data saved different to data read

RE: data saved different to data read

koustubhavachat — Tue, 10 May 2016 07:26:12 GMT

where is declaration of "NRF_CLOCK_LFCLKSRC_XTAL_20_PPM"?

RE: data saved different to data read

ting² — Fri, 12 Dec 2014 14:13:54 GMT

Thank you for your help! I did not work, because I forgot this part:

static void sys_evt_dispatch(uint32_t sys_evt)
{
    pstorage_sys_event_handler(sys_evt);
}

void body_ble_stack_init(void) {
	uint32_t err_code;
	// Initialize the SoftDevice handler module.
	SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM , false);
	err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
	
}

RE: data saved different to data read

John — Thu, 11 Dec 2014 14:31:53 GMT

Hi, if you are calling the read immediately after the write, the 0xFF return is to be expected. The update operation takes time, but the pstorage update function is non-blocking. So, the update was not complete when you read the memory back. This thread shows one solution to the problem Wait for event.

It isn't elegant but it is effective. I do not know why the callback wasn't called, its hard to tell without seeing all of the code invoking these functions.

RE: data saved different to data read

ting² — Thu, 11 Dec 2014 08:28:14 GMT

Firstly, I called the functions read_setting_from_flash() just after save_settings_to_flash(). It gave me the previous result. Then I tried with a callback function like below:

static void app_data_flash_manager_cb_handler(pstorage_handle_t * handle, uint8_t op_code, uint32_t result, uint8_t * p_data, uint32_t data_len)
{ 
	switch(op_code)
	{
		case PSTORAGE_STORE_OP_CODE:
			if (result == NRF_SUCCESS)
			{
				 UART_TXT("Storage successful..\r\n\0");
				 
			// Store operation successful.
			}
			else
			{
				 UART_TXT("Storage failed..\r\n\0");
			// Store operation failed.
			}
		case PSTORAGE_ERROR_OP_CODE:
			if (result == NRF_SUCCESS)
			{
			// Operation successful.
			}
			else
			{
			// Error! Operation failed.
			}
		case PSTORAGE_LOAD_OP_CODE:
			if (result == NRF_SUCCESS)
			{
			// Store operation successful.
			}
			else
			{
			// Store operation failed.
			}
			// Source memory can now be reused or freed.
			break;
		case PSTORAGE_UPDATE_OP_CODE:
			if (result == NRF_SUCCESS)
			{
			// Update operation successful.
			}
			else
			{
			// Update operation failed.
			}
			break;
		case PSTORAGE_CLEAR_OP_CODE:
			if (result == NRF_SUCCESS)
			{
				 UART_TXT("Storage cleared..\r\n\0");
				 save_settings_to_flash();
			}
			else
			{
				 UART_TXT("j'ai pas reussi à effacer..\r\n\0");
			}
			break;
	}
}

But the function is never called....

RE: data saved different to data read

John — Wed, 10 Dec 2014 18:46:10 GMT

The 0xFF values are typically erased NVRAM. Best guess without seeing how your actually invoke your two functions is that you are calling your readings_from_flash function before the pstorage_update operation has completed. Are you waiting for the NRF_EVT_FLASH_OPERATION_SUCCESS event before calling your readings_from_flash function?