About Meixner

Meixner · 2024-11-29

I am trying to enter stop mode 2 and have it woken up by LPTIM1. Now my problem is that stop mode is not entered reliably (or it wakes up too early which I cannot differentiate). The probability stop mode is entered seems to depend on LPTIM1 configur...

Meixner · 2024-08-08

I have got 3 identical boards with STM32u5a5. For improving ADC accuracy I want to calibrate Vref using Vrefint. This is working fine on one board, but on the other two boards Vrefint reads as 0 using the same software. Other ADC channels seem to wor...

Meixner · 2024-07-16

Hello, I have a problem with unaligned access, which generates a hard fault when the software is started without bootloader.When running the same software from mcuboot bootloader, there is no hard fault on unaligned access.The MPU and TrustZone confi...

Meixner · 2024-01-08

I am trying to use TrustZone on STM32U5A9:I am setting up the following regions in SAU:0xc1fe000-0xc1fffff non-secure callable0x8200000-0x83fffff non-secure0x200c0000-0x20273fff non-secure0x60000000-0x6fffffff non-secureAs soon as I flip the enable f...

Meixner · 2023-10-05

I am trying to access a NOR flash via OctoSPI1. CLK is connected to PF4, NCS is connected to PI5. While I can see clock cycles on PF4, PI5 stays high all the time.Does anyone have an idea, what could be wrong?Trust zone is disabled. The register sett...

Meixner · 2025-01-09

I think I have finally found the issue:The problem is if the SysTick interrupt occurs after setting up LPTIM and before entering stop mode. In this case the system wakes up immediately. Since SysTick is not contained in NVIC->ISPR[] but in SCB->ICSR,...

Meixner · 2024-11-29

When it does not enter Stop Mode, it returns immediately.When it enters Stop Mode, power consumption is reduced significantly, which I can measure on the power supply.I have already tested waking up via GPIO. That does work and I see the pending IRQ ...

Meixner · 2024-11-29

Example HAL settings of LPTIM1 when entering stop mode 2 fails reliably:{Instance = 0x46004400, Init = {Clock = {Source = 0, Prescaler = 3584}, UltraLowPowerClock = {Polarity = 0, SampleTime = 0}, Trigger = {Source = 65535, ActiveEdge = 0, SampleTime...

Meixner · 2024-11-29

Repeating the call to HAL_PWREx_EnterSTOP2Mode() when all IRQs are 0 does not help.

Meixner · 2024-08-12

Where would I find 1.6.0?https://www.st.com/en/embedded-software/x-cube-freertos.html lists 1.2.0 as latest release.

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User Activity

STM32u5 does not enter stop mode 2 reliably / wakes up too early

Vrefint reads as 0 on some boards

Hard fault on unaligned access on STM32U5

Enabling TrustZone non-secure internal flash and ram reads as zero from secure state

OCTOSPI: NCS stays high on STM32U5A9

Re: STM32u5 does not enter stop mode 2 reliably / wakes up too early

Re: STM32u5 does not enter stop mode 2 reliably / wakes up too early

Re: STM32u5 does not enter stop mode 2 reliably / wakes up too early

Re: STM32u5 does not enter stop mode 2 reliably / wakes up too early

Re: Vrefint reads as 0 on some boards