control_tlv320aic3206.h"  collides much with Teensy Audio
-#include "AudioSwitch_F32.h"
-#include "FFT_Overlapped_F32.h"
+#include "AudioSwitch_OA_F32.h"
+#include "FFT_Overlapped_OA_F32.h"