TMS320F28374S: usage of read functions from C2000 F021 Flash API Version 1.53

Xin,

Note that Flash API version 1.55 is used for TMS320F2837xS.  F2837xS Flash API documentation link: http://www.ti.com/lit/pdf/spnu630.

Flash API version 1.53 is used for TMS320F28M35x and TMS320F28M36x devices (http://www.ti.com/lit/pdf/spnu595).

Coming to your questions:

Question 1). If you want to read raw data without ECC correction, you need to disable SECDED logic in Flash wrapper by writing a value of 0 to ECC_ENABLE register (please refer to TRM for details of this register) before reading the Flash/OTP.

Flash API does not provide a function to read the raw data from Flash/OTP/ECC since users can write a simple function to accomplish it.

Please note that the read margin modes are not supported in F2837xS device and hence Fapi_doMarginRead() function is not supported. Hence, you don't find related information in the TRM. We are about to release an updated Flash API reference guide to remove the references of read margin modes. Sorry for the confusion.

Question 2). Now, you know that read margin modes are not supported for this device.

Question 3). You can use Fapi_calculatePsa() function from API library to calculate the PSA. Note that this function does not support ECC memory space. You can use it for Flash main array or OTP but not for ECC space.

Flash API (F021_API_F2837xS_FPU32.lib) for F2837xS device can be found at:
\controlSUITE\device_support\F2837xS\v210\F2837xS_common\lib.

Flash API usage example for F2837xS device can be found at:
controlSUITE\device_support\F2837xS\v210\F2837xS_examples_Cpu1\flash_programming

Let me know if you have any questions.

Thanks and regards,
Vamsi

Hi Vamsi,

I will use AutoEccGeneration mode to program main memory and associated ECC memory.

But I want to verify the raw data in main memory and ECC memory.

So I should calcute the ECC.

Thanks~ 

Best regards~

XIn

Hi,Vamsi,

Thanks for your help.

I find another issues.

Q1:Use Fapi_issueProgrammingCommand() to program flash and flash ECC by Fapi_AutoGeneration mode

for parameter u16DataBufferSizeinBytes[in]:One byte equal to 16 bits.

for parameter u16EccBufferSizeinBytes[in]:How many bits euqal to one byte?

Q2:Use Fapi_issueProgrammingCommand() to program flash and flash ECC by Fapi_AutoGeneration mode

Sector A and SectorA associated ECC can not be programmed.

Would you give some advise?

Q3:Use Fapi_issueProgrammingCommandForEccAddress() to program ECC 

for parameter u8EccBufferSizeInBytes[in]: Is one byte euqals to 8bits?

Q4:Use Fapi_issueProgrammingCommandForEccAddress() to program ECC

SectorA associated ECC can not be programmed.

Would you give some advise?

Thanks~

Best regards~

Xin

Xin,

1) 

u16DataBufferSizeInBytes -> number of 16-bit words in the Data buffer

u16EccBufferSizeInBytes  -> number of 8-bit bytes in the ECC buffer

2) What error did you get when you program Sector A and its ECC?  Did you check whether it is erased or not before you program?

3) Fapi_issueProgrammingCommandForEccAddress() is not supported for F2837x devices.  Since you program using AutoEccGeneration mode, you don't need Fapi_issueProgrammingCommandForEccAddress() function.  Please refer to Flash API reference guide for this device at http://www.ti.com/lit/pdf/spnu630
 

Thanks and regards,

Vamsi   

Hi,Vamsi,

For Item 2)

I program the sectorA with non-blank value.But the read back value are all blank vlaue(all ones).I am sure that I have done sector-erase&blank before program.

It is a strange thing that other sectors except SectorA&SectorA-ECC can be programmed successfully .To verify it,I have read all the raw data including main flash and associated-ECC.The result is that only Sector A and associated ECC can not go through the verify issue. 

I do not know why?

I have attached more information about how I operate  TMS320F28374s below:

Thanks~

Best regards~

XIn

Flash API:

controlSUITE\device_support\F2837xS\v210\F2837xS_common\lib\F021_API_F2837xS_FPU32.lib

Hi,Vamsi,

Every thing is ok.

Thank you very much.

Best regards~

Xin

Xin,

Glad that the application is working now after removing the erase debug code.

I am closing this thread now.

Thanks and regards,

Vamsi

Hi,Vamsi,

    I found another problem.

    Please help check it.

   When I program 0x78018-0x7801F(Bootctrl area),I got the error code:Fapi_Error_InvalidAddress(507).But I do not think there is any error about the program address.

   Woud you have any idea?

  Thanks~

  Best regards~

Xin

Hi,Vamsi,

   Do you recommand this way "Fapi_issueProgrammingCommand((INT32U*)devaddr,(uint8 *)p16data,4,0,0,Fapi_AutoEccGeneration)" or this way "Fapi_issueProgrammingCommand((INT32U*)devaddr,(uint8 *)p16data,8,0,0,Fapi_AutoEccGeneration)" to program flash?

   The first way can bypass program when 64bits data are all ones.

   The second way can bypass program when 128bits data are all ones.

    Thanks~

Best regards~

Xin

Ajit,

Yes, it should work. Let me know if you see any issues.

Thanks and regards,
Vamsi

Dear Vamsi,

maybe it's trivial but I spent a lot of time trying to figure out how to read from flash memory.

Can you place here an example on how access to the memory to read a given written on flash? That would be great. 

Thank you very much.

Andrea

Andrea,

This thread went through several phases and hence it would be tough for others to learn from it if we add further. 

Please open a new thread as I suggested to Ajit earlier in this thread. 

Thanks and regards,
Vamsi