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

Files at this revision

API Documentation at this revision

Comitter:
flash_ahaa
Date:
Mon Sep 23 11:21:28 2013 +0000
Commit message:
EESTEC Workshop September 2013 LC Hamburg

Changed in this revision

PwmDAC.lib Show annotated file Show diff for this revision Revisions of this file
ShiftReg.lib Show annotated file Show diff for this revision Revisions of this file
Terminal.lib Show annotated file Show diff for this revision Revisions of this file
adc.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r 59f7c34059ec PwmDAC.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PwmDAC.lib	Mon Sep 23 11:21:28 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/flash_ahaa/code/PwmDAC/#381bd99d10a4
diff -r 000000000000 -r 59f7c34059ec ShiftReg.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ShiftReg.lib	Mon Sep 23 11:21:28 2013 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/yoonghm/code/ShiftReg/#a0e3fd47970f
diff -r 000000000000 -r 59f7c34059ec Terminal.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Terminal.lib	Mon Sep 23 11:21:28 2013 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/simon/code/Terminal/#85184c13476c
diff -r 000000000000 -r 59f7c34059ec adc.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/adc.lib	Mon Sep 23 11:21:28 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/flash_ahaa/code/adc/#b05e4f5e2c8c
diff -r 000000000000 -r 59f7c34059ec main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 23 11:21:28 2013 +0000
@@ -0,0 +1,236 @@
+/* This program executes an audio to rgb light conversion.
+ * It is made for an international EESTEC Workshop by LC Hamburg.
+ * This works on mbed LPC1768 with hardware peripherals on pcb.
+ * It converts a stereo (to chan. mixed to mono) signal to light animation
+ * Using digital filters or any alogrithm you prefer to convert music into ligth
+ * It controlls 3 RGB LED stripes powerlines with 74HC595 shift
+ * register.
+ * 
+ * Project:         DiscoTech
+ * HDK/ SDK Eng:    Tobias Wulf
+ * Date:            21.09.2013
+ *
+ */
+ 
+#include "mbed.h"
+#include "Terminal.h"
+
+#include "adc.h"
+#include "PwmDAC.h"
+#include "ShiftReg.h"
+
+#include "stdlib.h"
+
+#define SAMPLE_RATE 48000 //Hz
+#define ADC_BIAS 1.65 //Volts
+#define ULSB 3.3 / 4095
+#define RESOLUTION 256
+
+#define MASK 0x07 // for shift register
+
+/* declair your functions
+ * isr routine doesn't have to be declaired
+ */
+void mainInit();
+
+
+PwmDAC rgb;
+ADC adc(SAMPLE_RATE, 1);
+//AnalogOut dac(p18);
+ShiftReg LEDstripes(p30, p29, p28);
+
+/* Serial communication via usb uplink to pc
+ * to display what ever you want in the terminal
+ * or to send what ever you want from the terminal
+ */
+Terminal usbPC(USBTX, USBRX);
+
+/* array for updating the PwmDAC object
+ * and pointers for easy work
+ * we use steps 1 3 5 ...point'em
+ */
+double channels[6];
+
+/*
+uint32_t *redChan;
+uint32_t *greenChan;
+uint32_t *blueChan;
+*/
+
+/* global variables to work in the adc interrupt
+ * service routine to get the data from interrupt
+ */
+
+unsigned int pattern = 0;
+double newSample;
+
+bool adcActive = true;
+
+
+
+int main() {
+    
+    // LP for output pwm channel 1
+    double b1[3] = {0.207481, 0.414962, 0.207481}; 
+    double a1[2] = {-0.170076, 0.542269}; 
+    double w1[3] = {0.0, 0.0, 0.0};
+    double y1 = 0.0;
+
+    // HP for output pwm channel 3
+    double b3[3] = {0.365315, 0.730629, 0.365315}; 
+    double a3[2] = {-0.417651, 0.043608}; 
+    double w3[3] = {0.0, 0.0, 0.0};
+    double y3 = 0.0;
+
+    //BP - HP for output to LP
+    double b5i[3] = { 1.0, -1.9884555305478397,  1.0000000000000022}; 
+    double a5i[2] = {-1.9906581470004894,   0.99457555239826922}; 
+    double w5i[3] = {0.0, 0.0, 0.0};
+    double y5i = 0.0;
+
+    // BP - LP for output pwm channel 5
+    double b5j[3] = {1.0, -1.9988801446006126, 1.0}; 
+    double a5j[2] = {-1.991742261264652, 0.99502978931485908}; 
+    double w5j[3] = {0.0, 0.0, 0.0};
+    double y5j = 0.0;
+    
+    //int counter = 0;
+    
+    usbPC.printf("...start program\n");
+    wait(0.2);
+
+    mainInit();
+    usbPC.printf("...init completed\n");
+    wait(0.2);
+    
+    //srand(7);
+    
+    adcActive = false;
+        
+    while(1) {
+        if(adcActive) {
+            adcActive = false;
+            
+            // first LP, chan 1 (red)
+            w1[0] = newSample + (a1[0] * w1[1]) + (a1[1] * w1[2]);
+            y1 = (b1[0] * w1[0]) +(b1[1] * w1[1]) + (b1[2] * w1[2]);
+            w1[2] = w1[1]; 
+            w1[1] = w1[0];
+            channels[1] = (double) ((y1 + ADC_BIAS) * 100 / 3.3);
+            
+            // first HP, chan 3 (green)
+            w3[0] = newSample + (a3[0] * w3[1]) + (a3[1] * w3[2]);
+            y3 = (b3[0] * w3[0]) +(b3[1] * w3[1]) + (b3[2] * w3[2]);
+            w3[2] = w3[1]; 
+            w3[1] = w3[0];
+            channels[3] = (double) ((y3 + ADC_BIAS) * 100 / 3.3);
+            
+            // first BP - HP, target BP - LP
+            w5i[0] = 0.0099616678552018837 * newSample + (a5i[0] * w5i[1]) + (a5i[1] * w5i[2]);
+            y5i = (b5i[0] * w5i[0]) +(b5i[1] * w5i[1]) + (b5i[2] * w5i[2]);
+            w5i[2] = w5i[1]; 
+            w5i[1] = w5i[0];
+            
+            // first BP LP, chan 5 (blue)
+            w5j[0] = y5i + (a5j[0] * w5j[1]) + (a5j[1] * w5j[2]);
+            y5j = (b5j[0] * w5j[0]) +(b5j[1] * w5j[1]) + (b5j[2] * w5j[2]);
+            w5j[2] = w5j[1]; 
+            w5j[1] = w5j[0];
+            channels[5] = (double) ((y5j + ADC_BIAS) * 100 / 3.3);
+                      
+            rgb.updateDuty(channels);    
+        }
+
+        usbPC.printf("Sample = %f\n", newSample);
+        usbPC.printf("Chan1 = %f\n", channels[1]);
+        usbPC.printf("Chan3 = %f\n", channels[3]);
+        usbPC.printf("Chan5 = %f\n", channels[5]);
+
+        LEDstripes.ShiftByte(pattern, ShiftReg::MSBFirst);
+        LEDstripes.Latch();
+        LEDstripes.ShiftByte((unsigned int) MASK, ShiftReg::MSBFirst);
+        LEDstripes.Latch();     
+        
+        
+    }
+}/* end main */
+
+
+
+
+
+
+
+
+
+/* interrupt service routine from adc object
+ * here should be done the data processing
+ * variable and output updates
+ */
+void getADC(int chan, uint32_t value) {
+    adcActive = true;
+    newSample = (double) adc.read(p15);
+    newSample = newSample * ULSB - ADC_BIAS;
+    
+    // maybe do something other, but do it fast!
+}        
+
+/* function to initialize the main program, objects and 
+ * implement all variables
+ */
+void mainInit() {
+       
+    for(int i=0; i<6; i++) {
+        channels[i] = 0;
+    }
+        
+
+    usbPC.printf("...variables implemented\n");
+    wait(0.2);
+    
+    /* setup shift register (stripe power)
+     */
+     LEDstripes.ShiftByte((unsigned int) MASK, ShiftReg::MSBFirst);
+     LEDstripes.Latch();
+     wait(0.2);
+    
+    usbPC.printf("...shift register initialized\n");
+    wait(0.2);
+    
+    /* setup adc input
+     */
+    adc.append(getADC);
+    
+    adc.startmode(0,0);
+    adc.burst(1);
+   
+    adc.setup(p15,1);
+    adc.setup(p16,0);
+    adc.setup(p17,0);
+    adc.setup(p18,0);
+    adc.setup(p19,0);
+    adc.setup(p20,0);
+   
+    adc.interrupt_state(p15,1);
+    
+    
+    usbPC.printf("%u, %u, %u, %u\n", adc.setup(p15), 
+                                     adc.burst(),
+                                     adc.interrupt_state(p15), 
+                                     adc.actual_sample_rate());   
+    
+    usbPC.printf("...ADC initialized\n");
+    wait(0.2);
+    
+    /* setup pwm output
+     */
+    rgb.init();
+    rgb.deactivate(0);
+    rgb.deactivate(2);
+    rgb.deactivate(4);
+    rgb.setResolution(RESOLUTION);
+    rgb.start();
+    
+    usbPC.printf("...PWM output initialized\n");
+    wait(0.2);
+}
\ No newline at end of file
diff -r 000000000000 -r 59f7c34059ec mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Sep 23 11:21:28 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/b3110cd2dd17
\ No newline at end of file