From 435321341893d026b0b2b194df52d79891c4528a Mon Sep 17 00:00:00 2001
From: hackbard <hackbard>
Date: Wed, 25 Oct 2006 20:40:05 +0000
Subject: [PATCH] /* no comment */

---
 beginners/light_control.asm | 99 +++++++++++++++++++++++++++----------
 beginners/s90_to_tiny.inc   | 14 ++++--
 2 files changed, 81 insertions(+), 32 deletions(-)

diff --git a/beginners/light_control.asm b/beginners/light_control.asm
index 432ca7d..2c70736 100644
--- a/beginners/light_control.asm
+++ b/beginners/light_control.asm
@@ -7,14 +7,17 @@
 ; specify device
 .include "../include/2313def.inc"
 
+; for register/bit definitions compatibility
+.include "./s90_to_tiny.inc"
+
 ; ------------------
 ; interrupt vectors:
 ; ------------------
 
 ; reset
-rjmp RESET
+rjmp INIT
 ; int0
-reti
+rjmp INT_ROUTINE
 ; int1
 reti
 ; timer 1 capture
@@ -54,47 +57,89 @@ reti
 ; code:
 ; -----
 
-RESET:
+INIT:
 	; set stackpointer
 	ldi r16,low(RAMEND)	; write top of ramend (lowbyte)
 	out SPL,r16		; to stackpointer
 
 	; rs232 init
-	ldi r16,12 	; "38.4k bps @ 8 mhz" in r16
-	out UBRR,r16 	; write to uart baudrate register
+	ldi r16,0
+	out UBRRH,r16
+	ldi r16,12 	; "38.4k bps @ 8 mhz" / "4.8k bps @ 1 mhz"
+	out UBRRL,r16 	; write to uart baudrate register
 	ldi r16,(1<<RXEN)|(1<<TXEN)|(1<<RXCIE)	; enable rx/tx + rx interrupt
 	out UCSRB,r16	; write to uart control register
 
-	; pwm (OC0A=PB2 OC0B=PD5)
-	; set as output
-	ldi r16,(1<<DDB2)
-	out DDRB,r16
-	ldi r16,(1<<DDD5)
+	; int0
+	ldi r16,(1<<PD2)	; int0 input
 	out DDRD,r16
-	; output 0
-	ldi r16,(1<<PINB2)
-	subi r16,0xff
-	out PORTB,r16
-	ldi r16,(1<<PIND5)|(1<<PIND6)
-	subi r16,0xff
+	ldi r16,(1<<PD2)	; int0 pull-up
 	out PORTD,r16
-	; toggle OC0A/B on compare match / fast pwm
-	ldi r16,(1<<COM0A0)|(1<<COM0B0)|(1<<WGM00)|(1<<WGM01)
-	out TCCR0A,r16
-	; top in OCR0A / no clock prescaling
-	ldi r16,(1<<WGM02)|(1<<CS00)
-	; overflow interrupt enable
-	
-	; initial pwm value 0x7f
-	ldi r16,0x7f
-	out OCR0A,r16
-	out OCR0B,r16
+	ldi r16,0		; interrupt on low level of int0
+	out MCUCR,r16
+	ldi r16,(1<<INT0) 	; ir enable
+	out GIMSK,r16
+
+	; port config
+	ldi r16,0		; output
+	out DDRB,r16
+	ldi r16,0xff		; pull high
+	out PORTB,r16
+
+	; some initial values
+	ldi r20,0
+	ldi r17,0xff
+	ldi r25,0x4c
 
 	; global interrupt enable
 	sei
 
 MAIN:
+	out PORTB,r17
+	
 	rjmp MAIN
 
+
 UART_RX:
+	in r29,UDR
+	UART_OUT:
+		sbis UCSRA,UDRE
+		rjmp UART_OUT
+		out UDR,r29
+	reti
+
+
+INT_ROUTINE:
+	ldi r16,0		; disable int0
+	out GIMSK,r16
+	cpi r17,0xff 		; toggle light
+	breq TURN_ON
+	TURN_OFF:
+		ldi r17,0xff	; turn off light
+		ldi r25,0x44	; D
+		rjmp CONTINUE
+	TURN_ON:
+		ldi r17,0	; turn on light
+		ldi r25,0x4c	; L
+	CONTINUE:
+		out PORTB,r17
+		sbis UCSRA,UDRE
+		rjmp CONTINUE
+		out UDR,r25
+	ldi r20,0
+	WAIT:
+		ldi r21,0
+		WAIT_II:
+			inc r21
+			cpi r21,0xff
+			brne WAIT_II
+		inc r20
+		cpi r20,0xff
+		brne WAIT
+
+	ldi r16,(1<<INT0) ; (re)activate int0
+	out GIMSK,r16
+
 	reti
+		
+; eof
diff --git a/beginners/s90_to_tiny.inc b/beginners/s90_to_tiny.inc
index 7900ada..f08715f 100644
--- a/beginners/s90_to_tiny.inc
+++ b/beginners/s90_to_tiny.inc
@@ -13,11 +13,13 @@
 
 ; uart
 ;#####
+.equ	UBRRL	=UBRR	; 09
+.equ	UBRRH	=$02
 .equ 	UCSRA	=USR	; 0b
 .equ	UCSRB	=UCR	; 0a
 
-; 8 bit timer counter register
-;#############################
+; 8/16 bit timer counter registers
+;#################################
 .equ	TCCR0A	=$30
 ;-------------------
 .equ	WGM00	=$00
@@ -42,7 +44,9 @@
 .equ 	OCR0B	=$3c
 ;-------------------
 
-
-
-
+; TIMSK
+;------
+.equ	OCIE0A	=$00
+.equ	OCIE0B	=$02
+.equ	OCIE1B	=$05
 
-- 
2.20.1