TMS320F280049C: TMS320F280049C device unlocking issue

Hi Akshay,

Have you always gotten this error with this device? Or did this only start happening after you attempted to program something in flash or RAM?

Thank you,

Luke

Hi Luke,

Thank you for your reply.

I have programmed numerous example projects into RAM and Flash without any issues. However, after flashing an old project from a different development team—which was programmed successfully—I am now encountering this error.

Best Regards,

Akshay

Can you send a screenshot of the memory browser starting at address 0x78000? I would like to evaluate whether there are any irregular values programmed at these locations.

Thank you,

Luke

Here it is:

Thank You,

Akshay

Based on this the device should be unlocked after reset. Do you have any source files for the project that caused this error? If you attempt to flash the device with the projects that work successfully, are you able to program, or this the device permanently unable to be reflashed?

Thank you,

Luke

Other programs work successfully. I have attached part of the code related to the code security module. 

//****************************************************************
//  Interface Function: PRG_unlock()
//
// Unlock the Code Security Module.
//
// Parameters:
//
// Return Value:
//
// Notes:
//-------------------------------------------------------------------

#pragma CODE_SECTION(PRG_unlock,"FlashBoot");

void PRG_unlock(void)
{
    volatile  Uint32 temp;
    volatile Uint32 *CSMPWL = (volatile Uint32 *)0x78028; //CSM Password location

    // Read the 128-bits of the CSM password locations (PWL)

    temp = *CSMPWL++;
    temp = *CSMPWL++;
    temp = *CSMPWL++;
    temp = *CSMPWL++;

    // Write the 128-bit password to the CSMKEY registers
    // If this password matches that stored in the
    // CSLPWL then the CSM will become unsecure. If it does not
    // match, then the zone will remain secure.

    DcsmBank0Z1Regs.Z1_CSMKEY0 = 0xFFFF55AA;//0xFFFFFFFF;//
    DcsmBank0Z1Regs.Z1_CSMKEY1 = 0x47FFAA55;//0xFFFFFFFF;//
    DcsmBank0Z1Regs.Z1_CSMKEY2 = 0xFFFF5A5A;//0xFFFFFFFF;//
    DcsmBank0Z1Regs.Z1_CSMKEY3 = 0xFFFFA5A5;//0xFFFFFFFF;//
}