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
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