topic Re: LPC55S16 SRAM enlarge? in LPC Microcontrollers

LPC55S16 SRAM enlarge?

felix1 — Wed, 23 Aug 2023 11:05:34 GMT

Hi,

I need more SRAM to store image data for panel, can I enlarge the SRAM size of LPC55S16?

Re: LPC55S16 SRAM enlarge?

Alice_Yang — Thu, 24 Aug 2023 08:33:13 GMT

You can place some data into SRMX, detail steps refer to:

https://community.nxp.com/t5/LPC-Microcontrollers-Knowledge/LPC-How-to-place-data-function-file-in-specified-memory-under/ta-p/1316392

Alice

Re: LPC55S16 SRAM enlarge?

frank_m — Thu, 24 Aug 2023 09:21:51 GMT

Looking at your RAM usage, I would highly suggest to either consider a MCU variant with more RAM, or rework/optimize your code and variable declarations.

Often, algorithms put emphasis on performance. to the detriment of memory usage.
Or vice versa.

Re: LPC55S16 SRAM enlarge?

felix1 — Fri, 25 Aug 2023 06:50:35 GMT

Hi,

Indeed, change to LPC55S28 is a solution, but I have only LPC55S16-EVK now.

I need to get image data through USB port and refresh the panel with frame buffer 480*(800/8)=48000 bytes. For now, I need to refresh the left side of the panel, and then the right side. It produces the refresh delay from left side to right side.

Can I move USB stack to SRAMX?

Re: LPC55S16 SRAM enlarge?

frank_m — Fri, 25 Aug 2023 10:25:02 GMT

> I need to get image data through USB port and refresh the panel with frame buffer 480*(800/8)=48000 bytes.

I expected something like that.
I mean, an application expected to shuffle around large data volumes at high(er) throughput.
Just keep in mind that generic MCUs are not very well suited for that.
DSPs are made for that, and most application processors (Cortex A) and some high-end Cortex M devices have dedicated hardware to handle displays.

With a generic MCU, you need to accept limitations.
You could reduce the package size, and optimize it through double-buffering mechanisms and/or DMA usage.

I would suggest to profile your application, and see where it spends most time.
And evaluate what options you have to improve performance, or reduce the visible impact.