optimization

main.c

@@ -1,3 +1,4 @@
+#include<math.h>
 #include<util/delay.h>
 #include<avr/io.h>
 #include"fix_fft.h"
@@ -7,6 +8,7 @@
 #include"main.h"
 
 #define STARTADC ADCSRA |= (1<<ADSC)
+#define WAITADC ADCSRA & (1<<ADSC)
 #define PB_mic PB0
 #define NOISE 100
 #define SCALE_FACTOR 10
@@ -38,9 +40,9 @@ int main (void)
 		int colorb;
 		int colora;
 		int sum,avg;
-		char sample[64];
-		char im[64];
-		char buff[64];
+		static char sample[64];
+		static char im[64];
+		static char buff[64];
 		char temp;
 		msec=0;
 		struct cRGB led_bar1[8];
@@ -69,6 +71,7 @@ int main (void)
 				{	
 				msec=0;
 						STARTADC; 
+                        WAITADC;//as adc is slower than cpu
 						sample[i] = (ADCH-128); //read Analog value register 8bit center -128
 						//sample[i] = (sample[i] <= NOISE) ? 0 : (sample[i] - NOISE);						  //noise reduction
 						im[i]=0;		//pseudo data for funciton
@@ -121,14 +124,16 @@ int main (void)
 								led_bar1[i].b=sample[i]/2;
 						}
 				}				
+                cli();//disable interupts to prevent intereference
 				ws2812_setleds(led_bar1,8);
+                sei();//reenable interupts
 		}
 return 0;                 
 }
 
 int map(int value, int old_min, int old_max,int new_min, int new_max)
 {
-		return (new_max/old_max*value);
+        return (value - old_min) * (new_max - new_min) / (old_max - old_min) + new_min;
 }
 
 void setupTimer(void)