Revision 3:0df6485bc3ec, committed 2014-07-24

Comitter:

eencae

Date:

Thu Jul 24 15:25:26 2014 +0000

Parent:

2:8da22b498051

Commit message:

Simple code which samples audio on ADC, calculates FFT and displays spectrum on LCD display.

Changed in this revision

--- a/main.cpp	Tue Jul 22 17:52:59 2014 +0000
+++ b/main.cpp	Thu Jul 24 15:25:26 2014 +0000
@@ -25,7 +25,7 @@
 PwmOut blue(p25);
 
 #define BUF_LEN 1024
-#define SAMP_FREQ 30000
+#define SAMP_FREQ 10000
 
 short samples[BUF_LEN];  // store the values read from ADC
 short mx[BUF_LEN*2]; // input data 16 bit, 4 byte aligned  x0r,x0i,x1r,x1i,....
@@ -34,6 +34,8 @@
 
 char buffer[14];  // screen buffer
 
+int tone;
+
 int main()
 {
     // initialise LCD and display welcomes message
@@ -63,9 +65,7 @@
         rgbDance();
         //printSpectrum();
         //printSamples();
-        //int tone = calcPeakFrequency();  // calculate peak frequcny and send over serial for debug
-        //serial.printf("f = %u\n",tone);
-
+        tone = calcPeakFrequency();  // calculate peak frequcny and send over serial for debug
         wait_ms(10);  // update display 100 ms
 
     }
@@ -203,6 +203,9 @@
             lcd.setPixel(i,j);  // draw bar graphs for spectrum bins
         }
     }
+    
+    sprintf(buffer,"%4u Hz",tone);
+    lcd.printString(buffer,40,0); 
     lcd.refresh();
 
 }