About mete

mete · 2024-09-04

I know TZEN is used to enable TrustZone. At first, this made sense, but now I think about the MCU implementing the Security/TrustZone, and it sounds strange that TrustZone can be disabled. So my question is, what does it really do ? Does it really s...

mete · 2024-02-01

Is it OK to use DWT CYCCNT to count individual instruction cycles when stepping instructions (si) with gdb ? I wonder how many cycles a branch takes when it is taken.

mete · 2024-01-30

On STM32G474, I have a loop where I read ADC values, process them, and write the result to DAC.I am using the dual ADC mode and reading ADC12_COMMON->CDR . I do not care if I read the previous conversion result, in this case, is there a reason to che...

mete · 2024-01-28

In STM32G474.svd version 2.1 that can be download from STM32G474RE product page , WWDG peripheral has no interrupt defined but it is actually the first (0th) interrupt. Is this a mistake or there is a reason behind not defining it in the SVD ?

mete · 2024-01-22

It says "It is crucial that you use a consistent set of versions for the CMSIS Core - CMSIS Device, as mentioned in this release note." but I do not see any CMSIS version in the release notes. Which CMSIS version is recommended for cmsis_device_f3 ?...

mete · 2024-09-05

Not sure if my question is not clear enough. The quote from TRM does not matter but as far as I can see neither TRM nor arch ref manual says security extension can be disabled in an implementation with the security extension."Switch to insecure state...

mete · 2024-09-04

Not sure what is the easiest way to implement this, that is why I wonder, there are probably many details that I cannot think of.Naturally it is not always in the secure state, but there is no concept of "disabling TrustZone", that was my point. The ...

mete · 2024-09-04

More specifically, Cortex-M33 TRM says this (page 22):"When the Arm®v8‑M Security Extension is included in the processor, the programmersmodel includes two orthogonal security states, Secure state and Non-secure state. When theSecurity Extension is i...

mete · 2024-09-04

I know more or less what TrustZone is and how it functions. My question is specifically about what TZEN does. There are non-ST Cortex-M33 MCUs that gives no such option (thus TrustZone is always enabled) and I find it difficult to understand how Trus...

mete · 2024-02-13

The register addresses are in the datasheet but I do not see timestamping is mentioned for IIS2MDC.

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what does TZEN really do ?

using DWT CYCCNT under debugger

overwriting the data registers of the ADC and DAC in STM32G4

WWDG has no interrupt defined in STM32G474 SVD

CMSIS version for cmsis_device_f3

Re: what does TZEN really do ?

Re: what does TZEN really do ?

Re: what does TZEN really do ?

Re: what does TZEN really do ?

Re: why IIS3DWB timestamp values are zero ?