How can I allocate more stack and heap size in the nRF52840 build?

Development Platforms
1

It seems that very little of what’s available is being allocated, and I’m running into a stack overflow if I try to increase the size of my program data. Here is the result of a successful compilation with less data allocated:

Processing nrf52840_dk (platform: nordicnrf52; board: nrf52840_dk; framework: arduino)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

PLATFORM: Nordic nRF52 > Nordic nRF52840-DK
HARDWARE: NRF52840 64MHz 256KB RAM (1MB Flash)
DEBUG: CURRENT(cmsis-dap) ON-BOARD(cmsis-dap, jlink) EXTERNAL(blackmagic, stlink)
Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF MODES: FINDER(chain) COMPATIBILITY(soft)
Collected 2 compatible libraries
Scanning dependencies...
No dependencies
MethodWrapper(["checkprogsize"], [".pioenvs\nrf52840_dk\firmware.elf"])

DATA:    [          ]   0.4% (used 1072 bytes from 262144 bytes)
PROGRAM: [          ]   0.4% (used 4384 bytes from 1048576 bytes)
.pioenvs\nrf52840_dk\firmware.elf  :
section            size        addr
.text              3948           0
.ARM.exidx            8        3948
.data               428   536870912
.bss                644   536871340
.heap              8192   536871984
.stack_dummy       8192   536871984
.ARM.attributes      46           0
.comment            126           0
.debug_frame        192           0
Total             21776
==================================================================================== [SUCCESS] Took 5.19 seconds ====================================================================================

but here is what I get if I increase the amount of data used by program by just a smidge:

Processing nrf52840_dk (platform: nordicnrf52; board: nrf52840_dk; framework: arduino)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option

PLATFORM: Nordic nRF52 > Nordic nRF52840-DK
HARDWARE: NRF52840 64MHz 256KB RAM (1MB Flash)
DEBUG: CURRENT(cmsis-dap) ON-BOARD(cmsis-dap, jlink) EXTERNAL(blackmagic, stlink)
Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF MODES: FINDER(chain) COMPATIBILITY(soft)
Collected 2 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <Wire> 1.0
|-- <SPI> 1.0
Compiling .pioenvs\nrf52840_dk\src\main.cpp.o
Linking .pioenvs\nrf52840_dk\firmware.elf
c:/users/coolermaster/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: region RAM overflowed with stack
collect2.exe: error: ld returned 1 exit status
*** [.pioenvs\nrf52840_dk\firmware.elf] Error 1
===================================================================================== [ERROR] Took 9.07 seconds =====================================================================================

Please advise.

2

As a first step, rerun with pio run -v, find out where the linker file (.ld) is, and modify it locally with what works for you.

3

Thanks for the clue. :slight_smile:

I found that the answer is to modify the file nrf52_xxaa.ld