Diff: signal_processing.cpp

Revision:

0:c0f52e8223fe

Child:

1:103e3e426b55

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/signal_processing.cpp	Fri Jan 31 21:41:25 2020 +0000
@@ -0,0 +1,104 @@
+/**
+  ******************************************************************************
+  * @file    signal_processing.c
+  * @author  Brian Mazzeo
+  * @date    2020
+  * @brief   This file provides a set of code for signal processing in 487.
+  *          Parts are taken from example code from STMIcroelectronics
+  ******************************************************************************
+  * @attention
+  *          This code was specifically developed for BYU ECEn 487 course 
+  *          Introduction to Digital Signal Processing.
+  *
+  *
+  ******************************************************************************
+  */ 
+
+#include "mbed.h"
+#include "stm32746g_discovery_lcd.h"
+#include "arm_math.h"
+#include "arm_const_structs.h"
+#include "filter_coefficients.h"
+
+
+/* ---------------------------------------------------------------------- 
+** Defines for signal processing
+** ------------------------------------------------------------------- */ 
+
+#define AUDIO_BLOCK_SAMPLES             ((uint32_t)128)         // Number of samples (L and R) in audio block (each samples is 16 bits)
+
+/* For Lab Exercise */
+#define Lab_Execution_Type              0
+
+
+
+/* FUNCTION DEFINITIONS BELOW */
+
+/**
+  * @brief  Initialize filter structures to be used in loops later
+  * @retval None
+  */
+void initalize_signal_processing(void) {
+
+  switch (Lab_Execution_Type)
+  {
+  case 0: // Passthrough case
+    break;
+  
+  case 1: // FIR case (ARM)
+    break;
+  
+  case 2: // FIR case (student)
+    break;
+  
+  case 3: // FFT Overlap-add 
+    break;
+    
+  case 4: // FFT Overlap-add with real-imag efficiency
+    break;
+
+
+  }
+}
+
+/**
+  * @brief  Process audio channel signals
+  * @param  L_channel_in: Pointer to Left channel data input (float32_t)
+  * @param  R_channel_in: Pointer to Right channel data input (float32_t)
+  * @param  L_channel_out: Pointer to Left channel data output (float32_t)
+  * @param  R_channel_out: Pointer to Right channel data output (float32_t)
+  * @param  Signal_Length: length of data to process
+  * @retval None
+  */
+void process_audio_channel_signals(float32_t* L_channel_in, float32_t* R_channel_in, float32_t* L_channel_out, float32_t* R_channel_out, uint16_t Signal_Length)
+{
+    char buf[70];    
+    BSP_LCD_SetFont(&Font8);
+    BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
+    sprintf(buf, "Processing Signals" );
+    BSP_LCD_DisplayStringAt(0, 200, (uint8_t *) buf, LEFT_MODE);
+
+  switch(Lab_Execution_Type)
+  {
+  case 0: // Passthrough case
+    arm_copy_f32(L_channel_in, L_channel_out, AUDIO_BLOCK_SAMPLES);
+    arm_copy_f32(R_channel_in, R_channel_out, AUDIO_BLOCK_SAMPLES);
+    break;
+  
+  case 1: // FIR case (ARM)
+    break;
+  
+  case 2: // FIR case (student)
+    break;
+  
+  case 3: // FFT Overlap-add 
+    break;
+    
+  case 4: // FFT Overlap-add with real-imag efficiency
+    break;
+
+    
+  }
+    /* Change font back */  
+    BSP_LCD_SetFont(&Font16);
+}