nrf_malloc function not able to allocate the memory.

[Rajat]

Hi everyone

I have been facing some issue while allocating memory using nrf_malloc function on nrf52840.

I am giving  a size parameter of 8 bytes inside the nrf_malloc function.

But the functio

uint8_t* frame_buffer_black = nrf_malloc(8);
 SEGGER_RTT_printf(0,"frame_buffer_black %d\r\n",*frame_buffer_black);

n returns me NULL.

Also the returned value from nrf_mem_reserve function is 0x8108. I am still not able to figure as to what is the meaning if this error.

And also what i need to do in order to be successfull in this stuation.

I have tried increasing the heap and stack size in the project settings, but that also didn't work.

What can i do to resolve this issue

Thanks 

Rajat

[bjorn-spockeli]

Which SDK version are you using?

Looking at the source code of nrf_mem_reserve() in SDK v15.2.0 it seems that it  should only return 0x8104 if it fails as the err_code variable is initialized to ( NRF_ERROR_NO_MEM | NRF_ERROR_MEMORY_MANAGER_ERR_BASE) and is only modified to NRF_SUCCESS in nrf_mem_reserve() if it can allocate a large enoug block 

Could you post the debug log output from the nRF52840?

[Rajat]

i was not calling nrf_mem_init() function before the nrf_malloc function.

So the moment i did that , the program just stops at the nrf_malloc function.

Why is this happenning?

Same was issue while using malloc() function.

Thanks

[Rajat]

now it is showing me error 0x8107 which is for invalid parameter , originated from verify requested size inside nrf_mem_reserve function.

[bjorn-spockeli]

Again which SDK version are you using?

VERIFY_REQUESTED_SIZE(size) macro will return 0x8107 (NRF_ERROR_INVALID_PARAM | NRF_ERROR_MEMORY_MANAGER_ERR_BASE) if the requested size is larger that the largest block size that is set in the memory manager module. 

#define MAX_MEM_SIZE MEMORY_MANAGER_SMALL_BLOCK_SIZE == 32

So you must be calling nrf_mem_reserve() with a size larger than 32. 

The MEMORY_MANAGER_SMALL_BLOCK_SIZE can be set in sdk_config.h

[Rajat]

Thanks , It worked. 

I changed the max size parameter in sdk_config.h

And sorry mate , to keep you waiting. I was using SDK 15.0

Thanks for the Answer