Hello!
I am developing a FreeRTOS application for nrf52832 with S132 Soft device
Recently I ran out of ram and checked the map-file for clues. The large posts in the mapfile were
28k uCheap (heap_1.c) (determined by configTOTAL_HEAP_SIZE in FreeRTOSConfig.h)
8k __HEAP_SIZE
8k __STACK_SIZE
11k Soft device
9k Other
Total: 64k
So I stated wondering about why there was 16k to heap and stack when FreeRTOS uses its own uCheap (28k in my case) as heap and for thread-stacks (trough its own pvPortMalloc())
__HEAP_SIZE can be set to 0 according to this link:
__STACK_SIZE is (according to this link) used as
* stack for main() before the scheduler is started
* reused for ISR stack after the scheduler is started
So my questions are
1) Can the __HEAP_SIZE be reduced to 0 safely in my setup (or is there any low-level stuff relying on regular malloc (not freertos malloc))?
2) What is the lowest safe recommended __STACK_SIZE?
I don't use interrupts in my own code but I assume FreeRTOS uses atleast RTC IRQ and maybe the NRF SDK also uses ISR and requires some stack?
3) Are these topics discussed in some documenation that I have missed?
Thanks in advance,
Axel
