FDS erase

[Fabien Comte]

Hello,

I need to reset FDS. How can I get it's address / size in code ? How to erase it's area ?

Thank you.

[Jared]

Hi

You can use nrfjprog for erasing the data in flash if it's not a part of your application. However, if it's part of your application then you can use nrf_fstorage_erase(). Flash can contain a lot of stuff, boot-loader, softdevice, application etc. Erasing flash would therefore require you to have an overview of its contents. If not, you can risk deleting the application itself. SES gives an overview of the content of flash after compilation. I would recommend  that you use the FDS module so that you avoid the scenario of having to erase the entire flash. The FDS module gives you a reference to data in flash with its files, and records. You write that you get a fatal error when you use  nrf_fstorage_erase(), could be more specific? What kind of error code is thrown? What are the parameters you use in  nrf_fstorage_erase()? 

Jared 

[Fabien Comte]

Error printed fatal error on RTT output (in event management)

I finally found a way to create my "FDS" format that works nice. Thank you for your help.

[natersoz]

This sounds interesting. Is this code publicly  accessible on github?

[Fabien Comte]

void fds_erase()
{
	flash_bounds_set();
	
	NRF_LOG_INFO("FDS area is 0x%08X - 0x%08X", m_fs.start_addr, m_fs.end_addr - 1);
	

	ret_code_t rc = nrf_fstorage_init(&m_fs, &nrf_fstorage_nvmc, NULL); // only working for bootloader

	if (rc == NRF_SUCCESS)
	{
		NRF_LOG_INFO("nrf_fstorage_init OK");
	}
	else
	{
		NRF_LOG_ERROR("nrf_fstorage_init error (%d)", rc);
		return;
	}
	
	for (int a = m_fs.start_addr; a < m_fs.end_addr; a++)
    {
		unsigned char * fds_area = (unsigned char *) a;
        if (fds_area[0] != 0xFF)
        {
            NRF_LOG_INFO("FDS not clear at 0x%08X", a);
			break;
        }
    }
	
	for (int p = 0; p < FDS_VIRTUAL_PAGES; p++)
	{
		NRF_LOG_INFO("FDS erasing page %d", (int) p);

		#if   defined(NRF51)
			int erase_unit = 1024;
		#elif defined(NRF52_SERIES)
			int erase_unit = 4096;
		#endif

		int page_addr = m_fs.start_addr + p * erase_unit; // erase unit == virtual page size

		nrf_nvmc_page_erase(page_addr);

		low_power_delay_ms(200);
	}
	
	for (int a = m_fs.start_addr; a < m_fs.end_addr; a++)
    {
		unsigned char * fds_area = (unsigned char *) a;
        if (fds_area[0] != 0xFF)
        {
            NRF_LOG_ERROR("FDS erase failed at 0x%08X", a);
			break;
        }
    }
		
	NRF_LOG_INFO("FDS erase finished");
}

[Fabien Comte]

This is the part of my code that can interest you (for bootloader).

[natersoz]

Thank you!