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DWT's watchpoint exception can not be issued when interrupt is disabled

sword_i@sina.com

Hi,

    I enabled the DWT's watchpoint functions, and when the watchpoint address is written,

there will be a DebugMonitor exception happens.

   But if the interrupt is disabled(e.g. use __ASM volatile ("cpsid i" : : : "memory");), then

the exception will not happen.

   Can it generate an escalation exception just like other exception, e.g. bus fault?

   My chip is cortex-m33. thanks a lot.

Br,

Yingchun

Parents
  • 0 in reply to 42Bastian Schick

    en, the DebugMonitor trap generated by watch point cannot escalated to a hardfault.

    If a synchronous exception with an equal or lower priority value to execution is pending, the PE hardware escalates
    it to become a HardFault. This rule applies to all synchronous exceptions and DebugMonitor exceptions that are
    caused by the BKPT instruction. This rule does not apply to asynchronous exceptions and all other DebugMonitor
    exceptions.

Reply
  • 0 in reply to 42Bastian Schick

    en, the DebugMonitor trap generated by watch point cannot escalated to a hardfault.

    If a synchronous exception with an equal or lower priority value to execution is pending, the PE hardware escalates
    it to become a HardFault. This rule applies to all synchronous exceptions and DebugMonitor exceptions that are
    caused by the BKPT instruction. This rule does not apply to asynchronous exceptions and all other DebugMonitor
    exceptions.

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