Stereo mode mic issue with the LC3 library inclusion.

[Rana Roy]

I am working on a custom development board with nRF5340 MCU. I have used two mics and integrated the LC3 codec library. I have assigned the following spaces in the prj.conf:

CONFIG_MAIN_STACK_SIZE=15480
CONFIG_HEAP_MEM_POOL_SIZE=16384 

I also have assigned the stack size of 24576 for the associated thread. I also tried following all the above steps. When I compile the code for a single mic, the RAM utilization reaches to 93% and works fine. But, when I use two mics simultaneously, the RAM utilization goes to almost 100% as follows:
Memory region       Used Size       Region Size       %age Used
FLASH:                   567800 B        876032 B           64.81%
RAM:                       450404 B        440 KB               99.97%
IDT_LIST:                0 GB               32 KB                  0.00%
 
Hence, the mics are not working as expected. It would be great if I could get a reference.

[Einar Thorsrud]

Hi,

The default configuration is for heap memory to utilize the remaining RAM. And in this case that seems to be too little. I do not know enough about your application to say specificalkly where you can save on RAM, but generally, there are often adjustments that can be made to various buffers and configurations to reduce RAM usage, described under Memory footprint optimization.