I2C read/write sample C program for ST25DV.

[Anish Venkataraman]

I would like a sample code C program or even a list a commands that I need to use for reading and writing to the nfc tag. (ST25DV) via I2c. Are the commands similar to M24SR?@

Thanks

@Berenice BENVEGUDA​  @brk​ 

[JL. Lebon]

​Dear Anish,

ST25DV and M24SR have different I2C comands.

The ST25DV memory and system configration are accessed by simple byte addressing, just like standard EEPROMs. If you have C code for standard EEPROM, then the code to access ST25DV would be quiet similar.

Basically, ST25DV supports four I2C commands: I2C write, I2C read, I2C present password and I2C write password.

You can find explanation of ST25DV 's I2C commands in the datasheet, at chapter 6 (page 58). See datahseet at https://www.st.com/resource/en/datasheet/st25dv04k.pdf

You can find C source code example for STM32 microcontroller in the ST25DV Discovery kit SW at following link https://www.st.com/content/st_com/en/products/embedded-software/st25-nfc-rfid-software/stsw-st25dv001.html

Or C source code  example for the nucleo extension board X-NUCLEO-NFC04A1 board (STM32cube) at following link https://www.st.com/content/st_com/en/products/ecosystems/stm32-open-development-environment/stm32-nucleo-expansion-boards/stm32-ode-connect-hw/x-nucleo-nfc04a1.html

Hope this helps you.

Best regards.

[Kalpesh21]

Hi, 

I am using ST25DV16KC . If we go through Device select codes ,it shows address in 8 bit format(along with Read and Write bit)

If I have to neglect the read/write bit, then will the address be in this format or not
A6 : 1010 0110b - with read and write bit
53 : 101 0011b - without read and write bit