About LltWc

LltWc · 2025-01-24

I've been implementing Wake Up mode with inductive wakeup on the ST25R3916 with custom firmware. It's all functioning as expected, except for the oscillator interrupt.As seen in the logs below, when I switch to Wake Up mode, I mask every IRQ except I...

LltWc · 2025-01-16

Where can I find details on inductive sensor wakeup for the ST25R3916? It's only even mentioned on pages 1 and 11 of the datasheet. My understanding is that inductive wake-up will detect tags only, whereas capacitive will detect other objects like a ...

LltWc · 2025-01-16

I'm adding Power-Down mode to my Listen Mode implementation, and have come across some unexpected behavior.I keep the chip in Power-Down, with the field detector set to automatic, and then see EON when a field is detected, as expected. The first time...

LltWc · 2024-12-18

I've been seeing some unexpected failure modes while reading T2Ts with an ST25R3916. Every ~300ms, the device sends a wake request, and if a tag is detected, goes ahead with the reading process. If a tag is detected and an error occurs anywhere in th...

LltWc · 2024-12-03

I'm trying to figure out some unexpected behavior (that I've posted about before) after successfully implementing alternation between T2T Card Emulation and Reader/Writer such that they seem simultaneous to the end user.During device initialization, ...

LltWc · 2025-01-27

Yes, thank you, I'm aware that the bit will still be set. The IRQ readout in the log I posted only occurs when the IRQ line is set high, every 100ms, and you can see that the only bit set is the I_OSC bit. I don't see any way to interpret the behavio...

LltWc · 2025-01-27

Hi Brian, yes, I am aware that the oscillator is enabled in order to take inductive measurements. Why is the interrupt still being raised when I have the mask set?

LltWc · 2025-01-17

Got it. For others' reference, both phase and amplitude wakeup are inductive wakeup.

LltWc · 2025-01-16

Yet another one I solved right after posting!For anyone who comes across the same problem - the issue was that for some reason on the second EON, the OSC interrupt came earlier than the first time, which resulted in it being caught in the main interr...

LltWc · 2025-01-16

FYI - this was specifically a hardware issue, my dev board had wires soldered and resoldered one too many times so it had a few quirks. I no longer see this issue on startup. I do see some other unexpected behavior - putting together a post now.

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I_OSC raised unexpectedly during Wake Up mode

ST25R3916 Inductive Wake-Up

Oscillator interrupt is not raised after Ready -> Power Down -> Ready

Mitigating hard framing and CRC errors in Reader/Writer mode

Unexpected interrupt after Tx enable on ST25R3916

Re: I_OSC raised unexpectedly during Wake Up mode

Re: I_OSC raised unexpectedly during Wake Up mode

Re: ST25R3916 Inductive Wake-Up

Re: Oscillator interrupt is not raised after Ready -> Power Down -> Ready

Re: Unexpected interrupt after Tx enable on ST25R3916