Arduino sketch - Chip Kit issues Real time audio Loopback

Created Mon, 12 Nov 2012 18:13:17 +0000 by krsstyles

krsstyles

Mon, 12 Nov 2012 18:13:17 +0000

Hi, all new to this site and the whole micro-controller.

I'm having a few issues compiling Arduino code for the chipkit 32 I get these error codes

arduino_fast_ADC_001.cpp: In function 'void setup()': arduino_fast_ADC_001.cpp:66:3: error: 'ADCSRA' was not declared in this scope arduino_fast_ADC_001.cpp:66:3: error: '_SFR_BYTE' was not declared in this scope arduino_fast_ADC_001.cpp:66:3: error: 'ADPS2' was not declared in this scope arduino_fast_ADC_001.cpp:67:3: error: 'ADPS1' was not declared in this scope arduino_fast_ADC_001.cpp:68:3: error: 'ADPS0' was not declared in this scope arduino_fast_ADC_001.cpp:73:3: error: 'ADMUX' was not declared in this scope arduino_fast_ADC_001.cpp:73:3: error: 'ADLAR' was not declared in this scope arduino_fast_ADC_001.cpp:74:3: error: 'REFS0' was not declared in this scope arduino_fast_ADC_001.cpp:75:3: error: 'REFS1' was not declared in this scope arduino_fast_ADC_001.cpp:76:3: error: 'MUX0' was not declared in this scope arduino_fast_ADC_001.cpp:77:3: error: 'MUX1' was not declared in this scope arduino_fast_ADC_001.cpp:78:3: error: 'MUX2' was not declared in this scope arduino_fast_ADC_001.cpp:79:3: error: 'MUX3' was not declared in this scope arduino_fast_ADC_001.cpp:83:3: error: 'TCCR2A' was not declared in this scope arduino_fast_ADC_001.cpp:83:3: error: 'COM2A0' was not declared in this scope arduino_fast_ADC_001.cpp:84:3: error: 'COM2A1' was not declared in this scope arduino_fast_ADC_001.cpp:85:3: error: 'WGM20' was not declared in this scope arduino_fast_ADC_001.cpp:86:3: error: 'WGM21' was not declared in this scope arduino_fast_ADC_001.cpp:88:3: error: 'TCCR2B' was not declared in this scope arduino_fast_ADC_001.cpp:88:3: error: 'WGM22' was not declared in this scope arduino_fast_ADC_001.cpp:94:3: error: 'CS20' was not declared in this scope arduino_fast_ADC_001.cpp:95:3: error: 'CS21' was not declared in this scope arduino_fast_ADC_001.cpp:96:3: error: 'CS22' was not declared in this scope arduino_fast_ADC_001.cpp:99:3: error: 'DDRB' was not declared in this scope arduino_fast_ADC_001.cpp:102:3: error: 'TIMSK0' was not declared in this scope arduino_fast_ADC_001.cpp:102:3: error: 'TOIE0' was not declared in this scope arduino_fast_ADC_001.cpp:103:3: error: 'TIMSK2' was not declared in this scope arduino_fast_ADC_001.cpp:103:3: error: 'TOIE2' was not declared in this scope arduino_fast_ADC_001.cpp: In function 'void loop()': arduino_fast_ADC_001.cpp:127:3: error: 'OCR2A' was not declared in this scope arduino_fast_ADC_001.cpp: At global scope: arduino_fast_ADC_001.cpp:153:4: error: expected constructor, destructor, or type conversion before '(' token

Arduino Code

/* Arduino Audio Loopback Test *

• Arduino Realtime Audio Processing

• 2 ADC 8-Bit Mode

• ana�og input 1 is used to sample the audio signal

• analog input 0 is used to control an audio effect

• PWM DAC with Timer2 as analog output

• KHM 2008 / Lab3/ Martin Nawrath nawrath@khm.de

• Kunsthochschule fuer Medien Koeln

• Academy of Media Arts Cologne

• Arduino fast ADC - modified by Pawel Dziadur

*/

#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit)) #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))

int ledPin = 13; // LED connected to digital pin 13 int testPin = 7;

boolean div32; boolean div16; // interrupt variables accessed globally volatile boolean f_sample; volatile byte badc0; volatile byte badc1; volatile byte ibb;

int cnta; int icnt;

int cnt2; int iw1;

int iw; byte bb;

byte dd[512]; // Audio Memory Array 8-Bit //byte buf[2048];

void setup() { pinMode(ledPin, OUTPUT); // sets the digital pin as output pinMode(testPin, OUTPUT); Serial.begin(57600); // connect to the serial port //Serial.println("Arduino Audio Reverb");

fill_sinewave(); // reload wave after 1 second

// set adc prescaler to 64 for 19kHz sampling frequency cbi(ADCSRA, ADPS2); sbi(ADCSRA, ADPS1); sbi(ADCSRA, ADPS0);

sbi(ADMUX,ADLAR); // 8-Bit ADC in ADCH Register sbi(ADMUX,REFS0); // VCC Reference cbi(ADMUX,REFS1); cbi(ADMUX,MUX0); // Set Input Multiplexer to Channel 0 cbi(ADMUX,MUX1); cbi(ADMUX,MUX2); cbi(ADMUX,MUX3);

// Timer2 PWM Mode set to fast PWM cbi (TCCR2A, COM2A0); sbi (TCCR2A, COM2A1); sbi (TCCR2A, WGM20); sbi (TCCR2A, WGM21);

cbi (TCCR2B, WGM22);

// Timer2 Clock Prescaler to : 1 sbi (TCCR2B, CS20); cbi (TCCR2B, CS21); cbi (TCCR2B, CS22);

// Timer2 PWM Port Enable sbi(DDRB,3); // set digital pin 11 to output

//cli(); // disable interrupts to avoid distortion cbi (TIMSK0,TOIE0); // disable Timer0 !!! delay is off now sbi (TIMSK2,TOIE2); // enable Timer2 Interrupt

//Serial.print("ADC offset="); // trim to 127 iw1=badc1;
// Serial.println(iw1); }

void loop() { while (!f_sample) { // wait for Sample Value from ADC } // Cycle 15625 KHz = 64uSec

PORTD = PORTD | 128; // Test Output on pin 7 f_sample=false;

iw1 = 127 - badc1; // substract offset from new sample if (iw1 < -127) iw1=-127; // Audio limiter if (iw1 > 127) iw1=127; // Audio limiter

bb= 127+iw1;

OCR2A=bb; // Sample Value to PWM Output Serial.write(bb); // Send to serial port as byte PORTD = PORTD ^ 128; // Test Output on pin 7

} // loop //****************************************************************** void fill_sinewave(){ float pi = 3.141592; float dx ; float fd ; float fcnt; dx=2 * pi / 512; // fill the 512 byte bufferarry for (iw = 0; iw <= 511; iw++){ // with 50 periods sinewawe fd= 127*sin(fcnt); // fundamental tone fcnt=fcnt+dx; // in the range of 0 to 2xpi and 1/512 increments bb=127+fd; // add dc offset to sinewawe dd[iw]=bb; // write value into array

} }

//****************************************************************** // Timer2 Interrupt Service at 62.5 KHz // here the audio and pot signal is sampled in a rate of: 16Mhz / 256 / 2 / 2 = 15625 Hz // runtime : xxxx microseconds ISR(TIMER2_OVF_vect) {

PORTB = PORTB | 1 ;

div32=!div32; // divide timer2 frequency / 2 to 31.25kHz if (div32) else ibb++; ibb--; ibb++; ibb--; // short delay before start conversion sbi(ADCSRA,ADSC); // start next conversion }

}

I hope some one can take small bit of time to help.

Thanks alot Krsstyles

mkirby

Tue, 18 Dec 2012 20:58:22 +0000

This code will not work on a chipKIT board because it has a TON of Atmel dependent code. Much of the code in this software talks directly to the hardware registers. This will not work on a chipKIT board because they utilize PIC32 microcontrollers instead of Atmel microcontrollers, so the r/w from/to hardware registers are not cross compatible. More than likely PIC32 chips have very similar registers, but their naming scheme and actual register layout is going to be very different.

~MKirby