NRF51 removing the HEAP

RE: NRF51 removing the HEAP

Elias — Mon, 25 Nov 2019 21:56:34 GMT

For posterity:
If you're using C99, it turns out that using dynamically-sized arrays declared like "uint8_t my_array[input_size];" gets translated at compile-time to a malloc().

RE: NRF51 removing the HEAP

Øyvind Karlsen — Fri, 09 Oct 2015 06:26:13 GMT

Hi,

The simplest way of removing the HEAP is doing it in your compiler, for Keil this means using the MicroLIB functionality.

Go to Projects -> Options for Target

In the Target header check the tickbox for Use MicroLIB

More tips on reducing RAM usage can be found in this blog

Best regards,

Øyvind

RE: NRF51 removing the HEAP

Andrew — Thu, 08 Oct 2015 22:32:04 GMT

Explicit as in, no variable length arrays. Basically, as long as nothing calls to malloc() or calloc(), you can zero out the heap size safely.

RE: NRF51 removing the HEAP

ashelly — Thu, 08 Oct 2015 22:18:03 GMT

what do you mean "explicitly defined"?

RE: NRF51 removing the HEAP

Andrew — Thu, 08 Oct 2015 21:18:24 GMT

As long as there are no calls to malloc and all variables are explicitly defined you should be OK.