- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Hi,
I am using the controlCARD board (TMDCNCD28388D) and trying to write one 16-bit word of "0xFFFF" on a part of the flash memory. Then, I try to use the "Fapi_doBlankCheck" function to check whether this specific part of the memory (that I wrote 0xFFFF on) is blank (erased) or not. However, in this situation, when I read the output of this function, it says this part of the memory is not blank (erased state) while it actually has the value of 0xFFFF. So, it seems that this function only detects the fact that whether the flash is erased or not while it does not tell us anything about the fact that whether we can write on that part of the memory or not. I know that from the perspective of the Flash API, it is not a blank area because a value of 0xFFFF has already been written on that area. But, for my application, even this area with written 0xFFFF on them could be considered as the blank areas that have the capability of being written on them. So, is there any function or a way in the Flash API that I can use to detect the "erased and writable" part of memory?
Kind Regards,
Alex
Hi Vamsi,
Thank you for your reply. On the flash of CPU1, the address and length that I passed are 0x08000 and 1 bytes, respectively. I try to write the following array on the address 0x80000 of flash memory:
uint16_t data[8] = {0x0001, 0x0002, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
The picture below is a snapshot of memory when writing the array "uint16_t data[8]":
And then use the blank check function as the following (for addresses 0x80001, 0x80002, and 0x80008):
address = 0x80001;
oReturnCheck_0 = Fapi_doBlankCheck((uint32_t*)address, 1, &oFlashStatusWord_0);
address = 0x80002;
oReturnCheck_1 = Fapi_doBlankCheck((uint32_t*)address, 1, &oFlashStatusWord_1);
address = 0x80008;
oReturnCheck_2 = Fapi_doBlankCheck((uint32_t*)address, 1, &oFlashStatusWord_2);
As for the results, the function says the address 0x80001 is not blank but addresses 0x80002 and 0x80008 are blank. Then, I try to write a value on the address 0x80002 (which the blank check function has already confirmed that it is erased or blanked). However, after doing this, I can see that there is nothing has been written on that the 0x80002 of the memory. More specifically, I get the "Fapi_Error_AsyncIncorrectDataBufferLength" error from the write operation.
Best,
Alex
Vamsi,
You are not able to program there because you might have programmed ECC using Fapi_AutoEccGeneration. Even though the data is 0xFFFF, you might have programmed ECC - after programming ECC, you won't be able to program the data unless you are changing 1 -> 0 through your program command.
Thanks for the explanation. Yes, I have exactly done the program command using "Fapi_AutoEccGeneration". Now, it is clear to me. So, can you please mention how I can use change the ECC from 1 -> 0? I can also see in the code that there are other types of program commands. Are these might be related to my issue as well? I mean should I change the program command that I use for the write operation to solve this issue?
Regarding the error that you got: You might have given a wrong data length for the given address - this is why I asked you to review that FAQ. Can you tell the address and the length of the data that you used?
The address is 0x80002 and the length of the data is 8.
Best,
Alex
