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projects:spectrumanaliser:step2_software [2012/05/06 15:40] elger |
projects:spectrumanaliser:step2_software [2016/11/16 13:06] |
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| - | ====== Spectrumanaliser Software ====== | ||
| - | The software for my [[projects:spectrumanaliser|spectrumanaliser project]] is not finished, and it may never be finished because there is always some feature or improvement to make. | ||
| - | However, I do have a working piece of example code which basically functions. Here it is: | ||
| - | |||
| - | <code c> | ||
| - | #include <fix_fft.h> | ||
| - | #include <ht1632c.h> | ||
| - | |||
| - | |||
| - | char im[128], data[128], raw[128], maxval[64]; | ||
| - | char x=64, ylim=16; | ||
| - | int i=0, val; | ||
| - | static long tt=0; | ||
| - | |||
| - | ht1632c ledMatrix = ht1632c(&PORTB, 10, 9, 11, 8, GEOM_32x16, 2); | ||
| - | |||
| - | void setup() | ||
| - | { | ||
| - | |||
| - | ledMatrix.clear(); | ||
| - | ledMatrix.pwm(15); | ||
| - | ledMatrix.plot(0, 0, 2); | ||
| - | |||
| - | analogReference(DEFAULT); // Use default (5v) aref voltage. | ||
| - | for (int z=0; z<64; z++) { | ||
| - | maxval[z]=15; | ||
| - | }; // fill the lastpass[] array with dummy data | ||
| - | |||
| - | // defines for setting and clearing register bits | ||
| - | #ifndef cbi | ||
| - | #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit)) | ||
| - | #endif | ||
| - | #ifndef sbi | ||
| - | #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit)) | ||
| - | #endif | ||
| - | |||
| - | // set prescale to 16 | ||
| - | sbi(ADCSRA,ADPS2) ; | ||
| - | cbi(ADCSRA,ADPS1) ; | ||
| - | cbi(ADCSRA,ADPS0) ; | ||
| - | |||
| - | }; | ||
| - | |||
| - | void loop() | ||
| - | { | ||
| - | |||
| - | //if (millis() > tt ) | ||
| - | { | ||
| - | | ||
| - | //noInterrupts(); | ||
| - | if (i < 128) { | ||
| - | val = analogRead(1); | ||
| - | //val = ((log(analogRead(1))*1024)/log(1024)); | ||
| - | data[i] = val - 512; | ||
| - | im[i] = 0; | ||
| - | i++; | ||
| - | } | ||
| - | else { | ||
| - | //interrupts(); | ||
| - | //this could be done with the fix_fftr function without the im array. | ||
| - | //fft_windowing(data,7); | ||
| - | fix_fft(data,im,7,0); | ||
| - | // I am only interessted in the absolute value of the transformation | ||
| - | | ||
| - | bool degrade = (millis() - tt > 100); | ||
| - | if ( degrade ) { | ||
| - | tt = millis(); | ||
| - | } | ||
| - | for (i=0; i< 64;i++){ | ||
| - | data[i] = sqrt(data[i] * data[i] + im[i] * im[i]); | ||
| - | int y = constrain( map(data[i], 0, 15, 15, 0) , 0, 15) ; | ||
| - | // int y = constrain( map( (log( data[i]+1) * 15/log(15)), 0, 15, 15 , 0 ) , 0, 15) ; | ||
| - | |||
| - | ledMatrix.line(i, 0 , i, 15, 0); | ||
| - | ledMatrix.line(i, y , i, 15, 1); | ||
| - | ledMatrix.plot(i, y, 3); | ||
| - | maxval[i] = min(maxval[i], y); | ||
| - | ledMatrix.plot(i, maxval[i], 2); | ||
| - | if ( degrade ) { | ||
| - | //maxval[i] = constrain(maxval[i] +1, 0, 15) ; | ||
| - | maxval[i] = maxval[i] + 1 ; | ||
| - | } | ||
| - | } | ||
| - | i = 0; | ||
| - | | ||
| - | | ||
| - | ledMatrix.sendframe(); | ||
| - | } | ||
| - | |||
| - | } | ||
| - | | ||
| - | |||
| - | }; | ||
| - | |||
| - | </code> | ||