MFRC630 no response from LPCD Interrupt mode

santosh2 — Fri, 24 Dec 2021 10:22:06 GMT

Hello All,

We have designed Low Power RFID based device where we are using MFRC630 Plus reader chip,with Mifare 1K classic card.

After reading version register of the RFID Chip we are understand this is MFRC63002 chip as per data sheet, also we have read Mifare 1K classic card.

We wanted configure LPCD(Low Power Card Detection) Interrupt for which we made respective configuration but i am not able to get LPCD Interrupt.

However if we configure any of TIMER interrupts(TIMER0 TO TIMER4) we are able to get interrupts.

we are not able to understand where we are going wrong please find below code for LPCD interrupt Configuration.

SoftReset(); //Soft reset the RFID chip MFRC630CmdIdle(); MFRC630FlushFifo(); // Configure Radio Protocol MFRC630AN1102recommendedregisters(MFRC630PROTOISO14443A106MILLERMANCHESTER); MFRC630WriteReg(MFRC630_REG_DRVMOD, 0x8E); MFRC630WriteReg(MFRC630_REG_TXAMP, 0x12); MFRC630WriteReg(MFRC630_REG_DRVCON, 0x39); MFRC630WriteReg(MFRC630_REG_TXL, 0x06); uint8_t instruction; // ready the request. uint8_t send_req[] = {instruction}; MFRC630WriteReg(0x06, 0x7F); // clear interrupts MFRC630WriteReg(0x07, 0x7F); MFRC630WriteReg(0x08,0x80); MFRC630WriteReg(0x09,0xE0); //only trigger on LPCD for irq1 MFRC630WriteReg(0x24, 0x00); // Write min. T4 reload value Hi MFRC630WriteReg(0x25, 0x05); // Write min. T4 reload value Lo MFRC630WriteReg(0x23,0xDC); // Config T4 for AutoLPCD&AutoRestart.Set AutoTrimm bit.Start T4. while(!(MFRC630ReadReg( 0x23) & 0x80)) { MFRC630WriteReg( 0x23 , 0xDC); } MFRC630WriteReg(0x43, 0x40); while(!(MFRC630ReadReg(0x00) & 0x80)) { MFRC630WriteReg(0x00, 0x41); }

I would request if possible can any one please help us with LPCD interrupt configuration at your earliest.

Please let me know if there any mistakes or modification which we are missing for LPCD configuration.

Regards
Santosh P

Re: MFRC630 no response from LPCD Interrupt mode

fangfang — Wed, 29 Dec 2021 02:28:02 GMT

Hi @santosh2 ,

Actually there is a LPCD demo "NfcrdlibTst12_Rc663Lpcd " available in the latest NFC reader library, and we also provide the following app note on LPCD topic, Please kindly refer to the following for details.
https://www.nxp.com/docs/en/application-note/AN11783.pdf.

And you may refer to the information for your application.

Have a nice day.

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topic Re: MFRC630 no response from LPCD Interrupt mode in NFC

MFRC630 no response from LPCD Interrupt mode

Re: MFRC630 no response from LPCD Interrupt mode