R&J / Mbed OS 487_Laboratory_1

lab 1 code

Dependencies:   CMSIS-DSP_for_STM32F746G BSP_DISCO_F746NG

main.cpp@34:5bf89ab5e247, 2020-01-28 (annotated)

Committer:
justenmg
Date:
Tue Jan 28 22:23:00 2020 +0000
Revision:
34:5bf89ab5e247
Parent:
33:a0dab92ea1b9 
Initial commit

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
justenmg 34:5bf89ab5e247 35 /* Scale factor */
justenmg 34:5bf89ab5e247 36 #define SCALE_FACTOR ((uint16_t)100) // Scale factor for dividing R L
justenmg 34:5bf89ab5e247 37
bmazzeo 30:debea332cdfe 38 /* These audio block samples define the size of the buffering */
justenmg 34:5bf89ab5e247 39 #define AUDIO_SAMPLE_LENGTH ((uint16_t)16) // Bits per sample
bmazzeo 19:479f611941a8 40 #define AUDIO_BLOCK_SAMPLES ((uint32_t)128) // Number of samples (L and R) in audio block (each samples is 16 bits)
bmazzeo 19:479f611941a8 41 #define AUDIO_BLOCK_SIZE ((uint32_t)512) // Number of bytes in audio block (4 * AUDIO_BLOCK_SAMPLES)
bmazzeo 6:e689075b04ed 42
bmazzeo 30:debea332cdfe 43 /* These RAM addresses are important to determine where the audio data is stored. */
bmazzeo 9:f5b37c71856d 44 #define SDRAM_DEVICE_ADDR_AUDIO_MEM ((uint32_t)0xC0400000)
bmazzeo 9:f5b37c71856d 45 #define AUDIO_BUFFER_IN SDRAM_DEVICE_ADDR_AUDIO_MEM
bmazzeo 9:f5b37c71856d 46 #define AUDIO_BUFFER_OUT (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE * 2))
Jerome Coutant 5:66c230f74325 47
bmazzeo 30:debea332cdfe 48 /* These definitions define the size of the oscilloscope that is used to display data. */
bmazzeo 8:d1c41eca57f0 49 #define OSC_START_X_POS 20
bmazzeo 6:e689075b04ed 50 #define OSC_LINE_SIZE 256
justenmg 34:5bf89ab5e247 51 #define OSC_Y_POS 150
bmazzeo 31:5a0235b66851 52 #define AUDIO_DRAW_LIMIT 50
bmazzeo 6:e689075b04ed 53
bmazzeo 30:debea332cdfe 54 /* This define a timer that is then used to record the timing of the different processing stages. */
bmazzeo 9:f5b37c71856d 55 Timer timer;
bmazzeo 9:f5b37c71856d 56
bmazzeo 30:debea332cdfe 57 /* This variable is important because it define the audio buffer recording state. */
Jerome Coutant 5:66c230f74325 58 volatile uint32_t audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 30:debea332cdfe 59
bmazzeo 30:debea332cdfe 60 /* Function declarations */
bmazzeo 17:eb85a2387dd4 61 static void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length);
bmazzeo 17:eb85a2387dd4 62 static void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length);
bmazzeo 16:b7dca59ab076 63 static void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length);
bmazzeo 16:b7dca59ab076 64 static void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length);
Jerome Coutant 5:66c230f74325 65
bmazzeo 30:debea332cdfe 66 /* These memory blocks are important for converting to floating point representation. */
bmazzeo 19:479f611941a8 67 float L_channel_float[AUDIO_BLOCK_SAMPLES];
bmazzeo 19:479f611941a8 68 float R_channel_float[AUDIO_BLOCK_SAMPLES];
bmazzeo 20:2ecdf687a2d1 69 float *L_channel_float_p = &L_channel_float[0];
bmazzeo 20:2ecdf687a2d1 70 float *R_channel_float_p = &R_channel_float[0];
bmazzeo 14:18f159d48340 71
bmazzeo 30:debea332cdfe 72 /* These memory blocks are where the information is stored to send back out to the WM8994 chip. */
bmazzeo 22:f36d7a53bb7e 73 uint16_t Processed_audio[AUDIO_BLOCK_SAMPLES];
bmazzeo 20:2ecdf687a2d1 74 uint16_t *Processed_audio_p = &Processed_audio[0];
bmazzeo 14:18f159d48340 75
bmazzeo 14:18f159d48340 76 /* Useful variables during looping */
bmazzeo 30:debea332cdfe 77 uint32_t counter = 0; // Loop counter
bmazzeo 30:debea332cdfe 78 char buf[40]; // Character buffer for sprintf statements to the LCD
bmazzeo 30:debea332cdfe 79 int first_half_time = 0; // Time of first processing block
bmazzeo 30:debea332cdfe 80 int second_half_time = 0; // Time of second processing block
bmazzeo 30:debea332cdfe 81 int total_time = 0; // Time of total loop (first and second blocks)
bmazzeo 9:f5b37c71856d 82
bmazzeo 30:debea332cdfe 83 /* Main Function */
adustm 0:da04816fb411 84 int main()
adustm 0:da04816fb411 85 {
bmazzeo 13:61131aac4031 86 /* Initialize the LCD Screen and display information */
bmazzeo 6:e689075b04ed 87 BSP_LCD_Init();
bmazzeo 6:e689075b04ed 88 BSP_LCD_LayerDefaultInit(LTDC_ACTIVE_LAYER, LCD_FB_START_ADDRESS);
bmazzeo 6:e689075b04ed 89 BSP_LCD_SelectLayer(LTDC_ACTIVE_LAYER);
bmazzeo 6:e689075b04ed 90
bmazzeo 30:debea332cdfe 91 /* Clear the LCD and set the font to be default */
bmazzeo 6:e689075b04ed 92 BSP_LCD_Clear(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 93 BSP_LCD_SetFont(&LCD_DEFAULT_FONT);
bmazzeo 30:debea332cdfe 94
bmazzeo 30:debea332cdfe 95 /* Set the backcolor to be black and the textcolor to be orange. */
bmazzeo 6:e689075b04ed 96 BSP_LCD_SetBackColor(LCD_COLOR_BLACK);
bmazzeo 6:e689075b04ed 97 BSP_LCD_SetTextColor(LCD_COLOR_ORANGE);
bmazzeo 30:debea332cdfe 98
bmazzeo 30:debea332cdfe 99 /* The following are static display elements that will remain on the screen. */
bmazzeo 31:5a0235b66851 100 BSP_LCD_DisplayStringAt(0, 0, (uint8_t *)"487 Lab 1 (student)", LEFT_MODE);
bmazzeo 30:debea332cdfe 101
bmazzeo 30:debea332cdfe 102 /* Display the L and R colors for the channels */
bmazzeo 17:eb85a2387dd4 103 BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
bmazzeo 17:eb85a2387dd4 104 BSP_LCD_DisplayStringAt(0, OSC_Y_POS - 20, (uint8_t *)"L", LEFT_MODE);
bmazzeo 17:eb85a2387dd4 105 BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
bmazzeo 17:eb85a2387dd4 106 BSP_LCD_DisplayStringAt(0, OSC_Y_POS, (uint8_t *)"R", LEFT_MODE);
justenmg 34:5bf89ab5e247 107
justenmg 34:5bf89ab5e247 108 // Draw rectangle and center line for O-scope background
justenmg 34:5bf89ab5e247 109 BSP_LCD_SetTextColor(LCD_COLOR_YELLOW);
justenmg 34:5bf89ab5e247 110 BSP_LCD_DrawRect(OSC_START_X_POS - 1, OSC_Y_POS - AUDIO_DRAW_LIMIT - 1, OSC_LINE_SIZE + 2, AUDIO_DRAW_LIMIT*2 + 2);
justenmg 34:5bf89ab5e247 111 BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
justenmg 34:5bf89ab5e247 112 BSP_LCD_DrawLine(OSC_START_X_POS, OSC_Y_POS, OSC_START_X_POS + OSC_LINE_SIZE, OSC_Y_POS);
justenmg 34:5bf89ab5e247 113
bmazzeo 6:e689075b04ed 114
bmazzeo 30:debea332cdfe 115 /* The following code should not be code that you need to worry about - it sets up the audio interfaces. */
bmazzeo 30:debea332cdfe 116 /* Initialize the Audio Interface */
bmazzeo 30:debea332cdfe 117 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 118
bmazzeo 30:debea332cdfe 119 /* Initialize SDRAM buffers */
bmazzeo 30:debea332cdfe 120 BSP_SDRAM_Init();
bmazzeo 30:debea332cdfe 121 memset((uint16_t *)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE * 2);
bmazzeo 30:debea332cdfe 122 memset((uint16_t *)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE * 2);
bmazzeo 30:debea332cdfe 123
bmazzeo 30:debea332cdfe 124 /* Start Recording */
bmazzeo 30:debea332cdfe 125 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 126
bmazzeo 30:debea332cdfe 127 /* Start Playback */
bmazzeo 30:debea332cdfe 128 BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02);
bmazzeo 30:debea332cdfe 129 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 130
bmazzeo 30:debea332cdfe 131 /* The audio interfaces are all now working.
bmazzeo 30:debea332cdfe 132 * Importantly - AUDIO_BUFFER_IN is the pointer to the incoming data from the WM8994
bmazzeo 30:debea332cdfe 133 * AUDIO_BUFFER_OUT is the pointer to the outgoing data to the WM8994 */
Jerome Coutant 5:66c230f74325 134
adustm 0:da04816fb411 135
bmazzeo 30:debea332cdfe 136 /* Initialize signal processing filters - usually there are variables that
bmazzeo 30:debea332cdfe 137 * need to be set up or that there are arrays you need to precompute - this
bmazzeo 30:debea332cdfe 138 * function call allows you to do that. */
bmazzeo 25:5412779376a7 139 initalize_signal_processing();
adustm 0:da04816fb411 140
bmazzeo 30:debea332cdfe 141 /* Hardware timer starts. Set to zero */
bmazzeo 9:f5b37c71856d 142 timer.start();
bmazzeo 30:debea332cdfe 143
bmazzeo 30:debea332cdfe 144 /* Main signal processing while loop */
adustm 0:da04816fb411 145 while (1) {
bmazzeo 30:debea332cdfe 146
bmazzeo 6:e689075b04ed 147 /* First Half */
bmazzeo 30:debea332cdfe 148 /* Wait until end of half block recording before going on in the first half cycle*/
bmazzeo 11:4256dbbb0c89 149 while (audio_rec_buffer_state != BUFFER_OFFSET_HALF) {}
bmazzeo 9:f5b37c71856d 150
bmazzeo 13:61131aac4031 151 /* This captures the time of an entire cycle */
bmazzeo 9:f5b37c71856d 152 total_time = timer.read_us();
bmazzeo 13:61131aac4031 153
bmazzeo 13:61131aac4031 154 /* Reset the timer counter to zero */
bmazzeo 9:f5b37c71856d 155 timer.reset();
Jerome Coutant 5:66c230f74325 156
bmazzeo 13:61131aac4031 157 /* Plot traces of first half block recording */
bmazzeo 19:479f611941a8 158 Erase_Trace(OSC_START_X_POS, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 159 Draw_Trace(OSC_START_X_POS, OSC_Y_POS, (uint16_t *) AUDIO_BUFFER_IN, AUDIO_BLOCK_SAMPLES);
bmazzeo 18:255d15af49f2 160
bmazzeo 14:18f159d48340 161 /* Convert data to floating point representation for processing */
bmazzeo 20:2ecdf687a2d1 162 Audio_to_Float((uint16_t *) AUDIO_BUFFER_IN, L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 163
bmazzeo 30:debea332cdfe 164 /* ------------------------------------------------------------------------ */
bmazzeo 30:debea332cdfe 165 /* Here is where signal processing can be done on the floating point arrays */
bmazzeo 22:f36d7a53bb7e 166
bmazzeo 30:debea332cdfe 167 process_audio_channel_signals(L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 20:2ecdf687a2d1 168
bmazzeo 30:debea332cdfe 169 /* Here is where signal processing can end on the floating point arrays */
bmazzeo 30:debea332cdfe 170 /* -------------------------------------------------------------------- */
bmazzeo 20:2ecdf687a2d1 171
bmazzeo 22:f36d7a53bb7e 172 /* Covert floating point data back to fixed point audio format */
bmazzeo 21:4dbfda694c0d 173 Float_to_Audio(L_channel_float_p, R_channel_float_p, (uint16_t *) Processed_audio, AUDIO_BLOCK_SAMPLES);
bmazzeo 14:18f159d48340 174
bmazzeo 13:61131aac4031 175 /* Copy recorded 1st half block into the audio buffer that goes out */
bmazzeo 31:5a0235b66851 176 /* Replace the second memcpy with this first one once you have worked out the processed audio functions. */
justenmg 34:5bf89ab5e247 177 memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(Processed_audio), AUDIO_BLOCK_SIZE);
justenmg 34:5bf89ab5e247 178 //memcpy((uint16_t *)(AUDIO_BUFFER_OUT), (uint16_t *)(AUDIO_BUFFER_IN), AUDIO_BLOCK_SIZE);
bmazzeo 13:61131aac4031 179
bmazzeo 26:023edf8cea6c 180 /* Display useful cycle information (split up information display so the processing is more balanced) */
bmazzeo 26:023edf8cea6c 181 sprintf(buf, "Cycles: %9d", counter);
bmazzeo 26:023edf8cea6c 182 BSP_LCD_SetTextColor(LCD_COLOR_RED);
bmazzeo 26:023edf8cea6c 183 BSP_LCD_DisplayStringAt(0, 46, (uint8_t *) buf, LEFT_MODE);
bmazzeo 26:023edf8cea6c 184
bmazzeo 26:023edf8cea6c 185
bmazzeo 13:61131aac4031 186 /* Capture the timing of the first half processing */
bmazzeo 9:f5b37c71856d 187 first_half_time = timer.read_us();
bmazzeo 13:61131aac4031 188 /* End First Half */
bmazzeo 8:d1c41eca57f0 189
bmazzeo 6:e689075b04ed 190 /* Second Half */
adustm 0:da04816fb411 191 /* Wait end of one block recording */
bmazzeo 11:4256dbbb0c89 192 while (audio_rec_buffer_state != BUFFER_OFFSET_FULL) {}
bmazzeo 9:f5b37c71856d 193
bmazzeo 13:61131aac4031 194 /* Plot traces of second half block recording */
bmazzeo 19:479f611941a8 195 Erase_Trace(OSC_START_X_POS+AUDIO_BLOCK_SAMPLES, OSC_Y_POS, AUDIO_BLOCK_SAMPLES);
bmazzeo 19:479f611941a8 196 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 197
bmazzeo 22:f36d7a53bb7e 198 /* Convert data to floating point representation for processing */
bmazzeo 22:f36d7a53bb7e 199 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 200
bmazzeo 30:debea332cdfe 201 /* ------------------------------------------------------------------------ */
bmazzeo 30:debea332cdfe 202 /* Here is where signal processing can be done on the floating point arrays */
bmazzeo 22:f36d7a53bb7e 203
bmazzeo 30:debea332cdfe 204 process_audio_channel_signals(L_channel_float_p, R_channel_float_p, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 205
bmazzeo 30:debea332cdfe 206 /* Here is where signal processing can end on the floating point arrays */
bmazzeo 30:debea332cdfe 207 /* -------------------------------------------------------------------- */
bmazzeo 30:debea332cdfe 208
bmazzeo 22:f36d7a53bb7e 209 /* Covert floating point data back to fixed point audio format */
bmazzeo 22:f36d7a53bb7e 210 Float_to_Audio(L_channel_float_p, R_channel_float_p, (uint16_t *) Processed_audio, AUDIO_BLOCK_SAMPLES);
bmazzeo 22:f36d7a53bb7e 211
bmazzeo 22:f36d7a53bb7e 212 /* Copy recorded 2nd half block into the audio buffer that goes out */
justenmg 34:5bf89ab5e247 213 memcpy((uint16_t *)(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t *) (Processed_audio), AUDIO_BLOCK_SIZE);
justenmg 34:5bf89ab5e247 214 //memcpy((uint16_t *)(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t *)(AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SIZE);
bmazzeo 31:5a0235b66851 215
bmazzeo 13:61131aac4031 216
bmazzeo 13:61131aac4031 217 /* Compute important cycle information and display it*/
bmazzeo 26:023edf8cea6c 218 sprintf(buf, "1:%6d 2:%6d T:%6d", first_half_time, second_half_time, total_time);
bmazzeo 6:e689075b04ed 219 BSP_LCD_SetTextColor(LCD_COLOR_RED);
bmazzeo 10:a82b64ea1d11 220 BSP_LCD_DisplayStringAt(0, 20, (uint8_t *) buf, LEFT_MODE);
bmazzeo 13:61131aac4031 221
bmazzeo 13:61131aac4031 222 /* Copy recorded 2nd half block into audio output buffer */
bmazzeo 18:255d15af49f2 223
bmazzeo 13:61131aac4031 224 /* Change the recording buffer state to reflect the status of the buffer */
bmazzeo 13:61131aac4031 225 audio_rec_buffer_state = BUFFER_OFFSET_NONE;
bmazzeo 26:023edf8cea6c 226
bmazzeo 26:023edf8cea6c 227 /* Increase the counter */
bmazzeo 26:023edf8cea6c 228 counter++;
bmazzeo 9:f5b37c71856d 229
bmazzeo 13:61131aac4031 230 /* Measures the amount of time to process the second half */
bmazzeo 9:f5b37c71856d 231 second_half_time = timer.read_us();
bmazzeo 9:f5b37c71856d 232
bmazzeo 13:61131aac4031 233 /* End Second Half */
adustm 0:da04816fb411 234 }
adustm 0:da04816fb411 235 }
Jerome Coutant 5:66c230f74325 236
bmazzeo 7:e1dfd64eba81 237 /**
bmazzeo 7:e1dfd64eba81 238 * @brief Draws a trace of the data line.
bmazzeo 7:e1dfd64eba81 239 * @param Xpos: X position
bmazzeo 33:a0dab92ea1b9 240 * @param Ypos: Y position
bmazzeo 7:e1dfd64eba81 241 * @param Mem_start: Start of memory location
bmazzeo 7:e1dfd64eba81 242 * @param Length: length of trace
bmazzeo 7:e1dfd64eba81 243 * @retval None
bmazzeo 7:e1dfd64eba81 244 */
bmazzeo 17:eb85a2387dd4 245 void Erase_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t Length)
bmazzeo 7:e1dfd64eba81 246 {
justenmg 34:5bf89ab5e247 247 BSP_LCD_SetTextColor(LCD_COLOR_BLACK);
justenmg 34:5bf89ab5e247 248 BSP_LCD_FillRect(Xpos, Ypos - AUDIO_DRAW_LIMIT, OSC_LINE_SIZE/2, AUDIO_DRAW_LIMIT);
justenmg 34:5bf89ab5e247 249 BSP_LCD_FillRect(Xpos, Ypos+1, OSC_LINE_SIZE/2, AUDIO_DRAW_LIMIT);
bmazzeo 7:e1dfd64eba81 250 }
bmazzeo 7:e1dfd64eba81 251
Jerome Coutant 5:66c230f74325 252
bmazzeo 6:e689075b04ed 253 /**
bmazzeo 6:e689075b04ed 254 * @brief Draws a trace of the data line.
bmazzeo 6:e689075b04ed 255 * @param Xpos: X position
bmazzeo 33:a0dab92ea1b9 256 * @param Ypos: Y position
bmazzeo 6:e689075b04ed 257 * @param Mem_start: Start of memory location
bmazzeo 6:e689075b04ed 258 * @param Length: length of trace
bmazzeo 6:e689075b04ed 259 * @retval None
bmazzeo 6:e689075b04ed 260 */
bmazzeo 17:eb85a2387dd4 261 void Draw_Trace(uint16_t Xpos, uint16_t Ypos, uint16_t* Mem_start, uint16_t Length)
bmazzeo 6:e689075b04ed 262 {
justenmg 34:5bf89ab5e247 263 int16_t R;
justenmg 34:5bf89ab5e247 264 int16_t L;
justenmg 34:5bf89ab5e247 265 int16_t R_scaled;
justenmg 34:5bf89ab5e247 266 int16_t L_scaled;
justenmg 34:5bf89ab5e247 267
justenmg 34:5bf89ab5e247 268
justenmg 34:5bf89ab5e247 269 for(uint16_t ii = 0; ii < Length; ii++)
justenmg 34:5bf89ab5e247 270 {
justenmg 34:5bf89ab5e247 271 R = *Mem_start;
justenmg 34:5bf89ab5e247 272 Mem_start++;
justenmg 34:5bf89ab5e247 273 L = *Mem_start;
justenmg 34:5bf89ab5e247 274 Mem_start++;
justenmg 34:5bf89ab5e247 275
justenmg 34:5bf89ab5e247 276 R_scaled = R/SCALE_FACTOR;
justenmg 34:5bf89ab5e247 277 L_scaled = L/SCALE_FACTOR;
justenmg 34:5bf89ab5e247 278 if(L_scaled != 0 && L_scaled < AUDIO_DRAW_LIMIT && L_scaled > -AUDIO_DRAW_LIMIT)
justenmg 34:5bf89ab5e247 279 {
justenmg 34:5bf89ab5e247 280 BSP_LCD_DrawPixel(ii + Xpos, L_scaled + Ypos, LCD_COLOR_BLUE);
justenmg 34:5bf89ab5e247 281 }
justenmg 34:5bf89ab5e247 282
justenmg 34:5bf89ab5e247 283 if(R_scaled != 0 && R_scaled < AUDIO_DRAW_LIMIT && R_scaled > -AUDIO_DRAW_LIMIT)
justenmg 34:5bf89ab5e247 284 {
justenmg 34:5bf89ab5e247 285 BSP_LCD_DrawPixel(ii + Xpos, R_scaled + Ypos, LCD_COLOR_GREEN);
justenmg 34:5bf89ab5e247 286 }
justenmg 34:5bf89ab5e247 287 }
bmazzeo 6:e689075b04ed 288 }
bmazzeo 14:18f159d48340 289
bmazzeo 14:18f159d48340 290 /**
bmazzeo 14:18f159d48340 291 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 292 * @param buffer_in: Pointer to Audio buffer start location
bmazzeo 14:18f159d48340 293 * @param L_out: Pointer to Left channel out data (float)
bmazzeo 14:18f159d48340 294 * @param R_out: Pointer to Right channel out data (float)
bmazzeo 14:18f159d48340 295 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 296 * @retval None
bmazzeo 14:18f159d48340 297 */
bmazzeo 16:b7dca59ab076 298 void Audio_to_Float(uint16_t* buffer_in, float* L_out, float* R_out, uint16_t Length)
justenmg 34:5bf89ab5e247 299 {
justenmg 34:5bf89ab5e247 300 int16_t R;
justenmg 34:5bf89ab5e247 301 int16_t L;
justenmg 34:5bf89ab5e247 302
justenmg 34:5bf89ab5e247 303 for(uint16_t ii = 0; ii < Length; ii++)
justenmg 34:5bf89ab5e247 304 {
justenmg 34:5bf89ab5e247 305 R = *buffer_in;
justenmg 34:5bf89ab5e247 306 buffer_in++;
justenmg 34:5bf89ab5e247 307 L = *buffer_in;
justenmg 34:5bf89ab5e247 308 buffer_in++;
justenmg 34:5bf89ab5e247 309
justenmg 34:5bf89ab5e247 310 *R_out = R;
justenmg 34:5bf89ab5e247 311 R_out++;
justenmg 34:5bf89ab5e247 312 *L_out = L;
justenmg 34:5bf89ab5e247 313 L_out++;
justenmg 34:5bf89ab5e247 314 }
bmazzeo 14:18f159d48340 315 }
bmazzeo 14:18f159d48340 316
bmazzeo 14:18f159d48340 317 /**
bmazzeo 14:18f159d48340 318 * @brief Converts audio data in buffer to floating point representation.
bmazzeo 14:18f159d48340 319 * @param L_out: Pointer to Left channel in data (float)
bmazzeo 14:18f159d48340 320 * @param R_out: Pointer to Right channel in data (float)
bmazzeo 14:18f159d48340 321 * @param buffer_out: Pointer to combined 32 bit (two 16-bit int samples)
bmazzeo 14:18f159d48340 322 * @param Length: length of data to convert
bmazzeo 14:18f159d48340 323 * @retval None
bmazzeo 14:18f159d48340 324 */
bmazzeo 16:b7dca59ab076 325 void Float_to_Audio(float* L_in, float* R_in, uint16_t* buffer_out, uint16_t Length)
bmazzeo 14:18f159d48340 326 {
justenmg 34:5bf89ab5e247 327 int16_t R;
justenmg 34:5bf89ab5e247 328 int16_t L;
justenmg 34:5bf89ab5e247 329
justenmg 34:5bf89ab5e247 330 for(uint16_t ii = 0; ii < Length; ii++)
justenmg 34:5bf89ab5e247 331 {
justenmg 34:5bf89ab5e247 332 R = *R_in;
justenmg 34:5bf89ab5e247 333 R_in++;
justenmg 34:5bf89ab5e247 334 L = *L_in;
justenmg 34:5bf89ab5e247 335 L_in++;
justenmg 34:5bf89ab5e247 336
justenmg 34:5bf89ab5e247 337 *buffer_out = R;
justenmg 34:5bf89ab5e247 338 buffer_out++;
justenmg 34:5bf89ab5e247 339 *buffer_out = L;
justenmg 34:5bf89ab5e247 340 buffer_out++;
justenmg 34:5bf89ab5e247 341 }
bmazzeo 14:18f159d48340 342 }
bmazzeo 14:18f159d48340 343
bmazzeo 14:18f159d48340 344
bmazzeo 14:18f159d48340 345
bmazzeo 6:e689075b04ed 346
bmazzeo 6:e689075b04ed 347
adustm 0:da04816fb411 348 /*-------------------------------------------------------------------------------------
adustm 0:da04816fb411 349 Callbacks implementation:
adustm 0:da04816fb411 350 the callbacks API are defined __weak in the stm32746g_discovery_audio.c file
adustm 0:da04816fb411 351 and their implementation should be done in the user code if they are needed.
adustm 0:da04816fb411 352 Below some examples of callback implementations.
adustm 0:da04816fb411 353 -------------------------------------------------------------------------------------*/
adustm 0:da04816fb411 354 /**
adustm 0:da04816fb411 355 * @brief Manages the DMA Transfer complete interrupt.
adustm 0:da04816fb411 356 * @param None
adustm 0:da04816fb411 357 * @retval None
adustm 0:da04816fb411 358 */
adustm 0:da04816fb411 359 void BSP_AUDIO_IN_TransferComplete_CallBack(void)
adustm 0:da04816fb411 360 {
Jerome Coutant 5:66c230f74325 361 audio_rec_buffer_state = BUFFER_OFFSET_FULL;
adustm 0:da04816fb411 362 }
adustm 0:da04816fb411 363
adustm 0:da04816fb411 364 /**
adustm 0:da04816fb411 365 * @brief Manages the DMA Half Transfer complete interrupt.
adustm 0:da04816fb411 366 * @param None
adustm 0:da04816fb411 367 * @retval None
adustm 0:da04816fb411 368 */
adustm 0:da04816fb411 369 void BSP_AUDIO_IN_HalfTransfer_CallBack(void)
adustm 0:da04816fb411 370 {
Jerome Coutant 5:66c230f74325 371 audio_rec_buffer_state = BUFFER_OFFSET_HALF;
adustm 0:da04816fb411 372 }
adustm 0:da04816fb411 373
Jerome Coutant 5:66c230f74325 374 /**
Jerome Coutant 5:66c230f74325 375 * @brief Audio IN Error callback function.
Jerome Coutant 5:66c230f74325 376 * @param None
Jerome Coutant 5:66c230f74325 377 * @retval None
Jerome Coutant 5:66c230f74325 378 */
Jerome Coutant 5:66c230f74325 379 void BSP_AUDIO_IN_Error_CallBack(void)
adustm 0:da04816fb411 380 {
Jerome Coutant 5:66c230f74325 381 printf("BSP_AUDIO_IN_Error_CallBack\n");
adustm 0:da04816fb411 382 }