R&J / Mbed OS 487_Laboratory_1

lab 1 code

Dependencies:   CMSIS-DSP_for_STM32F746G BSP_DISCO_F746NG

main.cpp@21:4dbfda694c0d, 2019-12-31 (annotated)

Committer:
bmazzeo
Date:
Tue Dec 31 19:50:33 2019 +0000
Revision:
21:4dbfda694c0d
Parent:
20:2ecdf687a2d1
Child:
22:f36d7a53bb7e
Working audio to float conversion and float to audio conversion.

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 9:f5b37c71856d 5 * @brief This file provides a set of code for signal processing in 487.
bmazzeo 9:f5b37c71856d 6 * Parts are taken from example code from STMIcroelectronics
bmazzeo 9:f5b37c71856d 7 ******************************************************************************
bmazzeo 9:f5b37c71856d 8 * @attention
bmazzeo 13:61131aac4031 9 * This code was specifically developed for BYU ECEn 487 course
bmazzeo 13:61131aac4031 10 * Introduction to Digital Signal Processing.
bmazzeo 9:f5b37c71856d 11 *
bmazzeo 9:f5b37c71856d 12 *
bmazzeo 9:f5b37c71856d 13 ******************************************************************************
bmazzeo 9:f5b37c71856d 14 */
bmazzeo 9:f5b37c71856d 15
bmazzeo 9:f5b37c71856d 16
adustm 0:da04816fb411 17 #include "mbed.h"
Jerome Coutant 5:66c230f74325 18 #include "stm32746g_discovery_audio.h"
Jerome Coutant 5:66c230f74325 19 #include "stm32746g_discovery_sdram.h"
bmazzeo 6:e689075b04ed 20 #include "stm32746g_discovery_lcd.h"
adustm 0:da04816fb411 21
Jerome Coutant 5:66c230f74325 22 typedef enum {
adustm 0:da04816fb411 23 BUFFER_OFFSET_NONE = 0,
adustm 0:da04816fb411 24 BUFFER_OFFSET_HALF = 1,
adustm 0:da04816fb411 25 BUFFER_OFFSET_FULL = 2,
Jerome Coutant 5:66c230f74325 26 } BUFFER_StateTypeDef;
Jerome Coutant 5:66c230f74325 27
bmazzeo 19:479f611941a8 28 #define AUDIO_BLOCK_SAMPLES ((uint32_t)128) // Number of samples (L and R) in audio block (each samples is 16 bits)
bmazzeo 19:479f611941a8 29 #define AUDIO_BLOCK_SIZE ((uint32_t)512) // Number of bytes in audio block (4 * AUDIO_BLOCK_SAMPLES)
bmazzeo 6:e689075b04ed 30
bmazzeo 9:f5b37c71856d 31 #define SDRAM_DEVICE_ADDR_AUDIO_MEM ((uint32_t)0xC0400000)
bmazzeo 9:f5b37c71856d 32 #define AUDIO_BUFFER_IN SDRAM_DEVICE_ADDR_AUDIO_MEM
bmazzeo 9:f5b37c71856d 33 #define AUDIO_BUFFER_OUT (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE * 2))
Jerome Coutant 5:66c230f74325 34
bmazzeo 8:d1c41eca57f0 35 #define OSC_START_X_POS 20
bmazzeo 6:e689075b04ed 36 #define OSC_LINE_SIZE 256
bmazzeo 17:eb85a2387dd4 37 #define OSC_Y_POS 110
bmazzeo 7:e1dfd64eba81 38 #define AUDIO_DRAW_LIMIT 30
bmazzeo 6:e689075b04ed 39
bmazzeo 9:f5b37c71856d 40 Timer timer;
bmazzeo 9:f5b37c71856d 41
Jerome Coutant 5:66c230f74325 42 volatile uint32_t audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 17:eb85a2387dd4 43 static void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length);
bmazzeo 17:eb85a2387dd4 44 static void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length);
bmazzeo 16:b7dca59ab076 45 static void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length);
bmazzeo 16:b7dca59ab076 46 static void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length);
Jerome Coutant 5:66c230f74325 47
bmazzeo 20:2ecdf687a2d1 48 /* To do conversion to float */
bmazzeo 19:479f611941a8 49 float L_channel_float[AUDIO_BLOCK_SAMPLES];
bmazzeo 19:479f611941a8 50 float R_channel_float[AUDIO_BLOCK_SAMPLES];
bmazzeo 20:2ecdf687a2d1 51 float *L_channel_float_p = &L_channel_float[0];
bmazzeo 20:2ecdf687a2d1 52 float *R_channel_float_p = &R_channel_float[0];
bmazzeo 14:18f159d48340 53
bmazzeo 14:18f159d48340 54 /* Back conversion to integer */
bmazzeo 20:2ecdf687a2d1 55 uint16_t Processed_audio[AUDIO_BLOCK_SAMPLES * 2];
bmazzeo 20:2ecdf687a2d1 56 uint16_t *Processed_audio_p = &Processed_audio[0];
bmazzeo 14:18f159d48340 57
bmazzeo 14:18f159d48340 58 /* Useful variables during looping */
bmazzeo 9:f5b37c71856d 59 uint32_t counter = 0;
bmazzeo 10:a82b64ea1d11 60 char buf[40];
bmazzeo 13:61131aac4031 61 int first_half_time = 0;
bmazzeo 13:61131aac4031 62 int second_half_time = 0;
bmazzeo 13:61131aac4031 63 int total_time = 0;
bmazzeo 9:f5b37c71856d 64
adustm 0:da04816fb411 65 int main()
adustm 0:da04816fb411 66 {
bmazzeo 13:61131aac4031 67 /* Initialize the LCD Screen and display information */
bmazzeo 6:e689075b04ed 68 BSP_LCD_Init();
bmazzeo 6:e689075b04ed 69 BSP_LCD_LayerDefaultInit(LTDC_ACTIVE_LAYER, LCD_FB_START_ADDRESS);
bmazzeo 6:e689075b04ed 70 BSP_LCD_SelectLayer(LTDC_ACTIVE_LAYER);
bmazzeo 6:e689075b04ed 71
bmazzeo 6:e689075b04ed 72 BSP_LCD_Clear(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 73 BSP_LCD_SetFont(&LCD_DEFAULT_FONT);
bmazzeo 6:e689075b04ed 74
bmazzeo 6:e689075b04ed 75 BSP_LCD_SetBackColor(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 76 BSP_LCD_SetTextColor(LCD_COLOR_ORANGE);
bmazzeo 7:e1dfd64eba81 77 BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"487 Mic Audio Test Code", LEFT_MODE);
bmazzeo 17:eb85a2387dd4 78 BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
bmazzeo 17:eb85a2387dd4 79 BSP_LCD_DisplayStringAt(0, OSC_Y_POS - 20, (uint8_t *)"L", LEFT_MODE);
bmazzeo 17:eb85a2387dd4 80 BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
bmazzeo 17:eb85a2387dd4 81 BSP_LCD_DisplayStringAt(0, OSC_Y_POS, (uint8_t *)"R", LEFT_MODE);
bmazzeo 6:e689075b04ed 82
bmazzeo 13:61131aac4031 83
bmazzeo 13:61131aac4031 84 /* Initialize the Audio Interface */
Jerome Coutant 5:66c230f74325 85 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);
adustm 0:da04816fb411 86
adustm 0:da04816fb411 87 /* Initialize SDRAM buffers */
Jerome Coutant 5:66c230f74325 88 BSP_SDRAM_Init();
Jerome Coutant 5:66c230f74325 89 memset((uint16_t *)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE * 2);
Jerome Coutant 5:66c230f74325 90 memset((uint16_t *)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE * 2);
Jerome Coutant 5:66c230f74325 91
adustm 0:da04816fb411 92
adustm 0:da04816fb411 93 /* Start Recording */
bmazzeo 13:61131aac4031 94 if (BSP_AUDIO_IN_Record((uint16_t *)AUDIO_BUFFER_IN, AUDIO_BLOCK_SIZE) != AUDIO_OK) { printf("BSP_AUDIO_IN_Record error\n"); }
adustm 0:da04816fb411 95
adustm 0:da04816fb411 96 /* Start Playback */
Jerome Coutant 5:66c230f74325 97 BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02);
bmazzeo 13:61131aac4031 98 if (BSP_AUDIO_OUT_Play((uint16_t *)AUDIO_BUFFER_OUT, AUDIO_BLOCK_SIZE * 2) != AUDIO_OK) { printf("BSP_AUDIO_OUT_Play error\n"); }
bmazzeo 13:61131aac4031 99
adustm 0:da04816fb411 100
bmazzeo 9:f5b37c71856d 101 timer.start();
adustm 0:da04816fb411 102 while (1) {
bmazzeo 6:e689075b04ed 103 /* First Half */
bmazzeo 13:61131aac4031 104 /* Wait end of half block recording before going on in the first half cycle*/
bmazzeo 11:4256dbbb0c89 105 while (audio_rec_buffer_state != BUFFER_OFFSET_HALF) {}
bmazzeo 9:f5b37c71856d 106
bmazzeo 13:61131aac4031 107 /* This captures the time of an entire cycle */
bmazzeo 9:f5b37c71856d 108 total_time = timer.read_us();
bmazzeo 13:61131aac4031 109
bmazzeo 13:61131aac4031 110 /* Reset the timer counter to zero */
bmazzeo 9:f5b37c71856d 111 timer.reset();
Jerome Coutant 5:66c230f74325 112
bmazzeo 13:61131aac4031 113 /* Plot traces of first half block recording */
bmazzeo 19:479f611941a8 114 Erase_Trace(OSC_START_X_POS, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 115 Draw_Trace(OSC_START_X_POS, OSC_Y_POS, (uint16_t *) AUDIO_BUFFER_IN, AUDIO_BLOCK_SAMPLES);
bmazzeo 18:255d15af49f2 116
bmazzeo 14:18f159d48340 117 /* Convert data to floating point representation for processing */
bmazzeo 20:2ecdf687a2d1 118 Audio_to_Float((uint16_t *) AUDIO_BUFFER_IN, L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 20:2ecdf687a2d1 119
bmazzeo 20:2ecdf687a2d1 120 sprintf(buf, "Lf[0]:%8.1f Ai[0]:%6d ", L_channel_float[0], ((int16_t) *((uint16_t *) AUDIO_BUFFER_IN)));
bmazzeo 20:2ecdf687a2d1 121 BSP_LCD_DisplayStringAt(0, 150, (uint8_t *) buf, LEFT_MODE);
bmazzeo 20:2ecdf687a2d1 122
bmazzeo 21:4dbfda694c0d 123 Float_to_Audio(L_channel_float_p, R_channel_float_p, (uint16_t *) Processed_audio, AUDIO_BLOCK_SAMPLES);
bmazzeo 14:18f159d48340 124
bmazzeo 13:61131aac4031 125 /* Copy recorded 1st half block into the audio buffer that goes out */
bmazzeo 21:4dbfda694c0d 126 //memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(AUDIO_BUFFER_IN), AUDIO_BLOCK_SIZE);
bmazzeo 21:4dbfda694c0d 127 memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(Processed_audio), AUDIO_BLOCK_SIZE);
bmazzeo 13:61131aac4031 128
bmazzeo 13:61131aac4031 129 /* Capture the timing of the first half processing */
bmazzeo 9:f5b37c71856d 130 first_half_time = timer.read_us();
bmazzeo 13:61131aac4031 131 /* End First Half */
bmazzeo 8:d1c41eca57f0 132
bmazzeo 6:e689075b04ed 133 /* Second Half */
adustm 0:da04816fb411 134 /* Wait end of one block recording */
bmazzeo 11:4256dbbb0c89 135 while (audio_rec_buffer_state != BUFFER_OFFSET_FULL) {}
bmazzeo 9:f5b37c71856d 136
bmazzeo 13:61131aac4031 137 /* Plot traces of second half block recording */
bmazzeo 19:479f611941a8 138 Erase_Trace(OSC_START_X_POS+AUDIO_BLOCK_SAMPLES, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 139 Draw_Trace( OSC_START_X_POS+AUDIO_BLOCK_SAMPLES, OSC_Y_POS, (uint16_t *) (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SAMPLES);
bmazzeo 13:61131aac4031 140
bmazzeo 13:61131aac4031 141 /* Compute important cycle information and display it*/
bmazzeo 6:e689075b04ed 142 counter++;
bmazzeo 10:a82b64ea1d11 143 sprintf(buf, "Cycles: %9d", counter);
bmazzeo 6:e689075b04ed 144 BSP_LCD_SetTextColor(LCD_COLOR_RED);
bmazzeo 10:a82b64ea1d11 145 BSP_LCD_DisplayStringAt(0, 46, (uint8_t *) buf, LEFT_MODE);
bmazzeo 10:a82b64ea1d11 146 sprintf(buf, "1:%6d 2:%6d T:%6d", first_half_time, second_half_time, total_time);
bmazzeo 10:a82b64ea1d11 147 BSP_LCD_DisplayStringAt(0, 20, (uint8_t *) buf, LEFT_MODE);
bmazzeo 13:61131aac4031 148
bmazzeo 13:61131aac4031 149 /* Copy recorded 2nd half block into audio output buffer */
bmazzeo 13:61131aac4031 150 memcpy((uint16_t *)(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t *)(AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SIZE);
bmazzeo 18:255d15af49f2 151
bmazzeo 13:61131aac4031 152 /* Change the recording buffer state to reflect the status of the buffer */
bmazzeo 13:61131aac4031 153 audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 9:f5b37c71856d 154
bmazzeo 13:61131aac4031 155 /* Measures the amount of time to process the second half */
bmazzeo 9:f5b37c71856d 156 second_half_time = timer.read_us();
bmazzeo 9:f5b37c71856d 157
bmazzeo 13:61131aac4031 158 /* End Second Half */
adustm 0:da04816fb411 159 }
adustm 0:da04816fb411 160 }
Jerome Coutant 5:66c230f74325 161
bmazzeo 7:e1dfd64eba81 162 /**
bmazzeo 7:e1dfd64eba81 163 * @brief Draws a trace of the data line.
bmazzeo 7:e1dfd64eba81 164 * @param Xpos: X position
bmazzeo 7:e1dfd64eba81 165 * @param L_Ypos: Left channel Y position
bmazzeo 7:e1dfd64eba81 166 * @param R_Ypos: Right channel Y position
bmazzeo 7:e1dfd64eba81 167 * @param Mem_start: Start of memory location
bmazzeo 7:e1dfd64eba81 168 * @param Length: length of trace
bmazzeo 7:e1dfd64eba81 169 * @retval None
bmazzeo 7:e1dfd64eba81 170 */
bmazzeo 17:eb85a2387dd4 171 void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
bmazzeo 7:e1dfd64eba81 172 {
bmazzeo 7:e1dfd64eba81 173 BSP_LCD_SetTextColor(LCD_COLOR_BROWN);
bmazzeo 17:eb85a2387dd4 174 BSP_LCD_FillRect(Xpos, Ypos - AUDIO_DRAW_LIMIT, Length, AUDIO_DRAW_LIMIT);
bmazzeo 17:eb85a2387dd4 175 BSP_LCD_FillRect(Xpos, Ypos+1, Length, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 176
bmazzeo 17:eb85a2387dd4 177 BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
bmazzeo 17:eb85a2387dd4 178 BSP_LCD_DrawHLine(Xpos, Ypos, Length);
bmazzeo 7:e1dfd64eba81 179
bmazzeo 7:e1dfd64eba81 180 }
bmazzeo 7:e1dfd64eba81 181
Jerome Coutant 5:66c230f74325 182
bmazzeo 6:e689075b04ed 183 /**
bmazzeo 6:e689075b04ed 184 * @brief Draws a trace of the data line.
bmazzeo 6:e689075b04ed 185 * @param Xpos: X position
bmazzeo 7:e1dfd64eba81 186 * @param L_Ypos: Left channel Y position
bmazzeo 7:e1dfd64eba81 187 * @param R_Ypos: Right channel Y position
bmazzeo 6:e689075b04ed 188 * @param Mem_start: Start of memory location
bmazzeo 6:e689075b04ed 189 * @param Length: length of trace
bmazzeo 6:e689075b04ed 190 * @retval None
bmazzeo 6:e689075b04ed 191 */
bmazzeo 17:eb85a2387dd4 192 void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length)
bmazzeo 6:e689075b04ed 193 {
bmazzeo 7:e1dfd64eba81 194 uint16_t i;
bmazzeo 18:255d15af49f2 195 uint16_t* mem_address;
bmazzeo 7:e1dfd64eba81 196 char buf[10];
bmazzeo 7:e1dfd64eba81 197 int16_t L_audio_value;
bmazzeo 7:e1dfd64eba81 198 int16_t R_audio_value;
bmazzeo 20:2ecdf687a2d1 199
bmazzeo 18:255d15af49f2 200 mem_address = Mem_start;
bmazzeo 7:e1dfd64eba81 201
bmazzeo 8:d1c41eca57f0 202 for (i=0; i<Length; i++)
bmazzeo 20:2ecdf687a2d1 203 {
bmazzeo 18:255d15af49f2 204 L_audio_value = (int16_t) *mem_address;
bmazzeo 18:255d15af49f2 205 mem_address++;
bmazzeo 18:255d15af49f2 206 R_audio_value = (int16_t) *mem_address;
bmazzeo 18:255d15af49f2 207 mem_address++;
bmazzeo 7:e1dfd64eba81 208
bmazzeo 17:eb85a2387dd4 209 L_audio_value = L_audio_value / 100;
bmazzeo 17:eb85a2387dd4 210 R_audio_value = R_audio_value / 100;
bmazzeo 7:e1dfd64eba81 211
bmazzeo 7:e1dfd64eba81 212 if (L_audio_value > AUDIO_DRAW_LIMIT) {L_audio_value = AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 213 else if (L_audio_value < -AUDIO_DRAW_LIMIT) {L_audio_value = -AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 214
bmazzeo 7:e1dfd64eba81 215 if (R_audio_value > AUDIO_DRAW_LIMIT) {R_audio_value = AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 216 else if (R_audio_value < -AUDIO_DRAW_LIMIT) {R_audio_value = -AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 217
bmazzeo 17:eb85a2387dd4 218 BSP_LCD_DrawPixel(Xpos + i, (uint16_t) ((int16_t) Ypos + L_audio_value), LCD_COLOR_BLUE);
bmazzeo 17:eb85a2387dd4 219 BSP_LCD_DrawPixel(Xpos + i, (uint16_t) ((int16_t) Ypos + R_audio_value), LCD_COLOR_GREEN);
bmazzeo 6:e689075b04ed 220 }
bmazzeo 6:e689075b04ed 221
bmazzeo 6:e689075b04ed 222 }
bmazzeo 14:18f159d48340 223
bmazzeo 14:18f159d48340 224 /**
bmazzeo 14:18f159d48340 225 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 226 * @param buffer_in: Pointer to Audio buffer start location
bmazzeo 14:18f159d48340 227 * @param L_out: Pointer to Left channel out data (float)
bmazzeo 14:18f159d48340 228 * @param R_out: Pointer to Right channel out data (float)
bmazzeo 14:18f159d48340 229 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 230 * @retval None
bmazzeo 14:18f159d48340 231 */
bmazzeo 16:b7dca59ab076 232 void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length)
bmazzeo 14:18f159d48340 233 {
bmazzeo 14:18f159d48340 234 uint16_t i;
bmazzeo 16:b7dca59ab076 235 uint16_t* audio_mem_address;
bmazzeo 20:2ecdf687a2d1 236 float* L_chan_mem_address;
bmazzeo 20:2ecdf687a2d1 237 float* R_chan_mem_address;
bmazzeo 14:18f159d48340 238 float L_audio_value;
bmazzeo 14:18f159d48340 239 float R_audio_value;
bmazzeo 20:2ecdf687a2d1 240
bmazzeo 20:2ecdf687a2d1 241 audio_mem_address = buffer_in;
bmazzeo 20:2ecdf687a2d1 242 L_chan_mem_address = L_out;
bmazzeo 20:2ecdf687a2d1 243 R_chan_mem_address = R_out;
bmazzeo 6:e689075b04ed 244
bmazzeo 14:18f159d48340 245 for (i=0; i<Length; i++)
bmazzeo 14:18f159d48340 246 {
bmazzeo 20:2ecdf687a2d1 247 L_audio_value = (float) ((int16_t) *audio_mem_address);
bmazzeo 20:2ecdf687a2d1 248 audio_mem_address++;
bmazzeo 20:2ecdf687a2d1 249 R_audio_value = (float) ((int16_t) *audio_mem_address);
bmazzeo 20:2ecdf687a2d1 250 audio_mem_address++;
bmazzeo 14:18f159d48340 251
bmazzeo 16:b7dca59ab076 252 *L_chan_mem_address = L_audio_value;
bmazzeo 20:2ecdf687a2d1 253 L_chan_mem_address++;
bmazzeo 20:2ecdf687a2d1 254
bmazzeo 14:18f159d48340 255 *R_chan_mem_address = R_audio_value;
bmazzeo 20:2ecdf687a2d1 256 R_chan_mem_address++;
bmazzeo 14:18f159d48340 257 }
bmazzeo 14:18f159d48340 258 }
bmazzeo 14:18f159d48340 259
bmazzeo 14:18f159d48340 260 /**
bmazzeo 14:18f159d48340 261 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 262 * @param L_out: Pointer to Left channel in data (float)
bmazzeo 14:18f159d48340 263 * @param R_out: Pointer to Right channel in data (float)
bmazzeo 14:18f159d48340 264 * @param buffer_out: Pointer to combined 32 bit (two 16-bit int samples)
bmazzeo 14:18f159d48340 265 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 266 * @retval None
bmazzeo 14:18f159d48340 267 */
bmazzeo 16:b7dca59ab076 268 void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length)
bmazzeo 14:18f159d48340 269 {
bmazzeo 14:18f159d48340 270 uint16_t i;
bmazzeo 14:18f159d48340 271 uint16_t* audio_mem_address;
bmazzeo 21:4dbfda694c0d 272 float* L_chan_mem_address;
bmazzeo 21:4dbfda694c0d 273 float* R_chan_mem_address;
bmazzeo 21:4dbfda694c0d 274 int16_t L_audio_value;
bmazzeo 21:4dbfda694c0d 275 int16_t R_audio_value;
bmazzeo 21:4dbfda694c0d 276
bmazzeo 21:4dbfda694c0d 277 audio_mem_address = buffer_out;
bmazzeo 21:4dbfda694c0d 278 L_chan_mem_address = L_in;
bmazzeo 21:4dbfda694c0d 279 R_chan_mem_address = R_in;
bmazzeo 14:18f159d48340 280
bmazzeo 14:18f159d48340 281 for (i=0; i<Length; i++)
bmazzeo 14:18f159d48340 282 {
bmazzeo 21:4dbfda694c0d 283 L_audio_value = (int16_t) ((float) *L_chan_mem_address);
bmazzeo 21:4dbfda694c0d 284 L_chan_mem_address++;
bmazzeo 14:18f159d48340 285
bmazzeo 21:4dbfda694c0d 286 R_audio_value = (int16_t) ((float) *R_chan_mem_address);
bmazzeo 21:4dbfda694c0d 287 R_chan_mem_address++;
bmazzeo 21:4dbfda694c0d 288
bmazzeo 21:4dbfda694c0d 289 *audio_mem_address = (uint16_t) L_audio_value;
bmazzeo 21:4dbfda694c0d 290 audio_mem_address++;
bmazzeo 21:4dbfda694c0d 291 *audio_mem_address = (uint16_t) R_audio_value;
bmazzeo 21:4dbfda694c0d 292 audio_mem_address++;
bmazzeo 14:18f159d48340 293 }
bmazzeo 14:18f159d48340 294 }
bmazzeo 14:18f159d48340 295
bmazzeo 14:18f159d48340 296
bmazzeo 14:18f159d48340 297
bmazzeo 6:e689075b04ed 298
bmazzeo 6:e689075b04ed 299
adustm 0:da04816fb411 300 /*-------------------------------------------------------------------------------------
adustm 0:da04816fb411 301 Callbacks implementation:
adustm 0:da04816fb411 302 the callbacks API are defined __weak in the stm32746g_discovery_audio.c file
adustm 0:da04816fb411 303 and their implementation should be done in the user code if they are needed.
adustm 0:da04816fb411 304 Below some examples of callback implementations.
adustm 0:da04816fb411 305 -------------------------------------------------------------------------------------*/
adustm 0:da04816fb411 306 /**
adustm 0:da04816fb411 307 * @brief Manages the DMA Transfer complete interrupt.
adustm 0:da04816fb411 308 * @param None
adustm 0:da04816fb411 309 * @retval None
adustm 0:da04816fb411 310 */
adustm 0:da04816fb411 311 void BSP_AUDIO_IN_TransferComplete_CallBack(void)
adustm 0:da04816fb411 312 {
Jerome Coutant 5:66c230f74325 313 audio_rec_buffer_state = BUFFER_OFFSET_FULL;
adustm 0:da04816fb411 314 }
adustm 0:da04816fb411 315
adustm 0:da04816fb411 316 /**
adustm 0:da04816fb411 317 * @brief Manages the DMA Half Transfer complete interrupt.
adustm 0:da04816fb411 318 * @param None
adustm 0:da04816fb411 319 * @retval None
adustm 0:da04816fb411 320 */
adustm 0:da04816fb411 321 void BSP_AUDIO_IN_HalfTransfer_CallBack(void)
adustm 0:da04816fb411 322 {
Jerome Coutant 5:66c230f74325 323 audio_rec_buffer_state = BUFFER_OFFSET_HALF;
adustm 0:da04816fb411 324 }
adustm 0:da04816fb411 325
Jerome Coutant 5:66c230f74325 326 /**
Jerome Coutant 5:66c230f74325 327 * @brief Audio IN Error callback function.
Jerome Coutant 5:66c230f74325 328 * @param None
Jerome Coutant 5:66c230f74325 329 * @retval None
Jerome Coutant 5:66c230f74325 330 */
Jerome Coutant 5:66c230f74325 331 void BSP_AUDIO_IN_Error_CallBack(void)
adustm 0:da04816fb411 332 {
Jerome Coutant 5:66c230f74325 333 printf("BSP_AUDIO_IN_Error_CallBack\n");
adustm 0:da04816fb411 334 }