Link to CMSIS-DSP with optimization to size don't work

[jespermadsen]

I'm using MCUXpresso IDE v11.2.1 and made a project for LPC_11xx with lpcopen and CMSIS-DSP.

when I change the optimization to size i get a hardfault when it calls the CMSIS-DSP arm_fir_fast_q15 function.

Seems to work at the -O3 optimization.

[Alice_Yang]

Hello jespermadsen,

You can run into that function, and check the disassemble to confirm which code

made hardfault.

Regards,

Alice

 

[jespermadsen · Accepted solution]

I found out that the fir data has to be aligned with 4 bytes:

static __attribute__((aligned(4))) q15_t firStateQ15[BLOCK_SIZE + NUM_TAPS - 1];