AtomSoft
Well-Known Member
Ok Im following Nigels IR Tutorial 5. I have modified it just alittle to fit the 18F1320. I wanted to know if some one can skim over the code and tell me if everything seems ok so far...
Also Here is the schematic for the IR module i altered from Nigels Tuts... Does it also seem ok?
**broken link removed**
Just asking for thoughts and any input. Thanks for all the great info Nigel!
Keep up the good work..
Also Here is the schematic for the IR module i altered from Nigels Tuts... Does it also seem ok?
**broken link removed**
Just asking for thoughts and any input. Thanks for all the great info Nigel!
Keep up the good work..
Code:
;Tutorial 5.2 - Nigel Goodwin 2002
;Sony SIRC IR transmitter
LIST p=18F1320 ;tell assembler what chip we are using
include <p18F1320.inc> ;include the defaults for the chip
CONFIG OSC = INTIO1, WDT = OFF, LVP = OFF, DEBUG = ON ;sets the configuration settings (oscillator type etc.)
cblock 0x20 ;start of general purpose registers
count1 ;used in delay routine
counta ;used in delay routine
countb
count
Delay_Count
Bit_Cntr
Data_Byte
Dev_Byte
Rcv_Byte
Pulse
endc
IR_PORT Equ PORTB
IR_TRIS Equ TRISB
IR_Out Equ 0x01
Ser_Out Equ 0x01
SW1 Equ 7 ;set constants for the switches
SW2 Equ 6
SW3 Equ 5
SW4 Equ 4
TV_ID Equ 0x01 ;TV device ID
But1 Equ 0x00 ;numeric button ID's
But2 Equ 0x01
But3 Equ 0x02
But4 Equ 0x03
But5 Equ 0x04
But6 Equ 0x05
But7 Equ 0x06
But8 Equ 0x07
But9 Equ 0x08
ProgUp Equ d'16'
ProgDn Equ d'17'
VolUp Equ d'18'
VolDn Equ d'19'
org 0x0000 ;org sets the origin, 0x0000 for the 16F628,
goto Start ;this is where the program starts running
org 0x004
Start ;movlw 0x07
;movwf CMCON ;turn comparators off (make it like a 16F84)
movlw 0x62 ; 4MHz clock select
movwf OSCCON
clrf IR_PORT ;make PortB outputs low
;bsf STATUS, RP0 ;select bank 1
movlw b'11111101' ;set PortB all inputs, except RB1
movwf IR_TRIS
movlw 0xff
movwf PORTA
;bcf STATUS, RP0 ;select bank 0
Read_Sw
btfss PORTA, SW1
call Switch1
btfss PORTA, SW2
call Switch2
btfss PORTA, SW3
call Switch3
btfss PORTA, SW4
call Switch4
call Delay27
goto Read_Sw
Switch1 movlw ProgUp
call Xmit_RS232
retlw 0x00
Switch2 movlw ProgDn
call Xmit_RS232
retlw 0x00
Switch3 movlw VolUp
call Xmit_RS232
retlw 0x00
Switch4 movlw VolDn
call Xmit_RS232
retlw 0x00
TX_Start movlw d'92'
call IR_pulse
movlw d'23'
call NO_pulse
retlw 0x00
TX_One movlw d'46'
call IR_pulse
movlw d'23'
call NO_pulse
retlw 0x00
TX_Zero movlw d'23'
call IR_pulse
movlw d'23'
call NO_pulse
retlw 0x00
IR_pulse
MOVWF count ; Pulses the IR led at 38KHz
irloop BSF IR_PORT, IR_Out
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
BCF IR_PORT, IR_Out
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP
NOP
NOP ;
NOP ;
DECFSZ count,F
GOTO irloop
RETLW 0
NO_pulse
MOVWF count ; Doesn't pulse the IR led
irloop2 BCF IR_PORT, IR_Out
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
BCF IR_PORT, IR_Out
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP ;
NOP
NOP
NOP ;
NOP ;
DECFSZ count,F
GOTO irloop2
RETLW 0
Xmit_RS232 MOVWF Data_Byte ;move W to Data_Byte
MOVLW 0x07 ;set 7 DATA bits out
MOVWF Bit_Cntr
call TX_Start ;send start bit
Ser_Loop RRCF Data_Byte , f ;send one bit
BTFSC STATUS , C
call TX_One
BTFSS STATUS , C
call TX_Zero
DECFSZ Bit_Cntr , f ;test if all done
GOTO Ser_Loop
;now send device data
movlw D'1'
movwf Dev_Byte ;set device to TV
MOVLW 0x05 ;set 5 device bits out
MOVWF Bit_Cntr
Ser_Loop2 RRCF Dev_Byte , f ;send one bit
BTFSC STATUS , C
call TX_One
BTFSS STATUS , C
call TX_Zero
DECFSZ Bit_Cntr , f ;test if all done
GOTO Ser_Loop2
retlw 0x00
;Delay routines
Delay255 movlw 0xff ;delay 255 mS
goto d0
Delay100 movlw d'100' ;delay 100mS
goto d0
Delay50 movlw d'50' ;delay 50mS
goto d0
Delay27 movlw d'27' ;delay 27mS
goto d0
Delay20 movlw d'20' ;delay 20mS
goto d0
Delay5 movlw 0x05 ;delay 5.000 ms (4 MHz clock)
d0 movwf count1
d1 movlw 0xC7
movwf counta
movlw 0x01
movwf countb
Delay_0 decfsz counta, f
goto $+2
decfsz countb, f
goto Delay_0
decfsz count1 ,f
goto d1
retlw 0x00
;end of Delay routines
end