[En-Nut-Discussion] saving data to the eeprom

[Peter Sodermanns]

Peter Gaskell schrieb:
> I wish to save some data in the EEPROM so it will load at startup, in  
> case of power failure etc.  I've looked in the API, it mentions  
> NutSaveConfig(), how can i give my data a home in the Config?
> 
> -peter
> 
> _______________________________________________
> En-Nut-Discussion mailing list
> En-Nut-Discussion at egnite.de
> http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion
> 

Hi Peter,

I found the clue in the nutpiper example, file config.c.

My parameter values are defined in a global struct gp, and I use these 
(modified) functions to read them at startup and to save them on change:


//----------------------------------------------------------------------------------------
// Load configuration from EEPROM.
// return 0 on success, -1 if no configuration data had been found.
//----------------------------------------------------------------------------------------
int ConfigLoad(void)
{
int rc;
int addr;
char *buf;
int oldaddr;

	rc = -1;
	addr = CONFAPP_EE_OFFSET;
	buf = malloc(MAXLEN_URL + 1);
	if (NULL != buf) {
		addr += ConfigLoadString(addr, buf, sizeof(CONFAPP_EE_NAME));
//		printf("  Anwendung = %s\n", buf);
		if (strcmp(buf, CONFAPP_EE_NAME) == 0) {
			rc = 0;
			oldaddr = addr;
			addr += ConfigLoadBinary(addr, gp, sizeof(TGlobalPar));
//			printf("  %d Konfigurationsbytes vom EEPROM gelesen.\n", addr-oldaddr);
		}
		free(buf);
	}
//	printf("  %d WR\n", gp->AnzWr);
//	printf("	Gruppe %s\n", gp->Name);
	return rc;
}

//----------------------------------------------------------------------------------------
// Save configuration into EEPROM.
//----------------------------------------------------------------------------------------
void ConfigSave(void)
{
int addr = CONFAPP_EE_OFFSET;
int oldaddr;

	NutNetSaveConfig();
	/* Save our name. */
	oldaddr = addr;
	addr += ConfigSaveString(addr, CONFAPP_EE_NAME);
	/* Save radio control. */
	oldaddr = addr;
	addr += ConfigSaveBinary(addr, gp, sizeof(TGlobalPar));
//	printf("Anwendung %s: %d Bytes ins EEPROM gesichert.\n", 
CONFAPP_EE_NAME, addr-oldaddr);	
}