How to build own middleware code for ST25R3916B/3920B instead of using RFAL

[LeoWu]

Hi ST

Now I am using ST25R3916B evaluation board, it works well with the project code you provided.

My final target is using 3920B on automotive for demostrating NFC card detection as well as digital car access to customer.

But we will finally change to other platform's MCU, not use ST's hsot MCU.

Due to our MCU has limited Fash / RAM size, we are considering to build our own middleware code to drive NFC frond end. but it looks like it's hard to understand the protocol through I2C waveform, and no any protocol document is avaiable on your website.

Is migating RFAL the only way I can do for realizing NFC function with 3916B / 3920B? 

Thanks

Leo

 

 

 

[Brian TIDAL]

Hi Leo,

ST25R3916, ST25R3916B, ST25R3917, ST25R3917B, ST25R3918, ST25R3920, and ST25R3920B use the same RFAL library (see Introduction section in UM2890).

Regarding the memory footprint, ensure that you consider the microcontroller hardware abstraction layer (HAL) libraries, such as the SPI or I²C drivers, and the flash memory and RAM size of the application on top of the RFAL. 8 KB RAM might be too small.

For CCC applications, I would suggest using the ST25R500 automotive device. It also uses the RFAL library that provides the same API for the application. 

Regarding the total solution, do you mean a turnkey solution or a reference design?

Rgds

BT

 

[Andrew Neil]

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@LeoWu wrote:

it looks like it's hard to understand the protocol through I2C waveform, and no any protocol document is avaiable on your website.

---

There's a list of commands in the datasheet:

https://www.st.com/resource/en/datasheet/st25r3916b.pdf#page=60

via: https://www.st.com/en/nfc/st25r3916b.html#documentation

 

[Brian TIDAL]

Hi Andrew,

The RFAL library provides an abstraction layer that eliminates the need to manage register-level commands described in the datasheet. Therefore, the use of the RFAL library is recommended: the same API can be reused on different products of the ST25R family without having to change the application code.

Rgds

BT

[Andrew Neil]

Indeed.

But if @LeoWu wants to write something from scratch, the datasheet would always be the place to start...