Flashing (1 Hz) Red LED

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  • Flashing (1 Hz) Red LED

    Hi,

    I have a JLink Plus V9.3 attached to a new board containing an STM32F746 and the red LED is flashing at 1 Hz. The manual suggests that this is a fatal error. So far things seem to be working correctly. The board brings out trace to the 19-pin Cortex connector.

    Thanks,

    Kenny
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  • Hi Kenny,

    So far things seem to be working correctly

    If everything is O.K., the red LED usually only indicates that the reset pin is driven low on target side. This is unusual for STM32F7 devices.
    Could you describe the flashing? (e.g is it 900ms off and 100ms on? Or 500ms off / 500ms on?)
    Is the flashing immediately gone when disconnecting the J-Link from the target?

    Best regards,
    Niklas
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