;	Control 2-line LCD with AT90S2313 AVR RISC Processor

;	Using 4-wire interface

;

;	Charles R. Ott

;	May 22, 1998



.nolist				;Suppress listing of include file

.include "2313def.inc"		;Define chip particulars

.list



;***** Global register variables

.def	wreg	=R16		;General use working register

.def	timeout	=R17		;Timeout value passed to subroutine

.def	lcdstat	=R18		;LCD busy/wait status

.def	longtime=R19		;Long timer for powerup



;***** Other equates

.equ	lcdrs	=PD6		;LCD rs pin connected to PD6

.equ	lcdrw	=PD5		;LCD r/w pin connected to PD5

.equ	lcde	=PD4		;LCD e pin connected to PD4



;	Timer/Counter prescaler values

.equ	TSTOP	=0		;Stop Timer/Counter

.equ	TCK1	=1		;Timer/Counter runs from CK

.equ	TCK8	=2		;Timer/Counter runs from CK / 8

.equ	TCK64	=3		;Timer/Counter runs from CK / 64

.equ	TCK256	=4		;Timer/Counter runs from CK / 256

.equ	TCK1024	=5		;Timer/Counter runs from CK / 1024

.equ	TEXF	=6		;Timer/Counter runs from external falling edge

.equ	TEXR	=7		;Timer/Counter runs from external rising edge



.cseg



;	Interrupt vectors



.org	0

	rjmp	reset		;Reset Vector



.org	INT0addr		;External Interrupt0 Vector

	reti



.org	INT1addr		;External Interrupt1 Vector

	reti



.org	ICP1addr		;Input Capture1 Interrupt Vector

	reti



.org	OC1addr 		;Output Compare1 Interrupt Vector

	reti



.org	OVF1addr		;Overflow1 Interrupt Vector

	reti



.org	OVF0addr		;Overflow0 Interrupt Vector

	rjmp	t0int



.org	URXCaddr		;UART Receive Complete Interrupt Vector

	reti



.org	UDREaddr		;UART Data Register Empty Interrupt Vector

	reti



.org	UTXCaddr		;UART Transmit Complete Interrupt Vector

	reti



.org	ACIaddr			;Analog Comparator Interrupt Vector

	reti





;	Main program entry point on reset



reset:

	ldi	wreg,RAMEND	;Init Stack Pointer

	out	SPL,wreg

	ldi	wreg,TSTOP	;Timer 0 off (just in case)

	out	TCCR0,wreg	;Stop timer

	ldi	wreg,0b00000010	;Enable Timer 0 interrupt

	out	TIMSK,wreg

	sei			;Enable interrupts

	ldi	wreg,0xFF	;Turn off all LEDs

	out	PORTB,wreg

	ldi	wreg,0xFF	;Make port B pin all outputs

	out	DDRB,wreg

	ldi	longtime,100	;Wait 1.5 second for LCD power up

	ldi	timeout,256	;Delay 15 mS

puwait:

	rcall	delay

	dec	longtime

	brne	puwait

main:

	rcall	lcdinit		;Initialize LCD module

	rcall	lcdclr		;Clear LCD screen

	ldi	wreg,0x80	;Set address to line 1

	rcall	lcdcmd

	ldi	ZH,high(message*2)

	ldi	ZL,low(message*2);Init Z-pointer

nextc:

	lpm			;Get next character from ROM

	tst	R0		;See if at end of message

	breq	line2		;If so, do next message

	mov	wreg,R0		;Send it

	rcall	lcdput

	adiw	ZL,1		;Increment Z-pointer

	rjmp	nextc		;Loop for more

line2:

	ldi	wreg,0xC0	;Set address to line 2

	rcall	lcdcmd

	ldi	ZH,high(message2*2)

	ldi	ZL,low(message2*2);Init Z-pointer

nextc2:

	lpm			;Get next character from ROM

	tst	R0		;See if at end of message

	breq	halt		;If so, quit

	mov	wreg,R0		;Send it

	rcall	lcdput

	adiw	ZL,1		;Increment Z-pointer

	rjmp	nextc2		;Loop for more

halt:	

	rjmp	halt		;Sit here forever.....



;	Clear entire LCD and delay for a bit

lcdclr:

	ldi	wreg,1		;Clear LCD command

	rcall	lcdcmd

	ldi	timeout,256	;Delay 15 mS for clear command

	rcall	delay

	ret



;	Initialize LCD module

lcdinit:

	cbi	PORTB,0		;Turn on LED 0

	ldi	wreg,0		;Setup port pins

	out	PORTD,wreg	;Pull all pins low

	ldi	wreg,0xff	;All pins are outputs

	out	DDRD,wreg

	ldi	timeout,256	;Wait at least 15 mS at power up

	rcall	delay

	ldi	wreg,3		;Function set

	out	PORTD,wreg

;	rcall	strobe		;Toggle enable line

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	ldi	timeout,65	;Wait at least 4.1 mS

	rcall	delay

	ldi	wreg,3		;Function set

	out	PORTD,wreg

;	rcall	strobe		;Toggle enable line

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	ldi	timeout,2	;Wait at least 100 uS

	rcall	delay

	ldi	wreg,3		;Function set

	out	PORTD,wreg

;	rcall	strobe		;Toggle enable line

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	ldi	wreg,2		;Function set, 4 line interface

	out	PORTD,wreg

;	rcall	strobe		;Toggle enable line

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	ldi	wreg,0b11110000	;Make 4 data lines inputs

	out	DDRD,wreg

	

;	At this point, the normal 4 wire command routine can be used



	ldi	wreg,0b00101000	;Function set, 4 wire, 2 line, 5x7 font

	rcall	lcdcmd

	ldi	wreg,0b00001100	;Display on, no cursor, no blink

	rcall	lcdcmd

	ldi	wreg,0b00000110	;Address increment, no scrolling

	rcall	lcdcmd

	sbi	PORTB,0		;Turn off LED 0

	ret



;	Wait for LCD to go unbusy

lcdwait:

	cbi	PORTB,1		;Turn on LED 1

	ldi	wreg,0xF0	;Make 4 data lines inputs

	out	DDRD,wreg

	sbi	PORTD,lcdrw	;Set r/w pin to read

	cbi	PORTD,lcdrs	;Set register select to command

waitloop:

;	rcall	strobe

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	in	lcdstat,PIND	;Read busy flag

;	rcall	strobe		;Read, and ignore lower nibble

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	sbrc	lcdstat,3	;Loop until done

	rjmp	waitloop

	sbi	PORTB,1		;Turn off LED 1

	ret



;	Send command in wreg to LCD

lcdcmd:

	push	wreg		;Save character

	rcall	lcdwait		;Wait for LCD to be ready

	ldi	wreg,0xFF	;Make all port D pins outputs

	out	DDRD,wreg

	pop	wreg		;Get character back

	push	wreg		;Save another copy

	swap	wreg		;Get upper nibble

	andi	wreg,0x0F	;Strip off upper bits

	out	PORTD,wreg	;Put on port

;	rcall	strobe

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	pop	wreg		;Recall character

	andi	wreg,0x0F	;Strip off upper bits

	out	PORTD,wreg	;Put on port

;	rcall	strobe

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	ldi	wreg,0xF0	;Make 4 data lines inputs

	out	DDRD,wreg

	ret



;	Send character data in wreg to LCD

lcdput:

	push	wreg		;Save character

	rcall	lcdwait		;Wait for LCD to be ready

	ldi	wreg,0xFF	;Make all port D pins outputs

	out	DDRD,wreg

	pop	wreg		;Get character back

	push	wreg		;Save another copy

	swap	wreg		;Get upper nibble

	andi	wreg,0x0F	;Strip off upper bits

	out	PORTD,wreg	;Put on port

	sbi	PORTD,lcdrs	;Register select set for data

;	rcall	strobe

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	pop	wreg		;Recall character

	andi	wreg,0x0F	;Strip off upper bits

	out	PORTD,wreg	;Put on port

	sbi	PORTD,lcdrs	;Register select set for data

;	rcall	strobe

	sbi	PORTD,lcde	;Toggle enable line

	cbi	PORTD,lcde

	ldi	wreg,0xF0	;Make 4 data lines inputs

	out	DDRD,wreg

	ret



;***** Timer 0 overflow interrupt handler

t0int:

	set			;Set T flag

	ldi	wreg,TSTOP	;Timer 0 off

	out	TCCR0,wreg	;Stop timer

	reti			;Done, return



;***** Delay n*64 microseconds using timer 0, delay time passed in timeout

delay:

	in	wreg,SREG	;Save status register

	push	wreg

	out	TCNT0,timeout

	clt			;Clear T

	ldi	wreg,TCK256	;Timer 0 prescaler, CK / 256

	out	TCCR0,wreg	;Run timer

dwait:

	brtc	dwait		;Wait for timer 0 interrupt to set T

	pop	wreg		;Restore status register

	out	SREG,wreg

	ret



message:

	.db	"Time 09:45:33 PM",0

message2:

	.db	"Temp 75.6",0xDF," F",0



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