Which NCI command does the NCIReadTS frame correspond to?

ElectronicCats / ElectronicCats-PN7150

Arduino library for I2C access to the PN7150 RFID/Near Field Communication chip

MIT License

34 stars 15 forks source link

Which NCI command does the NCIReadTS frame correspond to? #38

Closed DominusDRR closed 2 years ago

DominusDRR commented 2 years ago

I'm following your code to learn the operation of the PN7150.

I've gotten to the part where you want to determine the timestamp stored in NFC Controller

The frame that is sent is the following:

uint8_t NCIReadTS[] = {0x20, 0x03, 0x03, 0x01, 0xA0, 0x14};

Because of the OID which is the second byte that is equal to 0x03, you might think that the command corresponds to RF_DISCOVER_CMD

Am I right?

If I'm wrong, which NCI specification command would it correspond to?

Regards

Eric286 commented 2 years ago

Hello @DominusDRR !

"Am I right?"

Yes, you are right.

Once you send the discovery command (RF_DISCOVER_CMD) and if PN7150 responds with STATUS_OK, then the device will be in the RFST_DISCOVERY state executing the polling loop continuously.

Is this related to your previous issue?

Best Regards!

Support Team

DominusDRR commented 2 years ago

Thanks for answering, it is not related to the previous question.

I already understand how the frames that travel between the DH and NFCC are specified in NCI.

Regards

Eric286 commented 2 years ago

Hello @DominusDRR

Can we close the issue?

Best regards! Support Team.

DominusDRR commented 2 years ago

I already closed it. I saw that @sabas1080 reopened it and I thought I was going to comment something additional

DominusDRR commented 2 years ago

Hi.

I'm sorry to open the case again, I'm wrong in my statement, just like @Eric286

The frame that is sent:

uint8_t NCIReadTS[] = {0x20, 0x03, 0x03, 0x01, 0xA0, 0x14};

It doesn't correspond to RF_DISCOVER_CMD as I initially stated.

Corresponds to CORE_GET_CONFIG_CMD, which allows obtaining various parameters from the NFC device.

The fourth byte, which is equal to 1, indicates the number of parameters and the parameter is 0xA0, 0x14

This parameter corresponds to the EEPROM memory region called DH_EEPROM_AREA_2

In this region it seems to me that you keep what you call TIMESTAMP and I'm not sure exactly what value it is.

(There is another open thread regarding that topic)

Eric286 commented 2 years ago

Hello @DominusDRR !

I already discussed it with my colleagues and this question will be answered in the corresponding section to be able to close this one. Which would be issue number 39.

Have a good day!