topic Re: SRAM memory reserving in i.MX RT Crossover MCUs

SRAM memory reserving

vijayc1 — Mon, 19 Jul 2021 04:48:04 GMT

Hai im using IMXRT1062 ,i need to reserve SRAM memory of 4kb how to do that and how to read and write on SRAM memory location?

Re: SRAM memory reserving

kerryzhou — Mon, 19 Jul 2021 05:38:21 GMT

Hi @vijayc1

The SRAM you mentioned is the external SRAM chip or the RT1062 internal RAM?

If it is the external SRAM chip, you need to use the SEMC to connect to your external SRAM, you can refer to the SDRAM code, it will remap to the 0x80000000 address, you need to initialize the SEMC with your external memory, then you can access the related address directly.

SDK code:

SDK_2_10_0_EVK-MIMXRT1060\boards\evkmimxrt1060\driver_examples\semc\sdram

Wish it helps you!

Best Regards,

Kerry

Re: SRAM memory reserving

vijayc1 — Mon, 19 Jul 2021 05:43:00 GMT

hai kerry i need it on RT1062 internal RAM.

Re: SRAM memory reserving

kerryzhou — Mon, 19 Jul 2021 05:52:11 GMT

Hi @vijayc1 ，

If you need to use the internal ram, it is more easy, internal RAM contains: 128K ITCM,128k DTCM, 256k OCRAM. different RAM in the different location.

About the operation, you just need to operate the related address is OK.

Which IDE you are using?

If mcuxpresso, you can refer to this post to use the related address:

https://community.nxp.com/docs/DOC-335283

Wish it helps you!

Best Regards,

Kerry

Re: SRAM memory reserving

vijayc1 — Mon, 19 Jul 2021 05:58:07 GMT

I am using an application code where i need to write an value at a particular location of internal RAM to do a soft restart is that possible? because i need to read that value back again in the bootloader after the soft restart.

Re: SRAM memory reserving

vijayc1 — Mon, 19 Jul 2021 06:00:08 GMT

also can you suggest me if there are any particular registers that wont get erased after an reboot?

Re: SRAM memory reserving

kerryzhou — Mon, 19 Jul 2021 06:12:48 GMT

Hi @vijayc1

In the linker file, define a ram memory range for your own user ram area, then you define the variable in that range, after reset, no power off, the data still exists, you can read back the RAM data after reset.

Wish it helps you!

Best Regards,

Kerry

Re: SRAM memory reserving

vijayc1 — Mon, 19 Jul 2021 10:40:54 GMT

thank you for the reply,is there any code snippet to do the software reset?