From f1690c6cd15ee8de7297bbaba72781599ae812c9 Mon Sep 17 00:00:00 2001
From: bigalex <bigalex@gmx.de>
Date: Fri, 5 Oct 2012 22:43:38 +0200
Subject: [PATCH] now detecting sound

---
 firmware/lib/bughal.c | 18 ++++++++++++------
 firmware/main.c       | 43 ++++++++++++++++++++++++++++++++++---------
 2 files changed, 46 insertions(+), 15 deletions(-)

diff --git a/firmware/lib/bughal.c b/firmware/lib/bughal.c
index ed6309e..a959499 100644
--- a/firmware/lib/bughal.c
+++ b/firmware/lib/bughal.c
@@ -58,12 +58,18 @@ void init_buzzr(void){
 
 
 void init_mic(void){
-	//its on B2 and C5, for reasons
-	// 
-	DDRC |= (1 << PORTC5);
-	DDRB |= (1 << PORTB2);
-	//switch it off
-	buzzr_off();
+	//buzzer is on B2 and C5, for reasons
+	// we use it as a mic
+  	DDRC &= ~(1 << PORTC5); //switch C5 to input
+	DDRB |= (1 << PORTB2);  //B2 as output
+	PORTB &= ~(1 << PORTB2);//and to GND	
+	ADMUX = (1<<REFS1) | (1<<REFS0); //use internal 1.1V as reference
+  	ADCSRA = (1<<ADPS1) | (1<<ADPS0);// prescaler F_CPU/8
+        ADCSRA |= (1<<ADEN);             // ADC enable - turn it on
+        // do one conversion
+        ADCSRA |= (1<<ADSC);  
+  	while (ADCSRA & (1<<ADSC) ) {} //wait for conversion to end
+	uint16_t dummy = ADCW; //read once 
 	return;
 }
 
diff --git a/firmware/main.c b/firmware/main.c
index bdca4c8..1517851 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -44,26 +44,51 @@ void modeswitch_poll(void){
 void do_mode0(void){
  static timer_t mytimer;
  static uint16_t maxval;
+ uint16_t curval;
+
    if (ModeChanged){
      timer_set(&mytimer, 10);
      maxval=0;
-    ModeChanged = false;
-     buzzr_up();
+     ModeChanged = false;
+     init_mic();
+     maxval=0;
    };
    if(timer_expired(&mytimer)){
-     //USART0_put_uint16(maxval);
-     //USART0_crlf();
-     timer_set(&mytimer, 10);
+     USART0_put_uint16(maxval);
+     USART0_crlf();
+     timer_set(&mytimer, 1);
+     if (maxval>0) {led_on(LED_R|LED_L);} else {led_off(LED_R|LED_L);};
      maxval=0;
-     buzzr_inv();
-   }; //end if timer_expired  
-    maxval++;
 
-   
+
+   }; //end if timer_expired  
+
+  // single measurement
+  ADMUX = (ADMUX & ~(0x1F)) | 5; // select channel 5
+  ADCSRA |= (1<<ADSC);            // start single conversion
+  while (ADCSRA & (1<<ADSC) ) {}; // wait for conversion to end
+  curval =ADCW;                   // read result
+  maxval = (curval>maxval) ? curval : maxval;
+
 
 }; //end do_mode0
 
 
+
+
+
+
+  
+ 
+
+
+
+
+
+
+
+
+
 void do_mode1(void){
   static uint16_t tone;
   if (ModeChanged){