Oliver Richter
filter implement on DiscoTech device
Dependencies: PwmDAC ShiftReg Terminal adc mbed
Revision 0:b2736cb133e0, committed 2013-09-25
- Comitter:
- XIZ
- Date:
- Wed Sep 25 14:03:21 2013 +0000
- Commit message:
- Filter implement on DiscoTech device
Changed in this revision
--- /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
--- /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
--- /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
--- /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
--- /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
--- /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