TRF7970A - Intrupt not coming

Hi Arun,

Your SPI clock is running pretty slow. Is there a reason it has to run slow? Try to run the SPI clock faster (1 or 2 MHz is ideal) and see if that helps.

If that doesn't work, please explain which interrupt are you looking for but is not appearing. What command(s) is being sent? If you can get some LSA captures with MISO, MOSI, SPI CLK, Slave Select, and IRQ lines that would be helpful as well.

Also to better understand your project I would like to know a few more details:

1) What application are you using the TRF7970A for?

2) What modes of NFC communication are you trying to use? (i.e. Peer 2 Peer, Card Emulation, etc.) And with what tag types?

3) What software/sample code are you using with the TRF7970A?

4) What hardware are you interfacing with it?

Dear Ralph,

Thanks for time and reply .

We are working on getting 2MHz SPI clock.

checking GPIO IRQ pin which internally calls handler function.

0x1C command for IRQ

EVM code flow commands.

able to read write using SPI read write function of all NFC registers. 

capture all these signals and update you.

  We are using TI provided software for TRF7970A. and interfacing with STM controller.

/*****************************************************************************************************************

/* // SPI and GPIO setup and configuration.  EN1 and EN2 configuration  */

Trf797xCommunicationSetup(); 

/*/ SPI chip select low */

GPIO_ResetBits(GPIOA, GPIO_Pin_4);  

/* NFC initial setup */

Trf797xInitialSettings(); //

/*  Selected  ISO14443a NFC standards to read cards*/  

Iso14443aFindTag();  //

After initializing the control is looping in ISO14443IRQWaitTimeout() after writing buf[0] = 0x8F; 0x90; 0x3D; 0x00; 0x0F; command; in function Iso14443a_command().

***********************************************************************************************************/

regards,

Arun soman

Hi Sir,

Thanks in advance..I required details from below link , Firmware pkg and schematic  .Please provide me below details , for me it’s showing requested data not found .

http://www.ti.com/tool/dk-em2-7960r

regards,

Arun soman

Arun Soman said:

/*****************************************************************************************************************

/* // SPI and GPIO setup and configuration.  EN1 and EN2 configuration  */

Trf797xCommunicationSetup(); 

/*/ SPI chip select low */

GPIO_ResetBits(GPIOA, GPIO_Pin_4);  

/* NFC initial setup */

Trf797xInitialSettings(); //

/*  Selected  ISO14443a NFC standards to read cards*/  

Iso14443aFindTag();  //

After initializing the control is looping in ISO14443IRQWaitTimeout() after writing buf[0] = 0x8F; 0x90; 0x3D; 0x00; 0x0F; command; in function Iso14443a_command().

***********************************************************************************************************/

Hey Arun,

Did you get the IRQ firing yet?  If you could include a SPI capture, that would be quite useful.

Thanks,

JD