OM5577 Tag Emulation Sensitivity

[olegstepanov]

Hello,

I have two OM5577 modules. One is connected to a beaglebone black which is running the NXP image with the sample NFC application. The other is connected to the LPX82x Xpresso development board, onto which I loaded the NXP-NCI sample application. 

When running tag emulation function on the beaglebone, my Android phone picks up the tag successfully at about 1.5" away. However when running the tag emulation test on Xpresso board, I have to practically touch my phone to the antenna. Additionally, in the Xpresso board case, my Android app shows a toast message "Tag detect communication interrupted", even through the debug Console in Eclipse shows that the tag sent data to the phone successfully:

- LISTEN MODE: Activated from remote Reader
--- NDEF Record sent

Questions.

1. Why such a big discrepancy between in tag sensitivity between the two cases. The module is identical. Could it be my power supply (beaglebone uses 2A supply wheres the Xpresso board is hooked up by USB to my PC).

2. Why might my phone not ready the tag fully?

Thanks,

[Kan_Li]

Hi Oleg,

Sorry for the confusion! I just copied the pic from the app note for reference! Please refer to the following for details.

I will send my project to you via case attachment.

Have a great day,
Kan

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[olegstepanov]

Hi Kan,

The problem is not with keep phone steady. I've used contactless many times (we have half a million cards in circulation using our Mifare products)

Yes I got rid of P2P_SUPPORT and RW_SUPPORT, as below (I also tried moving them to Undefined Symbol section). It makes no difference. I also noticed that your IDE is slightly different. For example, I don't see a Symbols category under C/C++ build. 

Can you please send to me your project so that I can run 100% what you are running?

Thanks,

Oleg

[Kan_Li]

Hi Oleg,

Thanks for the update! Actually I just borrowed the Arduino version from another team, and make it work on my side, and the Taginfo running on my phone can read the info as well. I am not sure if you could see the following snapshot during your test, please keep you phone stable when you see it. then you may see the second "--- NDEF Record sent".

Hope that helps,

Have a great day,
Kan

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[olegstepanov]

Hi Kan,

1.

I am using the Arduino-style shield (OM5577/PN7120ARD). I just connected it direct, as shown below. Have you tried it this? Mappings seem right. 

2.

I change the Library setting. But now it I can't flash the application. How do I flash it?

[Kan_Li]

Hi Oleg,

I don't have this version, I just have beaglebone version. and for flash the application, you may just click the debug button as below:

or use the flash programmer:

Hope that helps,

Have a great day!

Kan

[Kan_Li]

Hi Oleg,

The NXP-NCI demo works well on my side, The LPCXpresso824-MAX worked with OM5577 in my test, and Taginfo communicated with this demo. Please refer to the following for details.

and I noticed Taginfo needs some time to parse the NDEF message, so you have to wait for some time till you see the above snapshot if you use Taginfo. I am not sure if your Android App also behaves the same but you may check again on your side.

BTW, the mobile phone used in this test is Huawei Honor 4C CHM-CL00.

Hope that helps,

Have a great day,
Kan

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