Can't write in flash memory using FDS module with RTX5

[jPolo777]

Hi. I got a HardFault_Handler when I try to write data on flash memory using the fds_record_update function in a RTOS environment (RTX5). My program has three tasks: one for managing the flash memory (read and write data), one to make blinking the LED 1 and another one to make blinking the LED 2. The program doesn't have problem for reading (fds_record_open), but it always falls in hard fault when I want to write, even if I comment the LED tasks (only the flash task is active). I also tried the code without RTOS and it worked fine, so I guess it should be a problem of compatibility with RTX5. Here's is a part of the flash task code I'm using in the program where I perform a fds_record_update:

 

my_struct params = 
{
	.param1 = rand() % (10+1),
	.param2 = rand() % (20+1 - 10) + 10,
	.param3 = rand() % (30+1 - 20) + 20,
	.param4 = rand() % (40+1 - 30) + 30,
	.param5 = rand() % (50+1 - 40) + 40,
};

fds_record_t const record =
{
		.file_id           = VC_FILE,
		.key               = VC_KEY,
		.data.p_data       = &params,
		.data.length_words = (sizeof(params) + 3) / sizeof(uint32_t),
};

fds_record_find(VC_FILE, VC_KEY, &desc, &tok); // To recover the descriptor
ret_code_t ret = fds_record_update(&desc, &vc_record); // Update the record value found on file VC_FILE with VC_KEY
if( ret != NRF_SUCCESS && (ret == FDS_ERR_NO_SPACE_IN_FLASH))
	m_error_FDS = FDS_FLASH_FULL;

I'm using a DK nRF52840 and SDK 17.1.0. Any help would be appreciated!

[Vidar Berg]

Hello,

Is this with the Softdevice enabled? If so, please check if you have selected the correct backend for fstorage (should be the SoftDevice backend). I would also suggest that you enable the HardFault handling library in your project to get more information on what actually triggered the expection. This requires that you include the following source files:

- "\components\libraries\hardfault\hardfault_implementation.c"

- "components\libraries\hardfault\nrf52\handler\hardfault_handler_<toolchain/IDE variant>.c"

Thanks,

Vidar

[jPolo777]

No, I don't use the Softdevice. Could you please provide an example of how to implement the HardFault handling library?

Thanks.

[Vidar Berg]

All you have to do is to include the source files I mentioned, then make sure the HARDFAULT_HANDLER_ENABLED config setting is set to '1' in your sdk_config file. Have you tried that already?

[jPolo777]

Yes I did, the program restarts, but I'm not sure to understand how that could help me to solve the problem for writing the flash memory using a RTOS.

[Vidar Berg]

 The HardFault_c_handler() function should print information about what caused the fault exception if you have logging enabled.

Have you defined "DEBUG" in your project. This should make you program hit the flash breakpoint (NRF_BREAKPOINT_COND) in HardFault_c_handler() and prevent your program from resetting.