Writing to flash.

Question

Hello, 
 I want to store some values to flash. What is the best method to store data to flash? 
 I'm trying to get pstorage working but i have no luck, so i'm wondering if there are any other ways... 
 my code for pstorage: 
 static void example_cb_handler(pstorage_handle_t * handle,
 uint8_t op_code,
 uint32_t result,
 uint8_t * p_data,
 uint32_t data_len)
{
 if(handle->block_id == pstorage_wait_handle) { pstorage_wait_flag = 0; } //If we are waiting for this callback, clear the wait flag.
	
 switch(op_code)
 {
 case PSTORAGE_LOAD_OP_CODE:
 if (result == NRF_SUCCESS)
 { 
 LOG_DEBUG("LOAD");
 }
 else
 {
 LOG_DEBUG("LOAD error");
 }
 break;
 case PSTORAGE_STORE_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 LOG_DEBUG("STORE");
 }
 else
 {
 LOG_DEBUG("STORE error");
 }
 break; 
 case PSTORAGE_UPDATE_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 }
 else
 {
 }
 break;
 case PSTORAGE_CLEAR_OP_CODE:
 if (result == NRF_SUCCESS)
 {
 }
 else
 {
 }
	

 break;
 case PSTORAGE_ERROR_OP_CODE:
 break; 
 }
}

pstorage_module_param_t param;
pstorage_handle_t handle;
pstorage_handle_t block_0_handle;
uint8_t dest_data[5];
static uint8_t block0[4] __attribute__((aligned(4)));


static void pstorage_init_register(void)
{
	uint32_t	error_code;
	if(pstorage_init()!=NRF_SUCCESS)
 LOG_DEBUG("PSTORAGE INIT NI USPEL");
 
	param.block_size = 16; //Select block size of 16 bytes
	param.block_count = 1; //Select 10 blocks, total of 160 bytes


	param.cb = example_cb_handler; //Set the pstorage callback handler
 
 if((error_code=pstorage_register(&param, &handle))!=NRF_SUCCESS)
 LOG_DEBUG("PSTORAGE REGISTER NI USPEL. ERROR_CODE: %x",error_code);
 else
 LOG_DEBUG("PSTORAGE INIT IN REGISTER USPEL");
}

static void pstorage_store_data(uint8_t* source_data, int i)
{
	uint32_t	error_code;
	pstorage_block_identifier_get(&handle, 0, &block_0_handle);
	pstorage_clear(&block_0_handle, 16);
	if(error_code!=NRF_SUCCESS)
 LOG_DEBUG("IDENTETY ERROR CODE store: %x",error_code);
	error_code=pstorage_store(&block_0_handle, source_data, 4, 0); 
	if(error_code!=NRF_SUCCESS)
 LOG_DEBUG("PSTORAGE LOAD ERROR CODE: %x",error_code);
	LOG_DEBUG("ERROR CODE %x",error_code);
	
}

static void pstorage_read_data(void)
{
	uint32_t error_code;
	error_code=pstorage_block_identifier_get(&handle, 0, &block_0_handle);
	if(error_code!=NRF_SUCCESS)
 LOG_DEBUG("IDENTETY ERROR CODE read: %x",error_code);
	error_code=pstorage_load(dest_data, &block_0_handle, 4, 0);
	if(error_code!=NRF_SUCCESS)
 LOG_DEBUG("PSTORAGE LOAD ERROR CODE: %x",error_code);
	LOG_DEBUG("DEST_DATA: %x",*dest_data);
}
 
 The example_cb_handler only seems to get called when i call pstorage_read (and even then, the returned values are only 0xFF).
If i call pstorage_store, the example_cb_handler doesn't get called. 
 What could cause this problem? 
 regards.

Stefan Birnir Sverrisson · Accepted Answer

Hi 
 You need to register system event handler with 
 softdevice_sys_evt_handler_set(sys_evt_dispatch);
 
 and then when the system event handler is called by the softdevice you need to forward it to the pstorage module with 
 pstorage_sys_event_handler(sys_evt);
 
 as done in ting's answer on this thread .

Writing to flash.

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