R&J / Mbed OS 487_Laboratory_1

lab 1 code

Dependencies:   CMSIS-DSP_for_STM32F746G BSP_DISCO_F746NG

main.cpp@16:b7dca59ab076, 2019-12-31 (annotated)

Committer:
bmazzeo
Date:
Tue Dec 31 17:27:20 2019 +0000
Revision:
16:b7dca59ab076
Parent:
15:83e40ccc1b1f
Child:
17:eb85a2387dd4
Working version with traces working - and now correct data types defined.

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
adustm 0:da04816fb411 28
bmazzeo 14:18f159d48340 29 #define HALF_AUDIO_BLOCK_SIZE ((uint32_t)128) // Number of samples (L and R) @ Frequency
bmazzeo 12:e44766b61346 30 #define AUDIO_BLOCK_SIZE ((uint32_t)256)
bmazzeo 6:e689075b04ed 31
bmazzeo 9:f5b37c71856d 32 #define SDRAM_DEVICE_ADDR_AUDIO_MEM ((uint32_t)0xC0400000)
bmazzeo 9:f5b37c71856d 33 #define AUDIO_BUFFER_IN SDRAM_DEVICE_ADDR_AUDIO_MEM
bmazzeo 9:f5b37c71856d 34 #define AUDIO_BUFFER_OUT (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE * 2))
Jerome Coutant 5:66c230f74325 35
bmazzeo 8:d1c41eca57f0 36 #define OSC_START_X_POS 20
bmazzeo 6:e689075b04ed 37 #define OSC_LINE_SIZE 256
bmazzeo 6:e689075b04ed 38 #define L_CHANNEL_Y_POS 120
bmazzeo 6:e689075b04ed 39 #define R_CHANNEL_Y_POS 220
bmazzeo 7:e1dfd64eba81 40 #define AUDIO_DRAW_LIMIT 30
bmazzeo 6:e689075b04ed 41
bmazzeo 9:f5b37c71856d 42 Timer timer;
bmazzeo 9:f5b37c71856d 43
Jerome Coutant 5:66c230f74325 44 volatile uint32_t audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 7:e1dfd64eba81 45 static void Erase_Trace(uint16_t Xpos, uint16_t L_Ypos, uint16_t R_Ypos, uint16_t Length);
bmazzeo 8:d1c41eca57f0 46 static void Draw_Trace(uint16_t Xpos, uint16_t L_Ypos, uint16_t R_Ypos, uint16_t* Mem_start, uint16_t Length);
bmazzeo 16:b7dca59ab076 47 static void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length);
bmazzeo 16:b7dca59ab076 48 static void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length);
Jerome Coutant 5:66c230f74325 49
bmazzeo 14:18f159d48340 50 /* To do converstion to float */
bmazzeo 14:18f159d48340 51 float L_channel_float[HALF_AUDIO_BLOCK_SIZE];
bmazzeo 14:18f159d48340 52 float R_channel_float[HALF_AUDIO_BLOCK_SIZE];
bmazzeo 14:18f159d48340 53
bmazzeo 14:18f159d48340 54 /* Back conversion to integer */
bmazzeo 16:b7dca59ab076 55 uint16_t Processed_audio[HALF_AUDIO_BLOCK_SIZE];
bmazzeo 14:18f159d48340 56
bmazzeo 14:18f159d48340 57 /* Useful variables during looping */
bmazzeo 9:f5b37c71856d 58 uint32_t counter = 0;
bmazzeo 10:a82b64ea1d11 59 char buf[40];
bmazzeo 13:61131aac4031 60 int first_half_time = 0;
bmazzeo 13:61131aac4031 61 int second_half_time = 0;
bmazzeo 13:61131aac4031 62 int total_time = 0;
bmazzeo 9:f5b37c71856d 63
adustm 0:da04816fb411 64 int main()
adustm 0:da04816fb411 65 {
bmazzeo 13:61131aac4031 66 /* Initialize the LCD Screen and display information */
bmazzeo 6:e689075b04ed 67 BSP_LCD_Init();
bmazzeo 6:e689075b04ed 68 BSP_LCD_LayerDefaultInit(LTDC_ACTIVE_LAYER, LCD_FB_START_ADDRESS);
bmazzeo 6:e689075b04ed 69 BSP_LCD_SelectLayer(LTDC_ACTIVE_LAYER);
bmazzeo 6:e689075b04ed 70
bmazzeo 6:e689075b04ed 71 BSP_LCD_Clear(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 72 BSP_LCD_SetFont(&LCD_DEFAULT_FONT);
bmazzeo 6:e689075b04ed 73
bmazzeo 6:e689075b04ed 74 BSP_LCD_SetBackColor(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 75 BSP_LCD_SetTextColor(LCD_COLOR_ORANGE);
bmazzeo 7:e1dfd64eba81 76 BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"487 Mic Audio Test Code", LEFT_MODE);
bmazzeo 8:d1c41eca57f0 77 BSP_LCD_DisplayStringAt(0, L_CHANNEL_Y_POS, (uint8_t *)"L", LEFT_MODE);
bmazzeo 8:d1c41eca57f0 78 BSP_LCD_DisplayStringAt(0, R_CHANNEL_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 12:e44766b61346 111 Erase_Trace(OSC_START_X_POS, L_CHANNEL_Y_POS, R_CHANNEL_Y_POS, HALF_AUDIO_BLOCK_SIZE);
bmazzeo 12:e44766b61346 112 Draw_Trace(OSC_START_X_POS, L_CHANNEL_Y_POS, R_CHANNEL_Y_POS, (uint16_t *) AUDIO_BUFFER_IN, HALF_AUDIO_BLOCK_SIZE);
bmazzeo 9:f5b37c71856d 113
bmazzeo 14:18f159d48340 114 /* Convert data to floating point representation for processing */
bmazzeo 16:b7dca59ab076 115 Audio_to_Float((uint16_t *) AUDIO_BUFFER_IN, (float *) L_channel_float, (float *) R_channel_float, HALF_AUDIO_BLOCK_SIZE);
bmazzeo 16:b7dca59ab076 116 Float_to_Audio((float *) L_channel_float, (float *) R_channel_float, (uint16_t *) Processed_audio, HALF_AUDIO_BLOCK_SIZE);
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 12:e44766b61346 130 Erase_Trace(OSC_START_X_POS+HALF_AUDIO_BLOCK_SIZE, L_CHANNEL_Y_POS, R_CHANNEL_Y_POS, HALF_AUDIO_BLOCK_SIZE);
bmazzeo 12:e44766b61346 131 Draw_Trace(OSC_START_X_POS+HALF_AUDIO_BLOCK_SIZE, L_CHANNEL_Y_POS, R_CHANNEL_Y_POS, (uint16_t *) AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE), HALF_AUDIO_BLOCK_SIZE);
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 13:61131aac4031 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 7:e1dfd64eba81 163 void Erase_Trace(uint16_t Xpos, uint16_t L_Ypos, uint16_t R_Ypos, uint16_t Length)
bmazzeo 7:e1dfd64eba81 164 {
bmazzeo 7:e1dfd64eba81 165 BSP_LCD_SetTextColor(LCD_COLOR_BROWN);
bmazzeo 7:e1dfd64eba81 166 BSP_LCD_FillRect(Xpos, L_Ypos - AUDIO_DRAW_LIMIT, Length, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 167 BSP_LCD_FillRect(Xpos, L_Ypos+1, Length, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 168 BSP_LCD_FillRect(Xpos, R_Ypos - AUDIO_DRAW_LIMIT, Length, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 169 BSP_LCD_FillRect(Xpos, R_Ypos+1, Length, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 170
bmazzeo 7:e1dfd64eba81 171 BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
bmazzeo 8:d1c41eca57f0 172 BSP_LCD_DrawHLine(Xpos, L_CHANNEL_Y_POS, Length);
bmazzeo 8:d1c41eca57f0 173 BSP_LCD_DrawHLine(Xpos, R_CHANNEL_Y_POS, Length);
bmazzeo 7:e1dfd64eba81 174
bmazzeo 7:e1dfd64eba81 175 }
bmazzeo 7:e1dfd64eba81 176
Jerome Coutant 5:66c230f74325 177
bmazzeo 6:e689075b04ed 178 /**
bmazzeo 6:e689075b04ed 179 * @brief Draws a trace of the data line.
bmazzeo 6:e689075b04ed 180 * @param Xpos: X position
bmazzeo 7:e1dfd64eba81 181 * @param L_Ypos: Left channel Y position
bmazzeo 7:e1dfd64eba81 182 * @param R_Ypos: Right channel Y position
bmazzeo 6:e689075b04ed 183 * @param Mem_start: Start of memory location
bmazzeo 6:e689075b04ed 184 * @param Length: length of trace
bmazzeo 6:e689075b04ed 185 * @retval None
bmazzeo 6:e689075b04ed 186 */
bmazzeo 8:d1c41eca57f0 187 void Draw_Trace(uint16_t Xpos, uint16_t L_Ypos, uint16_t R_Ypos, uint16_t* Mem_start, uint16_t Length)
bmazzeo 6:e689075b04ed 188 {
bmazzeo 7:e1dfd64eba81 189 uint16_t i;
bmazzeo 7:e1dfd64eba81 190 uint32_t data_value;
bmazzeo 7:e1dfd64eba81 191 uint32_t* mem_address;
bmazzeo 7:e1dfd64eba81 192 char buf[10];
bmazzeo 7:e1dfd64eba81 193 int16_t L_audio_value;
bmazzeo 7:e1dfd64eba81 194 int16_t R_audio_value;
bmazzeo 6:e689075b04ed 195
bmazzeo 16:b7dca59ab076 196 //data_value = *((uint32_t*) Mem_start);
bmazzeo 16:b7dca59ab076 197 //L_audio_value = (int16_t) ((data_value >> 16) & 0xFFFF);
bmazzeo 16:b7dca59ab076 198 //R_audio_value = (int16_t) (data_value & 0xFFFF);
bmazzeo 7:e1dfd64eba81 199
bmazzeo 8:d1c41eca57f0 200 for (i=0; i<Length; i++)
bmazzeo 6:e689075b04ed 201 {
bmazzeo 7:e1dfd64eba81 202 mem_address = (uint32_t*) Mem_start + i;
bmazzeo 7:e1dfd64eba81 203 data_value = *((uint32_t*) mem_address);
bmazzeo 7:e1dfd64eba81 204 L_audio_value = (int16_t) ((data_value >> 16) & 0xFFFF);
bmazzeo 7:e1dfd64eba81 205 R_audio_value = (int16_t) (data_value & 0xFFFF);
bmazzeo 7:e1dfd64eba81 206
bmazzeo 7:e1dfd64eba81 207 L_audio_value = L_audio_value / 50;
bmazzeo 7:e1dfd64eba81 208 R_audio_value = R_audio_value / 50;
bmazzeo 7:e1dfd64eba81 209
bmazzeo 7:e1dfd64eba81 210 if (L_audio_value > AUDIO_DRAW_LIMIT) {L_audio_value = AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 211 else if (L_audio_value < -AUDIO_DRAW_LIMIT) {L_audio_value = -AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 212
bmazzeo 7:e1dfd64eba81 213 if (R_audio_value > AUDIO_DRAW_LIMIT) {R_audio_value = AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 214 else if (R_audio_value < -AUDIO_DRAW_LIMIT) {R_audio_value = -AUDIO_DRAW_LIMIT;}
bmazzeo 7:e1dfd64eba81 215
bmazzeo 7:e1dfd64eba81 216 BSP_LCD_DrawPixel(Xpos + i, (uint16_t) ((int16_t) L_Ypos + L_audio_value), LCD_COLOR_WHITE);
bmazzeo 7:e1dfd64eba81 217 BSP_LCD_DrawPixel(Xpos + i, (uint16_t) ((int16_t) R_Ypos + R_audio_value), LCD_COLOR_WHITE);
bmazzeo 6:e689075b04ed 218 }
bmazzeo 6:e689075b04ed 219
bmazzeo 6:e689075b04ed 220 }
bmazzeo 14:18f159d48340 221
bmazzeo 14:18f159d48340 222 /**
bmazzeo 14:18f159d48340 223 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 224 * @param buffer_in: Pointer to Audio buffer start location
bmazzeo 14:18f159d48340 225 * @param L_out: Pointer to Left channel out data (float)
bmazzeo 14:18f159d48340 226 * @param R_out: Pointer to Right channel out data (float)
bmazzeo 14:18f159d48340 227 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 228 * @retval None
bmazzeo 14:18f159d48340 229 */
bmazzeo 16:b7dca59ab076 230 void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length)
bmazzeo 14:18f159d48340 231 {
bmazzeo 14:18f159d48340 232 uint16_t i;
bmazzeo 14:18f159d48340 233 uint32_t data_value;
bmazzeo 16:b7dca59ab076 234 uint16_t* audio_mem_address;
bmazzeo 16:b7dca59ab076 235 uint16_t* L_chan_mem_address;
bmazzeo 16:b7dca59ab076 236 uint16_t* R_chan_mem_address;
bmazzeo 14:18f159d48340 237 float L_audio_value;
bmazzeo 14:18f159d48340 238 float R_audio_value;
bmazzeo 6:e689075b04ed 239
bmazzeo 14:18f159d48340 240 for (i=0; i<Length; i++)
bmazzeo 14:18f159d48340 241 {
bmazzeo 16:b7dca59ab076 242 audio_mem_address = (uint16_t*) buffer_in + i;
bmazzeo 16:b7dca59ab076 243 L_chan_mem_address = (uint16_t*) L_out + i;
bmazzeo 16:b7dca59ab076 244 R_chan_mem_address = (uint16_t*) R_out + i;
bmazzeo 16:b7dca59ab076 245 data_value = *((uint16_t*) audio_mem_address);
bmazzeo 14:18f159d48340 246 L_audio_value = (float) ((int16_t) ((data_value >> 16) & 0xFFFF));
bmazzeo 14:18f159d48340 247 R_audio_value = (float) ((int16_t) (data_value & 0xFFFF));
bmazzeo 14:18f159d48340 248
bmazzeo 16:b7dca59ab076 249 *L_chan_mem_address = L_audio_value;
bmazzeo 14:18f159d48340 250 *R_chan_mem_address = R_audio_value;
bmazzeo 14:18f159d48340 251 }
bmazzeo 14:18f159d48340 252 }
bmazzeo 14:18f159d48340 253
bmazzeo 14:18f159d48340 254 /**
bmazzeo 14:18f159d48340 255 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 256 * @param L_out: Pointer to Left channel in data (float)
bmazzeo 14:18f159d48340 257 * @param R_out: Pointer to Right channel in data (float)
bmazzeo 14:18f159d48340 258 * @param buffer_out: Pointer to combined 32 bit (two 16-bit int samples)
bmazzeo 14:18f159d48340 259 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 260 * @retval None
bmazzeo 14:18f159d48340 261 */
bmazzeo 16:b7dca59ab076 262 void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length)
bmazzeo 14:18f159d48340 263 {
bmazzeo 14:18f159d48340 264 uint16_t i;
bmazzeo 14:18f159d48340 265 uint32_t data_value;
bmazzeo 14:18f159d48340 266 uint16_t* audio_mem_address;
bmazzeo 14:18f159d48340 267 uint16_t* L_chan_mem_address;
bmazzeo 14:18f159d48340 268 uint16_t* R_chan_mem_address;
bmazzeo 14:18f159d48340 269 float L_audio_value;
bmazzeo 14:18f159d48340 270 float R_audio_value;
bmazzeo 14:18f159d48340 271
bmazzeo 14:18f159d48340 272 for (i=0; i<Length; i++)
bmazzeo 14:18f159d48340 273 {
bmazzeo 14:18f159d48340 274 L_chan_mem_address = (uint16_t*) L_in + i;
bmazzeo 14:18f159d48340 275 R_chan_mem_address = (uint16_t*) R_in + i;
bmazzeo 14:18f159d48340 276 audio_mem_address = (uint16_t*) buffer_out + i;
bmazzeo 14:18f159d48340 277
bmazzeo 14:18f159d48340 278 L_audio_value = *((uint16_t*) L_chan_mem_address);
bmazzeo 14:18f159d48340 279 R_audio_value = *((uint16_t*) R_chan_mem_address);
bmazzeo 14:18f159d48340 280
bmazzeo 14:18f159d48340 281 data_value = (((uint32_t) ((int16_t) L_audio_value)) << 16) | ((uint32_t) ((int16_t) R_audio_value));
bmazzeo 14:18f159d48340 282 *audio_mem_address = data_value;
bmazzeo 14:18f159d48340 283 }
bmazzeo 14:18f159d48340 284 }
bmazzeo 14:18f159d48340 285
bmazzeo 14:18f159d48340 286
bmazzeo 14:18f159d48340 287
bmazzeo 6:e689075b04ed 288
bmazzeo 6:e689075b04ed 289
adustm 0:da04816fb411 290 /*-------------------------------------------------------------------------------------
adustm 0:da04816fb411 291 Callbacks implementation:
adustm 0:da04816fb411 292 the callbacks API are defined __weak in the stm32746g_discovery_audio.c file
adustm 0:da04816fb411 293 and their implementation should be done in the user code if they are needed.
adustm 0:da04816fb411 294 Below some examples of callback implementations.
adustm 0:da04816fb411 295 -------------------------------------------------------------------------------------*/
adustm 0:da04816fb411 296 /**
adustm 0:da04816fb411 297 * @brief Manages the DMA Transfer complete interrupt.
adustm 0:da04816fb411 298 * @param None
adustm 0:da04816fb411 299 * @retval None
adustm 0:da04816fb411 300 */
adustm 0:da04816fb411 301 void BSP_AUDIO_IN_TransferComplete_CallBack(void)
adustm 0:da04816fb411 302 {
Jerome Coutant 5:66c230f74325 303 audio_rec_buffer_state = BUFFER_OFFSET_FULL;
adustm 0:da04816fb411 304 }
adustm 0:da04816fb411 305
adustm 0:da04816fb411 306 /**
adustm 0:da04816fb411 307 * @brief Manages the DMA Half 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_HalfTransfer_CallBack(void)
adustm 0:da04816fb411 312 {
Jerome Coutant 5:66c230f74325 313 audio_rec_buffer_state = BUFFER_OFFSET_HALF;
adustm 0:da04816fb411 314 }
adustm 0:da04816fb411 315
Jerome Coutant 5:66c230f74325 316 /**
Jerome Coutant 5:66c230f74325 317 * @brief Audio IN Error callback function.
Jerome Coutant 5:66c230f74325 318 * @param None
Jerome Coutant 5:66c230f74325 319 * @retval None
Jerome Coutant 5:66c230f74325 320 */
Jerome Coutant 5:66c230f74325 321 void BSP_AUDIO_IN_Error_CallBack(void)
adustm 0:da04816fb411 322 {
Jerome Coutant 5:66c230f74325 323 printf("BSP_AUDIO_IN_Error_CallBack\n");
adustm 0:da04816fb411 324 }