How to read data by using fstorage

Question

Hii all, 
 I am working on a project where I need to store data to persistent storage and retrieve back when the board is restart. but now we are migrated to simultaneous central and peripheral role and I found some thing like fstorage and I read this is just like pstorage but efficient than pstorage 
So I would like to use this for my operation but its something wondering like when I look at the doc of fstorage we only have fs_store() and fs_erase() but nothing like fs_load().
Can any one suggest me is there any way to do that 
 I'm using nRF5_SDK_11.0.0_89a8197
Thank you

bjorn-spockeli · Accepted Answer

After calling fs_store() you will receive the FS_EVT_STORE event in the fs_evt_handler() when the flash operation is finished. Within the fs_evt_t structure you'll find the pointer to the data that was written to flash. 
 To retrieve the data, you must create a pointer variable that should be used to store the pointer that points to the data in flash, i.e. 
 const uint32_t * stored_data;
 
 and when you get the FS_EVT_STORE , simply set the pointer to point to the same address as the pointer that is returned in the fs_evt_handler() , i.e. 
 static void fs_evt_handler(fs_evt_t const * const evt, fs_ret_t result)
{
 switch(evt->id)
 {
 case FS_EVT_STORE:
 if(result == FS_SUCCESS)
 {
 stored_data = evt->store.p_data;
 SEGGER_RTT_printf(0,"Stored Data: %X 
",*stored_data);
 }
 break;
 
 case FS_EVT_ERASE:
 // Handle erase event
 break;
 
 default:
 //Do nothing
 break;
 }
}
 
 This is provided that you run the following code snippet in main() 
 FS_REGISTER_CFG(fs_config_t fs_config) =
 {
 .callback = fs_evt_handler, // Function for event callbacks.
 .num_pages = 1, // Number of physical flash pages required.
 .priority = 0xFE // Priority for flash usage.
 };

fs_ret_t ret = fs_init();
if (ret != FS_SUCCESS)
{
 SEGGER_RTT_printf(0,"FS ERROR OCCURED
");
 // An error occurred.
}

//Data to be written to flash
static uint32_t data = 0x12345678;

ret = fs_store(&fs_config, fs_config.p_start_addr, &data, 1);
if (ret != FS_SUCCESS)
{
 SEGGER_RTT_printf(0,"FS ERROR OCCURED
");
 // An error occurred.
} 
 
 and that you have added the fs_sys_event_handler() function in sys_evt_dispatch() , i.e. 
 static void sys_evt_dispatch(uint32_t sys_evt)
{
 ble_advertising_on_sys_evt(sys_evt);
 fs_sys_event_handler(sys_evt);
}
 
 -Bjørn

How to read data by using fstorage

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