When accessing the register. An interrupt appears.

[profprogrammer]

Hello.

I used MK60DN512.  KSDK 1.2

I want to work with the interface of the RMII.

When accessing the register MMFC

uint32_t* Data_mmfr = (uint32_t *) 0x400c0040;‍
uint32_t tmp = *Data_mmfr;‍‍

That program gets interrupted.

/*
** ===================================================================
**     Method      :  Cpu_Cpu_Interrupt (component MK60DN512LL10)
**
**     Description :
**         This ISR services an unused interrupt/exception vector.
**         This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
PE_ISR(Cpu_Interrupt)
{
  /* This code can be changed using the CPU component property "Build Options / Unhandled int code" */
  PE_DEBUGHALT();
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍

No possibility to read data from MMFR.

Because of what this can happen?

How to fix it?

[danielchen · Accepted solution]

Hi Prof Programmer

This is a normal behavior. You need to enable the ENET module before you can access enet registers, otherwise,  hard fault will happen.

For example, if you put your code in the lwip_httpsrv_bm demo, after netif_set_up(&fsl_netif0);  then it can work.

Have a great day,
Daniel

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