filter implement on DiscoTech device

Dependencies:   PwmDAC ShiftReg Terminal adc mbed

Files at this revision

API Documentation at this revision

Comitter:
XIZ
Date:
Wed Sep 25 14:03:21 2013 +0000
Commit message:
Filter implement on DiscoTech device

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 b2736cb133e0 PwmDAC.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PwmDAC.lib	Wed Sep 25 14:03:21 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/flash_ahaa/code/PwmDAC/#381bd99d10a4
diff -r 000000000000 -r b2736cb133e0 ShiftReg.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ShiftReg.lib	Wed Sep 25 14:03:21 2013 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/yoonghm/code/ShiftReg/#a0e3fd47970f
diff -r 000000000000 -r b2736cb133e0 Terminal.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Terminal.lib	Wed Sep 25 14:03:21 2013 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/simon/code/Terminal/#85184c13476c
diff -r 000000000000 -r b2736cb133e0 adc.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/adc.lib	Wed Sep 25 14:03:21 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/flash_ahaa/code/adc/#b05e4f5e2c8c
diff -r 000000000000 -r b2736cb133e0 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Sep 25 14:03:21 2013 +0000
@@ -0,0 +1,223 @@
+/* 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"
+
+
+#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
+
+
+#define NUMBER_OF_SAMPLES 1024
+
+/* 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
+ */
+uint32_t channels[6];
+
+
+
+/* global variables to work in the adc interrupt
+ * service routine to get the data from interrupt
+ */
+
+unsigned int pattern;
+double newSample;
+
+
+bool save;
+
+double adcSavings[NUMBER_OF_SAMPLES];
+double adcSamples[NUMBER_OF_SAMPLES];
+
+
+
+    double adcSample;
+    // LP for output pwm channel 1
+    const double b1[3] = {0.034566506326168603, 0.069133012652337206, 0.034566506326168603}; 
+    const double a1[2] = { -1.5156844350566925,  0.65395046036136695}; 
+    double w1[3];
+    double y1;
+
+
+int main() {
+
+ 
+        // init for saving samples and filter results
+        for (int i = 0; i < NUMBER_OF_SAMPLES; i++){
+        adcSavings[i] = 0.0f;  
+        adcSamples[i] = 0.0f;
+        }
+    
+
+    // LP for output pwm channel 1
+    for(int i= 0; i<3;i++)
+        w1[i] = 0.0f;
+    y1 = 0.0f;
+
+
+ 
+    
+    usbPC.printf("...start program\n");
+    wait(0.2);
+
+    mainInit();
+    usbPC.printf("...init completed\n");
+    wait(0.2);
+
+ 
+    while(1) {
+        
+        if(save == false) {
+        
+           usbPC.locate(0,0);
+           usbPC.cls();
+           
+           
+           for(int i=0; i<NUMBER_OF_SAMPLES; i++)
+                usbPC.printf("%1.4f %1.4f\n",adcSavings[i],adcSamples[i]);
+        }
+        
+        if(save == false) break;
+        
+    }        
+
+}/* 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) {
+    static int cycleCounter = 0;
+    
+    adcSample = (double) adc.read(p15);
+    adcSample = adcSample * ULSB;
+              // first LP, chan 1 (red)
+            w1[0] = adcSample - (a1[0] * w1[1]) - (a1[1] * w1[2]);
+            y1 = 0.89125093813374 * ((b1[0] * w1[0]) +(b1[1] * w1[1]) + (b1[2] * w1[2]));
+            w1[2] = w1[1]; 
+            w1[1] = w1[0];
+       
+     if(cycleCounter < NUMBER_OF_SAMPLES) {
+       adcSavings[cycleCounter] = y1;
+       adcSamples[cycleCounter] = adcSample;
+       cycleCounter++;
+       if((cycleCounter == NUMBER_OF_SAMPLES-1) && save) {
+            save = false;
+            cycleCounter = 0;
+       }
+    }          
+ 
+}         
+
+/* 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);
+    
+    wait(0.2);
+    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 b2736cb133e0 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Sep 25 14:03:21 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f
\ No newline at end of file