corecture F_CPU and osccal, there seems to be a bug only when connected to the pc but not to the wall adapter

main.c

@@ -48,15 +48,14 @@ else msec=0;
 int main (void)
 {
 		int i,i2;
-		int colorb;
-		int colora;
+		//int colorb;
+		//int colora;
 		int sum,avg;
 		char sample[64];
 		char im[64];
 		char buff[64];
-		char temp;
 
-		float fac_r=0.5;
+		float fac_r=0;
 		float fac_g=0.5;
 		float fac_b=1;
 		msec=0;
@@ -65,7 +64,7 @@ int main (void)
 		setupADC();
 		setupTimer();
 
-		OSCCAL = 250;//overclock!!! to 30MHz
+		//OSCCAL = 250;//overclock!!! to 30MHz
 		for(i=0;i<8;i++)
 		{
 				led_bar1[i].r=0;