From 526d5b3d4f0d6356baec290a9e9ce1fb945ebe6a Mon Sep 17 00:00:00 2001
From: hackbard <hackbard>
Date: Mon, 15 Jan 2007 23:32:17 +0000
Subject: [PATCH] somehow t1_overflow is not executed properly ...

---
 thermo/thermo.asm | 169 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 129 insertions(+), 40 deletions(-)

diff --git a/thermo/thermo.asm b/thermo/thermo.asm
index a66a491..3794546 100644
--- a/thermo/thermo.asm
+++ b/thermo/thermo.asm
@@ -21,13 +21,13 @@ reti
 reti
 
 ; T1 CAPT1
-rjmp T1_CAPTURE
+reti
 
 ; T1 COMP A
 reti
 
 ; T1 OVF1
-reti
+rjmp T1_OVERFLOW
 
 ; T0 OVF0
 reti
@@ -42,7 +42,7 @@ reti
 reti
 
 ; ANA COMP
-reti
+rjmp ANA_COMP
 
 ; PCINT
 reti
@@ -85,60 +85,147 @@ INIT:
 	; uart init
 	UART_INIT:
 
-		ldi r16,51 ; 9600 bps @ 8mhz
+		ldi r16,51 ; 9k6 bps @ 8mhz
 		out UBRRL, r16
 		out UBRRH, r0
 
-		ldi r16,(1<<UCSZ0)|(1<<UCSZ1) ; 8 data bits, no parity, 1 stop bit
+		ldi r16,(1<<UCSZ0)|(1<<UCSZ1) ; 8n1
 		out UCSRC,r16;
 
 		sbi UCSRB,TXEN ; enable tx
 
 	; timer init
-	TIME_INIT:
+	TIMER_INIT:
 
-		ldi r16,(1<<CS10)|(1<<CS11) ; prescaler 1/64
+		; prescaler 64
+		ldi r16,(1<<CS10)|(1<<CS11)
 		out TCCR1B,r16
 
-		ldi r16,(1<<ICIE1) ; enable input capture interrupt
-		out TIMSK,r16
-
 	; analog comparator init
 	ANA_COMP_INIT:
 
-		; interrupt if voltage is higher, enable input capture function ot tc1
-		ldi r16,(1<<ACIS0)|(1<<ACIS0)|(1<<ACIC) ; (no analog comp interrupt!)
+		; interrupt if voltage is higher
+		; enable input capture function ot tc1
+		ldi r16,(1<<ACIS0)|(1<<ACIS1)
 		out ACSR,r16
 
 	; output for rc element
-	ldi r17,(1<<DDB2)
-	out DDRB,r17
-	out PORTB,r0
+	RC_PIN_INIT:
+		sbi DDRD,DDD2 ; pin 2 port d is output
 
-	sei ; global interrupt enable
 
 MAIN:
+
+	; print 'S'tart symbol via uart
+	ldi r17,0x53
+	sbis UCSRA,UDRE
 	rjmp MAIN
+	out UDR,r17
+
+	; decharge rc pin
+	cbi PORTD,PORTD2
+
+	; reset timer counter 1 and enable overflow interrupt
+	out TCNT1H,r0
+	out TCNT1L,r0
+	ldi r17,(1<<TOIE1)	
+	out TIMSK,r17
+
+	; global interrupt enable
+	sei
+
+	; loop forever
+	MAIN_LOOP:
+
+		ldi r21,0
+		WLOOP1:
+			ldi r22,0
+			WLOOP2:
+				inc r22
+				cpi r22,0xff
+				brne WLOOP2
+			inc r21
+			cpi r21,0xff
+			brne WLOOP1
+
+		; tell the world 
+
+		; separate with a space
+		ldi r17,0x20
+		SPACE1:
+			sbis UCSRA,UDRE
+			rjmp SPACE1
+			out UDR,r17
+
+		; aco status
+		ldi r17,0x30
+		sbic ACSR,ACO
+		ldi r17,0x31
+		ACO_STAT:
+			sbis UCSRA,UDRE
+			rjmp ACO_STAT
+			out UDR,r17
+
+		; aci status
+		ldi r17,0x30
+		sbic ACSR,ACIE
+		ldi r17,0x31
+		ACI_STAT:
+			sbis UCSRA,UDRE
+			rjmp ACI_STAT
+			out UDR,r17
+
+		; pin status
+		ldi r17,0x30
+		sbic PORTD,PORTD2
+		ldi r17,0x31
+		PIN_STAT:
+			sbis UCSRA,UDRE
+			rjmp PIN_STAT
+			out UDR,r17
+
+		; ti status
+		ldi r17,0x30
+		in r23,TIMSK
+		sbrc r23,TOIE1
+		ldi r17,0x31
+		TI_STAT:
+			sbis UCSRA,UDRE
+			rjmp TI_STAT
+			out UDR,r17
+
+		; a space again for separation
+		ldi r17,0x20
+		SPACE2:
+			sbis UCSRA,UDRE
+			rjmp SPACE2
+			out UDR,r17
+		
+		; loop
+		rjmp MAIN_LOOP
 
 ;
-; timer 1 input capture interrupt routine
+; analog comparator interrupt routine
 ;
 
-T1_CAPTURE:
+ANA_COMP:
 
-	; disable input capture interrupt
-	in r17,TIMSK
-	cbr r17,ICIE1
-	out TIMSK,r17
-
-	; pull low the rc element
-	cbi PORTB,PORTB2
+	; immediately disable the analog comparator interrupt
+	cbi ACSR,ACIE
 
 	; read the captured value
-	in r19,ICR1L
-	in r18,ICR1H
+	in r19,TCNT1L
+	in r18,TCNT1H
+
+	; pull low the rc element
+	cbi PORTD,PORTD2
 
 	; uart out
+	ANA_COMP_SEND:
+		ldi r17,0x61
+		sbis UCSRA,UDRE
+		rjmp ANA_COMP_SEND
+		out UDR,r17
 	LOOP_ONE:
 		sbis UCSRA,UDRE
 		rjmp LOOP_ONE
@@ -148,6 +235,10 @@ T1_CAPTURE:
 		rjmp LOOP_TWO
 		out UDR,r19
 
+	; reset timer counter
+	out TCNT1H,r0
+	out TCNT1L,r0
+
 	; enable timer 1 overflow interrupt
 	in r17,TIMSK
 	sbr r17,TOIE1
@@ -161,29 +252,27 @@ T1_CAPTURE:
 
 T1_OVERFLOW:
 
-	; disable timer 1 overflow interrupt
-	in r17,TOIE1
-	cbr r17,TOIE1
+	; immediately disable timer 1 overflow interrupt
+	in r17,TIMSK
+	cbr r17,(1<<TOIE1)
 	out TIMSK,r17
 
-	; uart space out
-	ldi r17,0x20
-	LOOP_THREE:
+	; uart debug out
+	ldi r17,0x4f
+	OVF_SEND:
 		sbis UCSRA,UDRE
-		rjmp LOOP_TWO
+		rjmp OVF_SEND
 		out UDR,r17
 
 	; reset timer counter
 	out TCNT1H,r0
 	out TCNT1L,r0
 
-	; pull rc element high
-	sbi PORTB,PORTB2
+	; enable analog comparator interrupt
+	sbi ACSR,ACIE
 
-	; enable input capture interrupt
-	in r17,TIMSK
-	sbr r17,ICIE1
-	out TIMSK,r17
+	; pull rc element high
+	sbi PORTD,PORTD2
 
 	reti
 
-- 
2.20.1