NFCのトピックPN5180 has issue with long frames > 255 bytes

PN5180 has issue with long frames > 255 bytes

michaelpieber — Wed, 24 Jan 2018 16:19:39 GMT

Dear Community,

I started using the PN5180 demo board in a project. Most stuff is working fine so far except for one thing:

The datasheet states the reception buffer has a size of 508 bytes. However, when I try to receive more than 284 bytes the PN5180 seems to stop receiving data at 284 bytes. The Rx-IRQ is set, the number of bytes received is fixed to 0x11C.

Furthermore, for frames with more than 255 bytes the PN5180 seems not checking the CRC (correctly).

According to the EEPROM content I'm using version 3.4 which is a quite old one - but looking at the change information there was no change on that item.

EEPROM content address 0x10-0x15: 0x04 03 04 03 00 90

Any help is very much appreciated

Best, Michael

pn5180‌

reception_buffer‌

Re: PN5180 has issue with long frames > 255 bytes

IvanRuiz — Thu, 01 Feb 2018 20:51:37 GMT

Hello,

Which example of the NXP NFC Reader Library is your project based on?

Regards,

Ivan.

Re: PN5180 has issue with long frames > 255 bytes

michaelpieber — Thu, 01 Feb 2018 21:32:04 GMT

Hello, thanks for your reply!

My project is not based on Reader-Lib, but I directly control the PN5180 via commands and register read/writes. Here the sequence (Pseudo code):

WriteReg (REG_SYSTEM_CONFIG, 0x00000100)
Command CMD_LOAD_RF_CONFIG (RF_CONFIG_TX_CMA_106, RF_CONFIG_RX_CMA_106);
WriteMaskOr (REG_CRC_TX_CONFIG, 0x00000001);
WriteMaskOr (REG_CRC_RX_CONFIG, 0x00000001);

// Clearing Initiator bit and enabling transceive
WriteReg (REG_SYSTEM_CONFIG, 0x00000000);
Sleep(10);
WriteMaskOr (REG_TRANSCEIVER_CONFIG, 0xFFFFFFFE);
WriteReg (REG_SYSTEM_CONFIG, 0x00000003);
WriteReg (REG_IRQ_CLEAR, 0xFFFFFFFF);

// Counterpart is transmitted data in between
Sleep(500);
// Poll RxIRQ
ReadReg (REG_IRQ_STATUS);
// Check length of received data
ReadReg (REG_RX_STATUS);
Command CMD_READ_DATA

This works well for frames < 256 byte and does not work at all for frames 284bytes. Between 256 and 284 CRC seems not to be checked.

Thanks in advance!

Michael

Re: PN5180 has issue with long frames > 255 bytes

michaelpieber — Thu, 08 Mar 2018 17:45:26 GMT

Hi again to all,

any ideas or solutions?

Thanks, Michael