topic Re: LCRC663 can not get respond in NFC

LCRC663 can not get respond

臣柱宣 — Thu, 11 Jan 2018 01:02:50 GMT

our company use lcrc663 as an NFC device to read Mifare1 card。

the mcu is IMX6Q，the driver write by myself can send REQA(0x26) and get ATQA (0x04 0x00)from PICC.

but send anticollision (0x93,0x20) can not get respond from picc.

my driver set register as follows:

[ 35.056201] lcrc663-get addr= 0x00 ,reg =0x00
[ 35.056274] lcrc663-get addr= 0x01 ,reg =0x40
[ 35.056348] lcrc663-get addr= 0x02 ,reg =0xA0
[ 35.056421] lcrc663-get addr= 0x03 ,reg =0x1F
[ 35.056494] lcrc663-get addr= 0x04 ,reg =0x00
[ 35.056567] lcrc663-get addr= 0x05 ,reg =0x00
[ 35.056639] lcrc663-get addr= 0x06 ,reg =0x3C
[ 35.056712] lcrc663-get addr= 0x07 ,reg =0x40
[ 35.056785] lcrc663-get addr= 0x08 ,reg =0x07
[ 35.056858] lcrc663-get addr= 0x09 ,reg =0x7F
[ 35.056932] lcrc663-get addr= 0x0A ,reg =0x00
[ 35.057005] lcrc663-get addr= 0x0B ,reg =0x00
[ 35.057078] lcrc663-get addr= 0x0C ,reg =0x80
[ 35.057152] lcrc663-get addr= 0x0D ,reg =0x00

other rigister value is set as 106k 14443A by loadreg and loadprotocol cmd.

the only diffrence between send REQA and Anticollision is

TxDataNum （address 2Eh） this register change from 0x0f to0x08

Can you help me to find where is the problem？ thankyou

Re: LCRC663 can not get respond

Kan_Li — Tue, 16 Jan 2018 06:50:40 GMT

Hi，

Looks like you duplicated the same topic in the thread of LCRC663 只能获得ATQA .

Have a great day,
Kan

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Re: LCRC663 can not get respond

臣柱宣 — Tue, 16 Jan 2018 07:01:44 GMT

搞定了，谢谢，请问lcrc663能否调整发射功率大小，比如都是在14443A协议106k频率的情况下调整发射功率？

Re: LCRC663 can not get respond

Kan_Li — Wed, 17 Jan 2018 05:35:57 GMT

data sheet上说“A higher supply voltage at TVDD will result in a higher field strength.”所以你可以调整TVDD来实现，TVDD最大为5.5V，请注意ITVDD的最大值为250mA。

Have a great day,
Kan