About Jeff Tenney

Jeff Tenney · 2023-04-26

I'm using STM32L486 at 2.5V.The MSI auto calibration feature (aka PLL mode) is crashing at cold temperatures with specific usages of Stop mode. When it crashes, it drives MSI to its minimum frequency for the selected range. For example, the 24 MHz ...

Jeff Tenney · 2022-05-13

I have experienced this issue on STM32L4R and STM32U5. If debugging through STOP mode (with DBGMCU_CR_DBG_STOP set), the flash memory occasionally seems to read out garbage as the MCU is coming out of STOP mode. This typically causes the CPU to har...

Jeff Tenney · 2018-06-25

Posted on June 26, 2018 at 01:53Which pin has the LSCO function on STM32L4R5xx?I can't find it in the documentation. I found MCO available on pin PA8, but can't find LSCO.

Jeff Tenney · 2024-06-27

Hi @waclawek.jan ,No further help from ST beyond this thread. I finally concluded that the MSI in PLL mode has an undocumented minimum allowed run time. The data sheet gives only stabilization times but no minimum run time. Based on the provided s...

Jeff Tenney · 2024-06-19

When you are in RDP Level 1, you will never see secure related information. This is normal behavior.I was on RDP Level 0. I couldn't see the security related options because CubeProgrammer read the option bytes incorrectly during hotplug connect. H...

Jeff Tenney · 2024-06-19

Hello @Jocelyn RICARD and thanks for your reply. Connecting in HOTPLUG mode, option bytes are read to 0. This is not dependent on TZEN nor related to debug in low power modeAgree that TZEN and the debug setting are irrelevant. The real issue is that...

Jeff Tenney · 2024-06-18

I'm not sure what you wanted to achieve by enabling TZ after setting RDP Level 1.In a word, nothing. I'm not even on the product lifecycle yet. I'm just curious about how TZEN works and was experimenting. But I can think we can safely ignore that pa...

Jeff Tenney · 2024-06-17

Hi @Jocelyn RICARD and @MCost.4 I received another U585 IOT kit and did some experimenting. It appears my specific issue is that CubeProgrammer does not handle low-power modes correctly. Here's what it looks like after a hot-plug SWD connect to a t...

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MSI PLL-mode is crashing with use of Stop modes at cold

Waking from STOP mode causes hard fault but only when debugging

Which pin is LSCO on STM32L4R5?

Re: MSI PLL-mode is crashing with use of Stop modes at cold

Re: Trusted Firmware-M v2.1.0 - Bricked Nucleo-L552ZE-Q

Re: Trusted Firmware-M v2.1.0 - Bricked Nucleo-L552ZE-Q

Re: Trusted Firmware-M v2.1.0 - Bricked Nucleo-L552ZE-Q

Re: Trusted Firmware-M v2.1.0 - Bricked Nucleo-L552ZE-Q