R&J / Mbed OS 487_Laboratory_1

lab 1 code

Dependencies:   CMSIS-DSP_for_STM32F746G BSP_DISCO_F746NG

main.cpp@19:479f611941a8, 2019-12-31 (annotated)

Committer:
bmazzeo
Date:
Tue Dec 31 18:52:01 2019 +0000
Revision:
19:479f611941a8
Parent:
18:255d15af49f2
Child:
20:2ecdf687a2d1
Cleaned up version before starting float 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 14:18f159d48340 48 /* To do converstion 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 14:18f159d48340 51
bmazzeo 14:18f159d48340 52 /* Back conversion to integer */
bmazzeo 19:479f611941a8 53 uint16_t Processed_audio[AUDIO_BLOCK_SAMPLES * 2];
bmazzeo 14:18f159d48340 54
bmazzeo 14:18f159d48340 55 /* Useful variables during looping */
bmazzeo 9:f5b37c71856d 56 uint32_t counter = 0;
bmazzeo 10:a82b64ea1d11 57 char buf[40];
bmazzeo 13:61131aac4031 58 int first_half_time = 0;
bmazzeo 13:61131aac4031 59 int second_half_time = 0;
bmazzeo 13:61131aac4031 60 int total_time = 0;
bmazzeo 9:f5b37c71856d 61
adustm 0:da04816fb411 62 int main()
adustm 0:da04816fb411 63 {
bmazzeo 13:61131aac4031 64 /* Initialize the LCD Screen and display information */
bmazzeo 6:e689075b04ed 65 BSP_LCD_Init();
bmazzeo 6:e689075b04ed 66 BSP_LCD_LayerDefaultInit(LTDC_ACTIVE_LAYER, LCD_FB_START_ADDRESS);
bmazzeo 6:e689075b04ed 67 BSP_LCD_SelectLayer(LTDC_ACTIVE_LAYER);
bmazzeo 6:e689075b04ed 68
bmazzeo 6:e689075b04ed 69 BSP_LCD_Clear(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 70 BSP_LCD_SetFont(&LCD_DEFAULT_FONT);
bmazzeo 6:e689075b04ed 71
bmazzeo 6:e689075b04ed 72 BSP_LCD_SetBackColor(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 73 BSP_LCD_SetTextColor(LCD_COLOR_ORANGE);
bmazzeo 7:e1dfd64eba81 74 BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"487 Mic Audio Test Code", LEFT_MODE);
bmazzeo 17:eb85a2387dd4 75 BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
bmazzeo 17:eb85a2387dd4 76 BSP_LCD_DisplayStringAt(0, OSC_Y_POS - 20, (uint8_t *)"L", LEFT_MODE);
bmazzeo 17:eb85a2387dd4 77 BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
bmazzeo 17:eb85a2387dd4 78 BSP_LCD_DisplayStringAt(0, OSC_Y_POS, (uint8_t *)"R", LEFT_MODE);
bmazzeo 6:e689075b04ed 79
bmazzeo 13:61131aac4031 80
bmazzeo 13:61131aac4031 81 /* Initialize the Audio Interface */
Jerome Coutant 5:66c230f74325 82 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 83
adustm 0:da04816fb411 84 /* Initialize SDRAM buffers */
Jerome Coutant 5:66c230f74325 85 BSP_SDRAM_Init();
Jerome Coutant 5:66c230f74325 86 memset((uint16_t *)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE * 2);
Jerome Coutant 5:66c230f74325 87 memset((uint16_t *)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE * 2);
Jerome Coutant 5:66c230f74325 88
adustm 0:da04816fb411 89
adustm 0:da04816fb411 90 /* Start Recording */
bmazzeo 13:61131aac4031 91 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 92
adustm 0:da04816fb411 93 /* Start Playback */
Jerome Coutant 5:66c230f74325 94 BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02);
bmazzeo 13:61131aac4031 95 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 96
adustm 0:da04816fb411 97
bmazzeo 9:f5b37c71856d 98 timer.start();
adustm 0:da04816fb411 99 while (1) {
bmazzeo 6:e689075b04ed 100 /* First Half */
bmazzeo 13:61131aac4031 101 /* Wait end of half block recording before going on in the first half cycle*/
bmazzeo 11:4256dbbb0c89 102 while (audio_rec_buffer_state != BUFFER_OFFSET_HALF) {}
bmazzeo 9:f5b37c71856d 103
bmazzeo 13:61131aac4031 104 /* This captures the time of an entire cycle */
bmazzeo 9:f5b37c71856d 105 total_time = timer.read_us();
bmazzeo 13:61131aac4031 106
bmazzeo 13:61131aac4031 107 /* Reset the timer counter to zero */
bmazzeo 9:f5b37c71856d 108 timer.reset();
Jerome Coutant 5:66c230f74325 109
bmazzeo 13:61131aac4031 110 /* Plot traces of first half block recording */
bmazzeo 19:479f611941a8 111 Erase_Trace(OSC_START_X_POS, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 112 Draw_Trace(OSC_START_X_POS, OSC_Y_POS, (uint16_t *) AUDIO_BUFFER_IN, AUDIO_BLOCK_SAMPLES);
bmazzeo 18:255d15af49f2 113
bmazzeo 14:18f159d48340 114 /* Convert data to floating point representation for processing */
bmazzeo 19:479f611941a8 115 //Audio_to_Float((uint16_t *) AUDIO_BUFFER_IN, (float *) L_channel_float, (float *) R_channel_float, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 116 //Float_to_Audio((float *) L_channel_float, (float *) R_channel_float, (uint16_t *) Processed_audio, AUDIO_BLOCK_SAMPLES);
bmazzeo 14:18f159d48340 117
bmazzeo 13:61131aac4031 118 /* Copy recorded 1st half block into the audio buffer that goes out */
bmazzeo 16:b7dca59ab076 119 memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(AUDIO_BUFFER_IN), AUDIO_BLOCK_SIZE);
bmazzeo 13:61131aac4031 120
bmazzeo 13:61131aac4031 121 /* Capture the timing of the first half processing */
bmazzeo 9:f5b37c71856d 122 first_half_time = timer.read_us();
bmazzeo 13:61131aac4031 123 /* End First Half */
bmazzeo 8:d1c41eca57f0 124
bmazzeo 6:e689075b04ed 125 /* Second Half */
adustm 0:da04816fb411 126 /* Wait end of one block recording */
bmazzeo 11:4256dbbb0c89 127 while (audio_rec_buffer_state != BUFFER_OFFSET_FULL) {}
bmazzeo 9:f5b37c71856d 128
bmazzeo 13:61131aac4031 129 /* Plot traces of second half block recording */
bmazzeo 19:479f611941a8 130 Erase_Trace(OSC_START_X_POS+AUDIO_BLOCK_SAMPLES, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 131 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 132
bmazzeo 13:61131aac4031 133 /* Compute important cycle information and display it*/
bmazzeo 6:e689075b04ed 134 counter++;
bmazzeo 10:a82b64ea1d11 135 sprintf(buf, "Cycles: %9d", counter);
bmazzeo 6:e689075b04ed 136 BSP_LCD_SetTextColor(LCD_COLOR_RED);
bmazzeo 10:a82b64ea1d11 137 BSP_LCD_DisplayStringAt(0, 46, (uint8_t *) buf, LEFT_MODE);
bmazzeo 10:a82b64ea1d11 138 sprintf(buf, "1:%6d 2:%6d T:%6d", first_half_time, second_half_time, total_time);
bmazzeo 10:a82b64ea1d11 139 BSP_LCD_DisplayStringAt(0, 20, (uint8_t *) buf, LEFT_MODE);
bmazzeo 13:61131aac4031 140
bmazzeo 13:61131aac4031 141 /* Copy recorded 2nd half block into audio output buffer */
bmazzeo 13:61131aac4031 142 memcpy((uint16_t *)(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t *)(AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SIZE);
bmazzeo 18:255d15af49f2 143
bmazzeo 13:61131aac4031 144 /* Change the recording buffer state to reflect the status of the buffer */
bmazzeo 13:61131aac4031 145 audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 9:f5b37c71856d 146
bmazzeo 13:61131aac4031 147 /* Measures the amount of time to process the second half */
bmazzeo 9:f5b37c71856d 148 second_half_time = timer.read_us();
bmazzeo 9:f5b37c71856d 149
bmazzeo 13:61131aac4031 150 /* End Second Half */
adustm 0:da04816fb411 151 }
adustm 0:da04816fb411 152 }
Jerome Coutant 5:66c230f74325 153
bmazzeo 7:e1dfd64eba81 154 /**
bmazzeo 7:e1dfd64eba81 155 * @brief Draws a trace of the data line.
bmazzeo 7:e1dfd64eba81 156 * @param Xpos: X position
bmazzeo 7:e1dfd64eba81 157 * @param L_Ypos: Left channel Y position
bmazzeo 7:e1dfd64eba81 158 * @param R_Ypos: Right channel Y position
bmazzeo 7:e1dfd64eba81 159 * @param Mem_start: Start of memory location
bmazzeo 7:e1dfd64eba81 160 * @param Length: length of trace
bmazzeo 7:e1dfd64eba81 161 * @retval None
bmazzeo 7:e1dfd64eba81 162 */
bmazzeo 17:eb85a2387dd4 163 void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
bmazzeo 7:e1dfd64eba81 164 {
bmazzeo 7:e1dfd64eba81 165 BSP_LCD_SetTextColor(LCD_COLOR_BROWN);
bmazzeo 17:eb85a2387dd4 166 BSP_LCD_FillRect(Xpos, Ypos - AUDIO_DRAW_LIMIT, Length, AUDIO_DRAW_LIMIT);
bmazzeo 17:eb85a2387dd4 167 BSP_LCD_FillRect(Xpos, Ypos+1, Length, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 168
bmazzeo 17:eb85a2387dd4 169 BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
bmazzeo 17:eb85a2387dd4 170 BSP_LCD_DrawHLine(Xpos, Ypos, Length);
bmazzeo 7:e1dfd64eba81 171
bmazzeo 7:e1dfd64eba81 172 }
bmazzeo 7:e1dfd64eba81 173
Jerome Coutant 5:66c230f74325 174
bmazzeo 6:e689075b04ed 175 /**
bmazzeo 6:e689075b04ed 176 * @brief Draws a trace of the data line.
bmazzeo 6:e689075b04ed 177 * @param Xpos: X position
bmazzeo 7:e1dfd64eba81 178 * @param L_Ypos: Left channel Y position
bmazzeo 7:e1dfd64eba81 179 * @param R_Ypos: Right channel Y position
bmazzeo 6:e689075b04ed 180 * @param Mem_start: Start of memory location
bmazzeo 6:e689075b04ed 181 * @param Length: length of trace
bmazzeo 6:e689075b04ed 182 * @retval None
bmazzeo 6:e689075b04ed 183 */
bmazzeo 17:eb85a2387dd4 184 void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length)
bmazzeo 6:e689075b04ed 185 {
bmazzeo 7:e1dfd64eba81 186 uint16_t i;
bmazzeo 7:e1dfd64eba81 187 uint32_t data_value;
bmazzeo 18:255d15af49f2 188 uint16_t* mem_address;
bmazzeo 7:e1dfd64eba81 189 char buf[10];
bmazzeo 7:e1dfd64eba81 190 int16_t L_audio_value;
bmazzeo 7:e1dfd64eba81 191 int16_t R_audio_value;
bmazzeo 6:e689075b04ed 192
bmazzeo 16:b7dca59ab076 193 //data_value = *((uint32_t*) Mem_start);
bmazzeo 16:b7dca59ab076 194 //L_audio_value = (int16_t) ((data_value >> 16) & 0xFFFF);
bmazzeo 16:b7dca59ab076 195 //R_audio_value = (int16_t) (data_value & 0xFFFF);
bmazzeo 18:255d15af49f2 196
bmazzeo 18:255d15af49f2 197 mem_address = Mem_start;
bmazzeo 7:e1dfd64eba81 198
bmazzeo 8:d1c41eca57f0 199 for (i=0; i<Length; i++)
bmazzeo 6:e689075b04ed 200 {
bmazzeo 18:255d15af49f2 201 //mem_address = (uint32_t*) Mem_start + i;
bmazzeo 18:255d15af49f2 202 //data_value = *((uint16_t*) mem_address);
bmazzeo 18:255d15af49f2 203 //L_audio_value = (int16_t) ((data_value >> 16) & 0xFFFF);
bmazzeo 18:255d15af49f2 204 //R_audio_value = (int16_t) (data_value & 0xFFFF);
bmazzeo 18:255d15af49f2 205
bmazzeo 18:255d15af49f2 206 L_audio_value = (int16_t) *mem_address;
bmazzeo 18:255d15af49f2 207 mem_address++;
bmazzeo 18:255d15af49f2 208 R_audio_value = (int16_t) *mem_address;
bmazzeo 18:255d15af49f2 209 mem_address++;
bmazzeo 7:e1dfd64eba81 210
bmazzeo 17:eb85a2387dd4 211 L_audio_value = L_audio_value / 100;
bmazzeo 17:eb85a2387dd4 212 R_audio_value = R_audio_value / 100;
bmazzeo 7:e1dfd64eba81 213
bmazzeo 7:e1dfd64eba81 214 if (L_audio_value > AUDIO_DRAW_LIMIT) {L_audio_value = AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 215 else if (L_audio_value < -AUDIO_DRAW_LIMIT) {L_audio_value = -AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 216
bmazzeo 7:e1dfd64eba81 217 if (R_audio_value > AUDIO_DRAW_LIMIT) {R_audio_value = AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 218 else if (R_audio_value < -AUDIO_DRAW_LIMIT) {R_audio_value = -AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 219
bmazzeo 17:eb85a2387dd4 220 BSP_LCD_DrawPixel(Xpos + i, (uint16_t) ((int16_t) Ypos + L_audio_value), LCD_COLOR_BLUE);
bmazzeo 17:eb85a2387dd4 221 BSP_LCD_DrawPixel(Xpos + i, (uint16_t) ((int16_t) Ypos + R_audio_value), LCD_COLOR_GREEN);
bmazzeo 6:e689075b04ed 222 }
bmazzeo 6:e689075b04ed 223
bmazzeo 6:e689075b04ed 224 }
bmazzeo 14:18f159d48340 225
bmazzeo 14:18f159d48340 226 /**
bmazzeo 14:18f159d48340 227 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 228 * @param buffer_in: Pointer to Audio buffer start location
bmazzeo 14:18f159d48340 229 * @param L_out: Pointer to Left channel out data (float)
bmazzeo 14:18f159d48340 230 * @param R_out: Pointer to Right channel out data (float)
bmazzeo 14:18f159d48340 231 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 232 * @retval None
bmazzeo 14:18f159d48340 233 */
bmazzeo 16:b7dca59ab076 234 void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length)
bmazzeo 14:18f159d48340 235 {
bmazzeo 14:18f159d48340 236 uint16_t i;
bmazzeo 14:18f159d48340 237 uint32_t data_value;
bmazzeo 16:b7dca59ab076 238 uint16_t* audio_mem_address;
bmazzeo 16:b7dca59ab076 239 uint16_t* L_chan_mem_address;
bmazzeo 16:b7dca59ab076 240 uint16_t* R_chan_mem_address;
bmazzeo 14:18f159d48340 241 float L_audio_value;
bmazzeo 14:18f159d48340 242 float R_audio_value;
bmazzeo 6:e689075b04ed 243
bmazzeo 14:18f159d48340 244 for (i=0; i<Length; i++)
bmazzeo 14:18f159d48340 245 {
bmazzeo 16:b7dca59ab076 246 audio_mem_address = (uint16_t*) buffer_in + i;
bmazzeo 16:b7dca59ab076 247 L_chan_mem_address = (uint16_t*) L_out + i;
bmazzeo 16:b7dca59ab076 248 R_chan_mem_address = (uint16_t*) R_out + i;
bmazzeo 16:b7dca59ab076 249 data_value = *((uint16_t*) audio_mem_address);
bmazzeo 14:18f159d48340 250 L_audio_value = (float) ((int16_t) ((data_value >> 16) & 0xFFFF));
bmazzeo 14:18f159d48340 251 R_audio_value = (float) ((int16_t) (data_value & 0xFFFF));
bmazzeo 14:18f159d48340 252
bmazzeo 16:b7dca59ab076 253 *L_chan_mem_address = L_audio_value;
bmazzeo 14:18f159d48340 254 *R_chan_mem_address = R_audio_value;
bmazzeo 14:18f159d48340 255 }
bmazzeo 14:18f159d48340 256 }
bmazzeo 14:18f159d48340 257
bmazzeo 14:18f159d48340 258 /**
bmazzeo 14:18f159d48340 259 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 260 * @param L_out: Pointer to Left channel in data (float)
bmazzeo 14:18f159d48340 261 * @param R_out: Pointer to Right channel in data (float)
bmazzeo 14:18f159d48340 262 * @param buffer_out: Pointer to combined 32 bit (two 16-bit int samples)
bmazzeo 14:18f159d48340 263 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 264 * @retval None
bmazzeo 14:18f159d48340 265 */
bmazzeo 16:b7dca59ab076 266 void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length)
bmazzeo 14:18f159d48340 267 {
bmazzeo 14:18f159d48340 268 uint16_t i;
bmazzeo 14:18f159d48340 269 uint32_t data_value;
bmazzeo 14:18f159d48340 270 uint16_t* audio_mem_address;
bmazzeo 14:18f159d48340 271 uint16_t* L_chan_mem_address;
bmazzeo 14:18f159d48340 272 uint16_t* R_chan_mem_address;
bmazzeo 14:18f159d48340 273 float L_audio_value;
bmazzeo 14:18f159d48340 274 float R_audio_value;
bmazzeo 14:18f159d48340 275
bmazzeo 14:18f159d48340 276 for (i=0; i<Length; i++)
bmazzeo 14:18f159d48340 277 {
bmazzeo 14:18f159d48340 278 L_chan_mem_address = (uint16_t*) L_in + i;
bmazzeo 14:18f159d48340 279 R_chan_mem_address = (uint16_t*) R_in + i;
bmazzeo 14:18f159d48340 280 audio_mem_address = (uint16_t*) buffer_out + i;
bmazzeo 14:18f159d48340 281
bmazzeo 14:18f159d48340 282 L_audio_value = *((uint16_t*) L_chan_mem_address);
bmazzeo 14:18f159d48340 283 R_audio_value = *((uint16_t*) R_chan_mem_address);
bmazzeo 14:18f159d48340 284
bmazzeo 14:18f159d48340 285 data_value = (((uint32_t) ((int16_t) L_audio_value)) << 16) | ((uint32_t) ((int16_t) R_audio_value));
bmazzeo 14:18f159d48340 286 *audio_mem_address = data_value;
bmazzeo 14:18f159d48340 287 }
bmazzeo 14:18f159d48340 288 }
bmazzeo 14:18f159d48340 289
bmazzeo 14:18f159d48340 290
bmazzeo 14:18f159d48340 291
bmazzeo 6:e689075b04ed 292
bmazzeo 6:e689075b04ed 293
adustm 0:da04816fb411 294 /*-------------------------------------------------------------------------------------
adustm 0:da04816fb411 295 Callbacks implementation:
adustm 0:da04816fb411 296 the callbacks API are defined __weak in the stm32746g_discovery_audio.c file
adustm 0:da04816fb411 297 and their implementation should be done in the user code if they are needed.
adustm 0:da04816fb411 298 Below some examples of callback implementations.
adustm 0:da04816fb411 299 -------------------------------------------------------------------------------------*/
adustm 0:da04816fb411 300 /**
adustm 0:da04816fb411 301 * @brief Manages the DMA Transfer complete interrupt.
adustm 0:da04816fb411 302 * @param None
adustm 0:da04816fb411 303 * @retval None
adustm 0:da04816fb411 304 */
adustm 0:da04816fb411 305 void BSP_AUDIO_IN_TransferComplete_CallBack(void)
adustm 0:da04816fb411 306 {
Jerome Coutant 5:66c230f74325 307 audio_rec_buffer_state = BUFFER_OFFSET_FULL;
adustm 0:da04816fb411 308 }
adustm 0:da04816fb411 309
adustm 0:da04816fb411 310 /**
adustm 0:da04816fb411 311 * @brief Manages the DMA Half Transfer complete interrupt.
adustm 0:da04816fb411 312 * @param None
adustm 0:da04816fb411 313 * @retval None
adustm 0:da04816fb411 314 */
adustm 0:da04816fb411 315 void BSP_AUDIO_IN_HalfTransfer_CallBack(void)
adustm 0:da04816fb411 316 {
Jerome Coutant 5:66c230f74325 317 audio_rec_buffer_state = BUFFER_OFFSET_HALF;
adustm 0:da04816fb411 318 }
adustm 0:da04816fb411 319
Jerome Coutant 5:66c230f74325 320 /**
Jerome Coutant 5:66c230f74325 321 * @brief Audio IN Error callback function.
Jerome Coutant 5:66c230f74325 322 * @param None
Jerome Coutant 5:66c230f74325 323 * @retval None
Jerome Coutant 5:66c230f74325 324 */
Jerome Coutant 5:66c230f74325 325 void BSP_AUDIO_IN_Error_CallBack(void)
adustm 0:da04816fb411 326 {
Jerome Coutant 5:66c230f74325 327 printf("BSP_AUDIO_IN_Error_CallBack\n");
adustm 0:da04816fb411 328 }