TMS320F28379D: Reading data from FLASH

Sinan KAMILCELEBI

Intellectual 520 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hi:

I am writing data to FLASH using the example below.

C:\ti\c2000\C2000Ware_3_04_00_00\device_support\f2837xd\examples\dual\flash_programming

The this data I wrote to FLASH is as follows:

struct MDATA
{
    int PG;
    int IG;
    int IL;
    int ID;
    int DG;
    int DW;
    int FF;
    int FFA;
    int TL;
    int FB;
};

I can't read this data I wrote to FLASH? I want to read this data I wrote to FLASH and assign it to the variables I defined.

Sinan,
Thanks,

Good days.

over 4 years ago

0 Anu Biradar over 4 years ago

TI__Expert 5630 points

Hi Sinan,

Data from Flash can be read just like RAM.

Please make sure to configure the wait-states correctly as per the operating frequency (check datasheet flash parameter spec).

Thanks,

Anu

0 Sinan KAMILCELEBI over 4 years ago in reply to Anu Biradar

Intellectual 520 points

Hi, Anu:

I checked the FLASH parameter specification in the datasheet. No error appears. I tried many things. However, I still cannot read data from FLASH.

The data I write to FLASH and want to read is as follows:

Buffer[0] = 0x1234;
Buffer[1] = 0x5678;
Buffer[2] = 0x90ab;
Buffer[3] = 0xcdef;
Buffer[4] = 0x1122;
Buffer[5] = 0x3344;
Buffer[6] = 0x5566;
Buffer[7] = 0x7788;

Can you review the code below that I've included in this post?

/cfs-file/__key/communityserver-discussions-components-files/171/7416.flash_5F00_programming_5F00_cpu01.c

Thanks and best regards,

Sinan.

0 Anu Biradar over 4 years ago in reply to Sinan KAMILCELEBI

TI__Expert 5630 points

Sinan,

Are you able to see the contents of the buffer written into Flash if you look in the memory window?

Thanks,

Anu

0 Sinan KAMILCELEBI over 4 years ago in reply to Anu Biradar

Intellectual 520 points

Hi, Anu:

I cannot see the contents of the buffer written to FLASH in the memory window.

Sinan KAMILCELEBI said:
Can you review the code below that I've included in this post?

/cfs-file/__key/communityserver-discussions-components-files/171/7416.flash_5F00_programming_5F00_cpu01.c

Is the C2000Ware_3_04_00_00 instance faulty?

Sinan.

0 Anu Biradar over 4 years ago in reply to Sinan KAMILCELEBI

TI__Expert 5630 points

Sinan,

It looks like you are trying to read the locations before writing to them?

Are you able to run the example without the additions you made? It should work. For the additions you are making, can you first try writing and then reading after all the Flash initializations are complete e.g. FlashInit, Flash API Init, setting Flash Bank active and see if it makes a difference.

Thanks,

Anu

0 Sinan KAMILCELEBI over 4 years ago in reply to Anu Biradar

Intellectual 520 points

Hi, Anu:

The example doesn't work either without my additions.

I'm trying to read the data after writing it to FLASH.

My code is below:

/cfs-file/__key/communityserver-discussions-components-files/171/2728.flash_5F00_programming_5F00_cpu01.c

Could you ask another TI FLASH expert about this problem?

Sinan.

0 Anu Biradar over 4 years ago in reply to Sinan KAMILCELEBI

TI__Expert 5630 points

Hi Sinan,

I will review this file and get back to you, in the mean time please take a look at the following:

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/951668/faq-faq-on-flash-api-usage-for-c2000-devices

Thanks,
Anu

0 Sinan KAMILCELEBI over 4 years ago in reply to Anu Biradar

Intellectual 520 points

Hi, Anu:

Were you able to examine the snippet of code I shared with you? Is there any progress in solving this problem?

Anu Biradar said:
I will review this file and get back to you, in the mean time please take a look at the following:

Sinan,
Thanks and best regards.

0 Anu Biradar over 4 years ago in reply to Sinan KAMILCELEBI

TI__Expert 5630 points

Sinan,

It looks like the majority of the file is the same as the flash programming example, with only the additions Flash read function and the Buffer array starting at line 317. What is your clock source? Is the PLL being configured with the clock source you have for your device?

Thanks,

Anu

0 Sinan KAMILCELEBI over 4 years ago in reply to Anu Biradar

Intellectual 520 points

Hi, Anu:

Anu Biradar said:
What is your clock source?

My device clock source is 200 MHz. (u32HclkFrequency = 200 MHz)

Anu Biradar said:
Is the PLL being configured with the clock source you have for your device?

Yes. I am configuring the PLL circuit with the clock source my device has.

Sinan.

0 Anu Biradar over 4 years ago in reply to Sinan KAMILCELEBI

TI__Expert 5630 points

Sinan,

More specifically, are you using the internal or external oscillator to generate the 200 MHz clock? The examples are generally configured to use the external oscillator, if you are using the internal oscillator, the clock configuration in the example needs to be changed accordingly so that the example uses it to generate the desired clock frequency.

The reason I am asking about the clock source is because you mentioned that even without any additions, the example does not work for you, so I think that it could be the cause of the issues you are facing.

Thanks,

Anu

0 Sinan KAMILCELEBI over 4 years ago in reply to Anu Biradar

Intellectual 520 points

Hi, Anu:

Anu Biradar said:
More specifically, are you using the internal or external oscillator to generate the 200 MHz clock?

I am using TMDSECATCNCD379D development kit. There is 25 MHz CRYSTAL on this kit.

I don't think the clock source could be the cause of this problem. Because I am using TI development kit.

Can TI device have a Silicon Errata condition?

Sinan,
Thanks.

+1 Vamsi Gudivada over 4 years ago in reply to Sinan KAMILCELEBI

TI__Guru* 87155 points

Sinan,

I looked at your code.

The example is programming sector C and then it is also erasing that sector. Hence, the programmed data gets erased.

You might want to erase, program and then read (without an erase after the program).

Please note: Anu is out of office and will be back next wednesday. If you have further questions, please expect a reply mid next week from us.

Thanks and regards,

Vamsi

0 Sinan KAMILCELEBI over 4 years ago in reply to Vamsi Gudivada

Intellectual 520 points

Hi:

Vamsi Gudivada said:
Hence, the programmed data gets erased.

I didn't notice this detail in the code.

Thank you very much for your feedbacks.

My problem solved. I am thankful to you.

I will close this post case later. However, I have another question for you regarding this matter. I have many my data to write to EEPROM. Should I use the DSP's FLASH or an external EEPROM chip? Also what is the write life of the FLASH area of the DSP?

Sinan,
Thanks and best regards.

0 Vamsi Gudivada over 4 years ago in reply to Sinan KAMILCELEBI

TI__Guru* 87155 points

Sinan,

Glad it helped.

Regarding the write/erase spec, please see below snapshot taken from the datasheet.

Regarding your EEPROM query: We do not have a EEPROM driver example for this device. However, you can program the flash using the flash API as needed. Note that you need to program at least 64-bits (minimum) since ECC is calculated for every 64-bits aligned on the 64-bit boundary.

Thanks and regards,
Vamsi

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28379D: Reading data from FLASH