SDK 7.2 Hangs on Flash Write, Flash Read works

[sroberts]

I've followed this for assistance, but I'm stuck: https://devzone.nordicsemi.com/question/17846/nonvolatile-memory-access/

I can read from flash, but I can't write to flash. Let me layout what I do first:

S130 SDK 7.2

In main(...):

    if(NRF_SUCCESS != pstorage_init())
	{
			APP_ASSERT (false);
			//nrf_gpio_pin_set(PSTORAGE_ERROR_LED_PIN_NO);
	}
	

	param.block_size  = 16;              //Select block size of 16 bytes
	param.block_count = 10;              //Select 10 blocks, total of 160 bytes
	param.cb          = flash_handler;   //Set the pstorage callback handler
	if (NRF_SUCCESS != pstorage_register(&param, &handle))
	{
				APP_ASSERT (false);
				//nrf_gpio_pin_set(PSTORAGE_ERROR_LED_PIN_NO);
	}
	

When I set a flag for write event, in my do loop:

        if(rtc1_timeout())
		{
			gs_advertising_is_running = false;
			gs_scanning_is_running = false;
			
			if(write_flag == 1)
			{
				//just in case, kill advertise and scan
				sd_ble_gap_scan_stop();
				sd_ble_gap_adv_stop();
				
				//writing halts CPU
				write_flash();
				write_flag = 0;
			}
			
		}

My actual write event (simplistic):

static void write_flash(void)
{
    uint32_t volatile error = 0;

    error = pstorage_block_identifier_get(&handle, 0, &block_0_handle);
    error = pstorage_clear(&block_0_handle, 16);                       //Clear 16 bytes
    error = pstorage_store(&block_0_handle, source_data_0, 16, 0); 
    pstorage_wait_handle = block_0_handle.block_id;            //Specify which pstorage handle to wait for
    pstorage_wait_flag = 1;
    while(pstorage_wait_flag){power_manage();}             //Sleep until store operation is finished.
}

Where am I going wrong? My asserts don't catch anything. I can read flash, but after trying to write it gets stuck in a loop. It never enters into my "flash_handler" but my read flash function does.

Any help would be appreciated.

[sroberts]

Looking at the 7.2 SDK, is sd_flash_write(...) easier? Any examples out there for this?

[Susheel Nuguru]

Follow the steps in this thread.

Your reads are working because reads get callbacks directly from pstore module. The store/clear and update events come from softdevice and you need to register the event callback from softdevice and call pstorage_sys_event_handler so that it can update its state machine,

[sroberts]

After some trial and error, I got it to work. All my code followed the examples and what is listed in the SDK online, but I was using the some "experimental" example that had this as part of the ble_stack_init():

sd_softdevice_enable((uint32_t)NRF_CLOCK_LFCLKSRC_XTAL_75_PPM, softdevice_assert_callback);

If I remove that, and replace it with the below, everything works:

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_8000MS_CALIBRATION, false);

Now I have to understand why...At least it working.

[Susheel Nuguru]

by using SOFTDEVICE_HANDLER_INIT you are initializing softdevice_handler module which apart from registering you call back also does sd_softdevice_enable for you. softdevice handler module owns SWI2_IRQHandler handler, so if you are not using it you have to manage your callbacks by overwriting this handler in your application.