ISO15693

[sgtJohnny]

Hello,

Do you have any info on how to advance this library to read ISO15693 tags (with CLRC663) ?

[iwanders]

The RF side of things appears to be covered by the chip, protocol number 10, 11 and 12 according to AN11022, so that part is likely done after loading those protocols with the chip.

The hard part would be to implement the anticollision and transmission protocol, this is described in ISO/IEC 15693-3. Which - like a lot of standards - is not freely available unfortunately 😞 . If you obtain this - or a draft - it should describe the protocol that needs to be implemented. I presume it is pretty different from the ISO14443A protocol, given that a quick search for a library that implements it turns up no real results.

To get it to work one needs to implement the anti collision and transmission protocol for ISO15693. This is probably a fair bit of non-trivial work unfortunately. I don't have access to the hardware anymore, so there's little I can do to help. I'll leave this issue open, if there are others who would like to see ISO15693 implemented this may allow you to collaborate with them.

[sgtJohnny]

Thanks for your reply. I found a software with examples from nxp "PCSerial". My best guess is that this sends just SPI transmissions to the CLRC663
http://www.nxp.com/documents/software/210910.zip

If i look at the example with ISO14443A_4byteUID.jcf i see alot in common with your library, and the ISO15693_Inventroy.jcf looks different, but in general it looks very similar.

Maybe you could have a look?

[iwanders]

I took a look. Does indeed appear to necessary operations on the chip. It's probably SR = set register, GR = get register.

I don't really see any similarity between that .jcf file and the .c library, but you probably mean that the steps they take are the same. Which makes sense as the steps to read an ISO14443A card will be the same, regardless of which language you specify it in. Don't think they have proper anti-collision handling code.

You could probably try to perform the register read and writes they perform to read the UUID of the card for ISO15693. It may just work if you are trying to read one card only, but having this specific sequence of commands is a whole other thing then adding proper support for ISO15693 to the library.

[LinnHtunThaw]

You can get the NFC reader library from this link-
https://www.nxp.com/products/identification-and-security/nfc/nfc-reader-ics/nfc-reader-library-software-support-for-nfc-frontend-solutions:NFC-READER-LIBRARY?tab=In-Depth_Tab
It also includes the library for ISO15693.

[benbecke]

What is the status on that ?
@sgtJohnny did you get this implemented ?

[peturdainn]

I can confirm you can talk ISO15693 with this chip (SLRC610 actually but they are close). Sadly I can't share the code (commercial customer), but you can find very good sample code for TI chips for the collision handling (lots of TI doc also leak quite a bit of the spec). It's not very hard to port it, just check what functionality in the TI chip they are touching and find the similar one in the NXP chip.

[sgtJohnny]

I can also confirm, i've only implemented "Inventory" without colision detection, since in my case there cannot be colision (mechanically), so it works. There is a "PcSerial" script from NXP that can be converted to this library. I've i have some time, i will create pull request and modify, i had to convert this library to C++ so i need to make changes in this C version. I'm using the CLRC663 which can be both (14443 and 15693) but the three chips : MFRC630, SLC610,CLRC663 are identical, there functionality is just software locked by nxp...

If you need code sample, send me a message

[benbecke]

@sgtJohnny : I would be real thankful for an example. In the meantime i will try to understand the specifications around 15693.....
To the others : thank you for the information around the differences of the protocols.....

[sgtJohnny]

okay this is a short example, there is more values, but its to much to post in a comment:

you need to add new definiton for protocol type:
#define MFRC630_PROTO_ISO15693_1_OF_4_SSC26 10

after that you need to add a parameter macro:
#define MFRC630_RECOM_15693_ID2_SSC26 {0x8F, 0x10, 0x01, 0x06, 0x7B, 0x7B, 0x08, 0x00, 0x00, 0x88, 0xA9, 0x0F, 0x00, 0x02,0x10,0x44,0x12,0x06}

now its possible to modify functions AN1102_recommended_registers_skip
this allows you to configure the reader to to accept ISO15693.

After this, its possible to read iso15693 using following code:

uint16_t CLRC663::iso15693_read(uint8_t* uid) {

		uint8_t status =0;
		uint8_t inventory[16];
		write_reg(MFRC630_REG_DRVMOD,0x89); //Field on

		// Set short timeout. Timer-0,Timer-1 reload values(hi,lo)
		write_reg(MFRC630_REG_T0RELOADHI,0x24);
		write_reg(MFRC630_REG_T0RELOADLO,0xEB);
		write_reg(MFRC630_REG_T1RELOADHI,0x00);
		write_reg(MFRC630_REG_T1RELOADLO,0x00);

		// Cancel any command execution.Flush FIFO. Clear IRQ0,IRQ1
		write_reg(MFRC630_REG_COMMAND,0x00);
		write_reg(MFRC630_REG_FIFOCONTROL ,0xB0);
		write_reg(MFRC630_REG_IRQ0,0x7F);
		write_reg(MFRC630_REG_IRQ1,0x7F);


		// Write: "Flags" and "Inventory" cmd in FIFO

		write_reg(MFRC630_REG_FIFODATA ,0x36);
		write_reg(MFRC630_REG_FIFODATA ,0x01);
		write_reg(MFRC630_REG_FIFODATA ,0x00);
		write_reg(MFRC630_REG_FIFODATA ,0x00);
		write_reg(MFRC630_REG_COMMAND ,0x07);

		// Wait until the command is finished
		// Enable IRQ0,IRQ1 interrupt sources
		inventory[0] = read_reg(MFRC630_REG_IRQ0EN);
		write_reg(MFRC630_REG_IRQ0EN,0x18);
		inventory[0]= read_reg(MFRC630_REG_IRQ1EN);
		write_reg(MFRC630_REG_IRQ1EN,0x42);

		inventory[1]= read_reg(MFRC630_REG_IRQ1);

		uint8_t irq0_value = 0;
		uint8_t irq1_value = 0;

		//Wait for transmission ending
		while ((irq0_value & 0x08) !=0x08){
			irq0_value = irq0();

		}

		inventory[2] = read_reg(MFRC630_REG_IRQ0);
		inventory[3] = read_reg(MFRC630_REG_IRQ1);


		//Wait for timer1 underflow irq1(0x02) or RxIrQ irq0(0x04);
		while ( ((irq1_value & 0x02) !=0x02)  && ((irq0_value & 0x04) !=0x04)   ){
			irq1_value = irq1();
			irq0_value = irq0();

		};

		if((irq1_value & 0x02)){
			status = 0xFF;
			return status;
		};

		inventory[4] = read_reg(MFRC630_REG_IRQ0);
		inventory[5] = read_reg(MFRC630_REG_IRQ1);

		// Disable IRQ0,IRQ1 interrupt sources
		inventory[6] = read_reg(MFRC630_REG_IRQ0EN);
		write_reg(MFRC630_REG_IRQ0EN,0x00);
		inventory[6] = read_reg(MFRC630_REG_IRQ1EN);
		write_reg(MFRC630_REG_IRQ1EN,0x00);

		// Get IRQ0 status
		inventory[6] = read_reg(MFRC630_REG_IRQ0);
		inventory[7]= read_reg(MFRC630_REG_IRQ1);

		//get lenght of uid
		uint8_t uidlenght = read_reg(MFRC630_REG_FIFOLENGTH);

		if(uidlenght != 10){
			status = 0xFE;
			return status;

		}

		//read uid
		uid[0] = read_reg(MFRC630_REG_FIFODATA);
		uid[1] = read_reg(MFRC630_REG_FIFODATA);
		uid[2] = read_reg(MFRC630_REG_FIFODATA);
		uid[3] = read_reg(MFRC630_REG_FIFODATA);
		uid[4] = read_reg(MFRC630_REG_FIFODATA);
		uid[5] = read_reg(MFRC630_REG_FIFODATA);
		uid[6] = read_reg(MFRC630_REG_FIFODATA);
		uid[7] = read_reg(MFRC630_REG_FIFODATA);
		uid[8] = read_reg(MFRC630_REG_FIFODATA);
		uid[9] = read_reg(MFRC630_REG_FIFODATA);

		inventory[9] = read_reg(MFRC630_REG_IRQ0);
		inventory[10] = read_reg(MFRC630_REG_IRQ1);
		inventory[11] = read_reg(MFRC630_REG_FIFOLENGTH);

		// Read Error status register

		inventory[12] = read_reg(MFRC630_REG_ERROR );

		inventory[13] = read_reg(MFRC630_REG_TXDATANUM);
		write_reg(MFRC630_REG_TXDATANUM,0x08);
		inventory[14] = read_reg(MFRC630_REG_RXBITCTRL);
		inventory[15] = read_reg(MFRC630_REG_TXDATANUM);
		write_reg(MFRC630_REG_TXDATANUM,0x08);


		//Apply waiting time
		write_reg(MFRC630_REG_T0RELOADHI,0x20);
		write_reg(MFRC630_REG_T0RELOADLO,0xFF);
		write_reg(MFRC630_REG_T1RELOADHI,0x00);
		write_reg(MFRC630_REG_T1RELOADLO,0x00);
		inventory[14] = read_reg(0x0E);
		write_reg(MFRC630_REG_IRQ1,0x7F);	// Clear all IRQ1 flags

		status = 1;
		return status;
}

[benbecke]

Thank you very much.
I did some tests.
Code seems to be ok but always ending up in a Soft WDT Reset @ while loop checking both irq1_value and irq0_value
:-/

[sgtJohnny]

What MCU you use? Try to print out irq values, if arduino, use Serial.print(). If STM32 use SWO Trace Debug.

[benbecke]

I use esp8266 and clrc663 over spi.
Values always are :
Inventory[2]: 13
Inventory[3]: 32
irq0_value: 13
irq1_value: 32

So interesting after reflashing mcu reset seems to be gone but no card is detected and its jumping out where uidlenght is checked for length of 10.... :-/

Maybe we better can talk over mail -bmm.becker {at} gmail.com-

[iwanders]

@benbecke , @sgtJohnny , ( @peturdainn ) just reading up on this now. I still don't have anything to add, but I'm really happy to see others chime in and help out where I couldn't.

@sgtJohnny , I took the liberty of putting the large piece of code in a code block:

```cpp
void foo();
```

Given that there's already three people who've worked on this, it is probably something others may be interested as well. So if you or anyone has an example and is willing (and able) to share it I'd be happy to make sure it's added to the repo.