Posted 2014-12-02 13:59:44 +0200

blogs->all

The linker in the GCC toolchain, ld, produces a *.Map file which shows you how the memory on your micro is being used. This file is a goldmine of information but it's a bit difficult for humans to absorb.

I've whipped up a web page which uses the excellent D3.js library to draw a visualisation of your memory usage, using the *.Map file as input. Blocks of memory are drawn proportionally so it's easy to see how much memory you have left and where it's all being used. Click on a block to zoom in on it.

You can run the tool right off the github project page, or download it and modify it for your needs. Pull requests welcome.

https://github.com/eliotstock/memory

Cheers,

Eliot

Posted Dec. 2, 2014, 5:30 p.m.

Nice! Did you use specific flags to get more information? I only see FLASH and RAM and very little used out of both. See this prog.map file.

Posted Dec. 2, 2014, 5:56 p.m.

Because you have very long symbol names, like this...

.text.ZN4func6detail16function_manager19templated_call_copyIPFvbESaIS4_EEEvRNS0_20manager_storage_typeERKS6

... ld is wrapping the memory details onto the next line which is breaking the tool.

Posted Dec. 3, 2014, 2:30 p.m.

Ah, you are right. If I join the lines together with .text in them:

ex -c '%g/\.text/j' -c "wq" prog.map


then I get a lot more info. A better one would be the one that leaves alone the lines that are already on one line:

ex -c '%g/\.text\S*[\s]*\$/j' -c "wq" prog.map


And succeeded by replacing .text.blah with .text:

sed -i 's/\.text\S*/.text/g' prog.map


The only thing left is that the items get really small when you're program gets big. I've to look in the zooming options in your code, but thanks again!

Posted Dec. 3, 2014, 5:48 p.m.

Thanks for the pull request! Merged.

## Recent blog posts

• ### 6 Things to Know about Bluetooth Beacons

Posted 2017-09-22 08:27:00 by Rose Martin
• ### Creating a Keil project for a Bluetooth Mesh example

Posted 2017-09-19 12:08:11 by Kristian Skordal
• ### Using millis() like in Arduino.

Posted 2017-09-18 11:58:04 by schef
• ### Flashing nRF5x firmware using any dumb terminal program via standard serial COM port

Posted 2017-09-18 03:53:40 by Nguyen Hoan Hoang
• ### How to Debug the nRF52 Interrupts — Useful Tips

Posted 2017-09-13 15:15:22 by Yaniv Nis

## Recent questions

• ### Device crashes when debug flags are turned on

Posted 2017-09-24 04:09:33 by tyler
• ### nrf52832 of UART problem

Posted 2017-09-24 04:05:27 by lenli
• ### RTT Stability

Posted 2017-09-24 03:28:49 by Yatekii
• ### HardFault with GPIOTE & SD

Posted 2017-09-24 03:18:09 by Yatekii
• ### Adding a service to existing SDK example code

Posted 2017-09-24 02:45:24 by alikob