Grissell Esquivel / Mbed 2 deprecated Seniales-Tacometro-Bueno

Funcional

Dependencies:   FastAnalogIn HSI2RGBW_PWM NVIC_set_all_priorities mbed-dsp mbed TextLCD

Fork of Seniales-Tacometro by Grissell Esquivel

main.cpp@0:0c037aff5039, 2014-02-25 (annotated)

Committer:
frankvnk
Date:
Tue Feb 25 17:42:59 2014 +0000
Revision:
0:0c037aff5039
Child:
1:736b34e0f484
Initial release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
frankvnk 0:0c037aff5039 1 // Audio Spectrum Display
frankvnk 0:0c037aff5039 2 // Copyright 2013 Tony DiCola (tony@tonydicola.com)
frankvnk 0:0c037aff5039 3 // Code ported from the guide at http://learn.adafruit.com/fft-fun-with-fourier-transforms?view=all
frankvnk 0:0c037aff5039 4
frankvnk 0:0c037aff5039 5 #include "mbed.h"
frankvnk 0:0c037aff5039 6 #include "NVIC_set_all_priorities.h"
frankvnk 0:0c037aff5039 7 #include <ctype.h>
frankvnk 0:0c037aff5039 8 #include "arm_math.h"
frankvnk 0:0c037aff5039 9 #include "hsi2rgbw_pwm.h"
frankvnk 0:0c037aff5039 10
frankvnk 0:0c037aff5039 11 Serial pc(USBTX, USBRX);
frankvnk 0:0c037aff5039 12
frankvnk 0:0c037aff5039 13 AnalogIn left(PTC2);
frankvnk 0:0c037aff5039 14 AnalogIn right(PTB3);
frankvnk 0:0c037aff5039 15
frankvnk 0:0c037aff5039 16 //#define RGBW_ext // Disable this line when you want to use the KL25Z on-board RGB LED.
frankvnk 0:0c037aff5039 17
frankvnk 0:0c037aff5039 18 #ifndef RGBW_ext
frankvnk 0:0c037aff5039 19 // HSI to RGB conversion with direct output to PWM channels - on-board RGB LED
frankvnk 0:0c037aff5039 20 hsi2rgbw_pwm led(LED_RED, LED_GREEN, LED_BLUE);
frankvnk 0:0c037aff5039 21 #else
frankvnk 0:0c037aff5039 22 // HSI to RGBW conversion with direct output to external PWM channels - RGBW LED
frankvnk 0:0c037aff5039 23 hsi2rgbw_pwm led(PTD4, PTA12, PTA4, PTA5); //Red, Green, Blue, White
frankvnk 0:0c037aff5039 24 #endif
frankvnk 0:0c037aff5039 25
frankvnk 0:0c037aff5039 26 // Dummy ISR for disabling NMI on PTA4 - !! DO NOT REMOVE THIS !!
frankvnk 0:0c037aff5039 27 // More info at https://mbed.org/questions/1387/How-can-I-access-the-FTFA_FOPT-register-/
frankvnk 0:0c037aff5039 28 extern "C" void NMI_Handler() {
frankvnk 0:0c037aff5039 29 DigitalIn test(PTA4);
frankvnk 0:0c037aff5039 30 }
frankvnk 0:0c037aff5039 31
frankvnk 0:0c037aff5039 32
frankvnk 0:0c037aff5039 33 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 34 // CONFIGURATION
frankvnk 0:0c037aff5039 35 // These values can be changed to alter the behavior of the spectrum display.
frankvnk 0:0c037aff5039 36 // KL25Z limitations
frankvnk 0:0c037aff5039 37 // -----------------
frankvnk 0:0c037aff5039 38 // - When used without the Spectrogram python script :
frankvnk 0:0c037aff5039 39 // When SAMPLE_RATE_HZ = 10000...40000, max allowed FFT_SIZE is 16.
frankvnk 0:0c037aff5039 40 // When SAMPLE_RATE_HZ < 9000, FFT can go up to 256
frankvnk 0:0c037aff5039 41 // - When used with the Spectrogram python script :
frankvnk 0:0c037aff5039 42 // There is a substantial time lag between the music and the screen output.
frankvnk 0:0c037aff5039 43 // Max allowed SAMPLE_RATE_HZ is 8000
frankvnk 0:0c037aff5039 44 // Max allowed FFT_SIZE is 16
frankvnk 0:0c037aff5039 45 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 46
frankvnk 0:0c037aff5039 47 int SLOWDOWN = 16; // Create an optical delay in spectrumLoop - useful when only one RGB led is used.
frankvnk 0:0c037aff5039 48 // Only active when nonzero.
frankvnk 0:0c037aff5039 49 // A value >= 1000 and <= 1000 + PIXEL_COUNT fixes the output to a single frequency
frankvnk 0:0c037aff5039 50 // window = a single color.
frankvnk 0:0c037aff5039 51 int SAMPLE_RATE_HZ = 40000; // Sample rate of the audio in hertz.
frankvnk 0:0c037aff5039 52 float SPECTRUM_MIN_DB = 30.0; // Audio intensity (in decibels) that maps to low LED brightness.
frankvnk 0:0c037aff5039 53 float SPECTRUM_MAX_DB = 60.0; // Audio intensity (in decibels) that maps to high LED brightness.
frankvnk 0:0c037aff5039 54 int LEDS_ENABLED = 1; // Control if the LED's should display the spectrum or not. 1 is true, 0 is false.
frankvnk 0:0c037aff5039 55 // Useful for turning the LED display on and off with commands from the serial port.
frankvnk 0:0c037aff5039 56 const int FFT_SIZE = 16; // Size of the FFT.
frankvnk 0:0c037aff5039 57 const int PIXEL_COUNT = 8; // Number of pixels. You should be able to increase this without
frankvnk 0:0c037aff5039 58 // any other changes to the program.
frankvnk 0:0c037aff5039 59 const int MAX_CHARS = 65; // Max size of the input command buffer
frankvnk 0:0c037aff5039 60
frankvnk 0:0c037aff5039 61 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 62 // INTERNAL STATE
frankvnk 0:0c037aff5039 63 // These shouldn't be modified unless you know what you're doing.
frankvnk 0:0c037aff5039 64 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 65 Ticker samplingTimer;
frankvnk 0:0c037aff5039 66 float samples[FFT_SIZE*2];
frankvnk 0:0c037aff5039 67 float magnitudes[FFT_SIZE];
frankvnk 0:0c037aff5039 68 int sampleCounter = 0;
frankvnk 0:0c037aff5039 69 char commandBuffer[MAX_CHARS];
frankvnk 0:0c037aff5039 70 float frequencyWindow[PIXEL_COUNT+1];
frankvnk 0:0c037aff5039 71 float hues[PIXEL_COUNT];
frankvnk 0:0c037aff5039 72 bool commandRecv = 0;
frankvnk 0:0c037aff5039 73 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 74 // UTILITY FUNCTIONS
frankvnk 0:0c037aff5039 75 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 76
frankvnk 0:0c037aff5039 77 void rxisr() {
frankvnk 0:0c037aff5039 78 char c = pc.getc();
frankvnk 0:0c037aff5039 79 // Add any characters that aren't the end of a command (semicolon) to the input buffer.
frankvnk 0:0c037aff5039 80 if (c != ';') {
frankvnk 0:0c037aff5039 81 c = toupper(c);
frankvnk 0:0c037aff5039 82 strncat(commandBuffer, &c, 1);
frankvnk 0:0c037aff5039 83 } else {
frankvnk 0:0c037aff5039 84 // Parse the command because an end of command token was encountered.
frankvnk 0:0c037aff5039 85 commandRecv = 1;
frankvnk 0:0c037aff5039 86 }
frankvnk 0:0c037aff5039 87 }
frankvnk 0:0c037aff5039 88
frankvnk 0:0c037aff5039 89 // Compute the average magnitude of a target frequency window vs. all other frequencies.
frankvnk 0:0c037aff5039 90 void windowMean(float* magnitudes, int lowBin, int highBin, float* windowMean, float* otherMean)
frankvnk 0:0c037aff5039 91 {
frankvnk 0:0c037aff5039 92 *windowMean = 0;
frankvnk 0:0c037aff5039 93 *otherMean = 0;
frankvnk 0:0c037aff5039 94 // Notice the first magnitude bin is skipped because it represents the
frankvnk 0:0c037aff5039 95 // average power of the signal.
frankvnk 0:0c037aff5039 96 for (int i = 1; i < FFT_SIZE/2; ++i) {
frankvnk 0:0c037aff5039 97 if (i >= lowBin && i <= highBin) {
frankvnk 0:0c037aff5039 98 *windowMean += magnitudes[i];
frankvnk 0:0c037aff5039 99 } else {
frankvnk 0:0c037aff5039 100 *otherMean += magnitudes[i];
frankvnk 0:0c037aff5039 101 }
frankvnk 0:0c037aff5039 102 }
frankvnk 0:0c037aff5039 103 *windowMean /= (highBin - lowBin) + 1;
frankvnk 0:0c037aff5039 104 *otherMean /= (FFT_SIZE / 2 - (highBin - lowBin));
frankvnk 0:0c037aff5039 105 }
frankvnk 0:0c037aff5039 106
frankvnk 0:0c037aff5039 107 // Convert a frequency to the appropriate FFT bin it will fall within.
frankvnk 0:0c037aff5039 108 int frequencyToBin(float frequency)
frankvnk 0:0c037aff5039 109 {
frankvnk 0:0c037aff5039 110 float binFrequency = float(SAMPLE_RATE_HZ) / float(FFT_SIZE);
frankvnk 0:0c037aff5039 111 return int(frequency / binFrequency);
frankvnk 0:0c037aff5039 112 }
frankvnk 0:0c037aff5039 113
frankvnk 0:0c037aff5039 114
frankvnk 0:0c037aff5039 115 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 116 // SPECTRUM DISPLAY FUNCTIONS
frankvnk 0:0c037aff5039 117 ///////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 118
frankvnk 0:0c037aff5039 119 void spectrumSetup()
frankvnk 0:0c037aff5039 120 {
frankvnk 0:0c037aff5039 121 // Set the frequency window values by evenly dividing the possible frequency
frankvnk 0:0c037aff5039 122 // spectrum across the number of neo pixels.
frankvnk 0:0c037aff5039 123 float windowSize = (SAMPLE_RATE_HZ / 2.0) / float(PIXEL_COUNT);
frankvnk 0:0c037aff5039 124 for (int i = 0; i < PIXEL_COUNT+1; ++i) {
frankvnk 0:0c037aff5039 125 frequencyWindow[i] = i*windowSize;
frankvnk 0:0c037aff5039 126 }
frankvnk 0:0c037aff5039 127 // Evenly spread hues across all pixels.
frankvnk 0:0c037aff5039 128 for (int i = 0; i < PIXEL_COUNT; ++i) {
frankvnk 0:0c037aff5039 129 hues[i] = 360.0*(float(i)/float(PIXEL_COUNT-1));
frankvnk 0:0c037aff5039 130 }
frankvnk 0:0c037aff5039 131 }
frankvnk 0:0c037aff5039 132
frankvnk 0:0c037aff5039 133 void spectrumLoop()
frankvnk 0:0c037aff5039 134 {
frankvnk 0:0c037aff5039 135 // Update each LED based on the intensity of the audio
frankvnk 0:0c037aff5039 136 // in the associated frequency window.
frankvnk 0:0c037aff5039 137 static int SLrpt = 0, SLpixcnt = 0;
frankvnk 0:0c037aff5039 138 int SLpixend = 0;
frankvnk 0:0c037aff5039 139 float intensity, otherMean;
frankvnk 0:0c037aff5039 140 if(SLOWDOWN != 0)
frankvnk 0:0c037aff5039 141 {
frankvnk 0:0c037aff5039 142 if(SLOWDOWN >= 1000)
frankvnk 0:0c037aff5039 143 {
frankvnk 0:0c037aff5039 144 if(SLOWDOWN <= (1000 + PIXEL_COUNT-1))
frankvnk 0:0c037aff5039 145 {
frankvnk 0:0c037aff5039 146 SLpixcnt = SLOWDOWN - 1000;
frankvnk 0:0c037aff5039 147 SLrpt = 0;
frankvnk 0:0c037aff5039 148 SLpixend = SLpixcnt + 1;
frankvnk 0:0c037aff5039 149 }
frankvnk 0:0c037aff5039 150 else
frankvnk 0:0c037aff5039 151 SLOWDOWN = 0;
frankvnk 0:0c037aff5039 152 }
frankvnk 0:0c037aff5039 153 else
frankvnk 0:0c037aff5039 154 {
frankvnk 0:0c037aff5039 155 SLrpt++;
frankvnk 0:0c037aff5039 156 if (SLrpt >= SLOWDOWN)
frankvnk 0:0c037aff5039 157 {
frankvnk 0:0c037aff5039 158 SLrpt = 0;
frankvnk 0:0c037aff5039 159 SLpixcnt = SLpixcnt < PIXEL_COUNT-1 ? ++SLpixcnt : 0;
frankvnk 0:0c037aff5039 160 }
frankvnk 0:0c037aff5039 161 SLpixend = SLpixcnt + 1;
frankvnk 0:0c037aff5039 162 }
frankvnk 0:0c037aff5039 163 }
frankvnk 0:0c037aff5039 164 else
frankvnk 0:0c037aff5039 165 {
frankvnk 0:0c037aff5039 166 SLpixcnt = 0;
frankvnk 0:0c037aff5039 167 SLrpt = 0;
frankvnk 0:0c037aff5039 168 SLpixend = PIXEL_COUNT;
frankvnk 0:0c037aff5039 169 }
frankvnk 0:0c037aff5039 170 for (int i = SLpixcnt; i < SLpixend; ++i) {
frankvnk 0:0c037aff5039 171 windowMean(magnitudes,
frankvnk 0:0c037aff5039 172 frequencyToBin(frequencyWindow[i]),
frankvnk 0:0c037aff5039 173 frequencyToBin(frequencyWindow[i+1]),
frankvnk 0:0c037aff5039 174 &intensity,
frankvnk 0:0c037aff5039 175 &otherMean);
frankvnk 0:0c037aff5039 176 // Convert intensity to decibels.
frankvnk 0:0c037aff5039 177 intensity = 20.0*log10(intensity);
frankvnk 0:0c037aff5039 178 // Scale the intensity and clamp between 0 and 1.0.
frankvnk 0:0c037aff5039 179 intensity -= SPECTRUM_MIN_DB;
frankvnk 0:0c037aff5039 180 intensity = intensity < 0.0 ? 0.0 : intensity;
frankvnk 0:0c037aff5039 181 intensity /= (SPECTRUM_MAX_DB-SPECTRUM_MIN_DB);
frankvnk 0:0c037aff5039 182 intensity = intensity > 1.0 ? 1.0 : intensity;
frankvnk 0:0c037aff5039 183 led.hsi2rgbw(hues[i], 1.0, intensity);
frankvnk 0:0c037aff5039 184 }
frankvnk 0:0c037aff5039 185 }
frankvnk 0:0c037aff5039 186
frankvnk 0:0c037aff5039 187
frankvnk 0:0c037aff5039 188 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 189 // SAMPLING FUNCTIONS
frankvnk 0:0c037aff5039 190 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 191
frankvnk 0:0c037aff5039 192 void samplingCallback()
frankvnk 0:0c037aff5039 193 {
frankvnk 0:0c037aff5039 194 // Read from the ADC and store the sample data
frankvnk 0:0c037aff5039 195 samples[sampleCounter] = 1023 * ((left + right)/2);
frankvnk 0:0c037aff5039 196 // Complex FFT functions require a coefficient for the imaginary part of the input.
frankvnk 0:0c037aff5039 197 // Since we only have real data, set this coefficient to zero.
frankvnk 0:0c037aff5039 198 samples[sampleCounter+1] = 0.0;
frankvnk 0:0c037aff5039 199 // Update sample buffer position and stop after the buffer is filled
frankvnk 0:0c037aff5039 200 sampleCounter += 2;
frankvnk 0:0c037aff5039 201 if (sampleCounter >= FFT_SIZE*2) {
frankvnk 0:0c037aff5039 202 samplingTimer.detach();
frankvnk 0:0c037aff5039 203 }
frankvnk 0:0c037aff5039 204 }
frankvnk 0:0c037aff5039 205
frankvnk 0:0c037aff5039 206 void samplingBegin()
frankvnk 0:0c037aff5039 207 {
frankvnk 0:0c037aff5039 208 // Reset sample buffer position and start callback at necessary rate.
frankvnk 0:0c037aff5039 209 sampleCounter = 0;
frankvnk 0:0c037aff5039 210 samplingTimer.attach_us(&samplingCallback, 1000000/SAMPLE_RATE_HZ);
frankvnk 0:0c037aff5039 211 }
frankvnk 0:0c037aff5039 212
frankvnk 0:0c037aff5039 213 bool samplingIsDone()
frankvnk 0:0c037aff5039 214 {
frankvnk 0:0c037aff5039 215 return sampleCounter >= FFT_SIZE*2;
frankvnk 0:0c037aff5039 216 }
frankvnk 0:0c037aff5039 217
frankvnk 0:0c037aff5039 218
frankvnk 0:0c037aff5039 219 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 220 // COMMAND PARSING FUNCTIONS
frankvnk 0:0c037aff5039 221 // These functions allow parsing simple commands input on the serial port.
frankvnk 0:0c037aff5039 222 // Commands allow reading and writing variables that control the device.
frankvnk 0:0c037aff5039 223 //
frankvnk 0:0c037aff5039 224 // All commands must end with a semicolon character.
frankvnk 0:0c037aff5039 225 //
frankvnk 0:0c037aff5039 226 // Example commands are:
frankvnk 0:0c037aff5039 227 // GET SAMPLE_RATE_HZ;
frankvnk 0:0c037aff5039 228 // - Get the sample rate of the device.
frankvnk 0:0c037aff5039 229 // SET SAMPLE_RATE_HZ 400;
frankvnk 0:0c037aff5039 230 // - Set the sample rate of the device to 400 hertz.
frankvnk 0:0c037aff5039 231 //
frankvnk 0:0c037aff5039 232 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 233
frankvnk 0:0c037aff5039 234 void parseCommand(char* command)
frankvnk 0:0c037aff5039 235 {
frankvnk 0:0c037aff5039 236 if (strcmp(command, "GET MAGNITUDES") == 0) {
frankvnk 0:0c037aff5039 237 for (int i = 0; i < FFT_SIZE; ++i) {
frankvnk 0:0c037aff5039 238 printf("%f\r\n", magnitudes[i]);
frankvnk 0:0c037aff5039 239 }
frankvnk 0:0c037aff5039 240 } else if (strcmp(command, "GET SAMPLES") == 0) {
frankvnk 0:0c037aff5039 241 for (int i = 0; i < FFT_SIZE*2; i+=2) {
frankvnk 0:0c037aff5039 242 printf("%f\r\n", samples[i]);
frankvnk 0:0c037aff5039 243 }
frankvnk 0:0c037aff5039 244 } else if (strcmp(command, "GET FFT_SIZE") == 0) {
frankvnk 0:0c037aff5039 245 printf("%d\r\n", FFT_SIZE);
frankvnk 0:0c037aff5039 246 } else if (strcmp(command, "GET SAMPLE_RATE_HZ") == 0) {
frankvnk 0:0c037aff5039 247 printf("%d\r\n", SAMPLE_RATE_HZ);
frankvnk 0:0c037aff5039 248 } else if (strstr(command, "SET SAMPLE_RATE_HZ") != NULL) {
frankvnk 0:0c037aff5039 249 SAMPLE_RATE_HZ = (typeof(SAMPLE_RATE_HZ)) atof(command+(sizeof("SET SAMPLE_RATE_HZ")-1));
frankvnk 0:0c037aff5039 250 } else if (strcmp(command, "GET LEDS_ENABLED") == 0) {
frankvnk 0:0c037aff5039 251 printf("%d\r\n", LEDS_ENABLED);
frankvnk 0:0c037aff5039 252 } else if (strstr(command, "SET LEDS_ENABLED") != NULL) {
frankvnk 0:0c037aff5039 253 LEDS_ENABLED = (typeof(LEDS_ENABLED)) atof(command+(sizeof("SET LEDS_ENABLED")-1));
frankvnk 0:0c037aff5039 254 } else if (strcmp(command, "GET SPECTRUM_MIN_DB") == 0) {
frankvnk 0:0c037aff5039 255 printf("%f\r\n", SPECTRUM_MIN_DB);
frankvnk 0:0c037aff5039 256 } else if (strstr(command, "SET SPECTRUM_MIN_DB") != NULL) {
frankvnk 0:0c037aff5039 257 SPECTRUM_MIN_DB = (typeof(SPECTRUM_MIN_DB)) atof(command+(sizeof("SET SPECTRUM_MIN_DB")-1));
frankvnk 0:0c037aff5039 258 } else if (strcmp(command, "GET SPECTRUM_MAX_DB") == 0) {
frankvnk 0:0c037aff5039 259 printf("%f\r\n", SPECTRUM_MAX_DB);
frankvnk 0:0c037aff5039 260 } else if (strstr(command, "SET SPECTRUM_MAX_DB") != NULL) {
frankvnk 0:0c037aff5039 261 SPECTRUM_MAX_DB = (typeof(SPECTRUM_MAX_DB)) atof(command+(sizeof("SET SPECTRUM_MAX_DB")-1));
frankvnk 0:0c037aff5039 262 } else if (strcmp(command, "GET SLOWDOWN") == 0) {
frankvnk 0:0c037aff5039 263 printf("%d\r\n", SLOWDOWN);
frankvnk 0:0c037aff5039 264 } else if (strstr(command, "SET SLOWDOWN") != NULL) {
frankvnk 0:0c037aff5039 265 SLOWDOWN = (typeof(SLOWDOWN)) atoi(command+(sizeof("SET SLOWDOWN")-1));
frankvnk 0:0c037aff5039 266 }
frankvnk 0:0c037aff5039 267
frankvnk 0:0c037aff5039 268 // Update spectrum display values if sample rate was changed.
frankvnk 0:0c037aff5039 269 if (strstr(command, "SET SAMPLE_RATE_HZ ") != NULL) {
frankvnk 0:0c037aff5039 270 spectrumSetup();
frankvnk 0:0c037aff5039 271 }
frankvnk 0:0c037aff5039 272
frankvnk 0:0c037aff5039 273 // Turn off the LEDs if the state changed.
frankvnk 0:0c037aff5039 274 if (LEDS_ENABLED == 0) {
frankvnk 0:0c037aff5039 275 }
frankvnk 0:0c037aff5039 276 }
frankvnk 0:0c037aff5039 277
frankvnk 0:0c037aff5039 278 void parserLoop()
frankvnk 0:0c037aff5039 279 {
frankvnk 0:0c037aff5039 280 // Process any incoming characters from the serial port
frankvnk 0:0c037aff5039 281 while (pc.readable()) {
frankvnk 0:0c037aff5039 282 char c = pc.getc();
frankvnk 0:0c037aff5039 283 // Add any characters that aren't the end of a command (semicolon) to the input buffer.
frankvnk 0:0c037aff5039 284 if (c != ';') {
frankvnk 0:0c037aff5039 285 c = toupper(c);
frankvnk 0:0c037aff5039 286 strncat(commandBuffer, &c, 1);
frankvnk 0:0c037aff5039 287 } else {
frankvnk 0:0c037aff5039 288 // Parse the command because an end of command token was encountered.
frankvnk 0:0c037aff5039 289 parseCommand(commandBuffer);
frankvnk 0:0c037aff5039 290 // Clear the input buffer
frankvnk 0:0c037aff5039 291 memset(commandBuffer, 0, sizeof(commandBuffer));
frankvnk 0:0c037aff5039 292 }
frankvnk 0:0c037aff5039 293 }
frankvnk 0:0c037aff5039 294 }
frankvnk 0:0c037aff5039 295
frankvnk 0:0c037aff5039 296 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 297 // MAIN FUNCTION
frankvnk 0:0c037aff5039 298 ////////////////////////////////////////////////////////////////////////////////
frankvnk 0:0c037aff5039 299
frankvnk 0:0c037aff5039 300 int main()
frankvnk 0:0c037aff5039 301 {
frankvnk 0:0c037aff5039 302 NVIC_set_all_irq_priorities(1);
frankvnk 0:0c037aff5039 303 NVIC_SetPriority(UART0_IRQn, 0);
frankvnk 0:0c037aff5039 304 // Set up serial port.
frankvnk 0:0c037aff5039 305 pc.baud (38400);
frankvnk 0:0c037aff5039 306 pc.attach(&rxisr);
frankvnk 0:0c037aff5039 307 #ifndef RGBW_ext
frankvnk 0:0c037aff5039 308 led.invertpwm(1); //On-board KL25Z RGB LED uses common anode.
frankvnk 0:0c037aff5039 309 #endif
frankvnk 0:0c037aff5039 310 // Clear the input command buffer
frankvnk 0:0c037aff5039 311 memset(commandBuffer, 0, sizeof(commandBuffer));
frankvnk 0:0c037aff5039 312
frankvnk 0:0c037aff5039 313 // Initialize spectrum display
frankvnk 0:0c037aff5039 314 spectrumSetup();
frankvnk 0:0c037aff5039 315
frankvnk 0:0c037aff5039 316 // Begin sampling audio
frankvnk 0:0c037aff5039 317 samplingBegin();
frankvnk 0:0c037aff5039 318
frankvnk 0:0c037aff5039 319 while(1) {
frankvnk 0:0c037aff5039 320 // Calculate FFT if a full sample is available.
frankvnk 0:0c037aff5039 321 if (samplingIsDone()) {
frankvnk 0:0c037aff5039 322 // Run FFT on sample data.
frankvnk 0:0c037aff5039 323 arm_cfft_radix4_instance_f32 fft_inst;
frankvnk 0:0c037aff5039 324 arm_cfft_radix4_init_f32(&fft_inst, FFT_SIZE, 0, 1);
frankvnk 0:0c037aff5039 325 arm_cfft_radix4_f32(&fft_inst, samples);
frankvnk 0:0c037aff5039 326 // Calculate magnitude of complex numbers output by the FFT.
frankvnk 0:0c037aff5039 327 arm_cmplx_mag_f32(samples, magnitudes, FFT_SIZE);
frankvnk 0:0c037aff5039 328
frankvnk 0:0c037aff5039 329 if (LEDS_ENABLED == 1) {
frankvnk 0:0c037aff5039 330 spectrumLoop();
frankvnk 0:0c037aff5039 331 }
frankvnk 0:0c037aff5039 332
frankvnk 0:0c037aff5039 333 // Restart audio sampling.
frankvnk 0:0c037aff5039 334 samplingBegin();
frankvnk 0:0c037aff5039 335 }
frankvnk 0:0c037aff5039 336
frankvnk 0:0c037aff5039 337 // Parse any pending commands.
frankvnk 0:0c037aff5039 338 if(commandRecv) {
frankvnk 0:0c037aff5039 339 // pc.attach(NULL);
frankvnk 0:0c037aff5039 340 parseCommand(commandBuffer);
frankvnk 0:0c037aff5039 341 commandRecv = 0;
frankvnk 0:0c037aff5039 342 // Clear the input buffer
frankvnk 0:0c037aff5039 343 memset(commandBuffer, 0, sizeof(commandBuffer));
frankvnk 0:0c037aff5039 344 // pc.attach(&rxisr);
frankvnk 0:0c037aff5039 345 }
frankvnk 0:0c037aff5039 346 }
frankvnk 0:0c037aff5039 347 }