About JDirk.1

JDirk.1 · 2024-03-15

Microcontroller: STM32L051R8Tx (MSI used as system clock, set to 4.194 MHz) Board: custom design (no Nucleo etc.)The LPTIM1 is clocked by an external LSE (32,768 kHz, +- 10ppm).IDE: Keil uVision V5.36.0.0Compiler: ARM Compiler “Use default compiler V...

JDirk.1 · 2024-01-07

Hello,I struggle to use the LSE clock as a source for timer LPTIMER1. My MC is a STM32L051R8Tx and I am using Keil MDK-Lite. ARM Compiler default 5.For debugging purpose I am using the following settings: PSC = 1; ARR = 3275; Interrupt: Auto-reload m...

JDirk.1 · 2023-11-09

Hi all,My aim is to develop an iPhone app with UIKit inXcode using CoreNFC to communicate to a ISO/IEC 15693tag. In particular, to communicate to a ST25DV64K type 5 tag.The data exchange between iPhone and tag is done by usingST25DV64K its fast trans...

JDirk.1 · 2023-04-10

I thought I could send custom commands to the ST25DV Tag by using the NFC Tap app. Is that possible?In the app there are two fields when I chose "Custom":1) Custom Command. There I enter "AC", to Read Message (mailbox).2) Data: what to enter here? Ca...

JDirk.1 · 2022-01-10

An internal voltage regulator allows the external voltage applied on VCC to supply the ST25DVxxKC, while preventing the internal power supply (rectified RF waveforms) to output a DC voltage on the VCC pin.Whats the purpose to output a DC voltage on V...

JDirk.1 · 2024-03-21

Perhaps enable the LSE CSS to see if it's getting tripped. The details on how sensitive the LSE CSS is are lacking, however.-> I will investigate on it as soon as time allows. As it is working now, I need to recover some "lost" time.If the task is ca...

JDirk.1 · 2024-03-18

Many thanks for your reply.I changed the toggling of PIN21 (LED) to the interrupt and I did a couple of random measurements during operation with the handheld oscillometer (see screenshots attached).With function task(g_iterations); included:The time...

JDirk.1 · 2024-03-15

Hello Sarra,many thanks for your quick reply. Could you please become a little more concret? Currently, In the IRQ I do basically three things:1) make sure the interrupt was caused by CNT==ARR, check interrupt source2) clear the interrupt flag of LPT...

JDirk.1 · 2024-01-08

Hi TDK,If this is the case, why is the Reference Manual talking about a special mode using a separate external source (LSE bypass)? I thought this mode is used to add an external clock source of up to 1 MHz. And if you dont use the bypass mode you ca...

JDirk.1 · 2024-01-08

Just to be sure: The LSE crystal is already implemented inside the microcontroller, isn’t it? I didn’t put any additional components to the setup. There is no "crystal arrangement".In RM0377 chapter 7.2.5 I read:“The LSE crystal is a 32.768 kHz low s...

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Interrupt latency, schedule a recurring task, repeat a task

struggle to use LPTIM with LSE clock, timer frequency different by factor of 10 to 32,768 kHz

How to realize >>poll<< cycle as described in AN4910 in swift UIKit?

How to use "NFC Tap" -> "CoreNFC" -> "Custom"

ST25DV: why is a DC voltage delivered on VCC?

Re: Interrupt latency, schedule a recurring task, repeat a task

Re: Interrupt latency, schedule a recurring task, repeat a task

Re: Interrupt latency, schedule a recurring task, repeat a task

Re: struggle to use LPTIM with LSE clock, timer frequency different by factor of 10 to 32,768 kHz

Re: struggle to use LPTIM with LSE clock, timer frequency different by factor of 10 to 32,768 kHz