SAMD21 Software Reset

Official Hardware Classic Zero
1

Hi,
I have the following code to reset my SAMD21. That also works very often. Only sometimes nothing happens and the SAMD21 continues to run. Do I have to pay attention to something else?

        // Disable all interrupts
        __disable_irq();
        NVIC_SystemReset();
        while (true);
2

Hi rsardu,

If your using the RTC, to put the SAMD21 to sleep for example, then this might be a factor since the RTC is only reset by power-on reset.

Upon start-up it's possible to determine the cause of the reset, either power-on, external, or system (software) by reading the Power Manager's RCAUSE register:

if (PM->RCAUSE.bit.SYST)   // Check if a system (software) reset has occured?
{}

Might I ask how you're detecting whether the microcontroller continues to run or resets?

3

Hi Martin,
I just want to make sure my MCU resets safely. I don't even want to know why afterwards. But you gave me another idea: I didn't even know that the SAMD had a clock! I wanted to build a clock module for it. I can save that now. And there is even a nice lib for it:

Thank you very much!

4

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