where do i learn bout PIC ?

**kupikupi** · 27th August 2005 04:19 PM

so is it that i can only use mplab to upload program to the PIC thru microchip programmers.. and for uploading via serial port .. i will need bootloader together with the bootloader software?? the one shown below?? are all bootloaders the same ?? meaning that i can just download any bootloaders and run with this software, Tiny bootloader??

**eblc1388** · 27th August 2005 04:39 PM

Originally Posted by kupikupi

so is it that i can only use mplab to upload program to the PIC thru microchip programmers..

MPLAB is a development enviornment where the asm file is compiled/assembled into a HEX file. You can use either Microchip's programmers or other programmers or even build one yourself to send the HEX into the PIC. See here:

A home made programmer

Originally Posted by kupikupi

.. and for uploading via serial port ..

This is an option that requires no programmer except a standard RS232 serial connection to the PC. Suitable for people who do not have access to programmers at home, like you are now.

Originally Posted by kupikupi

i will need bootloader together with the bootloader software?? the one shown below?? are all bootloaders the same ?? meaning that i can just download any bootloaders and run with this software, Tiny bootloader??

All bootloaders are different. Of course they are if not why we have so many?

Every bootloader need a specific software to work. For some, that specific software is simply the terminal program like Hyperterm. For others, like TinyBootloader, you have to run it's software for it to work.

**kupikupi** · 27th August 2005 05:04 PM

eblc1388 ... i got it .. very clear explanation ... so now ... since im using the tiny bootloader codes, i'll have to use the software tinybootloader provides.. thanx alot....

do u know how the IR module works with the PIC?? where is the receiver placed and where is the transmitter placed ?? wat components does the IR consist of and do i get it part by part or it's sold as 1 set?? if i use a joystick to control the direction of the motor .. how does a joystick send signal to the PIC?? and is the transmitter connected to the joystick ???

**eblc1388** · 28th August 2005 07:51 AM

Originally Posted by kupikupi

do u know how the IR module works with the PIC?? where is the receiver placed and where is the transmitter placed ??

The receiver is placed such that the IR beam from the transmitter can be seen.

Originally Posted by kupikupi

wat components does the IR consist of and do i get it part by part or it's sold as 1 set??

IR transmitter is just a diode like LED. It sends out IR instead of visible light. You can "see" the beam if you view it using a camera phone.

The receiver is sold as a complete module, mostly with three pins. Two for supply and one for signal output. The signal is the ON/OFF pattern of IR beam.

Originally Posted by kupikupi

if i use a joystick to control the direction of the motor .. how does a joystick send signal to the PIC?? and is the transmitter connected to the joystick ???

You'll need an interface between joystick and IR transmitter. You either build one or buy a cheap universal remote, use the internal components and wire the joystick switches to replace the original keys. You connect the receiver to one port pin of the PIC and using software to decode what command is being sent from the transmitter.

**kupikupi** · 28th August 2005 09:43 AM

;************************************************* ****************
title "PIC PowerBoard: Program pre PIC18F452"
subtitle "Version 1.00 (c) Jay.slovak 2005"
;************************************************* ****************
list p=18F452 R=DEC ; wat is this for
#include <P18F452.INC>

ERRORLEVEL 2 ; is it neccesary to put this?

;********** Definovanie uzivatelskych registrov *******************
Fosc equ 20 ;Frekvencia Oscilatora v Mhz

ZDRZ0 equ D'000' ;
ZDRZ1 equ D'001'
ZDRZ2 equ D'002'

;********** Zaciatok pamati programu ******************************
ORG 0x0004 ; does it ont always start at 0?
GOTO INIT
;********** Inicializacia procesora *******************************
ORG 0x002A
INIT MOVLW h'07' ; some led blinking program
MOVWF ADCON1,a ; doesnt have this , will it still
; work??
CLRF PORTA
CLRF PORTB
CLRF PORTC
CLRF PORTD
CLRF PORTE
CLRF TRISA
CLRF TRISB
CLRF TRISC
CLRF TRISD
CLRF TRISE

GOTO START
;********** Podprogramy Zdrzania @20Mhz *******************
Zdrz8s CALL Zdrz4s ; this is the delay part, by how
GOTO Zdrz4s ; much is the delay ?is it the
; same a the delay just below?
Zdrz4s CALL Zdrz2s
GOTO Zdrz2s

Zdrz2s CALL Zdrz1s
GOTO Zdrz1s

Zdrz1s CALL Zdrz500m
GOTO Zdrz500m

Zdrz500m NOP
MOVLW D'121'
MOVWF ZDRZ0 ; i think Zdrz500m delays by
MOVLW D'171' ; 500ms, but how is it here?
MOVWF ZDRZ1 ;121+171+13?
MOVLW D'13'
MOVWF ZDRZ2
GOTO Zdrz

Zdrz100m NOP ; why do we use a nop ?? to delay ??
NOP ; but i thought delay is done already ?
MOVLW D'122'
MOVWF ZDRZ0
MOVLW D'137'
MOVWF ZDRZ1
MOVLW D'3'
MOVWF ZDRZ2
GOTO Zdrz

Zdrz15m CALL Zdrz5m
CALL Zdrz5m
GOTO Zdrz5m

Zdrz5m CALL Zdrz1m
CALL Zdrz1m
CALL Zdrz1m
CALL Zdrz1m
GOTO Zdrz1m

Zdrz2m CALL Zdrz1m
GOTO Zdrz1m

Zdrz1m MOVLW D'140'
MOVWF ZDRZ0
MOVLW D'7'
MOVWF ZDRZ1
MOVLW D'1'
MOVWF ZDRZ2
NOP
NOP
GOTO Zdrz

Zdrz100 CALL Zdrz40
CALL Zdrz40
CALL Zdrz10
GOTO Zdrz10

Zdrz40 CALL Zdrz10
CALL Zdrz10
CALL Zdrz10
GOTO Zdrz10

Zdrz10 MOVLW D'10'
MOVWF ZDRZ0
MOVLW D'1'
MOVWF ZDRZ1
MOVLW D'1'
MOVWF ZDRZ2
NOP
NOP
GOTO Zdrz

Zdrz DECFSZ ZDRZ0,F
GOTO Zdrz
DECFSZ ZDRZ1,F
GOTO Zdrz
DECFSZ ZDRZ2,F
GOTO Zdrz
Return

;********** Hlavny Program *******************************
Start SETF PORTA
SETF PORTB
SETF PORTC
SETF PORTD
SETF PORTE
CALL Zdrz1s
CLRF PORTA ; this part turns off the LED?
CLRF PORTB
CLRF PORTC
CLRF PORTD
CLRF PORTE
CALL Zdrz1s
GOTO Start
end

hi guys, i think i more or less understand the whole program , just that
i'm a little confuse with the delay part, and for the one in bold that i commented , could u help me check if it's correct??

**kupikupi** · 28th August 2005 10:43 AM

You'll need an interface between joystick and IR transmitter. You either build one or buy a cheap universal remote, use the internal components and wire the joystick switches to replace the original keys. You connect the receiver to one port pin of the PIC and using software to decode what command is being sent from the transmitter.

any circuit diagrams or guide on how to do that ?? wat is a universal remote?
i dun understand how to do it.. thanx

is there any particular name for every IR module ?
wat does"Serial port controlled infrared transmitter with PIC" means?
is it the one i need to use ?? to control the direction of the wheelchair?? i am going to get the components soon, but i dont know how to buy it ? which one to choose ,
i just repeat wat i need IR for ..
i need to control the direction of the wheelchair manually ( with a sony joystick i guess, ) so the joystick tranmits the signal to the PIC to drive the motors ... so wat kind of IR module do i need??? is there any guide on how to connect all these parts? thanx alot

**kupikupi** · 29th August 2005 10:56 AM

Jay .... i tried to use the Tiny bootloader ... but it can't seem to work it shows this

**kupikupi** · 30th August 2005 12:33 PM

hi guys,

i just need some advice, i'm rushing to finish my current project and i'm really confuse, i don't know whether to learn c language or assembly, i need to submit my project in 3 weeks but i dont think i have time to learn either of them .. i tried to learn assembly but i think think it would really take quite some time to understand the whole thing... my C is a little ok ... well , at least it looks simpler and i could understand program i see quite fast, so i need some advice from u Pros to help me decide ... is there any tutorials about programming in C ?? i really need it urgently..

**Jay.slovak** · 30th August 2005 03:49 PM

Originally Posted by kupikupi

Jay .... i tried to use the Tiny bootloader ... but it can't seem to work it shows this

Did you program that PIC with bootloader HEX before with normal programmer? It won't work without it.

**kupikupi** · 30th August 2005 04:15 PM

Originally Posted by Jay.slovak

Did you program that PIC with bootloader HEX before with normal programmer? It won't work without it.

yes... i did .. i changed this

Code:

LIST      P=18F4320	; change also: Configure->SelectDevice from Mplab 
xtal EQU 20000000		; you may want to change: _XT_OSC_1H  _HS_OSC_1H  _HSPLL_OSC_1H
baud EQU 115200			; standard TinyBld baud rates: 115200 or 19200

to

Code:

LIST      P=18F452	; change also: Configure->SelectDevice from Mplab 
xtal EQU 20000000		; you may want to change: _XT_OSC_1H  _HS_OSC_1H  _HSPLL_OSC_1H
baud EQU 19200			; standard TinyBld baud rates: 115200 or 19200

it's correct rite??

but i think there might be a problem with the mplab in the lab.. i think i'll convert it to hex at home then try again ...

thanx Jay ...

**Jay.slovak** · 30th August 2005 04:18 PM

it is correct, but why did you lower the Baud rate?
Are you sure that your PIC and MAX232 have good connection to com port? Did you select correct com port? Did you RESET the PIC after you pressed the PROGRAM/WRITE FLASH button?

**kupikupi** · 30th August 2005 04:30 PM

Originally Posted by Jay.slovak

it is correct, but why did you lower the Baud rate?
Are you sure that your PIC and MAX232 have good connection to com port? Did you select correct com port? Did you RESET the PIC after you pressed the PROGRAM/WRITE FLASH button?

for the Baud rate, i just used the same one as when i run the terminal program, that was wat the lecturer told us to, but can i ask, is it that it's better to set a higher Baud rate?? for the com ports, i'm sure i had it right and working but i din reset the PIC after i write flash. i'll try again later // thanx Jay...

**Jay.slovak** · 30th August 2005 04:32 PM

Lower Baud rate will just make programming longer for a few seconds..

**eblc1388** · 30th August 2005 04:45 PM

Originally Posted by kupikupi

Code:

LIST      P=18F4320	; change also: Configure->SelectDevice

Why have you chosen to use the 18F4320 asm file to match your 18F452?

You should use the 18F252 asm file instead. The author has use the following name for this file:

"tinybld18F.asm"

**kupikupi** · 30th August 2005 04:49 PM

Originally Posted by eblc1388

Originally Posted by kupikupi

Code:

LIST      P=18F4320	; change also: Configure->SelectDevice

Why have you chosen to use the 18F4320 asm file to match your 18F452?

You should use the 18F252 asm file instead. The author has use the following name for this file:

"tinybld18F.asm"

well... i thought that was the closest one... so should i use the asm file for F252 now ??

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