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Error: Cannot access target

hamed ad

When debugging STM32L152VD using ST-LINK V2 in Keil. when the program reached the below lines this error appear: "Cannot access target Shutting down debug session."

  GPIOA->MODER   = 0xFFFFFFFF;


or line below

  RCC->ICSCR = tmpreg;


How can I find the source of the problem?

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