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Register settings for st25r3911b for ISO 15693

Question asked by nicolai geske on Jun 14, 2018
Latest reply on Jun 22, 2018 by Ulysses HERNIOSUS

Hello ST25 community.

Some weeks ago I wrote this thread:

 

https://community.st.com/thread/50242-iso-15693-sof-eof-for-st25r3911b

 

I got the coding as in the example and it works. (The bytes are coded as it is mentioned in ISO 15693 datasheet)

I want to use 1 out of 4 coding for transmit from VCD to VICC:

Following register settings are used:

Defined: MSB to LSB ( 7 to 0 )

 

*-----------------------------------------------------------------------------------------------------------*

*register settings for iso15693*

 

Mode Definition Register                           (0x03)      : 0 1 1 1 0 0 0 0 - sub carrier stream mode

 

Bit Rate Definition Register                       (0x04)      : 0 0 1 0 0 0 1 0 - bit rate fc/32

 

Stream Mode Definition Register              (0x08)      : 0 0 1 1 0 0 0 0 - sub carrier frequency fc/32 , sub carrier pulses 4, time period fc/128

 

Auxiliary Definition Register                      (0x09)      : 0 0 1 0 0 1 0 0 - set modulation AM

 

AM Modulation Depth Control Register    (0x24)      : 0 1 1 0 1 1 0 0 - set modulation depth to 29.7

 

After these settings I use following direct commands:

 

send_direct_command(RFID_CALIBRATE_MODULATION_DEPTH);

send_direct_command(RFID_CALIBRATE_ANTENNA);

 

For the st25r3911b power up I use following settings:

 

IO Configuration Register 2             (0x01)      : 1 0 0 0 0 0 0 0 - set power supply of ST25 to 3.3 volt

 

Operation Control Register              (0x02)      : 1 1 0 0 1 0 0 0 - enable (set to 1): en, rx_en,tx_en

 

send_direct_command(RFID_ADJUST_REGULATORS);

 

*-----------------------------------------------------------------------------------------------------------*

 

I'm not sure if these settings are right. Hopefully someone could check.

As an attachment I send the communication VCD to VICC on an oscilloscope. I got this using a different antenna.

 

Best regards

 

Nicolai.

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