cJSON SPIRAM allocator

example.c

//! @brief For cjson: Memory allocator to use SPIRAM
//!
//! @param[in] sz Size of the memory to allocate
//! @return Pointer to the allocated memory if successful, or NULL if not successful
void* cjson_caps_malloc(size_t sz)
{
    return heap_caps_malloc(sz, MALLOC_CAP_SPIRAM);
}

//! @brief For cjson: Memory allocator to use SPIRAM
//!
//! @param[in] ptr Pointer to the allocated memory that is to be freed
void CJSON_CDECL cjson_caps_free(void* ptr)
{
    heap_caps_free(ptr);
}

//! @brief Install function handlers so that cJSON will use SPIRAM
static void cjson_mem_init()
{
    // Configure cJSON to use SPIRAM
    cJSON_Hooks cjson_hooks = {
        .malloc_fn = &cjson_caps_malloc,
        .free_fn = &cjson_caps_free,
    };
    cJSON_InitHooks(&cjson_hooks);

    return;
}