About smithderek2000

smithderek2000 · 2024-05-27

Hello, I read through the fairly thorough How To Jump To System Bootloader From Application Code on STM32 regarding entering the bootloader from firmware but I am having an issue getting USART1 to work after the software jump.Code is below. I am ab...

smithderek2000 · 2024-04-19

Hello, I have a ST25R3916B project that is working fine, largely based around the demo_polling.c application. We use one '3916B and switch between different antennas. Each time we switch obviously the RF characteristics change a little, so I'd like...

smithderek2000 · 2024-03-26

Hello, I have one ST25R3916B that feeds a few antennas spread out over 23 inches of length, using relays so that only one antenna is connected at a time. The ST25R3916B is located in the middle of the length. Traces are 20mil wide with ground plan...

smithderek2000 · 2023-12-28

Hello, I have several boards to design where we can fit everything into the STM32F103. We don't need USB, CAN, or Ethernet. However, the price for the '103 isn't that different from the '403 or the '722. So for a brand new project which family would ...

smithderek2000 · 2023-05-19

Hello, I'm working on a product that needs sixteen antennas, so we're looking at using the ST25R391x series but have it be single ended, with each output going to a 1:8 antenna MUX. I have the multiplexer to test but first need to get single ended ...

smithderek2000 · 2024-05-27

I know this is old, but this just saved me - I had USB plugged in but was trying to use USART for bootloader and it wasn't working. Unplugged USB and it worked.

smithderek2000 · 2024-04-30

Hello,I read through AN5322 and it mentions the struct but gives no example or units of what the values should be. We're using the 5 variable capacitor topology in x-nucleo-nfc08a1 with the LXRW0YV201-059 (100pF - 200pF) variable capacitors. The str...

smithderek2000 · 2024-04-22

Hello, In looking at the waveform, how can I tell which is from the tag vs. which is just the excitement signal from the reader? Also, I read through AN5276, but how can I verify that my antenna is correct?The system was working well with one '39...

smithderek2000 · 2024-04-19

To add more detail:a. I did read AN5322 about antenna tuning, but just need more information about how to incorporate into the demo application.b. Hardware follows X-NUCLEO-NFC08A1 with the series and parallel variable capacitors as LXRW0YV202-059 (1...

smithderek2000 · 2024-01-25

I've spent quite awhile on this problem. Ended up using relays but customer didn't like the clicky-clack. Now designing in the TI TMUX6221 / TMUX7221; it's an analog switch that I've tested with the ST25R3911B and it works.The problem with the RF swi...

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Entering Bootloader on STM32F722 - UART works on reboot but not after software jump

How to incorporate ST25R3916B Antenna Tuning into the demo_polling project?

What is the best way to terminate long ST25R3916B antenna traces?

Which STM32F family will have the best long-term availability?

Best way to test st25R3911B single ended configuration on a development board

Re: I'm trying to enter bootloader , Uart , with STM cubeprogrammer, using board is STM32F401 NUCLEO

Re: How to incorporate ST25R3916B Antenna Tuning into the demo_polling project?

Re: What is the best way to terminate long ST25R3916B antenna traces?

Re: How to incorporate ST25R3916B Antenna Tuning into the demo_polling project?

Re: Multiplexing ST25R3911B's antennas in single ended configuration