S32KのトピックRe: How to Place Custom Data into SRAM for S32K146 Using S32 Design Studio for ARM?

How to Place Custom Data into SRAM for S32K146 Using S32 Design Studio for ARM?

Chandler_L — Thu, 20 Feb 2025 02:35:43 GMT

Hi NXP Support Team: I am currently working on a project using the S32K146 microcontroller and the S32 Design Studio for ARM development environment. I would like to place custom data into SRAM for my application but am unsure of the correct procedure to achieve this. I would appreciate any documentation, examples, or instructions that could help me implement this in my project. Thank you for your time and assistance. I look forward to your response. #S32K

Re: How to Place Custom Data into SRAM for S32K146 Using S32 Design Studio for ARM?

Senlent — Thu, 20 Feb 2025 08:36:46 GMT

Hi@LaiBighead

Please refero to this post, you can use "attribute" to place data to specific address.

https://community.nxp.com/t5/S32-Design-Studio/How-can-S32K-define-a-variable-in-a-specified-address/m-p/731255/highlight/true

Re: How to Place Custom Data into SRAM for S32K146 Using S32 Design Studio for ARM?

Chandler_L — Fri, 21 Feb 2025 06:31:19 GMT

Hi@LSenlent :

I appreciate your help, I have defined a memory region in the linker script with a length of 4 bytes as shown below:

oem_ram (RW) : ORIGIN = 0x20002A0A, LENGTH = 0x00000004

._oem_ram :
{
KEEP(*(._oem_ram ))
} > oem_ram

In (.c) file

uint8_t DID_F183_PRO_CODE[4] __attribute__((section(".oem_did_data_ram_area2"))) = { 0xFF, 0xFF, 0xFF, 0xFF };

However, I am receiving the following error during the build process:

Ld error: region `oem_ram' overflowed by 2 bytes

ECU_APP_DemoProject.elf section `._oem_ram ' will not fit in region `oem_ram'

This suggests that the data segment's actual size exceeds the allocated 4-byte region, causing an overflow. I am unable to understand the exact reason for this overflow, as the data I have defined is just 4 bytes in size.

Could you please help me understand why this overflow is happening and what might be causing the data size to exceed the allocated 4 bytes?

I have a question regarding operations in the .id file. Specifically, I would like to know how to copy a custom Flash data segment to SRAM during startup in the S32K146 environment, using S32Studio for ARM.

In other development environments (such as CodeWarrior), I am familiar with the syntax:

cal_flash: org = 0x00009000, len = 0x00002000

cal_ram: org = 0x40001000, len = 0x00001800

_cal_ram LOAD(ADDR(cal_flash)): {} > cal_ram

Could you please guide me on how to implement this operation in S32K146 using S32Studio for ARM?

Re: How to Place Custom Data into SRAM for S32K146 Using S32 Design Studio for ARM?

Senlent — Mon, 24 Feb 2025 01:54:06 GMT

Hi@Chandler_L

I have told you how to put data in a specified RAM space.

For more syntax rules, please Google it.