From b710fed79bcb3285a62a88cd626cf0e9f82d99cf Mon Sep 17 00:00:00 2001
From: Jonathan Wyss <j.wyss@kolabnow.ch>
Date: Wed, 28 Feb 2024 22:52:37 +0100
Subject: [PATCH] with fft

---
 main.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 70 insertions(+), 11 deletions(-)

diff --git a/main.c b/main.c
index d23b7d9..92fce69 100644
--- a/main.c
+++ b/main.c
@@ -8,13 +8,33 @@
 #include"light_ws2812_AVR/Light_WS2812/light_ws2812.h"
 
 
-#define STARTADC ADCSRA |= _BS(ADSC)
+#define STARTADC ADCSRA |= (1<<ADSC)
 #define PB_mic PB0
 
+//resolution fft calc: 
+//https://3roam.com/fft-resolution-bandwidth-calculator/
+//128 samples , 1kSPS  = 7.8Hz
+//interested in 0-10000 Hz
+// 
+//128 bins a 7.8hz = 0...1000Hz
+//
+//we have 8 leds:
+//bands 125hz/band -> 16 bins
+//
+//1-7.8 - ca 130hz
+//2-	255hz
+//3-	380
+//4-	505
+//5-	630
+//6-	755
+//7-	880
+//8-	1kHz
 int main (void)
 {
-		int i;
+		int i,i2;
 		int colorb;
+		int colora;
+		int avg;
 		char sample[128];
 		char im[128];
 		struct cRGB led_bar1[8];
@@ -27,19 +47,51 @@ int main (void)
 				led_bar1[i].b=0;
 		}
 
+
 		while(1)
 		{
 //######RECORD SAMPLES#######
 				for(i=0;i<128;i++)
-				{
-						sample[i] = ADCH; //read Analog value register 8bit
+				{	
+
+						STARTADC; 
+						sample[i] = (ADCH-128)*2; //read Analog value register 8bit center -128
 						im[i]=0;		//pseudo data for funciton
 				}
 				fix_fft(sample,im,7,0);//im[i] is always zero
+//####Averaging Data####
+//
+			   for(i2=0;i2<128;i2++)
+			   {
+
+						sample[i2] = sqrt(sample[i2] * sample[i2] + im[i2]* im[i2]);
+			   }
 
 				for(i=0;i<8;i++)
 				{
-						for(colorb=0;colorb<256;colorb++)
+						for(i2=1;i2<=16;i2++)
+						{
+						sample[i] = (sample[i] + sample[i*16+i2])/2;
+						}
+						//avg written to sample[0..7]
+						//contains values scaled to int boundarys
+						//scale them to 0..256
+						sample[i]= map(sample[i],0,30,0,255);
+						led_bar1[i].r=0;;led_bar1[i].b=0;
+						//if(sample[i]<2) sample[i]=2;
+						led_bar1[i].g=sample[i];
+		
+				}
+
+
+								
+				ws2812_setleds((uint8_t *)led_bar1,8);
+		}
+
+				//	_delay_ms(50);
+//				for(i=0;i<8;i++)
+//				{
+					/*	for(colorb=0;colorb<256;colorb++)
 						{
 						led_bar1[i].r=10;led_bar1[i].g=colorb;led_bar1[i].b=0;
 						ws2812_sendarray((uint8_t *)led_bar1,8*3);	
@@ -52,15 +104,22 @@ int main (void)
 						ws2812_sendarray((uint8_t *)led_bar1,8*3);	
 						_delay_ms(1);
 
-						}
-						led_bar1[0].r=0;led_bar1[0].g=100;led_bar1[0].b=10;
+						}*/
+						/*led_bar1[0].r=0;led_bar1[0].g=100;led_bar1[0].b=10;
 						ws2812_sendarray((uint8_t *)led_bar1,8*3);
-					_delay_ms(50);	
+						_delay_ms(50);	
 						led_bar1[0].r=255;led_bar1[0].g=0;led_bar1[0].b=10;
-						ws2812_sendarray((uint8_t *)led_bar1,8*3);	
+						ws2812_sendarray((uint8_t *)led_bar1,8*3);	*/
+
+						
+//				}
+
 
-				}
 
-		}
    return 0;                 
 }
+
+int map(int value, int old_min, int old_max,int new_min, int new_max)
+{
+		return (new_max/old_max*value);
+}