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.

[Dave_couling]

We have seen (seemly at random) when I go to press the button, the chip seems to grind to a halt. This can happen at any point. Within 2hrs of programming or +3weeks. I had suspected that something to do with the app_button module was causing this. Since the Button Module uses the scheduler, along with App_timers and SoftDevice. Could these 3 items all using the Scheduler at the same time potentially cause a CPU freeze?

I have recently bumped up the SCHED_QUEUE_SIZE to 30 (from 18). Is there a rule of thumb for setting this? We have 20 app_timers, 2 other misc app_sched_event_put handlers, app_button and the SoftDevice. Thanks for the help.