topic Re: pn7220 enter loopback mode for Emvco L1 test in NFC

pn7220 enter loopback mode for Emvco L1 test

SeanHu — Mon, 01 Sep 2025 02:03:19 GMT

I am using PN722x on my device, and I want to set nfc into loopback mode by issuing nci command from kernel driver.
Can you provide me the correct nci command that can set pn722x into loop back mode.

Re: pn7220 enter loopback mode for Emvco L1 test

KaiLi — Mon, 01 Sep 2025 07:08:35 GMT

Hello @SeanHu

After finished NFC mw integration, and the device bring up, you can run the application
$./EMVCoAidlHalComplianceTest type ABF
PN7220 should enter EMVCo L1 .

回复： pn7220 enter loopback mode for Emvco L1 test

SeanHu — Wed, 03 Sep 2025 08:50:35 GMT

Hi Kai,

Yes, We followed the Quick start guide and issue the EMVCoAidlHalComplianceTest command, but the PN7220 does not enter loopback mode. That's why I was asking for the NCI command so that we can enter loopback mode manually.

回复： pn7220 enter loopback mode for Emvco L1 test

KaiLi — Thu, 04 Sep 2025 01:43:13 GMT

Hello @SeanHu

Current state on your side, EMVCo has been polling, you can put a card on the RF field, restart another window and check data exchange log,as the below shown:

回复： pn7220 enter loopback mode for Emvco L1 test

SeanHu — Thu, 11 Sep 2025 08:21:47 GMT

Hi KaiLi,
I know that NXP document "PN7220 – Quick start guide" tells us to run the EMVCoAidlHalComplianceTest to enter loopback mode.
But we run EMVCO L1 test script after running EMVCoAidlHalComplianceTest, it shows the device doesn't enter loopback mode.
That's why we want to know how can we enter loopback mode by NCI command.

回复： pn7220 enter loopback mode for Emvco L1 test

KaiLi — Fri, 12 Sep 2025 10:59:17 GMT

Hello @SeanHu

Then you can only use the NfcFactoryTestApp. For the A13/A14/A15 platforms, the code for the NfcFactoryTestApp can be obtained here: nxpnfc_android13/FactoryTestApp at main · NXPNFCLinux/nxpnfc_android13 · GitHub

Then you can refer to Chapter 7 of the PN7160 Android porting guide to build and compile.

However, we still believe that you need to check your system integration.

回复： pn7220 enter loopback mode for Emvco L1 test

KaiLi — Fri, 12 Sep 2025 11:17:19 GMT

Hello @SeanHu

After bulit NfcFactoryTestApp, you can refer the section 13.2 of um11810 PN722X NFC controller to send EMCVO polling command.

回复： pn7220 enter loopback mode for Emvco L1 test

SeanHu — Sun, 21 Sep 2025 13:05:05 GMT

Hi KaiLi

Regarding the data exchange log you mentioned earlier, can you tell me how to confirm through the log whether the device is in loop back mode?

Thank you.

回复： pn7220 enter loopback mode for Emvco L1 test

SeanHu — Mon, 22 Sep 2025 03:02:35 GMT

Hi KaiLi

According to the EMVCoNciR and EMVCoNciX messages in the log I captured, can this log shows that my device was in EMVCo loop back mode?

回复： pn7220 enter loopback mode for Emvco L1 test

KaiLi — Mon, 22 Sep 2025 06:08:36 GMT

Hello @SeanHu

Yes, for example:

回复： pn7220 enter loopback mode for Emvco L1 test

SeanHu — Fri, 26 Sep 2025 02:30:48 GMT

Hi KaiLi,

As you can see in my previous screenshot, we can see that loopback mode NCI command was issued. But our EE reported that the behavior was not correct while they went to FIME to run the EMVCo L1 test.
And they were told that in previous experience, after issue the "EMVCoAidlHalComplianceTest" command, we still need to select the "secondary firmware" item in Cockpit in order to set the NFC into the loopback mode.
And we can only find this item in Cockpit 6.7, but not in Cockpit 8.1 and 8.3..
May I have your professional suggestions on this one？

Thank you.

回复： pn7220 enter loopback mode for Emvco L1 test

KaiLi — Fri, 26 Sep 2025 07:59:48 GMT

Hello @SeanHu

$./EMVCoAidlHalComplianceTest type AB or $./EMVCoAidlHalComplianceTest type ABF has implemented EMVCo loopback application, only calibrating DPC or modify some parameteres will need to use NFC cockpit.