About LltWc

LltWc · 2024-08-29

As we've been integrating the ST25R3916 into our final hardware, there's been an issue with the Adjust Regulators command. On external supply power, the command works without any problems. On some (not all) of our battery-powered units, as tested in ...

LltWc · 2024-07-15

I'm working on getting the ST25R3916 to communicate with an NTAG215 on the target application, and had it wired up with the antenna today. When I send a measure amplitude command, I get 89 = 1.159 Vpp without a tag in the field (the same value I got ...

LltWc · 2024-06-28

I'm working on porting the RFAL for ST25R3916B to an nRF5340, using the pairing example for X-NUCLEO-8. I have it all compiling and flashing correctly, but things break down during initialization here:In rfalInitialize() -> st25r3916Initialize(), the...

LltWc · 2024-06-18

Is there any example code for ISO14443A passive target mode, which is supported on the ST25R3916B? I'm prototyping basic functionality before fully implementing our application, and it would be nice to do a proof of concept without having to grapple ...

LltWc · 2024-06-03

I'm working on writing drivers to use an ST25R3916B to interface with a non-ST host chip as an NFCIP-1 passive communication initiator. I've made progress on the communication to establish an active connection to a tag, but one part I'm stuck on is ...

LltWc · 2024-09-05

That's correct, I'm using Nordic's command_process functions from its ST25R3911B example code, so step 16 includes unmasking l_dct, sending the Adjust Regulators command, waiting 10ms, then if the IRQ comes in, reading the IRQs, masking l_dct, and th...

LltWc · 2024-09-03

We're using the ST25R3916, not the -B version, and our own firmware, not the RFAL.I do have it toggling reg_s, we didn't previously but I added that while trying fixes.The en bit is set, the oscillator start process completes successfully before atte...

LltWc · 2024-07-17

Understood, thanks. I tried a different, external antenna and got the expected response, so now the work is in antenna tuning so that the target device can initiate properly.

LltWc · 2024-07-15

Thanks - I'm working on setting up a spectrum analyzer now and will post results when I can.What do you mean by "potentially decode a tag answer"? This is a tag that I know works; what does the measurement represent if not the power harvested by the ...

LltWc · 2024-07-01

Hi Ulysses,I think you're right, but it's not (directly) about the missing CS positive pulse. Here's where I'm at:The host sends a 0x42 to read register 02.An IRQ is sent.The host sends a 0x5A to read this IRQ. Instead of a 0x00 from the ST25 as usua...

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ST25R3916 Adjust Regulators not completing without a tag in the field

ST25R3916 transferring power but not communicating

ST25R3916B + RFAL does not specify/clear an interrupt after Measure Power Supply command

ST25R3916B Passive Target Sample Code

ST25R3916 Select/SEL_REQ CL1 values

Re: ST25R3916 Adjust Regulators not completing without a tag in the field

Re: ST25R3916 Adjust Regulators not completing without a tag in the field

Re: ST25R3916 transferring power but not communicating

Re: ST25R3916 transferring power but not communicating

Re: ST25R3916B + RFAL does not specify/clear an interrupt after Measure Power Supply command