OTP memory, custom write

Hi All,

I'm having some difficulties with TMS320F280x OTP memory, maybe someone could help me out here.
I'm running my application partly from ram and partly from flash. At boot time I need to check OTP for a valid identifier. If it's not written before (All 0xFFFF) then I need to 'burn' the identifier to OTP.I've tried the following:


    //runs code from ram
    #pragma CODE_SECTION(OTP_VERIFY, "ramfuncs");

    int OTP_VERIFY(void)
    {    Uint16 *OTPMEM=0x003D7800;
        if(OTPMEM[0] == 0XFFFF)
        {
            OTPMEM[0] = 0xFFFE;
            asm(" nop");asm(" nop");asm(" nop");asm(" nop");asm(" nop");
            asm(" nop");asm(" nop");asm(" nop");asm(" nop");asm(" nop");
            return 1;
        }
        return 0;
    }

But nothing is changed here, do I need to unlock OTP or..?


I also tried to use the Flash2809_API_V100.lib for the 2809 running from ram, but it returns error 12 'STATUS_FAIL_ADDR_INVALID.
Writing to flashs ection A-D works fine using the API.

Best regards,

Tjarco Boerkoel