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Cortex-M0 initialization | Minimum requirements

Igor

Hi there,

I am on the learning curve of embedded software development with the Cortex-M0. I have a question that has no practical application but for learning purpose. I am interested in the minimal SW requirements to initialize the Cortex-M0 core.

For this question, I define the minimum requirements as those that get the core to a state where the clock tree is running at target frequencies and the core is ready to start configuring the rest of the microcontroller.

Is the following sufficient to get to this stage?

1. Vector table
2. Reset handler

With these two, the stack pointers MSP, PSP, and the clock tree can be initialized.

Is there a case, at this stage, when the NMI or Hard fault handlers or other system handlers may be needed?


Any recommendations for reading on this topic?

Thank you.

Parents
  • 0 in reply to Ronan Synnott

    Hi Ronan,

    Thank your answer. It helps a lot.

    I started with CMSIS and it explains a lot. I came to my question from CMSIS (I have a drawback - I like details). I want to develop a view of what happens at the HW side.

    That might seem like a raw analogy, but to make this view, I see a CPU as a "plant/factory" and its startup procedure:

    1. Power supply -> Stable.
    2. PoR -> Done
    3. "Startup" oscillator -> Drives initialization
    4. Initialization -> Configures "main" clock oscillator and tree
    5. And so on with the focus on the HW block and how it can be done with Assembly.





Reply
  • 0 in reply to Ronan Synnott

    Hi Ronan,

    Thank your answer. It helps a lot.

    I started with CMSIS and it explains a lot. I came to my question from CMSIS (I have a drawback - I like details). I want to develop a view of what happens at the HW side.

    That might seem like a raw analogy, but to make this view, I see a CPU as a "plant/factory" and its startup procedure:

    1. Power supply -> Stable.
    2. PoR -> Done
    3. "Startup" oscillator -> Drives initialization
    4. Initialization -> Configures "main" clock oscillator and tree
    5. And so on with the focus on the HW block and how it can be done with Assembly.





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