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Help (RFID)

Lam Phan Huynh
Prodigy 160 points
Other Parts Discussed in Thread: TMS3705

i use TMS3705.Here is code

        TXCT=1;
        delay_ms(200);
        TXCT=0;
        delay_us(50);
        TXCT=1;
        delay_us(2050);
        TXCT=0;
        delay_ms(51);
       TXCT=1;
        delay_us(2800);


I get data from SCIO with one tag. (RO tag)

each time it sends a different data.

protocol: 0XAF_50ms_data

pls help me !

thank

  • 0
    TI__Guru* 91206 points

    Lam -

    for RO/RW tags:

    toffL = 300uSec

    tonL = 1700uSec

    toffH = 1000uSec

    tonH = 1000uSec

    or in C...

    PWMtimes.usToffH  = 1000; //for RO_RW_tags, JDW 09/17/2010
    PWMtimes.usTonH   = 1000;
    PWMtimes.usToffL  = 300;
    PWMtimes.usTonL   = 1700;

    and please see attached as it may help you duplicate with your scope

     3487.Notes on TMS3705A1DRG4 & Read.ppt

     

  • 0 in reply to Josh Wyatt
    Prodigy 160 points

    Dear Josh !

    Thanks you so much!

    i use RI-TRP-W9QL-30    

                      

    With 1 code:

             TXCT=1;
            delay_ms(200);
            TXCT=0;

            Start_caputre();//------------------> Capture input SCIO
            delay_us(50);
            TXCT=1;
            delay_us(2050);

            TXCT=0;
            delay_ms(51);
           TXCT=1;
            delay_us(3000);

    This is timing from SCIO ( with 1 tag, it have 2 Data). what is wrong? and what is data?

  • 0 in reply to Lam Phan Huynh
    TI__Guru* 91206 points

    Lam -

    again, i think you will find better results if you change the timings as i indicated before.