Diff: audio_record.c

Revision:

1:1ae4b642c533

Parent:

0:d4e5ad7ad71c

Child:

3:ec7e3c37fe80

--- a/audio_record.c	Mon Nov 23 19:37:13 2015 +0000
+++ b/audio_record.c	Wed Nov 25 17:31:28 2015 +0000
@@ -1,5 +1,3 @@
-
-
 /* Includes ------------------------------------------------------------------*/
 #include "main.h"
 
@@ -17,25 +15,19 @@
 
 /* Private define ------------------------------------------------------------*/
 /* Size (in bytes) of the buffer containing the recorded PCM samples */
-#define RECORD_BUFFER_SIZE (uint32_t)1024
+#define RECORD_BUFFER_SIZE (uint32_t)1024 //BUFFER SIZE IS THE SAME FOR BOTH RECORDINGS 
 
-/* Private macro -------------------------------------------------------------*/
-/* Private variables ---------------------------------------------------------*/
 /* Buffer containing the PCM samples coming from the microphone */
-static uint16_t RecordBuffer[RECORD_BUFFER_SIZE];
+static uint32_t RecordBuffer[RECORD_BUFFER_SIZE]; //RECORDING BUFFER FOR SAMPLE #0
+static uint32_t RecordBuffer1[RECORD_BUFFER_SIZE];//RECORDING BUFFER FOR SAMPLE #1
 
 /* Buffer used to stream the recorded PCM samples towards the audio codec. */
-static uint16_t PlaybackBuffer[RECORD_BUFFER_SIZE*2];
+static uint16_t PlaybackBuffer[RECORD_BUFFER_SIZE*2]; //PLAYBACK BUFFER FOR SAMPLE#0
+static uint16_t PlaybackBuffer1[RECORD_BUFFER_SIZE*2];//PLAYBACK BUFFER FOR SAMPLE#1
 
 
 #define NB_SAMPLES_RATE 7
-static uint32_t SamplesRates[NB_SAMPLES_RATE] = {BSP_AUDIO_FREQUENCY_48K,
-                                                 BSP_AUDIO_FREQUENCY_44K,
-                                                 BSP_AUDIO_FREQUENCY_32K,
-                                                 BSP_AUDIO_FREQUENCY_22K,
-                                                 BSP_AUDIO_FREQUENCY_16K,
-                                                 BSP_AUDIO_FREQUENCY_11K,
-                                                 BSP_AUDIO_FREQUENCY_8K};
+static uint32_t SamplesRates[NB_SAMPLES_RATE] = {BSP_AUDIO_FREQUENCY_48K}; //SAMPLE RATE IS THE SAME
 
 /* Information indicating which part of the recorded buffer is ready for audio loopback  */
 static RecordBufferOffset_Typedef  RecordBufferOffset = BUFFER_OFFSET_NONE;
@@ -64,9 +56,9 @@
   /* Indicates which part of the payback buffer must be updated */
   uint8_t transfer_range = 0;
   
-  /* Flag indicating whether the audio codec has already been initialized */
+      /* Flag indicating whether the audio codec has already been initialized */
   uint32_t audio_loop_back_init = RESET ; 
-  
+    
   /* Audio record demo is running */
   AudioDemo = AUDIO_DEMO_RECORD;
   
@@ -78,7 +70,7 @@
 
   /* Select the audio record sample rate */
   SampleRateSelection();
-  
+  //INITIALIZE RECORDING #0
   /* Initialize audio input */
   if (BSP_AUDIO_IN_Init(SamplesRates[SampleRateIndex],
                         DEFAULT_AUDIO_IN_BIT_RESOLUTION,
@@ -99,10 +91,19 @@
   {
     Error_Handler();
   }
-  
+  uint32_t counter=0; //COUNTER IS REGISTER R4
   /* PCM samples recording loop */
   while (AudioRecordExit != SET)
   {
+        
+        if (counter==10000000) //Approximately 3 seconds of record time
+        {
+            AudioRecordExit=1;
+        }
+        else
+        {
+            counter=counter++;
+        }
     /* 1st or 2nd half of the record buffer ready for being copied 
        to the playback buffer */
     if(RecordBufferOffset != BUFFER_OFFSET_NONE)
@@ -130,28 +131,118 @@
   }
   
   
+  /* Stop audio input */
+  if (BSP_AUDIO_IN_Stop() != AUDIO_OK)
+  {
+    Error_Handler();
+  }
+      /* De-initialize audio input */
+  if (BSP_AUDIO_IN_DeInit() != AUDIO_OK)
+  {
+    Error_Handler();
+  } 
+    //END OF RECORDING #0
+    //INITIALIZE RECORDING #1
+    transfer_range = 0;
+    
+      /* Flag indicating whether the audio codec has already been initialized */
+  audio_loop_back_init = RESET ; 
+    
+  /* Turn off green LED5 */
+  BSP_LED_Off(LED5);
   
-
+  /* Initialize record buffer offset */
+  RecordBufferOffset = BUFFER_OFFSET_NONE;
+     /* Initialize audio input */
+  if (BSP_AUDIO_IN_Init(SamplesRates[SampleRateIndex],
+                        DEFAULT_AUDIO_IN_BIT_RESOLUTION,
+                        DEFAULT_AUDIO_IN_CHANNEL_NBR) != AUDIO_OK)
+  {
+    /* Record Error */
+    Error_Handler();
+  } 
+  
+  /* Set Callback function pointers */
+  BSP_AUDIO_IN_RegisterCallbacks(AudioRecord_Error_CallBack,
+                                 AudioRecord_HalfTransfer_CallBack,
+                                 AudioRecord_TransferComplete_CallBack);
+  
+      /* Start the audio record */
+  if (BSP_AUDIO_IN_Record((uint16_t*)&RecordBuffer1[0],
+                          RECORD_BUFFER_SIZE) != AUDIO_OK)
+  {
+    Error_Handler();
+  }
+  
+    AudioRecordExit = 0; //RESET AUDIO RECORD FLAG
+    counter=0;                   //RESET COUNTER
+  /* PCM samples recording loop */ //COPIED FROM ABOVE USE '1' WHEN REFERENCING VARIABLES
+  while (AudioRecordExit != SET)
+  {
+        
+        if (counter==10000000) //Approximately 3 seconds of record time
+        {
+            AudioRecordExit=1;   //FLAG IS REGISTER R5
+        }
+        else
+        {
+            counter=counter++;
+        }
+    /* 1st or 2nd half of the record buffer ready for being copied 
+       to the playback buffer */
+    if(RecordBufferOffset != BUFFER_OFFSET_NONE)
+    {
+      /* Copy half of the record buffer to the playback buffer */
+      if(RecordBufferOffset == BUFFER_OFFSET_HALF)
+      {
+        memcpy(&PlaybackBuffer1[(RECORD_BUFFER_SIZE/2) * transfer_range],
+               RecordBuffer1,
+               RECORD_BUFFER_SIZE);
+        
+        
+      }
+      else /* if(RecordBufferOffset == BUFFER_OFFSET_FULL)*/
+      {
+        memcpy(&PlaybackBuffer1[(RECORD_BUFFER_SIZE/2) * transfer_range],
+               &RecordBuffer1[RECORD_BUFFER_SIZE/2],
+               RECORD_BUFFER_SIZE);
+      }
+      
+      /* Wait for next data */
+      RecordBufferOffset = BUFFER_OFFSET_NONE;  
+      transfer_range = (transfer_range+1) % 4;
+    }
+  }
+  
   
   /* Stop audio input */
   if (BSP_AUDIO_IN_Stop() != AUDIO_OK)
   {
     Error_Handler();
   }
-  
+    
   /* De-initialize audio input */
   if (BSP_AUDIO_IN_DeInit() != AUDIO_OK)
   {
     Error_Handler();
   } 
-  
+  //END OF RECORDING #1
   /* Turn OFF LED5: stop record */
   BSP_LED_Off(LED5);
   
-  
   /* Reset AudioRecordExit flag */
   AudioRecordExit = 0;
-  
+ 
+//COMPARISON ALGORITHM START
+
+/*arm_cfft_f32    (   const arm_cfft_instance_f32 *   S,
+    float32_t *     p1,
+    uint8_t     ifftFlag,
+    uint8_t     bitReverseFlag 
+)   
+    
+    */
+    
     /* Turn off green led */
   AudioDemo = AUDIO_DEMO_NONE;
 }
@@ -172,29 +263,8 @@
    case BSP_AUDIO_FREQUENCY_48K:
      BSP_LCD_GLASS_DisplayString((uint8_t *)"48000");
      break;
-   case BSP_AUDIO_FREQUENCY_44K:
-     BSP_LCD_GLASS_DisplayString((uint8_t *)"44000");
-     break;
-   case BSP_AUDIO_FREQUENCY_32K:
-     BSP_LCD_GLASS_DisplayString((uint8_t *)"32000");
-     break;
-   case BSP_AUDIO_FREQUENCY_22K:
-     BSP_LCD_GLASS_DisplayString((uint8_t *)"22000");
-     break;
-   case BSP_AUDIO_FREQUENCY_16K:
-     BSP_LCD_GLASS_DisplayString((uint8_t *)"16000");
-     break;
-   case BSP_AUDIO_FREQUENCY_11K:
-     BSP_LCD_GLASS_DisplayString((uint8_t *)"11000");
-     break;
-   case BSP_AUDIO_FREQUENCY_8K:
-     BSP_LCD_GLASS_DisplayString((uint8_t *)"8000");
-     break;
-   default:
-     break;
-   }
-}
-
+     }
+ }
 /**
   * @brief  Audio record sample rate selection 
   * @param  None