pstorage function not working

Question

I want to use pstorage with ble uart to store the data over bluetooth to flash . I did the coding for the pstorage operations. But the problem is that the pstorage store, clear and update functions not making the callback to exampleb_cb_handler.But the the load operation is working fine. The pstorage_access_status_get always show count greater than 0.
what I am doing wrong? 
 static void example_cb_handler(pstorage_handle_t * handle,
 uint8_t op_code,
 uint32_t result,
 uint8_t * p_data,
 uint32_t data_len){
 app_uart_put('e');
 switch(op_code)
 {
 
 case PSTORAGE_LOAD_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 // Store operation successful.
 app_uart_put('l');
 }
 else
 {
 app_uart_put('f');
 // Store operation failed.
 }
 // Source memory can now be reused or freed.
 break;
 
 case PSTORAGE_UPDATE_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 app_uart_put('u');
 // Update operation successful.
 }
 else
 {
 // Update operation failed.
 app_uart_put('f');
 }
 break;
 case PSTORAGE_CLEAR_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 pstorage_wait_flag = 0;
 app_uart_put('c');
 // Clear operation successful.
 }
 else
 {
 app_uart_put('f');
 // Clear operation failed.
 }
 break;
 
 case PSTORAGE_STORE_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 app_uart_put('s');
 // Clear operation successful.
 }
 else
 {
 app_uart_put('f');
 // Clear operation failed.
 }
 break;
 
 
 
 
 
 }}

 void example_pstorage_init(void)
	{
 uint32_t retval;	
pstorage_handle_t base_handle;
pstorage_handle_t block_handle; 
 
pstorage_module_param_t param;

uint8_t source_data[500]={79,79,0,0,0,0,0,0,125,0,69,68,82,83,84};
uint8_t dest_data[500]; 

	
 retval = pstorage_init();
 if(retval == NRF_SUCCESS)
 {
 // Module initialization successful.
 }
 else
 {
 // Initialization failed, take corrective action.
 }




	
param.block_size = 1024;
param.block_count = 1;
 
param.cb = example_cb_handler;
 
retval = pstorage_register(&param, & base_handle);
 
	app_uart_put(retval);
if (retval == NRF_SUCCESS)
{
 // Registration successful.
}
else
{
 // Failed to register, take corrective action.
}
 


	
retval = pstorage_block_identifier_get(&base_handle, 0, &block_handle);
	app_uart_put(retval);

if (retval == NRF_SUCCESS)
{
 // Get Block Identifier successful.
}
else
{
 // Failed to get block id, take corrective action.
}	
retval = pstorage_clear(&block_handle, 1024);	
	app_uart_put(retval);
	
pstorage_wait_flag = 1;
//while(pstorage_wait_flag) { power_manage(); } 
uint32_t count;
app_uart_put(retval);

pstorage_store(&block_handle, source_data, 500, 0);
pstorage_load(dest_data, &block_handle, 100, 0);

retval = pstorage_access_status_get(&count);

app_uart_put(count);

for(i=0;i<100;i++)
{
	app_uart_put(dest_data[i]);
}
 
}

Susheel Nuguru · Accepted Answer

You might have forgotten to add pstorage handler in the system event handler. The symptoms of this is that your operation will get complete but it will not call your handler 
 static void sys_evt_dispatch(uint32_t sys_evt)
{
 pstorage_sys_event_handler(sys_evt);
 ...
}