program hangs on startup if not using microlib

RE: program hangs on startup if not using microlib

Jørgen Holmefjord — Thu, 19 Jan 2017 15:16:52 GMT

As mentioned in the softdevice documentation, no heap is required by the softdevice. Also, from the ROM and RAM management tutorial: Heap memory can safely be set to zero as long as you don't use dynamic memory allocation (malloc/free). Note that heap is generally not used in our SDK examples. You are correct that using microlib will disable heap usage, but heap usage should not originate from the SDK examples.

RE: program hangs on startup if not using microlib

Bill Russell — Thu, 19 Jan 2017 14:43:32 GMT

My understanding was that the full C library (non microlib) uses the heap.

RE: program hangs on startup if not using microlib

Jørgen Holmefjord — Thu, 19 Jan 2017 09:51:56 GMT

Did you set optimization level to 0? Have you added something to your project that use heap? The softdevice and SDK should not use any heap.

RE: program hangs on startup if not using microlib

Bill Russell — Wed, 18 Jan 2017 16:38:23 GMT

it is stuck in a loop in an area with no source available, when I don't use microlib. If I use microlib then it runs fine. I am thinking its heap related (since full C library is said to use it), although my arm_startup_nrf52.s appears to have 8192 of heap defined.

RE: program hangs on startup if not using microlib

Jørgen Holmefjord — Mon, 16 Jan 2017 09:57:23 GMT

MicroLib is optimized to use less code and data memory than using the ARM standard library. It should not affect the functionality of the code, as long as your program is compiled without errors and you flash the program correctly to the device. Have you tried debugging, to see where the code is stuck?