NFCのトピックRe: PN5180 'Busy' handling

PN5180 'Busy' handling

smiwa — Fri, 28 Oct 2016 01:12:20 GMT

I have a question about BUSY signal of PN5180.

By my understanding,

---When the host send the command to PN5180, PN5180 set BUSY to high level, And after the internal processing of PN5180 has finished, it goes low.

My question is how long this 'high' state continues. As my system watches BUSY line for waiting response data, I must set the timeout value.

I appreciate your reply as soon as possible.

Best regards,

S. Miwa

Re: PN5180 'Busy' handling

weidong_sun — Mon, 31 Oct 2016 03:36:11 GMT

Hello Miwa,

I discussed the signal with NFC technical team, It's very hard to give an accurate continuous time on "High" state, because at the time PN5180 is handling data, and you know , data size determines the of "High" state, so from datasheet, the "time" was not listed.

After sending data to PN5180, you will have to wait until the line's state to be LOW. So in software, you had better use "interrupt" operation for BUSY signal.

Hope above advice can help you!

Best Regards,

weidong

Re: PN5180 'Busy' handling

smiwa — Mon, 31 Oct 2016 10:11:38 GMT

Hello Weidong san,

Thank you for your information! I understood the situation but may I ask further question?

Please tell me what "interrupt" operation you advised is?

Thank you for your support!

Best regards,

S. Miwa