[En-Nut-Discussion] NutNvMemSave overwrites other data

[Stefan Profanter]

Hi,

i'm having problems with Nonvolatile memory.

The following situation:

I use http to change the ip address of the ethernut. If i press "send" on
the html form, a cgi function is called.

 

This cgi function parses the values an then calls:

 

saved = (NutNetSaveConfig()==0);

log_debug("------- After SaveConfig %d", saved);

NvMemDebugOutput(0,300); //Prints out a ,memory dump' from address 0 to
address 300

 

But it seems, that  NutNetSaveConfig(); (which returns 0 for success)
overwrites the whole other stuff in the nonvolatile memory (eg. CONFBOOT).

Because the debug output is:

 

------------------------------------------------------

DEBUG: ------- After SaveConfig 1

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 20 65 74 68 30 00 00 00  00 00 00 06 98 30 04 3E

DEBUG: C0 A8 01 0F FF FF FF 00  C0 A8 01 01 C0 A8 01 0F

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF     -> BootConf is
missing which shoud begin here

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF

------------------------------------------------------

 

But if I make a debug output before writing, everything works fine:

 

log_debug("------- Before SaveConfig"); 

NvMemDebugOutput(0,300); //Prints out a ,memory dump' from address 0 to
address 300

saved = (NutNetSaveConfig()==0);

log_debug("------- After SaveConfig %d", saved);

NvMemDebugOutput(0,300); //Prints out a ,memory dump' from address 0 to
address 300

 

The Debug output is: 

------------------------------------------------------

DEBUG: ------- Before SaveConfig

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 20 65 74 68 30 00 00 00  00 00 00 06 98 30 04 3E

DEBUG: C0 A8 01 0F FF FF FF 00  C0 A8 01 01 C0 A8 01 0F

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 40 00 C0 A8 01 1E 68 6F  6D 65 61 75 74 6F 2E 62     -> BootConf is
here before Saving

DEBUG: 69 6E 00 00 00 00 00 00  00 00 00 00 00 00 00 00

DEBUG: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00

DEBUG: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 14 FF FF FF C0 A8 01 01  82 95 11 15 00 00 00 00     -> Adress 256:
Here are some other settings which are also overwritten

DEBUG: 00 00 00 00 FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF

DEBUG: ------- After SaveConfig 1

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 20 65 74 68 30 00 00 00  00 00 00 06 98 30 04 3E

DEBUG: C0 A8 01 0F FF FF FF 00  C0 A8 01 01 C0 A8 01 0F

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 40 00 C0 A8 01 1E 68 6F  6D 65 61 75 74 6F 2E 62     -> BootConf is
here also after Saving

DEBUG: 69 6E 00 00 00 00 00 00  00 00 00 00 00 00 00 00

DEBUG: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00

DEBUG: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: 14 FF FF FF C0 A8 01 01  82 95 11 15 00 00 00 00     -> Adress 256:
These settings are also here

DEBUG: 00 00 00 00 FF FF FF FF  FF FF FF FF FF FF FF FF

DEBUG: FF FF FF FF FF FF FF FF

------------------------------------------------------

 

 

Where may be the problem?? Is there a special timing for accessing
nonvolatile memory?

It seems that this problem only occurs if I call NutNetSaveConfig in the
httpd thread. Using the same code in the main loop without prior reading
works fine.

This problem occurs also with a custom Saving function which calls directly
NutNvMemSave (eg writing the settings at address 256).

 

Thanks for your help!!

 

Stefan