nRF52810 | FDS | FDS_ERR_UNALIGNED_ADDR

[Spirit]

Hello guys!

Are there any difference in using FDS library with a nRF52832 or with nRF52810? I will explain.

I'm using a FDS for writing/reading to flash for 2 months right now without any problems on a nRF52832. But when I use (port) this exact code on a nRF52810 (native, non emulated!) I receive already on a first fds_record_write a FDS_ERR_UNALIGNED_ADDR error.

A problematic part:

fds_record_t       		m_record;
fds_record_desc_t  	m_record_desc;

...

static uint32_t file_create(void)
{
    ret_code_t err_code;
	
	static char const    m_default_name[]  = "DevName";

    m_record.file_id           = DEVICE_NAME_ID;
    m_record.key               = DEVICE_NAME_RECORD_KEY;
    m_record.data.p_data       = &m_default_name;
    m_record.data.length_words = BYTES_TO_WORDS(m_default_name);  // Align data length to 4 bytes.

	m_fds_write_success = false;
	
    err_code = fds_record_write(&m_record_desc, &m_record);
	
	NRF_LOG_INFO("fds_record_write err: %x", err_code);
	APP_ERROR_CHECK(err_code);
	
	while(m_fds_write_success != true)
	{
			app_sched_execute();
	}
	
	...
	
}

I know that this library it's still experimental and that a nRF52810 is new, but anyway... any idea where to dig?

On a 10 I'm using a SDK 14.2 and S112 (5.1.0) while on a 32 I'm using a SDK 14.2 and S132 (5.0.0).

[RK]

so you have an unaligned address. Since you're taking the address of a const char array there's no guarantee how it's aligned. So you were just getting lucky. Align the name properly as the error message is telling you (and you could have just debugged this and looked at the address you put in the structure).

[Spirit]

Thank you for your answer, RK!

[jloliveira]

Hi RK, I'm struggling with the same FDS_ERR_UNALIGNED_ADDR issue when I try to update a flash record through FDS. How do I guarantee that the address from the struct I'm trying to save in flash is word aligned?

Thank you