topic Re: RF transmission speed selection in NFC

RF transmission speed selection

c_adharumaraj — Mon, 24 Aug 2020 06:43:23 GMT

Hi All,

We are using the PN553 NFC controller in an android device.

We want some information on how to select the RF speed used between the NFC card and the reader.

When we are reading type A/B NFC cards we observe that the RF transmission speed selected is 106kbps even though the card is capable of higher speeds.

When the card is used with third party readers we see the speed negotiated between the reader and the card is higher.

We tried modifying the NXP_CORE_CONF configuration in libnfc-nxp_RF.conf but there was no effect.

NXP_CORE_CONF={ 20, 02, 2E, 0E,

28, 01, 02,

....

Can anyone please let us know if this is the right place to change? Else how can this speed can be configured?

Re: RF transmission speed selection

Kan_Li — Tue, 01 Sep 2020 09:44:39 GMT

Hi ,

Usually the speed is changed automatically after a PPS request, so did your application issue this request to the card?

Have a great day,
Kan

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Re: RF transmission speed selection

trivedimanva — Thu, 25 Mar 2021 10:46:32 GMT

Hi Kan,

Can you please share & add more details on selecting speed using application and card end.

As I am using Mifare DesFire Ev1 8k card which supports RF speed with 106, 212, 424 & 848 kbps, but it unable to change speed accordingly.

Currently I have hard coded my values in "phpalI14443p4a_Sw_ActivateCard" function for specific speeds. From my point of view it is not a valid way to do it for changing speed for CL Type A L4 card ? please correct if it is wrong.

Kindly let us know that how does it actually works to get change the RF speed from card or application side.

Thanks

Manva