How to send an INTERRUPT command to ST25DV64K

[Ggsg.1]

Hi, i am working on a mobile android application, and from the firmware team they told me i need to this procedure:

1. User closes his mobile phone to climatic sensor.

2. A mobile app send a ManageGPO command (0x80) to ST25DV64K chip.

3. This command raises RF_INTERRUPT in NFC which is seen by MCU.

4. MCU updates values in DGN memory space.

But how can I do this? I am a beginner in this technology, so i don't have much knowledge.

I have also tried to send some custom command with the ST25 demo app, like 02 80 02 00

but the response is 01 01 ISO15693_CMD_NOT_SUPPORTED

[JL. Lebon · Accepted solution]

Hello,

In order to send interrupts from ST25DV, you need first to configure GPO output of the ST25DV. Here are the steps:

• present the configuration password (pwd 0, default value all 0x00): this is done using the Present Password command is 02 B3 02 00 00 00 00 00 00 00 00 00
• enable RF_INTERRUPT (bit 2) and GPO output (bit 7) in the GPO static register (address 00). This is done using the Write Configuration command: 02 A1 02 00 84
• Then, you can use the ManageGPO command to trigger the interrupt: 02 A9 02 80

Your command 02 80 02 00 is not formed correctly. Please refer to datasheet (https://www.st.com/resource/en/datasheet/st25dv64k.pdf) chapter "7.6.30 Manage GPO" to see how this command is formed: request flag, command code, manufacturer code, then the value 0x80 for RF_INTERRUPT. (the UID is only present if you set the request flag to 0x22 instead of 0x02. In your command, you miss the command and the manufacturer code.

Best regards.