Mesh Flash Manager

Question

On SDK16.0.0 + Mesh SDK 4.1.0

I am trying to store some user data using the Flash Manager. I am modifying the light switch server mesh example.

There are a lot of posts about this, but none of them have a final answer how to get it done.

Here is what I have so far:

#define FLASH_CUSTOM_DATA_GROUP_ELEMENT 0x4748
#define CUSTOM_DATA_FLASH_PAGE_COUNT 1

typedef struct {
    uint8_t data[256];
} custom_data_format_t;

static flash_manager_t m_custom_data_flash_manager;

Then in main(), just before the forever for loop (after everything has been initialized:

uint32_t ret_code;
flash_manager_config_t custom_data_manager_config;
custom_data_manager_config.write_complete_cb = NULL; 
custom_data_manager_config.invalidate_complete_cb = NULL; 
custom_data_manager_config.remove_complete_cb = NULL; 
custom_data_manager_config.min_available_space = WORD_SIZE;

//custom_data_manager_config.p_area = (const flash_manager_page_t *)(((const uint8_t *)flash_manager_recovery_page_get()) - (ACCESS_FLASH_PAGE_COUNT * PAGE_SIZE) - (NET_FLASH_PAGE_COUNT * PAGE_SIZE));
custom_data_manager_config.p_area = (const flash_manager_page_t *)(((const uint8_t *)flash_manager_recovery_page_get()) - (10 * PAGE_SIZE));

__LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "user area: 0x%08x \n", custom_data_manager_config.p_area);
custom_data_manager_config.page_count = CUSTOM_DATA_FLASH_PAGE_COUNT;

ret_code = flash_manager_add(&m_custom_data_flash_manager, &custom_data_manager_config);

if(NRF_SUCCESS != ret_code) {
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Flash error: %u\n", ret_code);
}
else {
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "flash_manager_add() successful\n");
}

// Write to Flash
fm_entry_t * p_entry = flash_manager_entry_alloc(&m_custom_data_flash_manager, FLASH_CUSTOM_DATA_GROUP_ELEMENT, sizeof(custom_data_format_t));
if(p_entry == NULL) {
    return NRF_ERROR_BUSY;
}
else {
    custom_data_format_t * p_custom_data = (custom_data_format_t *) p_entry->data;
    
    // Generate test data
    for(uint8_t i=0; i<256; i++) {
        p_custom_data->data[i] = i;
    }
    
    // Write
    flash_manager_entry_commit(p_entry);
}

// Wait for flash manager to finish.
flash_manager_wait();

// Read back test data
const fm_entry_t * p_read_raw1 = flash_manager_entry_get(&m_custom_data_flash_manager, FLASH_CUSTOM_DATA_GROUP_ELEMENT);
const custom_data_format_t * p_read_data = (const custom_data_format_t *) p_read_raw1->data;
for(uint8_t i=0; i<256; i++) {
   __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "p_read_data[%u]: %u\n", i, p_read_data[i]);
}

This keeps on asserting somewhere after the flash_manager_add().

I am not sure how to calculate the custom_data_manager_config.p_area correctly. All the examples referred to ACCESS_FLASH_PAGE_COUNT and NET_FLASH_PAGE_COUNT, which is not used anymore. I tried not offsetting by anything and I tried to offset it by 10 pages.

Thanks.

Hung Bui · Accepted Answer

Hi Ferdi, 
 It's not recommended to use the flash_manager directly. Instead we suggest to use the mesh config module to store your own data instead. You can find the documentation with example code here . You can also have a look at our Enocean_switch example to see how it's implemented. In the example we store the state of the light switch to flash when we receive a packet.

Mesh Flash Manager

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