High RAM Application Questions

[Dave_couling]

According to the *.map file the .bss (RAM) usage for my Application is 0x16b8 or 5816 bytes. This is obviously a very high RAM Application, likely due to the abundance of app_timers I use. I am using SDK6.1 and SD7.1. I want to make sure I'm not going to run into RAM issues at RUN-TIME. With this RAM spec in the .map file do I need to modify the gcc_startup_nrf51.s ? Or modify any other files to account for this RAM usage? Any other considerations I should be mindful of? Thank you for your advisement Nordic.

-DC

[RK]

Don't totally understand the question. If the app links without error and fits in the available space, it works, the link script has a check for this. The startup file is entirely generic and just copies things from one place to another, it doesn't matter if it copies 1 byte, 10 bytes or 16Kb.

What issues were you concerned about, perhaps I'm just missing the point?

That is a lot of RAM usage, the map file should tell you what it's all used for, although they're annoyingly tricky to read, you might want to confirm to yourself that it is app timer usage (they use that much??) and not something else.

[RK]

if you look in the .ld file there should be a check that ram doesn't overflow into stack. As long as you pass that, and your stack stays within limits during runtime, you're good to go. That's one of the benefits of having static RAM allocation instead of using heap/malloc() etc, if it links, it runs.