Nice I2C asembler routine for PIC16F84A needed

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traxonja

Joined: 06 Apr 2004
Posts: 109
Helped: 1

18 Apr 2004 19:27 i2c pic16f84

Hello,

does anybody have a nice (clean) routine for writing and reading-from an I2C memory device written for MPASM?
I will use PIC16F84A, and 24LC16 (2k) device so 1-byte address will be used, but 2-byte addresses are OK too.

I have this attached routine but it doesn't work Sad

, so if you have a nice tested one please post it here.

When I programm the device in PicBasic, it works, but with this routine in MPASM it doesn't work Sad

All best,
Trax

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zmanultra

Joined: 20 Mar 2004
Posts: 48
Helped: 2
Location: Australia

19 Apr 2004 2:30 pic16f84a i2c

Hi

is what the device that u have a smartcard (gold wafer) caus that cojntains the 2 ICs u talking about.

traxonja

Joined: 06 Apr 2004
Posts: 109
Helped: 1

19 Apr 2004 9:38 i2c pic16f84a

No, it's only my PIC and some eeprom, in my case it is 24c16.

Trax

Kripton2035

Joined: 19 Jul 2001
Posts: 611
Helped: 21
Location: Earth

19 Apr 2004 14:34 i2c assembler

be aware that if you look at the details of the picbasic language, the i2c routines works well only with hard i2c chips for example 16f876, but not the 16f84...
they work quite in master mode, but quite not in slave.

elektryk

Joined: 25 Apr 2002
Posts: 117
Location: POLAND

19 Apr 2004 14:54 pic i2c asm

Look at www.piclist.com huge library of source codes and clues sorted in categories.

sam_manchali

Joined: 14 Jun 2003
Posts: 105
Helped: 3
Location: sharjah

19 Apr 2004 15:04 16f i2c

hi,
check out the routines provided by microchip itself, they work fine to my knowleded!!
cheers
sam

C-Man

Joined: 19 Jul 2001
Posts: 1236
Helped: 73

19 Apr 2004 15:10 16f84 i2c

traxonja

a few years ago i programmed a project in PIC assembler which was storing data from a magnetic card reader in a 24C16 using a 16F84.

I have posted the source here:
http://www.elektroda.pl/eboard/searchtopic66923-.html

hope this is useful for you
best regards

elcielo

Joined: 13 Jun 2002
Posts: 854
Helped: 6

19 Apr 2004 16:23 cardreader with pic16f84

Interface I2C pour microcontrolleur PIC16C84

http://perso.easynet.fr/~chrisg/pici2c.htm

Simple I2C master code for 12-bit series PIC (<=5MHz clock)

http://www.kingswood-consulting.co.uk/pic/i2c.i

traxonja

Joined: 06 Apr 2004
Posts: 109
Helped: 1

19 Apr 2004 20:04 pic16f84a+24c01

Thanks for the answers. I found a nice routine at www.piclist.com.

And, I couldn't download a file from this forum because I am stil a new user and I don't have any points Sad

Best regards,
Trax

elektryk

Joined: 25 Apr 2002
Posts: 117
Location: POLAND

23 Apr 2004 14:52 pic16f84 i2c

traxonja wrote:

And, I couldn't download a file from this forum because I am stil a new user and I don't have any points Sad

You have now Wink

mbyka

Joined: 12 May 2002
Posts: 510
Helped: 1

23 Apr 2004 22:14 pic16f84 magnetic card reader

Hi
I can help you with my sample code
maybe Smile

Code:

LIST P=16F84
INCLUDE "P16F84.inc"
TITLE " 24Cxx Programming with pic"



EEPROM EQU 1CH
ADDR    EQU 1DH
DATAI    EQU 1EH
DATAO    EQU 1FH
TXBUF    EQU 20H
RXBUF    EQU 21H
COUNT    EQU 22H
DEL    EQU 23H
SEL    EQU 24H

DI    EQU 7
DO    EQU 6
SDA    EQU 1
SCL    EQU 0
;PortA.0--------->Serial Clock----------24Cxx's Pin:6
;PortA.1<-------->Serial Data-----------24Cxx's Pin:5
;PortB LED outs

__CONFIG _WDT_OFF & _XT_OSC & _CP_OFF

;====================================================
;========= start======================

ORG 000H
GOTO START

START
CALL PORT_INIT
MAIN
MOVLW 00H       ;Eeprom write Adress
MOVWF ADDR
MOVLW 23H       ;Eeprom data
MOVWF DATAO
CALL WRITE_EEPROM
MOVLW .100
CALL DELAY_NMS
MOVLW 00H       ;Eeprom read adress
MOVWF ADDR
CALL READ_EEPROM
MOVF DATAI,W
MOVWF PORTB       ;read from Eeprom transfer data portb
MOVLW .100
CALL DELAY_NMS
DONE
GOTO DONE

;========================================================
;================= Port Init ============================

PORT_INIT
CLRF PORTA
CLRF PORTB
;
BSF STATUS, RP0    ;page1 select
CLRF TRISA
CLRF TRISB
BCF STATUS, RP0    ;page0 select
;
CLRF PORTB
RETURN

;=============================================================
;======== eeprom cominication=========================

WRITE_EEPROM
CALL BSTART
;
MOVLW B'10100000'
MOVWF TXBUF
CALL TX
;
MOVF ADDR,W
MOVWF TXBUF
CALL TX
;
MOVF DATAO,W
MOVWF TXBUF
CALL TX
;
CALL BSTOP
;
RETURN

READ_EEPROM
CALL BSTART
;
MOVLW B'10100000'
MOVWF TXBUF
CALL TX
;
MOVF ADDR,W
MOVWF TXBUF
CALL TX
;
CALL BSTART
;
MOVLW B'10100001'
MOVWF TXBUF
CALL TX
;
CALL RX
;
CALL BSTOP
;
RETURN

BSTART
BSF PORTA,SDA
BSF STATUS, RP0
MOVLW 00H
MOVWF TRISA
BCF STATUS, RP0
;
BCF PORTA,SCL
NOP
BSF PORTA,SCL
NOP
NOP
NOP
NOP
NOP
BCF PORTA,SDA
NOP
NOP
NOP
NOP
NOP
BCF PORTA,SCL
NOP
NOP
RETURN

BSTOP
BSF STATUS, RP0
MOVLW 00H
MOVWF TRISA
BCF STATUS, RP0
;
BCF PORTA,SDA
NOP
NOP
NOP
BSF PORTA,SCL
NOP
NOP
NOP
BSF PORTA,SDA
NOP
NOP
BCF PORTA,SCL
NOP
NOP
NOP
RETURN

BITOUT
BSF STATUS, RP0
MOVLW 00H
MOVWF TRISA
BCF STATUS, RP0
;
BTFSS EEPROM,DO
GOTO BITLOW
BSF PORTA,SDA
GOTO CLK_OUT
BITLOW
BCF PORTA,SDA
CLK_OUT
BSF PORTA,SCL
NOP
NOP
NOP
NOP
BCF PORTA,SCL
NOP
RETURN

BITIN
BSF EEPROM,DI
;
BSF STATUS,RP0
MOVLW 02H
MOVWF TRISA
BCF STATUS, RP0
;
BSF PORTA,SCL
NOP
NOP
NOP
NOP
NOP
BTFSS PORTA,SDA
BCF EEPROM,DI
BCF PORTA,SCL
RETURN

TX
MOVLW .8
MOVWF COUNT
TXLP
BCF EEPROM,DO
BTFSC TXBUF,7
BSF EEPROM,DO
CALL BITOUT
RLF TXBUF,F
DECFSZ COUNT,F
GOTO TXLP
CALL BITIN
RETURN

RX
CLRF DATAI
MOVLW .8
MOVWF COUNT
BCF STATUS,0
RXLP
RLF DATAI,F
CALL BITIN
BTFSC EEPROM,DI
BSF DATAI,0
DECFSZ COUNT,F
GOTO RXLP
BSF EEPROM,DO
CALL BITOUT
RETURN

DELAY_NMS
MOVWF DEL
OUTTER_MS
MOVLW .110
MOVWF SEL
INNER_MS
NOP
NOP
NOP
NOP
NOP
NOP
DECFSZ SEL,F
GOTO INNER_MS
DECFSZ DEL,F
GOTO OUTTER_MS
RETURN

END

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elcielo

Joined: 13 Jun 2002
Posts: 854
Helped: 6

29 Apr 2004 23:50 tsa5055.asm

Copieur autonome de mémoires I2C 24C01 à 24C16
http://col2000.free.fr/copieur/cop_indx.htm

I2C-Programm fuer 2,65GHz-PLL-IC TSA5055 for PIC 16F84(A)
http://www.qsl.net/db0mwb/projekte/tsa5055.asm

PIC 16F84 - TIMER PCF8583 - EEPROM 24LC65, COMMUNICATION I2C ET AFFICHEUR LCD LTN211
http://www.asmfr.com/code.aspx?ID=15193

BUS I2C POUR PIC16XXX
http://www.asmfr.com/listecodes.aspx?catid=261

Couplage PIC16F84 & 24C16
http://col2000.free.fr/i2c/protocol/eeprom05.asm

hassan1980

Joined: 14 Jan 2005
Posts: 210
Helped: 3

07 Feb 2005 21:44 tsa5055 pic

I want a clear program for just reading and writing in serial eeprom like 24C64 with 16f84.

I need your help

dragosdiaconita

Joined: 22 Mar 2007
Posts: 1

22 Mar 2007 17:04 pic16f84 i2c slave basic

does anyone have an exe file to comunicate with the 16f84 serial out?
pls?
ty for ure kindnes

tonybg

Joined: 17 Mar 2007
Posts: 18
Helped: 2
Location: bulgaria

22 Mar 2007 17:43 pic16f84 read 24c01 eeprom

Why don't you try Application Maestro.It's a part of MPLAB.Generates many protocols,and explains all the details about hardware and software on the specfic code it generates.Hope it helped:D

iman_andeh

Joined: 19 Feb 2007
Posts: 16
Helped: 1

09 Jul 2007 4:41 i2c pic16f

how to communicate (read and write) the gold wafer card using other PIC mcu such as PIC16F877A?

i'm trying to build a portable gold wafer card reader/writer...

zmanultra

Joined: 20 Mar 2004
Posts: 48
Helped: 2
Location: Australia

09 Jul 2007 4:45 i2c with pic16f84a

its like programming a normal pic processor....the only difference is that u must creat a serial Comm routine...check out picbasic pro...it has some serial routines...thats the easiest way....or u can use microchip compiler....
hope this helps
Smile

iman_andeh

Joined: 19 Feb 2007
Posts: 16
Helped: 1

09 Jul 2007 23:58 16f84+i2c

is there any sample code that used to write gold wafer card?

zmanultra

Joined: 20 Mar 2004
Posts: 48
Helped: 2
Location: Australia

10 Jul 2007 0:23 master i2c for pic16f690

dont worry about "gold wafer card" look at it as simply programming a chip....(pic16) have u programed that chip b4....if not, just have a look at the sample code provided (e.g. pic basic is good for beginers)

iman_andeh

Joined: 19 Feb 2007
Posts: 16
Helped: 1

10 Jul 2007 1:26 pic16f84a mit iÂ²c

yes, i have programmed PIC before, that is PIC16F877a..

about gold wafer card,
i'm really confused what i should do now.
i tend to use circuit below as my gold wafer card reader and programmer

Nice I2C asembler routine for PIC16F84A needed

this circuit was grabbed from Silicon Chip (issue 178 (July 15, 2003), by Peter Smith)

but,
i really have no idea about the code. could you give an example code?

zmanultra

Joined: 20 Mar 2004
Posts: 48
Helped: 2
Location: Australia

10 Jul 2007 1:34 i2c pic16f84 meppel

i have programmed the exact same card b4...
the steps to go on about it.

for testing...

(write a serial routine which just outputs a letter every second or somthing...(in pic basic pro its just 2 lines of code...check it out) and then get a software (google it up) to monitor the serial port and have a look at the card(pic processor) is outputing.....

and then u should have a clearer pic of wat the hell is going on
hope this is helping u dude?