Tobias Wulf / Mbed 2 deprecated DiscoTech

Program to convert audio signals in RGB LED animations. Requests hardware peripherals (DiscoTech PCB). EESTEC Workshop September 2013 LC Hamburg.

Dependencies:   PwmDAC ShiftReg Terminal adc mbed

main.cpp@0:59f7c34059ec, 2013-09-23 (annotated)

Committer:
flash_ahaa
Date:
Mon Sep 23 11:21:28 2013 +0000
Revision:
0:59f7c34059ec
EESTEC Workshop September 2013 LC Hamburg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
flash_ahaa 0:59f7c34059ec 1 /* This program executes an audio to rgb light conversion.
flash_ahaa 0:59f7c34059ec 2 * It is made for an international EESTEC Workshop by LC Hamburg.
flash_ahaa 0:59f7c34059ec 3 * This works on mbed LPC1768 with hardware peripherals on pcb.
flash_ahaa 0:59f7c34059ec 4 * It converts a stereo (to chan. mixed to mono) signal to light animation
flash_ahaa 0:59f7c34059ec 5 * Using digital filters or any alogrithm you prefer to convert music into ligth
flash_ahaa 0:59f7c34059ec 6 * It controlls 3 RGB LED stripes powerlines with 74HC595 shift
flash_ahaa 0:59f7c34059ec 7 * register.
flash_ahaa 0:59f7c34059ec 8 *
flash_ahaa 0:59f7c34059ec 9 * Project: DiscoTech
flash_ahaa 0:59f7c34059ec 10 * HDK/ SDK Eng: Tobias Wulf
flash_ahaa 0:59f7c34059ec 11 * Date: 21.09.2013
flash_ahaa 0:59f7c34059ec 12 *
flash_ahaa 0:59f7c34059ec 13 */
flash_ahaa 0:59f7c34059ec 14
flash_ahaa 0:59f7c34059ec 15 #include "mbed.h"
flash_ahaa 0:59f7c34059ec 16 #include "Terminal.h"
flash_ahaa 0:59f7c34059ec 17
flash_ahaa 0:59f7c34059ec 18 #include "adc.h"
flash_ahaa 0:59f7c34059ec 19 #include "PwmDAC.h"
flash_ahaa 0:59f7c34059ec 20 #include "ShiftReg.h"
flash_ahaa 0:59f7c34059ec 21
flash_ahaa 0:59f7c34059ec 22 #include "stdlib.h"
flash_ahaa 0:59f7c34059ec 23
flash_ahaa 0:59f7c34059ec 24 #define SAMPLE_RATE 48000 //Hz
flash_ahaa 0:59f7c34059ec 25 #define ADC_BIAS 1.65 //Volts
flash_ahaa 0:59f7c34059ec 26 #define ULSB 3.3 / 4095
flash_ahaa 0:59f7c34059ec 27 #define RESOLUTION 256
flash_ahaa 0:59f7c34059ec 28
flash_ahaa 0:59f7c34059ec 29 #define MASK 0x07 // for shift register
flash_ahaa 0:59f7c34059ec 30
flash_ahaa 0:59f7c34059ec 31 /* declair your functions
flash_ahaa 0:59f7c34059ec 32 * isr routine doesn't have to be declaired
flash_ahaa 0:59f7c34059ec 33 */
flash_ahaa 0:59f7c34059ec 34 void mainInit();
flash_ahaa 0:59f7c34059ec 35
flash_ahaa 0:59f7c34059ec 36
flash_ahaa 0:59f7c34059ec 37 PwmDAC rgb;
flash_ahaa 0:59f7c34059ec 38 ADC adc(SAMPLE_RATE, 1);
flash_ahaa 0:59f7c34059ec 39 //AnalogOut dac(p18);
flash_ahaa 0:59f7c34059ec 40 ShiftReg LEDstripes(p30, p29, p28);
flash_ahaa 0:59f7c34059ec 41
flash_ahaa 0:59f7c34059ec 42 /* Serial communication via usb uplink to pc
flash_ahaa 0:59f7c34059ec 43 * to display what ever you want in the terminal
flash_ahaa 0:59f7c34059ec 44 * or to send what ever you want from the terminal
flash_ahaa 0:59f7c34059ec 45 */
flash_ahaa 0:59f7c34059ec 46 Terminal usbPC(USBTX, USBRX);
flash_ahaa 0:59f7c34059ec 47
flash_ahaa 0:59f7c34059ec 48 /* array for updating the PwmDAC object
flash_ahaa 0:59f7c34059ec 49 * and pointers for easy work
flash_ahaa 0:59f7c34059ec 50 * we use steps 1 3 5 ...point'em
flash_ahaa 0:59f7c34059ec 51 */
flash_ahaa 0:59f7c34059ec 52 double channels[6];
flash_ahaa 0:59f7c34059ec 53
flash_ahaa 0:59f7c34059ec 54 /*
flash_ahaa 0:59f7c34059ec 55 uint32_t *redChan;
flash_ahaa 0:59f7c34059ec 56 uint32_t *greenChan;
flash_ahaa 0:59f7c34059ec 57 uint32_t *blueChan;
flash_ahaa 0:59f7c34059ec 58 */
flash_ahaa 0:59f7c34059ec 59
flash_ahaa 0:59f7c34059ec 60 /* global variables to work in the adc interrupt
flash_ahaa 0:59f7c34059ec 61 * service routine to get the data from interrupt
flash_ahaa 0:59f7c34059ec 62 */
flash_ahaa 0:59f7c34059ec 63
flash_ahaa 0:59f7c34059ec 64 unsigned int pattern = 0;
flash_ahaa 0:59f7c34059ec 65 double newSample;
flash_ahaa 0:59f7c34059ec 66
flash_ahaa 0:59f7c34059ec 67 bool adcActive = true;
flash_ahaa 0:59f7c34059ec 68
flash_ahaa 0:59f7c34059ec 69
flash_ahaa 0:59f7c34059ec 70
flash_ahaa 0:59f7c34059ec 71 int main() {
flash_ahaa 0:59f7c34059ec 72
flash_ahaa 0:59f7c34059ec 73 // LP for output pwm channel 1
flash_ahaa 0:59f7c34059ec 74 double b1[3] = {0.207481, 0.414962, 0.207481};
flash_ahaa 0:59f7c34059ec 75 double a1[2] = {-0.170076, 0.542269};
flash_ahaa 0:59f7c34059ec 76 double w1[3] = {0.0, 0.0, 0.0};
flash_ahaa 0:59f7c34059ec 77 double y1 = 0.0;
flash_ahaa 0:59f7c34059ec 78
flash_ahaa 0:59f7c34059ec 79 // HP for output pwm channel 3
flash_ahaa 0:59f7c34059ec 80 double b3[3] = {0.365315, 0.730629, 0.365315};
flash_ahaa 0:59f7c34059ec 81 double a3[2] = {-0.417651, 0.043608};
flash_ahaa 0:59f7c34059ec 82 double w3[3] = {0.0, 0.0, 0.0};
flash_ahaa 0:59f7c34059ec 83 double y3 = 0.0;
flash_ahaa 0:59f7c34059ec 84
flash_ahaa 0:59f7c34059ec 85 //BP - HP for output to LP
flash_ahaa 0:59f7c34059ec 86 double b5i[3] = { 1.0, -1.9884555305478397, 1.0000000000000022};
flash_ahaa 0:59f7c34059ec 87 double a5i[2] = {-1.9906581470004894, 0.99457555239826922};
flash_ahaa 0:59f7c34059ec 88 double w5i[3] = {0.0, 0.0, 0.0};
flash_ahaa 0:59f7c34059ec 89 double y5i = 0.0;
flash_ahaa 0:59f7c34059ec 90
flash_ahaa 0:59f7c34059ec 91 // BP - LP for output pwm channel 5
flash_ahaa 0:59f7c34059ec 92 double b5j[3] = {1.0, -1.9988801446006126, 1.0};
flash_ahaa 0:59f7c34059ec 93 double a5j[2] = {-1.991742261264652, 0.99502978931485908};
flash_ahaa 0:59f7c34059ec 94 double w5j[3] = {0.0, 0.0, 0.0};
flash_ahaa 0:59f7c34059ec 95 double y5j = 0.0;
flash_ahaa 0:59f7c34059ec 96
flash_ahaa 0:59f7c34059ec 97 //int counter = 0;
flash_ahaa 0:59f7c34059ec 98
flash_ahaa 0:59f7c34059ec 99 usbPC.printf("...start program\n");
flash_ahaa 0:59f7c34059ec 100 wait(0.2);
flash_ahaa 0:59f7c34059ec 101
flash_ahaa 0:59f7c34059ec 102 mainInit();
flash_ahaa 0:59f7c34059ec 103 usbPC.printf("...init completed\n");
flash_ahaa 0:59f7c34059ec 104 wait(0.2);
flash_ahaa 0:59f7c34059ec 105
flash_ahaa 0:59f7c34059ec 106 //srand(7);
flash_ahaa 0:59f7c34059ec 107
flash_ahaa 0:59f7c34059ec 108 adcActive = false;
flash_ahaa 0:59f7c34059ec 109
flash_ahaa 0:59f7c34059ec 110 while(1) {
flash_ahaa 0:59f7c34059ec 111 if(adcActive) {
flash_ahaa 0:59f7c34059ec 112 adcActive = false;
flash_ahaa 0:59f7c34059ec 113
flash_ahaa 0:59f7c34059ec 114 // first LP, chan 1 (red)
flash_ahaa 0:59f7c34059ec 115 w1[0] = newSample + (a1[0] * w1[1]) + (a1[1] * w1[2]);
flash_ahaa 0:59f7c34059ec 116 y1 = (b1[0] * w1[0]) +(b1[1] * w1[1]) + (b1[2] * w1[2]);
flash_ahaa 0:59f7c34059ec 117 w1[2] = w1[1];
flash_ahaa 0:59f7c34059ec 118 w1[1] = w1[0];
flash_ahaa 0:59f7c34059ec 119 channels[1] = (double) ((y1 + ADC_BIAS) * 100 / 3.3);
flash_ahaa 0:59f7c34059ec 120
flash_ahaa 0:59f7c34059ec 121 // first HP, chan 3 (green)
flash_ahaa 0:59f7c34059ec 122 w3[0] = newSample + (a3[0] * w3[1]) + (a3[1] * w3[2]);
flash_ahaa 0:59f7c34059ec 123 y3 = (b3[0] * w3[0]) +(b3[1] * w3[1]) + (b3[2] * w3[2]);
flash_ahaa 0:59f7c34059ec 124 w3[2] = w3[1];
flash_ahaa 0:59f7c34059ec 125 w3[1] = w3[0];
flash_ahaa 0:59f7c34059ec 126 channels[3] = (double) ((y3 + ADC_BIAS) * 100 / 3.3);
flash_ahaa 0:59f7c34059ec 127
flash_ahaa 0:59f7c34059ec 128 // first BP - HP, target BP - LP
flash_ahaa 0:59f7c34059ec 129 w5i[0] = 0.0099616678552018837 * newSample + (a5i[0] * w5i[1]) + (a5i[1] * w5i[2]);
flash_ahaa 0:59f7c34059ec 130 y5i = (b5i[0] * w5i[0]) +(b5i[1] * w5i[1]) + (b5i[2] * w5i[2]);
flash_ahaa 0:59f7c34059ec 131 w5i[2] = w5i[1];
flash_ahaa 0:59f7c34059ec 132 w5i[1] = w5i[0];
flash_ahaa 0:59f7c34059ec 133
flash_ahaa 0:59f7c34059ec 134 // first BP LP, chan 5 (blue)
flash_ahaa 0:59f7c34059ec 135 w5j[0] = y5i + (a5j[0] * w5j[1]) + (a5j[1] * w5j[2]);
flash_ahaa 0:59f7c34059ec 136 y5j = (b5j[0] * w5j[0]) +(b5j[1] * w5j[1]) + (b5j[2] * w5j[2]);
flash_ahaa 0:59f7c34059ec 137 w5j[2] = w5j[1];
flash_ahaa 0:59f7c34059ec 138 w5j[1] = w5j[0];
flash_ahaa 0:59f7c34059ec 139 channels[5] = (double) ((y5j + ADC_BIAS) * 100 / 3.3);
flash_ahaa 0:59f7c34059ec 140
flash_ahaa 0:59f7c34059ec 141 rgb.updateDuty(channels);
flash_ahaa 0:59f7c34059ec 142 }
flash_ahaa 0:59f7c34059ec 143
flash_ahaa 0:59f7c34059ec 144 usbPC.printf("Sample = %f\n", newSample);
flash_ahaa 0:59f7c34059ec 145 usbPC.printf("Chan1 = %f\n", channels[1]);
flash_ahaa 0:59f7c34059ec 146 usbPC.printf("Chan3 = %f\n", channels[3]);
flash_ahaa 0:59f7c34059ec 147 usbPC.printf("Chan5 = %f\n", channels[5]);
flash_ahaa 0:59f7c34059ec 148
flash_ahaa 0:59f7c34059ec 149 LEDstripes.ShiftByte(pattern, ShiftReg::MSBFirst);
flash_ahaa 0:59f7c34059ec 150 LEDstripes.Latch();
flash_ahaa 0:59f7c34059ec 151 LEDstripes.ShiftByte((unsigned int) MASK, ShiftReg::MSBFirst);
flash_ahaa 0:59f7c34059ec 152 LEDstripes.Latch();
flash_ahaa 0:59f7c34059ec 153
flash_ahaa 0:59f7c34059ec 154
flash_ahaa 0:59f7c34059ec 155 }
flash_ahaa 0:59f7c34059ec 156 }/* end main */
flash_ahaa 0:59f7c34059ec 157
flash_ahaa 0:59f7c34059ec 158
flash_ahaa 0:59f7c34059ec 159
flash_ahaa 0:59f7c34059ec 160
flash_ahaa 0:59f7c34059ec 161
flash_ahaa 0:59f7c34059ec 162
flash_ahaa 0:59f7c34059ec 163
flash_ahaa 0:59f7c34059ec 164
flash_ahaa 0:59f7c34059ec 165
flash_ahaa 0:59f7c34059ec 166 /* interrupt service routine from adc object
flash_ahaa 0:59f7c34059ec 167 * here should be done the data processing
flash_ahaa 0:59f7c34059ec 168 * variable and output updates
flash_ahaa 0:59f7c34059ec 169 */
flash_ahaa 0:59f7c34059ec 170 void getADC(int chan, uint32_t value) {
flash_ahaa 0:59f7c34059ec 171 adcActive = true;
flash_ahaa 0:59f7c34059ec 172 newSample = (double) adc.read(p15);
flash_ahaa 0:59f7c34059ec 173 newSample = newSample * ULSB - ADC_BIAS;
flash_ahaa 0:59f7c34059ec 174
flash_ahaa 0:59f7c34059ec 175 // maybe do something other, but do it fast!
flash_ahaa 0:59f7c34059ec 176 }
flash_ahaa 0:59f7c34059ec 177
flash_ahaa 0:59f7c34059ec 178 /* function to initialize the main program, objects and
flash_ahaa 0:59f7c34059ec 179 * implement all variables
flash_ahaa 0:59f7c34059ec 180 */
flash_ahaa 0:59f7c34059ec 181 void mainInit() {
flash_ahaa 0:59f7c34059ec 182
flash_ahaa 0:59f7c34059ec 183 for(int i=0; i<6; i++) {
flash_ahaa 0:59f7c34059ec 184 channels[i] = 0;
flash_ahaa 0:59f7c34059ec 185 }
flash_ahaa 0:59f7c34059ec 186
flash_ahaa 0:59f7c34059ec 187
flash_ahaa 0:59f7c34059ec 188 usbPC.printf("...variables implemented\n");
flash_ahaa 0:59f7c34059ec 189 wait(0.2);
flash_ahaa 0:59f7c34059ec 190
flash_ahaa 0:59f7c34059ec 191 /* setup shift register (stripe power)
flash_ahaa 0:59f7c34059ec 192 */
flash_ahaa 0:59f7c34059ec 193 LEDstripes.ShiftByte((unsigned int) MASK, ShiftReg::MSBFirst);
flash_ahaa 0:59f7c34059ec 194 LEDstripes.Latch();
flash_ahaa 0:59f7c34059ec 195 wait(0.2);
flash_ahaa 0:59f7c34059ec 196
flash_ahaa 0:59f7c34059ec 197 usbPC.printf("...shift register initialized\n");
flash_ahaa 0:59f7c34059ec 198 wait(0.2);
flash_ahaa 0:59f7c34059ec 199
flash_ahaa 0:59f7c34059ec 200 /* setup adc input
flash_ahaa 0:59f7c34059ec 201 */
flash_ahaa 0:59f7c34059ec 202 adc.append(getADC);
flash_ahaa 0:59f7c34059ec 203
flash_ahaa 0:59f7c34059ec 204 adc.startmode(0,0);
flash_ahaa 0:59f7c34059ec 205 adc.burst(1);
flash_ahaa 0:59f7c34059ec 206
flash_ahaa 0:59f7c34059ec 207 adc.setup(p15,1);
flash_ahaa 0:59f7c34059ec 208 adc.setup(p16,0);
flash_ahaa 0:59f7c34059ec 209 adc.setup(p17,0);
flash_ahaa 0:59f7c34059ec 210 adc.setup(p18,0);
flash_ahaa 0:59f7c34059ec 211 adc.setup(p19,0);
flash_ahaa 0:59f7c34059ec 212 adc.setup(p20,0);
flash_ahaa 0:59f7c34059ec 213
flash_ahaa 0:59f7c34059ec 214 adc.interrupt_state(p15,1);
flash_ahaa 0:59f7c34059ec 215
flash_ahaa 0:59f7c34059ec 216
flash_ahaa 0:59f7c34059ec 217 usbPC.printf("%u, %u, %u, %u\n", adc.setup(p15),
flash_ahaa 0:59f7c34059ec 218 adc.burst(),
flash_ahaa 0:59f7c34059ec 219 adc.interrupt_state(p15),
flash_ahaa 0:59f7c34059ec 220 adc.actual_sample_rate());
flash_ahaa 0:59f7c34059ec 221
flash_ahaa 0:59f7c34059ec 222 usbPC.printf("...ADC initialized\n");
flash_ahaa 0:59f7c34059ec 223 wait(0.2);
flash_ahaa 0:59f7c34059ec 224
flash_ahaa 0:59f7c34059ec 225 /* setup pwm output
flash_ahaa 0:59f7c34059ec 226 */
flash_ahaa 0:59f7c34059ec 227 rgb.init();
flash_ahaa 0:59f7c34059ec 228 rgb.deactivate(0);
flash_ahaa 0:59f7c34059ec 229 rgb.deactivate(2);
flash_ahaa 0:59f7c34059ec 230 rgb.deactivate(4);
flash_ahaa 0:59f7c34059ec 231 rgb.setResolution(RESOLUTION);
flash_ahaa 0:59f7c34059ec 232 rgb.start();
flash_ahaa 0:59f7c34059ec 233
flash_ahaa 0:59f7c34059ec 234 usbPC.printf("...PWM output initialized\n");
flash_ahaa 0:59f7c34059ec 235 wait(0.2);
flash_ahaa 0:59f7c34059ec 236 }