Student Attendance Logging Project

anne

Hi,
I am currently doing a project on student attendance logging system using RFID reader from Parrallax. I have almost finish my other parts of my project such as LCD, KEYPAD and also USB. However i have some problem in sending the output (Sout) of the RFID reader to my wireless transmitter which has 4 input data pins. I am using PIC16F877 to control the system. Unfortunately i have to use assembly language for this project. This has become a challange to me as i m not so good in this programming language. My problem is i could not break the output of the RFID reader which contain 12 bytes to my wireless transmitter which has only 4 input data pins. My program is as following:

Convert········ movf··· PORTA,w
·················· ·movwf·TAG0

··················· movwf·TAG1

··················· movwf·TAG2

················· movwf·TAG3

···················· movwf·TAG4

··················· movwf·TAG5
················· movwf·TAG6

··················· movwf·TAG7

················ movwf·TAG8

················ movwf·TAG9
··············· CALL· ·DATA_SEND
············· MOVF·TAG1,W
··········· ··CALL· ·DATA_SEND

·········· MOVF·TAG2,W
· ········ ·CALL ·DATA_SEND

·········· MOVF·TAG3,W
· ·········· CALL· ·DATA_SEND
·
··············· MOVF·TAG4,W
· ·········· ·CALL· ·DATA_SEND

············ ·MOVF·TAG5,W
· ·············· CALL· ·DATA_SEND
············ MOVF·TAG6,W
· ··········· CALL· ·DATA_SEND

·········· MOVF·TAG7,W
· ······ CALL· ·DATA_SEND

········ MOVF·TAG8,W
· ···· ·CALL· ·DATA_SEND
·
······ MOVF·TAG9,W
· ····· CALL· ·DATA_SEND


DATA_SEND······ BCF·· ·STATUS,RP1··;BANK 0
···················· ·BCF·· ·STATUS,RP0
······················MOVWF·VAR2···;SENDING 1ST FOUR BITS
···················· ·SWAPF·VAR2,W
····················· ANDLW·0X0F
·················· ·MOVWF·TRF_PORT·· ;TRF_PORT is portA
··················· call ·Delay5
················ MOVF·VAR2,W···;SENDING 2ND FOUR BITS
·············· ·ANDLW·0X0F
·············· ··MOVWF·TRF_PORT
················· call ·Delay5
················ RETURN
I would be grateful if someone could give some comment or idea to complete my project!! Thanks.

regards,
anne

Chris Savage

This post is being moved from the Completed Projects Forum to the Sandbox Forum.

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Chris Savage
Parallax Tech Support

anne

Do you have any idea on reading the rfid tag's id?? i have try to send the rfid reader out to pin RC6 of PIC16F877 which is the rx pin. Then i send it to PORTA. However i still cannot read the rfid id ?? Do you have any idea??