MPU violation

KrutikaK — Tue, 01 Jul 2025 09:43:30 GMT

Hello,

I am working on the MPU module of S912XEP768BVAG .
I have applied write and execution protection ,but I am not able to get the violation while trying to write or execute at address in between the configured protected range .
CPU User is configured as the master.
Please could you help me in verifying if the below is correct.

Pasting the test code below:

Start address : 0x7E3620 /**< global start address */
End address : 0x7E8595 /**< global end address */

Read only access for CPU user only, writing and execution protection.

/*Test code start*/

FAR_DATA GLOBALADR tUI32 *address_test_gConst = (FAR_DATA GLOBALADR tUI32 *)(0x7E3800);
/*usage in execute testcase*/
funcptr1 funct1_gConst = (FAR_DATA GLOBALADR funcptr1) 0x7E3800;

switch(TestSection_Num)
{
case 1:

AddressUnderTest = 0x7E3800 ;
/*Testcases for MPU testing */
if(Testcase_Num==1)
{
Read_Successful = FALSE;
/* read */
data_read1 = *(FAR_DATA GLOBALADR tUI16*)address_test_gConst;
if(data_read1 == *(FAR_DATA GLOBALADR tUI16*)address_test_gConst)
{
Read_Successful = TRUE;
}
}
else if(Testcase_Num==2)
{
Write_Successful = FALSE;

/*write */
*(FAR_DATA GLOBALADR tUI16*)address_test_gConst =0x1234;

if( *(FAR_DATA GLOBALADR tUI16*)address_test_gConst == 0x1234)
{
Write_Successful = TRUE;
}
}
else if(Testcase_Num==3)
{
Exe_Successful = FALSE;

*(FAR_DATA GLOBALADR tUI16*)address_test_gConst =0x0A00;
funct1_gConst();
Exe_Successful = TRUE;
}
break;
}

/*Test code end*/

Please let know if you need more information from me .

Regards,
Krutika

Re: MPU violation

lama — Tue, 01 Jul 2025 15:14:40 GMT

Hi,

do you think that attached examples will help you to implement MPU?

For more examples from my drawer please visit https://community.nxp.com/t5/S12-MagniV-Microcontrollers/LAMA-s-S12XE-unofficial-examples/ta-p/1100774

Best regards,

Ladislav

topic MPU violation in S12 / MagniV Microcontrollers

MPU violation

Re: MPU violation