*** error 65: access violation at 0x40023800 : no 'read' permission

Posted on April 03, 2013 at 14:15

I have successfully run some of the simple demos on the STM32F4Dsicovery board but when I try a couple of the usart examples I get this message in debug mode:

*** error 65: access violation at 0x40023800 : no 'read' permission

the location is this line:

  /* Reset the RCC clock configuration to the default reset state ------------*/

  /* Set HSION bit */

  RCC->CR |= (uint32_t)0x00000001;

I have the same debug setting sas before ie. ST-Link Debugger, Port=SW,SWDIO = 0x2BA01477 ARM Coresight SW-DP and on the Utilities the Programming Algorithm is:

STM32F4xx Flash On-chip Flash 1M 0800000H - 080FFFFFH

I now also get the same debug message when I go back to the previous working Flash LED examples.

Thanks in advance

#keil-debugger #usart-stm32f407 #keil-simulator