R&J / Mbed OS 487_Laboratory_1

lab 1 code

Dependencies:   CMSIS-DSP_for_STM32F746G BSP_DISCO_F746NG

main.cpp@33:a0dab92ea1b9, 2020-01-06 (annotated)

Committer:
bmazzeo
Date:
Mon Jan 06 23:22:02 2020 +0000
Revision:
33:a0dab92ea1b9
Parent:
31:5a0235b66851
Child:
34:5bf89ab5e247
Slight change to improve the function specifications for Erase_Trace and Draw_Trace

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bmazzeo 9:f5b37c71856d 1 /**
bmazzeo 9:f5b37c71856d 2 ******************************************************************************
bmazzeo 9:f5b37c71856d 3 * @file main.c
bmazzeo 9:f5b37c71856d 4 * @author Brian Mazzeo
bmazzeo 23:d938f87dd1ee 5 * @date 2020
bmazzeo 9:f5b37c71856d 6 * @brief This file provides a set of code for signal processing in 487.
bmazzeo 9:f5b37c71856d 7 * Parts are taken from example code from STMIcroelectronics
bmazzeo 9:f5b37c71856d 8 ******************************************************************************
bmazzeo 9:f5b37c71856d 9 * @attention
bmazzeo 13:61131aac4031 10 * This code was specifically developed for BYU ECEn 487 course
bmazzeo 13:61131aac4031 11 * Introduction to Digital Signal Processing.
bmazzeo 9:f5b37c71856d 12 *
bmazzeo 9:f5b37c71856d 13 *
bmazzeo 9:f5b37c71856d 14 ******************************************************************************
bmazzeo 9:f5b37c71856d 15 */
bmazzeo 9:f5b37c71856d 16
bmazzeo 9:f5b37c71856d 17
adustm 0:da04816fb411 18 #include "mbed.h"
Jerome Coutant 5:66c230f74325 19 #include "stm32746g_discovery_audio.h"
Jerome Coutant 5:66c230f74325 20 #include "stm32746g_discovery_sdram.h"
bmazzeo 6:e689075b04ed 21 #include "stm32746g_discovery_lcd.h"
bmazzeo 23:d938f87dd1ee 22 #include "signal_processing.h"
adustm 0:da04816fb411 23
bmazzeo 30:debea332cdfe 24 /* The following type definitions are used to control the
bmazzeo 30:debea332cdfe 25 * buffering of the audio data using a double buffering technique.
bmazzeo 30:debea332cdfe 26 * Most of the transactions between the WM8994 and the microcontroller
bmazzeo 30:debea332cdfe 27 * are handled by other code - but this signals what the buffering state
bmazzeo 30:debea332cdfe 28 * is, so the data can be appropriately processed. */
Jerome Coutant 5:66c230f74325 29 typedef enum {
adustm 0:da04816fb411 30 BUFFER_OFFSET_NONE = 0,
adustm 0:da04816fb411 31 BUFFER_OFFSET_HALF = 1,
adustm 0:da04816fb411 32 BUFFER_OFFSET_FULL = 2,
Jerome Coutant 5:66c230f74325 33 } BUFFER_StateTypeDef;
Jerome Coutant 5:66c230f74325 34
bmazzeo 30:debea332cdfe 35 /* These audio block samples define the size of the buffering */
bmazzeo 19:479f611941a8 36 #define AUDIO_BLOCK_SAMPLES ((uint32_t)128) // Number of samples (L and R) in audio block (each samples is 16 bits)
bmazzeo 19:479f611941a8 37 #define AUDIO_BLOCK_SIZE ((uint32_t)512) // Number of bytes in audio block (4 * AUDIO_BLOCK_SAMPLES)
bmazzeo 6:e689075b04ed 38
bmazzeo 30:debea332cdfe 39 /* These RAM addresses are important to determine where the audio data is stored. */
bmazzeo 9:f5b37c71856d 40 #define SDRAM_DEVICE_ADDR_AUDIO_MEM ((uint32_t)0xC0400000)
bmazzeo 9:f5b37c71856d 41 #define AUDIO_BUFFER_IN SDRAM_DEVICE_ADDR_AUDIO_MEM
bmazzeo 9:f5b37c71856d 42 #define AUDIO_BUFFER_OUT (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE * 2))
Jerome Coutant 5:66c230f74325 43
bmazzeo 30:debea332cdfe 44 /* These definitions define the size of the oscilloscope that is used to display data. */
bmazzeo 8:d1c41eca57f0 45 #define OSC_START_X_POS 20
bmazzeo 6:e689075b04ed 46 #define OSC_LINE_SIZE 256
bmazzeo 31:5a0235b66851 47 #define OSC_Y_POS 130
bmazzeo 31:5a0235b66851 48 #define AUDIO_DRAW_LIMIT 50
bmazzeo 6:e689075b04ed 49
bmazzeo 30:debea332cdfe 50 /* This define a timer that is then used to record the timing of the different processing stages. */
bmazzeo 9:f5b37c71856d 51 Timer timer;
bmazzeo 9:f5b37c71856d 52
bmazzeo 30:debea332cdfe 53 /* This variable is important because it define the audio buffer recording state. */
Jerome Coutant 5:66c230f74325 54 volatile uint32_t audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 30:debea332cdfe 55
bmazzeo 30:debea332cdfe 56 /* Function declarations */
bmazzeo 17:eb85a2387dd4 57 static void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length);
bmazzeo 17:eb85a2387dd4 58 static void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length);
bmazzeo 16:b7dca59ab076 59 static void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length);
bmazzeo 16:b7dca59ab076 60 static void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length);
Jerome Coutant 5:66c230f74325 61
bmazzeo 30:debea332cdfe 62 /* These memory blocks are important for converting to floating point representation. */
bmazzeo 19:479f611941a8 63 float L_channel_float[AUDIO_BLOCK_SAMPLES];
bmazzeo 19:479f611941a8 64 float R_channel_float[AUDIO_BLOCK_SAMPLES];
bmazzeo 20:2ecdf687a2d1 65 float *L_channel_float_p = &L_channel_float[0];
bmazzeo 20:2ecdf687a2d1 66 float *R_channel_float_p = &R_channel_float[0];
bmazzeo 14:18f159d48340 67
bmazzeo 30:debea332cdfe 68 /* These memory blocks are where the information is stored to send back out to the WM8994 chip. */
bmazzeo 22:f36d7a53bb7e 69 uint16_t Processed_audio[AUDIO_BLOCK_SAMPLES];
bmazzeo 20:2ecdf687a2d1 70 uint16_t *Processed_audio_p = &Processed_audio[0];
bmazzeo 14:18f159d48340 71
bmazzeo 14:18f159d48340 72 /* Useful variables during looping */
bmazzeo 30:debea332cdfe 73 uint32_t counter = 0; // Loop counter
bmazzeo 30:debea332cdfe 74 char buf[40]; // Character buffer for sprintf statements to the LCD
bmazzeo 30:debea332cdfe 75 int first_half_time = 0; // Time of first processing block
bmazzeo 30:debea332cdfe 76 int second_half_time = 0; // Time of second processing block
bmazzeo 30:debea332cdfe 77 int total_time = 0; // Time of total loop (first and second blocks)
bmazzeo 9:f5b37c71856d 78
bmazzeo 30:debea332cdfe 79 /* Main Function */
adustm 0:da04816fb411 80 int main()
adustm 0:da04816fb411 81 {
bmazzeo 13:61131aac4031 82 /* Initialize the LCD Screen and display information */
bmazzeo 6:e689075b04ed 83 BSP_LCD_Init();
bmazzeo 6:e689075b04ed 84 BSP_LCD_LayerDefaultInit(LTDC_ACTIVE_LAYER, LCD_FB_START_ADDRESS);
bmazzeo 6:e689075b04ed 85 BSP_LCD_SelectLayer(LTDC_ACTIVE_LAYER);
bmazzeo 6:e689075b04ed 86
bmazzeo 30:debea332cdfe 87 /* Clear the LCD and set the font to be default */
bmazzeo 6:e689075b04ed 88 BSP_LCD_Clear(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 89 BSP_LCD_SetFont(&LCD_DEFAULT_FONT);
bmazzeo 30:debea332cdfe 90
bmazzeo 30:debea332cdfe 91 /* Set the backcolor to be black and the textcolor to be orange. */
bmazzeo 6:e689075b04ed 92 BSP_LCD_SetBackColor(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 93 BSP_LCD_SetTextColor(LCD_COLOR_ORANGE);
bmazzeo 30:debea332cdfe 94
bmazzeo 30:debea332cdfe 95 /* The following are static display elements that will remain on the screen. */
bmazzeo 31:5a0235b66851 96 BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"487 Lab 1 (student)", LEFT_MODE);
bmazzeo 30:debea332cdfe 97
bmazzeo 30:debea332cdfe 98 /* Display the L and R colors for the channels */
bmazzeo 17:eb85a2387dd4 99 BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
bmazzeo 17:eb85a2387dd4 100 BSP_LCD_DisplayStringAt(0, OSC_Y_POS - 20, (uint8_t *)"L", LEFT_MODE);
bmazzeo 17:eb85a2387dd4 101 BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
bmazzeo 17:eb85a2387dd4 102 BSP_LCD_DisplayStringAt(0, OSC_Y_POS, (uint8_t *)"R", LEFT_MODE);
bmazzeo 6:e689075b04ed 103
bmazzeo 30:debea332cdfe 104 /* The following code should not be code that you need to worry about - it sets up the audio interfaces. */
bmazzeo 30:debea332cdfe 105 /* Initialize the Audio Interface */
bmazzeo 30:debea332cdfe 106 BSP_AUDIO_IN_OUT_Init(INPUT_DEVICE_DIGITAL_MICROPHONE_2, OUTPUT_DEVICE_HEADPHONE, DEFAULT_AUDIO_IN_FREQ, DEFAULT_AUDIO_IN_BIT_RESOLUTION, DEFAULT_AUDIO_IN_CHANNEL_NBR);
bmazzeo 30:debea332cdfe 107
bmazzeo 30:debea332cdfe 108 /* Initialize SDRAM buffers */
bmazzeo 30:debea332cdfe 109 BSP_SDRAM_Init();
bmazzeo 30:debea332cdfe 110 memset((uint16_t *)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE * 2);
bmazzeo 30:debea332cdfe 111 memset((uint16_t *)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE * 2);
bmazzeo 30:debea332cdfe 112
bmazzeo 30:debea332cdfe 113 /* Start Recording */
bmazzeo 30:debea332cdfe 114 if (BSP_AUDIO_IN_Record((uint16_t *)AUDIO_BUFFER_IN, AUDIO_BLOCK_SIZE) != AUDIO_OK) { printf("BSP_AUDIO_IN_Record error\n"); }
bmazzeo 30:debea332cdfe 115
bmazzeo 30:debea332cdfe 116 /* Start Playback */
bmazzeo 30:debea332cdfe 117 BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02);
bmazzeo 30:debea332cdfe 118 if (BSP_AUDIO_OUT_Play((uint16_t *)AUDIO_BUFFER_OUT, AUDIO_BLOCK_SIZE * 2) != AUDIO_OK) { printf("BSP_AUDIO_OUT_Play error\n"); }
bmazzeo 30:debea332cdfe 119
bmazzeo 30:debea332cdfe 120 /* The audio interfaces are all now working.
bmazzeo 30:debea332cdfe 121 * Importantly - AUDIO_BUFFER_IN is the pointer to the incoming data from the WM8994
bmazzeo 30:debea332cdfe 122 * AUDIO_BUFFER_OUT is the pointer to the outgoing data to the WM8994 */
Jerome Coutant 5:66c230f74325 123
adustm 0:da04816fb411 124
bmazzeo 30:debea332cdfe 125 /* Initialize signal processing filters - usually there are variables that
bmazzeo 30:debea332cdfe 126 * need to be set up or that there are arrays you need to precompute - this
bmazzeo 30:debea332cdfe 127 * function call allows you to do that. */
bmazzeo 25:5412779376a7 128 initalize_signal_processing();
adustm 0:da04816fb411 129
bmazzeo 30:debea332cdfe 130 /* Hardware timer starts. Set to zero */
bmazzeo 9:f5b37c71856d 131 timer.start();
bmazzeo 30:debea332cdfe 132
bmazzeo 30:debea332cdfe 133 /* Main signal processing while loop */
adustm 0:da04816fb411 134 while (1) {
bmazzeo 30:debea332cdfe 135
bmazzeo 6:e689075b04ed 136 /* First Half */
bmazzeo 30:debea332cdfe 137 /* Wait until end of half block recording before going on in the first half cycle*/
bmazzeo 11:4256dbbb0c89 138 while (audio_rec_buffer_state != BUFFER_OFFSET_HALF) {}
bmazzeo 9:f5b37c71856d 139
bmazzeo 13:61131aac4031 140 /* This captures the time of an entire cycle */
bmazzeo 9:f5b37c71856d 141 total_time = timer.read_us();
bmazzeo 13:61131aac4031 142
bmazzeo 13:61131aac4031 143 /* Reset the timer counter to zero */
bmazzeo 9:f5b37c71856d 144 timer.reset();
Jerome Coutant 5:66c230f74325 145
bmazzeo 13:61131aac4031 146 /* Plot traces of first half block recording */
bmazzeo 19:479f611941a8 147 Erase_Trace(OSC_START_X_POS, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 148 Draw_Trace(OSC_START_X_POS, OSC_Y_POS, (uint16_t *) AUDIO_BUFFER_IN, AUDIO_BLOCK_SAMPLES);
bmazzeo 18:255d15af49f2 149
bmazzeo 14:18f159d48340 150 /* Convert data to floating point representation for processing */
bmazzeo 20:2ecdf687a2d1 151 Audio_to_Float((uint16_t *) AUDIO_BUFFER_IN, L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 152
bmazzeo 30:debea332cdfe 153 /* ------------------------------------------------------------------------ */
bmazzeo 30:debea332cdfe 154 /* Here is where signal processing can be done on the floating point arrays */
bmazzeo 22:f36d7a53bb7e 155
bmazzeo 30:debea332cdfe 156 process_audio_channel_signals(L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 20:2ecdf687a2d1 157
bmazzeo 30:debea332cdfe 158 /* Here is where signal processing can end on the floating point arrays */
bmazzeo 30:debea332cdfe 159 /* -------------------------------------------------------------------- */
bmazzeo 20:2ecdf687a2d1 160
bmazzeo 22:f36d7a53bb7e 161 /* Covert floating point data back to fixed point audio format */
bmazzeo 21:4dbfda694c0d 162 Float_to_Audio(L_channel_float_p, R_channel_float_p, (uint16_t *) Processed_audio, AUDIO_BLOCK_SAMPLES);
bmazzeo 14:18f159d48340 163
bmazzeo 13:61131aac4031 164 /* Copy recorded 1st half block into the audio buffer that goes out */
bmazzeo 31:5a0235b66851 165 /* Replace the second memcpy with this first one once you have worked out the processed audio functions. */
bmazzeo 31:5a0235b66851 166 //memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(Processed_audio), AUDIO_BLOCK_SIZE);
bmazzeo 31:5a0235b66851 167 memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(AUDIO_BUFFER_IN), AUDIO_BLOCK_SIZE);
bmazzeo 13:61131aac4031 168
bmazzeo 26:023edf8cea6c 169 /* Display useful cycle information (split up information display so the processing is more balanced) */
bmazzeo 26:023edf8cea6c 170 sprintf(buf, "Cycles: %9d", counter);
bmazzeo 26:023edf8cea6c 171 BSP_LCD_SetTextColor(LCD_COLOR_RED);
bmazzeo 26:023edf8cea6c 172 BSP_LCD_DisplayStringAt(0, 46, (uint8_t *) buf, LEFT_MODE);
bmazzeo 26:023edf8cea6c 173
bmazzeo 26:023edf8cea6c 174
bmazzeo 13:61131aac4031 175 /* Capture the timing of the first half processing */
bmazzeo 9:f5b37c71856d 176 first_half_time = timer.read_us();
bmazzeo 13:61131aac4031 177 /* End First Half */
bmazzeo 8:d1c41eca57f0 178
bmazzeo 6:e689075b04ed 179 /* Second Half */
adustm 0:da04816fb411 180 /* Wait end of one block recording */
bmazzeo 11:4256dbbb0c89 181 while (audio_rec_buffer_state != BUFFER_OFFSET_FULL) {}
bmazzeo 9:f5b37c71856d 182
bmazzeo 13:61131aac4031 183 /* Plot traces of second half block recording */
bmazzeo 19:479f611941a8 184 Erase_Trace(OSC_START_X_POS+AUDIO_BLOCK_SAMPLES, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 185 Draw_Trace( OSC_START_X_POS+AUDIO_BLOCK_SAMPLES, OSC_Y_POS, (uint16_t *) (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 186
bmazzeo 22:f36d7a53bb7e 187 /* Convert data to floating point representation for processing */
bmazzeo 22:f36d7a53bb7e 188 Audio_to_Float((uint16_t *) (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 189
bmazzeo 30:debea332cdfe 190 /* ------------------------------------------------------------------------ */
bmazzeo 30:debea332cdfe 191 /* Here is where signal processing can be done on the floating point arrays */
bmazzeo 22:f36d7a53bb7e 192
bmazzeo 30:debea332cdfe 193 process_audio_channel_signals(L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 194
bmazzeo 30:debea332cdfe 195 /* Here is where signal processing can end on the floating point arrays */
bmazzeo 30:debea332cdfe 196 /* -------------------------------------------------------------------- */
bmazzeo 30:debea332cdfe 197
bmazzeo 22:f36d7a53bb7e 198 /* Covert floating point data back to fixed point audio format */
bmazzeo 22:f36d7a53bb7e 199 Float_to_Audio(L_channel_float_p, R_channel_float_p, (uint16_t *) Processed_audio, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 200
bmazzeo 22:f36d7a53bb7e 201 /* Copy recorded 2nd half block into the audio buffer that goes out */
bmazzeo 31:5a0235b66851 202 //memcpy((uint16_t *)(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t *) (Processed_audio), AUDIO_BLOCK_SIZE);
bmazzeo 31:5a0235b66851 203 memcpy((uint16_t *)(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t *)(AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SIZE);
bmazzeo 31:5a0235b66851 204
bmazzeo 13:61131aac4031 205
bmazzeo 13:61131aac4031 206 /* Compute important cycle information and display it*/
bmazzeo 26:023edf8cea6c 207 sprintf(buf, "1:%6d 2:%6d T:%6d", first_half_time, second_half_time, total_time);
bmazzeo 6:e689075b04ed 208 BSP_LCD_SetTextColor(LCD_COLOR_RED);
bmazzeo 10:a82b64ea1d11 209 BSP_LCD_DisplayStringAt(0, 20, (uint8_t *) buf, LEFT_MODE);
bmazzeo 13:61131aac4031 210
bmazzeo 13:61131aac4031 211 /* Copy recorded 2nd half block into audio output buffer */
bmazzeo 18:255d15af49f2 212
bmazzeo 13:61131aac4031 213 /* Change the recording buffer state to reflect the status of the buffer */
bmazzeo 13:61131aac4031 214 audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 26:023edf8cea6c 215
bmazzeo 26:023edf8cea6c 216 /* Increase the counter */
bmazzeo 26:023edf8cea6c 217 counter++;
bmazzeo 9:f5b37c71856d 218
bmazzeo 13:61131aac4031 219 /* Measures the amount of time to process the second half */
bmazzeo 9:f5b37c71856d 220 second_half_time = timer.read_us();
bmazzeo 9:f5b37c71856d 221
bmazzeo 13:61131aac4031 222 /* End Second Half */
adustm 0:da04816fb411 223 }
adustm 0:da04816fb411 224 }
Jerome Coutant 5:66c230f74325 225
bmazzeo 7:e1dfd64eba81 226 /**
bmazzeo 7:e1dfd64eba81 227 * @brief Draws a trace of the data line.
bmazzeo 7:e1dfd64eba81 228 * @param Xpos: X position
bmazzeo 33:a0dab92ea1b9 229 * @param Ypos: Y position
bmazzeo 7:e1dfd64eba81 230 * @param Mem_start: Start of memory location
bmazzeo 7:e1dfd64eba81 231 * @param Length: length of trace
bmazzeo 7:e1dfd64eba81 232 * @retval None
bmazzeo 7:e1dfd64eba81 233 */
bmazzeo 17:eb85a2387dd4 234 void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
bmazzeo 7:e1dfd64eba81 235 {
bmazzeo 7:e1dfd64eba81 236 }
bmazzeo 7:e1dfd64eba81 237
Jerome Coutant 5:66c230f74325 238
bmazzeo 6:e689075b04ed 239 /**
bmazzeo 6:e689075b04ed 240 * @brief Draws a trace of the data line.
bmazzeo 6:e689075b04ed 241 * @param Xpos: X position
bmazzeo 33:a0dab92ea1b9 242 * @param Ypos: Y position
bmazzeo 6:e689075b04ed 243 * @param Mem_start: Start of memory location
bmazzeo 6:e689075b04ed 244 * @param Length: length of trace
bmazzeo 6:e689075b04ed 245 * @retval None
bmazzeo 6:e689075b04ed 246 */
bmazzeo 17:eb85a2387dd4 247 void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length)
bmazzeo 6:e689075b04ed 248 {
bmazzeo 6:e689075b04ed 249 }
bmazzeo 14:18f159d48340 250
bmazzeo 14:18f159d48340 251 /**
bmazzeo 14:18f159d48340 252 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 253 * @param buffer_in: Pointer to Audio buffer start location
bmazzeo 14:18f159d48340 254 * @param L_out: Pointer to Left channel out data (float)
bmazzeo 14:18f159d48340 255 * @param R_out: Pointer to Right channel out data (float)
bmazzeo 14:18f159d48340 256 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 257 * @retval None
bmazzeo 14:18f159d48340 258 */
bmazzeo 16:b7dca59ab076 259 void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length)
bmazzeo 14:18f159d48340 260 {
bmazzeo 14:18f159d48340 261 }
bmazzeo 14:18f159d48340 262
bmazzeo 14:18f159d48340 263 /**
bmazzeo 14:18f159d48340 264 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 265 * @param L_out: Pointer to Left channel in data (float)
bmazzeo 14:18f159d48340 266 * @param R_out: Pointer to Right channel in data (float)
bmazzeo 14:18f159d48340 267 * @param buffer_out: Pointer to combined 32 bit (two 16-bit int samples)
bmazzeo 14:18f159d48340 268 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 269 * @retval None
bmazzeo 14:18f159d48340 270 */
bmazzeo 16:b7dca59ab076 271 void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length)
bmazzeo 14:18f159d48340 272 {
bmazzeo 14:18f159d48340 273 }
bmazzeo 14:18f159d48340 274
bmazzeo 14:18f159d48340 275
bmazzeo 14:18f159d48340 276
bmazzeo 6:e689075b04ed 277
bmazzeo 6:e689075b04ed 278
adustm 0:da04816fb411 279 /*-------------------------------------------------------------------------------------
adustm 0:da04816fb411 280 Callbacks implementation:
adustm 0:da04816fb411 281 the callbacks API are defined __weak in the stm32746g_discovery_audio.c file
adustm 0:da04816fb411 282 and their implementation should be done in the user code if they are needed.
adustm 0:da04816fb411 283 Below some examples of callback implementations.
adustm 0:da04816fb411 284 -------------------------------------------------------------------------------------*/
adustm 0:da04816fb411 285 /**
adustm 0:da04816fb411 286 * @brief Manages the DMA Transfer complete interrupt.
adustm 0:da04816fb411 287 * @param None
adustm 0:da04816fb411 288 * @retval None
adustm 0:da04816fb411 289 */
adustm 0:da04816fb411 290 void BSP_AUDIO_IN_TransferComplete_CallBack(void)
adustm 0:da04816fb411 291 {
Jerome Coutant 5:66c230f74325 292 audio_rec_buffer_state = BUFFER_OFFSET_FULL;
adustm 0:da04816fb411 293 }
adustm 0:da04816fb411 294
adustm 0:da04816fb411 295 /**
adustm 0:da04816fb411 296 * @brief Manages the DMA Half Transfer complete interrupt.
adustm 0:da04816fb411 297 * @param None
adustm 0:da04816fb411 298 * @retval None
adustm 0:da04816fb411 299 */
adustm 0:da04816fb411 300 void BSP_AUDIO_IN_HalfTransfer_CallBack(void)
adustm 0:da04816fb411 301 {
Jerome Coutant 5:66c230f74325 302 audio_rec_buffer_state = BUFFER_OFFSET_HALF;
adustm 0:da04816fb411 303 }
adustm 0:da04816fb411 304
Jerome Coutant 5:66c230f74325 305 /**
Jerome Coutant 5:66c230f74325 306 * @brief Audio IN Error callback function.
Jerome Coutant 5:66c230f74325 307 * @param None
Jerome Coutant 5:66c230f74325 308 * @retval None
Jerome Coutant 5:66c230f74325 309 */
Jerome Coutant 5:66c230f74325 310 void BSP_AUDIO_IN_Error_CallBack(void)
adustm 0:da04816fb411 311 {
Jerome Coutant 5:66c230f74325 312 printf("BSP_AUDIO_IN_Error_CallBack\n");
adustm 0:da04816fb411 313 }