R&J / Mbed 2 deprecated 487_Laboratory_2

initial

Dependencies:   mbed BSP_DISCO_F746NG mbed-dsp

signal_processing.cpp@0:c0f52e8223fe, 2020-01-31 (annotated)

Committer:
bmazzeo
Date:
Fri Jan 31 21:41:25 2020 +0000
Revision:
0:c0f52e8223fe
Child:
1:103e3e426b55
Code prepared for distribution to ECEn 487 Class.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bmazzeo 0:c0f52e8223fe 1 /**
bmazzeo 0:c0f52e8223fe 2 ******************************************************************************
bmazzeo 0:c0f52e8223fe 3 * @file signal_processing.c
bmazzeo 0:c0f52e8223fe 4 * @author Brian Mazzeo
bmazzeo 0:c0f52e8223fe 5 * @date 2020
bmazzeo 0:c0f52e8223fe 6 * @brief This file provides a set of code for signal processing in 487.
bmazzeo 0:c0f52e8223fe 7 * Parts are taken from example code from STMIcroelectronics
bmazzeo 0:c0f52e8223fe 8 ******************************************************************************
bmazzeo 0:c0f52e8223fe 9 * @attention
bmazzeo 0:c0f52e8223fe 10 * This code was specifically developed for BYU ECEn 487 course
bmazzeo 0:c0f52e8223fe 11 * Introduction to Digital Signal Processing.
bmazzeo 0:c0f52e8223fe 12 *
bmazzeo 0:c0f52e8223fe 13 *
bmazzeo 0:c0f52e8223fe 14 ******************************************************************************
bmazzeo 0:c0f52e8223fe 15 */
bmazzeo 0:c0f52e8223fe 16
bmazzeo 0:c0f52e8223fe 17 #include "mbed.h"
bmazzeo 0:c0f52e8223fe 18 #include "stm32746g_discovery_lcd.h"
bmazzeo 0:c0f52e8223fe 19 #include "arm_math.h"
bmazzeo 0:c0f52e8223fe 20 #include "arm_const_structs.h"
bmazzeo 0:c0f52e8223fe 21 #include "filter_coefficients.h"
bmazzeo 0:c0f52e8223fe 22
bmazzeo 0:c0f52e8223fe 23
bmazzeo 0:c0f52e8223fe 24 /* ----------------------------------------------------------------------
bmazzeo 0:c0f52e8223fe 25 ** Defines for signal processing
bmazzeo 0:c0f52e8223fe 26 ** ------------------------------------------------------------------- */
bmazzeo 0:c0f52e8223fe 27
bmazzeo 0:c0f52e8223fe 28 #define AUDIO_BLOCK_SAMPLES ((uint32_t)128) // Number of samples (L and R) in audio block (each samples is 16 bits)
bmazzeo 0:c0f52e8223fe 29
bmazzeo 0:c0f52e8223fe 30 /* For Lab Exercise */
bmazzeo 0:c0f52e8223fe 31 #define Lab_Execution_Type 0
bmazzeo 0:c0f52e8223fe 32
bmazzeo 0:c0f52e8223fe 33
bmazzeo 0:c0f52e8223fe 34
bmazzeo 0:c0f52e8223fe 35 /* FUNCTION DEFINITIONS BELOW */
bmazzeo 0:c0f52e8223fe 36
bmazzeo 0:c0f52e8223fe 37 /**
bmazzeo 0:c0f52e8223fe 38 * @brief Initialize filter structures to be used in loops later
bmazzeo 0:c0f52e8223fe 39 * @retval None
bmazzeo 0:c0f52e8223fe 40 */
bmazzeo 0:c0f52e8223fe 41 void initalize_signal_processing(void) {
bmazzeo 0:c0f52e8223fe 42
bmazzeo 0:c0f52e8223fe 43 switch (Lab_Execution_Type)
bmazzeo 0:c0f52e8223fe 44 {
bmazzeo 0:c0f52e8223fe 45 case 0: // Passthrough case
bmazzeo 0:c0f52e8223fe 46 break;
bmazzeo 0:c0f52e8223fe 47
bmazzeo 0:c0f52e8223fe 48 case 1: // FIR case (ARM)
bmazzeo 0:c0f52e8223fe 49 break;
bmazzeo 0:c0f52e8223fe 50
bmazzeo 0:c0f52e8223fe 51 case 2: // FIR case (student)
bmazzeo 0:c0f52e8223fe 52 break;
bmazzeo 0:c0f52e8223fe 53
bmazzeo 0:c0f52e8223fe 54 case 3: // FFT Overlap-add
bmazzeo 0:c0f52e8223fe 55 break;
bmazzeo 0:c0f52e8223fe 56
bmazzeo 0:c0f52e8223fe 57 case 4: // FFT Overlap-add with real-imag efficiency
bmazzeo 0:c0f52e8223fe 58 break;
bmazzeo 0:c0f52e8223fe 59
bmazzeo 0:c0f52e8223fe 60
bmazzeo 0:c0f52e8223fe 61 }
bmazzeo 0:c0f52e8223fe 62 }
bmazzeo 0:c0f52e8223fe 63
bmazzeo 0:c0f52e8223fe 64 /**
bmazzeo 0:c0f52e8223fe 65 * @brief Process audio channel signals
bmazzeo 0:c0f52e8223fe 66 * @param L_channel_in: Pointer to Left channel data input (float32_t)
bmazzeo 0:c0f52e8223fe 67 * @param R_channel_in: Pointer to Right channel data input (float32_t)
bmazzeo 0:c0f52e8223fe 68 * @param L_channel_out: Pointer to Left channel data output (float32_t)
bmazzeo 0:c0f52e8223fe 69 * @param R_channel_out: Pointer to Right channel data output (float32_t)
bmazzeo 0:c0f52e8223fe 70 * @param Signal_Length: length of data to process
bmazzeo 0:c0f52e8223fe 71 * @retval None
bmazzeo 0:c0f52e8223fe 72 */
bmazzeo 0:c0f52e8223fe 73 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)
bmazzeo 0:c0f52e8223fe 74 {
bmazzeo 0:c0f52e8223fe 75 char buf[70];
bmazzeo 0:c0f52e8223fe 76 BSP_LCD_SetFont(&Font8);
bmazzeo 0:c0f52e8223fe 77 BSP_LCD_SetTextColor(LCD_COLOR_CYAN);
bmazzeo 0:c0f52e8223fe 78 sprintf(buf, "Processing Signals" );
bmazzeo 0:c0f52e8223fe 79 BSP_LCD_DisplayStringAt(0, 200, (uint8_t *) buf, LEFT_MODE);
bmazzeo 0:c0f52e8223fe 80
bmazzeo 0:c0f52e8223fe 81 switch(Lab_Execution_Type)
bmazzeo 0:c0f52e8223fe 82 {
bmazzeo 0:c0f52e8223fe 83 case 0: // Passthrough case
bmazzeo 0:c0f52e8223fe 84 arm_copy_f32(L_channel_in, L_channel_out, AUDIO_BLOCK_SAMPLES);
bmazzeo 0:c0f52e8223fe 85 arm_copy_f32(R_channel_in, R_channel_out, AUDIO_BLOCK_SAMPLES);
bmazzeo 0:c0f52e8223fe 86 break;
bmazzeo 0:c0f52e8223fe 87
bmazzeo 0:c0f52e8223fe 88 case 1: // FIR case (ARM)
bmazzeo 0:c0f52e8223fe 89 break;
bmazzeo 0:c0f52e8223fe 90
bmazzeo 0:c0f52e8223fe 91 case 2: // FIR case (student)
bmazzeo 0:c0f52e8223fe 92 break;
bmazzeo 0:c0f52e8223fe 93
bmazzeo 0:c0f52e8223fe 94 case 3: // FFT Overlap-add
bmazzeo 0:c0f52e8223fe 95 break;
bmazzeo 0:c0f52e8223fe 96
bmazzeo 0:c0f52e8223fe 97 case 4: // FFT Overlap-add with real-imag efficiency
bmazzeo 0:c0f52e8223fe 98 break;
bmazzeo 0:c0f52e8223fe 99
bmazzeo 0:c0f52e8223fe 100
bmazzeo 0:c0f52e8223fe 101 }
bmazzeo 0:c0f52e8223fe 102 /* Change font back */
bmazzeo 0:c0f52e8223fe 103 BSP_LCD_SetFont(&Font16);
bmazzeo 0:c0f52e8223fe 104 }