TMS320F28377S: Flash API Fapi_doVerify fails

Hello,

I try to write some data into the Flash, using the Flash API from C2000. When I want to verify the data which was written into the flash, I came across a strange phenomenon. Here is my code.

I have a global structure called blFlags with dummy data, which should be written into flash. (The structure is again in another structer, but I left it out for the sake of simplicity).

struct STRUCT_bootloaderFlags
{
    uint16_t appFlag;       // = 0xFFFF
    uint16_t backupFlag;    // = 0xFFFF
    uint16_t flashError;    // = 22
    uint16_t RS485Error;    // = 44
    uint16_t rsvd_1;        // = 1
    uint16_t rsvd_2;        // = 2
    uint16_t rsvd_3;        // = 3
    uint16_t rsvd_4;        // = 4
};
struct STRUCT_bootloaderFlags blFlags;

At first, I initialize the API as described in the Flash API Manual with Initializing the Flash Bank, Fapi_initializeAPI(), Fapi_setActiveFlashBank(). All functions are placed in the RAM.
Then I write the data with this code.

// Issue program command
oReturnCheck = Fapi_issueProgrammingCommand((uint32_t *)BOOTLOADER_FLAGS_START_ADDRESS, (uint16_t *)&objFlash.blFlags, 8, 0, 0, Fapi_AutoEccGeneration);

// Wait until the Flash program operation is over
while (Fapi_checkFsmForReady() != Fapi_Status_FsmReady)
if(oReturnCheck != Fapi_Status_Success)
{
    objFlash.error |= ERROR_FAPI_WRITEFLAG;
}

If I do now a CPU-read of the flash-address, I can see that the values are correct. However, if I use the Fapi_doVerify() function, it gives me a failure. I tried some different settings and I was able to narrow the problem down to two function calls, where one works and the other does not.

Fapi_StatusType oReturnCheck;
Fapi_FlashStatusWordType oFlashStatusWord_1, oFlashStatusWord_2;

uint16_t tempDataBlock[8];
uint32_t *tempPtr;


memcpy((uint16_t *)&tempDataBlock, (uint16_t *)&objFlash.blFlags, sizeof(tempDataBlock));


tempPtr = (uint32_t *)&tempDataBlock;           // = 0x00000438
oReturnCheck = Fapi_doVerify((uint32_t *)startAddress, 4, tempPtr, &oFlashStatusWord_1);  // Works


tempPtr = (uint32_t *)&objFlash.blFlags;        // = 0x0000A813
oReturnCheck = Fapi_doVerify((uint32_t *)startAddress, 4, tempPtr, &oFlashStatusWord_2);  // Do not work

The return values in oFlashStatusWord of the function which is workung gives 

oFlashStatusWord_1.au32StatusWord
[0] 0x00000000
[1] 0x00100002
[2] 0x0005F8A0
[3] 0x0005F890

and the one which fails is

oFlashStatusWord_2.au32StatusWord
[0] 0x00082000      // address of first non-blank location
[1] 0xFFFFFFFF      // data read at first verify failure location
[2] 0xFFFF0000      // value of compare data
[3] 0x00000000      // N/A

So as I interpret it, the function has problems reading from the global structure. Is this possible or have I another mistake?

Of cource I would like to avoid the memcpy() funcition and read directly from the structure, to speed things up.

I hope someone can help me with this. Thanks already in advance.

Best regards,

Simon