1 files changed, 68 insertions, 0 deletions

diff --git a/arduino/fht_test.ino b/arduino/fht_test.ino
new file mode 100644
index 0000000..0e2f83c
--- /dev/null
+++ b/arduino/fht_test.ino
@@ -0,0 +1,68 @@
+
+// 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);
+}
+