TMS570LC4357: TMS570 NMPU external diagnostics test

dhana lakshmi1 said:

MPUDIAGADDR register

This is the address in the region you want to test.

Here is an example I just developed for you:

nmpu_dmaREG->MPULOCK = 0x0A; //Writes to other MPU registers are allowed
nmpu_dmaREG->MPUCTRL1 = 0x5; //Memory protection is disabled

nmpuRegionAttributes_t nmpuConfig0;
nmpuConfig0.accesspermission = NMPU_PRIV_RW_USER_RO;
nmpuConfig0.regionsize = NMPU_SIZE_4_KB;
nmpuConfig0.baseaddr = 0x08030000;

nmpuEnableRegion(nmpu_dmaREG, NMPU_REGION0, nmpuConfig0);

nmpuRegionAttributes_t nmpuConfig1;
nmpuConfig1.accesspermission = NMPU_PRIV_RO_USER_RO;
nmpuConfig1.regionsize = NMPU_SIZE_4_KB;
nmpuConfig1.baseaddr = 0x08031000;

nmpuEnableRegion(nmpu_dmaREG, NMPU_REGION1, nmpuConfig1);

nmpu_dmaREG->MPULOCK = 0x0A;

nmpu_dmaREG->MPUDIAGCTRL = 0 << 18 //treat transaction as user mode
| 1 << 17 //treat transaction as write
| 0 << 16 //internal diag mode
| 0xa << 4; //enable diag

nmpu_dmaREG->MPUDIAGADDR = 0x08031008;

In this example, I enabled 2 UMPU regions for DMA. The end region (#1) is from 0x08031000 to 0x08032000, size=4KB, permission is read-only for pri and user.

The diagnostic is configured as write access to 2nd region at 0x08031008 in user mode which violates the permission.

Bit 27, 25, 16, and bit 0 are set. 

Hi Wang,

Thank you so much for providing example code and all the details. This code example configured for internal diagnostic mode. I have tried this mode and works fine. when tried to configure for external diagnostic mode(updated bit 16 as 1 in MPUDIAGCTRL ) and initiated dma transaction(i see data is transferring from source to destination), no fault is logging in MPUERRSTAT as expected. This register value is 0. 

I have configured as below. Following all steps mentioned in section section 11.3.2.2. Could you please help to provide reference code for external diagnostic mode if available. 

nmpuRegionAttributes_t region1Attributes;
region1Attributes.baseaddr = 0x08067000;
region1Attributes.regionsize = NMPU_SIZE_4_KB;
region1Attributes.accesspermission = NMPU_PRIV_NA_USER_NA;

nmpu_dmaREG->MPUDIAGCTRL = 0 << 18 //treat transaction as user mode
| 1 << 17 //treat transaction as write
| 1 << 16 //external diag mode
| 0xa << 4; //enable diag

Thanks for all your help