main.asm

IR Decoding source code

	.include "pbir.h"
	.include "../lib/serial.h"

	.module main_asm


AUTOSTART = 0
PAULMON = 0
;---------------------------------------------------------;
;Bits
	.area	bits (ABS)
irprefound:
	.blkb	1

;---------------------------------------------------------;
;Data
	.area	data (REL)
bits:
	.blkb	1
irbitcnt:
	.blkb	1
irmesg:
	.blkb	2
ircode:
	.blkb	1
irtimersample:
	.blkb	2
stack:

;---------------------------------------------------------;
;Interrupt vectors

	.area	vectors (REL)

;reset vector
	ljmp	init

;ext int0 vector (base + 3)
	ljmp	pbir_isr

	.blkb   5
;timer0 vector (base + 0x0b)
	reti

	.blkb	7
;ext int1 vector (base + 0x13)
	reti
	
	.blkb	7
;timer1 vector (base + 0x1b)
	reti

	.blkb	7
;serial vector (base + 0x23)
	reti

	.blkb	7
;timer2 vector (base + 0x2b) 8052 ONLY
	reti

;---------------------------------------------------------;
; Code
	.area	code (REL)

; Paulmon header
.if PAULMON

.db     0xA5, 0xE5, 0xE0, 0xA5     ;signature bytes

.if AUTOSTART
.db     253, 0, 0, 0               ;id
.else
.db	254, 'T, 0, 0		   ;id (254=user installed command)
.endif

.db     0, 0, 0, 0                 ;reserved
.db     0, 0, 0, 0                 ;reserved
.db     0, 0, 0, 0                 ;reserved
.db     0, 0, 0, 0                 ;reserved
.db     0, 0, 0, 0                 ;user defined
.db     255, 255, 255, 255         ;length and checksum (255=unused)
.asciz  "Packard Bell Remote RX"

	. = . + 9
.endif ; PAULMON
;---------------------------------------------------------;
init::
	clr	a
	mov	ie, a		;all interrupts off
	mov	ip, a
	mov	psw, a
	mov	tmod, a
	mov	tcon, a
	mov	sp, #stack

	lcall	serial_init
.if PAULMON
;hello message
	mov	dptr, #initstr
	lcall	pstr
.endif

;timer 0
	orl	tmod, #0x01	;16 bit counter
	setb	tr0

	lcall	pbir_init

;interrupt 0
	setb	p3.2		;enable int0 edge triggered
	setb	it0
	setb	ex0

	lcall	pbir_start
	setb	ea

main_loop:
	mov	a, #0xff
	cjne	a, ircode, main_print
	jnb	ri, main_loop
	lcall	cin
	lcall	cout
	sjmp	main_loop
;print received code
main_print:
	xch	a, ircode
	mov	b, a
	anl	a, #0b00001111
	cjne	a, #0x8, main_print_not8
	mov	dptr, #lookup_lsb8
	sjmp	main_print_lookup
main_print_not8:
	cjne	a, #0x2, main_print_not2
	mov	dptr, #lookup_lsb2
	sjmp	main_print_lookup
main_print_not2:
	jnz	main_print_unk
	mov	dptr, #lookup_lsb0
main_print_lookup:
	mov	a, b
	anl	a, #0xf0
	xrl	a, #0xf0	;table is reversed (from hcll version)
	swap	a
	rl	a
	mov	b, a
	movc	a, @a+dptr
	mov	r6, a
	mov	a, b
	inc	a
	movc	a, @a+dptr
	mov	r7, a
	mov	dph, r6
	mov	dpl, r7
	lcall	pstr
	sjmp	main_print_done
main_print_unk:
	mov	a, b
	lcall	phex
main_print_done:
	lcall	newline
	sjmp	main_loop

;---------------------------------------------------------;
; Strings & tables
.if PAULMON
initstr:
	.asciz "\r\nPackard Bell Infrared Remote receiver startup\r\n"
.endif
	
.IR0F:	.asciz	 "DISPLAY"
.IR17:	.asciz	 "IR3"
.IR1D:	.asciz	 "AUX3"
.IR1F:	.asciz	 "AUX1"
.IR2F:	.asciz	 "RIGHT"
.IR37:	.asciz	 "VOLDOWN"
.IR3D:	.asciz	 "IR2"
.IR3F:	.asciz	 "IR8"
.IR47:	.asciz	 "LMOUSE"
.IR4F:	.asciz	 "CHNUP"
.IR57:	.asciz	 "IR9"
.IR5D:	.asciz	 "AUX2"
.IR5F:	.asciz	 "CD"
.IR6F:	.asciz	 "UP"
.IR77:	.asciz	 "MUTE"
.IR7D:	.asciz	 "IR5"
.IR7F:	.asciz	 "IR0"
.IR8F:	.asciz	 "ENTER"
.IR97:	.asciz	 "IR6"
.IR9D:	.asciz	 "SRS"
.IR9F:	.asciz	 "PHONE"
.IRAF:	.asciz	 "DOWN"
.IRB7:	.asciz	 "VOLUP"
.IRBD:	.asciz	 "IR1"
.IRBF:	.asciz	 "IR7"
.IRC7:	.asciz	 "RMOUSE"
.IRCF:	.asciz	 "CHNDOWN"
.IRD7:	.asciz	 "HASH"
.IRDD:	.asciz	 "MESSAGE"
.IRDF:	.asciz	 "HELP"
.IREF:	.asciz	 "LEFT"
.IRF7:	.asciz	 "MENU"
.IRFD:	.asciz	 "IR4"
.IRFF:	.asciz	 "STAR"
.IRERROR:.asciz	 "ERROR"

;
; string lookup table
;
lookup_lsb8:
	.word	 .IRERROR
	.word	 .IR17
	.word	 .IRERROR
	.word	 .IR37
	.word	 .IR47
	.word	 .IR57
	.word	 .IRERROR
	.word	 .IR77
	.word	 .IRERROR
	.word	 .IR97
	.word	 .IRERROR
	.word	 .IRB7
	.word	 .IRC7
	.word	 .IRD7
	.word	 .IRERROR
	.word	 .IRF7
lookup_lsb2:
	.word	 .IRERROR
	.word	 .IR1D
	.word	 .IRERROR
	.word	 .IR3D
	.word	 .IRERROR
	.word	 .IR5D
	.word	 .IRERROR
	.word	 .IR7D
	.word	 .IRERROR
	.word	 .IR9D
	.word	 .IRERROR
	.word	 .IRBD
	.word	 .IRERROR
	.word	 .IRDD
	.word	 .IRERROR
	.word	 .IRFD
lookup_lsb0:
	.word	 .IR0F
	.word	 .IR1F
	.word	 .IR2F
	.word	 .IR3F
	.word	 .IR4F
	.word	 .IR5F
	.word	 .IR6F
	.word	 .IR7F
	.word	 .IR8F
	.word	 .IR9F
	.word	 .IRAF
	.word	 .IRBF
	.word	 .IRCF
	.word	 .IRDF
	.word	 .IREF
	.word	 .IRFF