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// FHT Options
#define FHT_N 256
#define SCALE 256
#define WINDOW 1
#define REORDER 1
#define LOG_OUT 1
#define LIN_OUT 0
#define LIN_OUT8 0
#define OCTAVE 0
#define OCT_NORM 0
#define BINS 128
#include <FHT.h>
void aquire_data() {
noInterrupts();
for (int i = 0; i < FHT_N; i++) {
while(!(ADCSRA & 0x10)); // wait for adc to be ready
ADCSRA = 0xf5; // restart adc
byte m = ADCL; // fetch adc data
byte j = ADCH;
int k = (j << 8) | m; // form into an int
k -= 0x0200; // form into a signed int
k <<= 6; // form into a 16b signed int
fht_input[i] = k; // put real data into bins
}
interrupts();
}
void crunch_data() {
fht_window();
fht_reorder();
fht_run();
//fht_mag_octave();
fht_mag_log();
}
void setup() {
Serial.begin(115200);
TIMSK0 = 0; // turn off timer0 for lower jitter
ADCSRA = 0xe5; // set the adc to free running mode
ADMUX = 0x40; // use adc0
DIDR0 = 0x01; // turn off the digital input for adc0
}
char buf[2550] = "";
void loop() {
aquire_data();
crunch_data();
for (int i = 0; i < BINS; i++) {
Serial.print(fht_log_out[i]);
Serial.print(' ');
}
Serial.print('\n');
delay(10000);
}
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