TIDM-TM4CFLASHSRAM: Storing and accessing data in Parallel flash in linker script .cmd file

Tool/software:

Hello Team,

We're planning to use TM4C with external memory devices as in TIDM-TM4CFLASHSRAM EVK.

We need to store large number of data which will be transferred in chunks via SPI to an FPGA. As the SRAM memory isn't sufficient for our application, we need to store it in Parallel Flash or external SRAM.

Being a beginner to this linker script topic, i'm not sure how to handle this in the .cmd file itself.

Can you please tell how to store the data in external parallel flash and access the same data from the application code?

Thanks in advance.

10 months ago

0 Charles Tsai 10 months ago

TI__Guru**** 191906 points

Hi,

Please refer to this post to download the software collateral for TIDM-TM4CFLASHSRAM. The example code has the linker command file.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1295494/tidm-tm4cflashsram-sample-code/4915755?tisearch=e2e-sitesearch&keymatch=%2520user%253A583941#4915755

0 Mp 10 months ago in reply to Charles Tsai

Intellectual 350 points

Hello Charles,

In this .cmd files the SRAM/Flash address isnt directly initialized. This code has its data initially in the Microcontroller's SRAM and then moved to external SRAM/FLASH. Correct me if i'm wrong.

But my requirement is to directly store the data to the external memory device while building the code itself.

Thank you

0 Charles Tsai 10 months ago in reply to Mp

TI__Guru**** 191906 points

Hi,

Mp said:
In this .cmd files the SRAM/Flash address isnt directly initialized. This code has its data initially in the Microcontroller's SRAM and then moved to external SRAM/FLASH. Correct me if i'm wrong.

That is correct. You need to initialize the EPI module for Host-16 mode mode before you can access the memory connected to EPI interface.

Mp said:
But my requirement is to directly store the data to the external memory device while building the code itself.

As explained above, until the EPI module is initialized the boot code has no understanding that an external memory is available.

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TIDM-TM4CFLASHSRAM: Storing and accessing data in Parallel flash in linker script .cmd file