Why my files are empty every time I restast the RCM4300???

Question

Dear all,

My application is running on a RCM4300. The program is intended to acquire data and store them in the on-board SD Card, additionally there's an FTP Server in charge to provide access to the stored data. The FTP Server is running as a Costate.

In principle it works fine. The problem is that after restarting the module the data in the files desappear. The files are there but not the data.

Any ideas?

Answer 1

Do you have a battery connected for the RTC and SRAM? The FAT file system needs a block of battery backed RAM to work correctly over power cycles.

Regards,
Peter

Answer 2

Hello, There is a sample application FTP_FAT.C provided by Digi under C:\DCRABBIT_10.72\Samples\tcpip\ftp

Test the RCM4300 with this sample app.

Answer 3

Yes I have a battery, but I didn't know such effect. I will check the voltage through the power up cycle.

The other possibility I'm thinking of is related to some sort of uncompatibility between the FAT_file and the SSPEC library functions. If the battery back up works fine I will be back with a more detailed Explanation on the Problem.

Thanks for the help
Andreu

Answer 4

I already checked the back up battery. It Looks to be Ok. However, is a Kind of noisy. It shows spykes of about 1 Vpp. I will Change the battery anyway.

Here a little piece of my code. Please let me know if you see anything weird:


in my custom json library:

/* START FUNCTION DESCRIPTION *****************
json_addValueNumber <json.LIB>
SYNTAX: int json_addValueNumber(FATfile *file, void *value, int type, const far char *after)

KEYWORDS: json

DESCRIPTION: function to write numerical values into a json formatted file.

END DESCRIPTION ********************************************/
int json_addValueNumber(FATfile *file, void *value, int type, const far char *after)
{
auto int rc=0;
switch(type)
{
case UCHR:
sprintf(buf, "%c\0",*(unsigned char*)value);
break;
case UINT:
sprintf(buf, "%u\0",*(unsigned int*)value);
break;
case INT:
sprintf(buf, "%d\0",*(int*)value);
break;
case USINT:
sprintf(buf, "%u\0",*(unsigned short*) value);
break;
case FLOAT:
sprintf(buf, "%.2f\0",*(float*)value);
break;
default:
break;
}
if(after!=NULL) f_strcat(buf, after);
rc=fat_xWrite(file, (long)buf, strlen(buf));
return rc;
}


in the main program:

// Mount SD card

fCheckError(sspec_automount(SSPEC_MOUNT_ANY, NULL, NULL, NULL),FailedFunct017,"!=",0);

while(1)
{
loophead();
costate 1 //...
costate 2 //...
costate // data logging
{
waitfor(DelaySec(DataReg_T));
if (Exp_running == 1)
{
sprintf(s,DataTmp);
fCheckError(fat_Open(fat_part_mounted[0],s,FAT_FILE,FAT_OPEN,&DataTemp_file,&prealloc),FailedFunct041,"!=",0);
fat_Seek(&DataTemp_file, -6, SEEK_END);
fCheckError(fat_Write(&DataTemp_file,",\r\n",3),FailedFunct032,"!=",3);
sprintf(s,"#%d\0",meascount);
json_addName(&DataTemp_file,NULL,s,"[");
json_addValueNumber(&DataTemp_file,(unsigned int*)&Stirring,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&InternalTemp,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&FeedTemp,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&HumidifierTemp,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&MBRTemp,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&DO,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&pHbis,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&P1,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&P2,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&P3,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&Flow1,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&Flow2,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&Flow3,FLOAT,",");
json_addValueNumber(&DataTemp_file,(unsigned int*)&ElapsedTime,FLOAT,"]");
fCheckError(fat_Write(&DataTemp_file,"\r\n}\r\n}",6),FailedFunct032,"!=",6);
fCheckError(fat_Close(&DataTemp_file),FailedFunct042,"!=",0);
meascount++;
}
}
}




Somewhere else before powering down:



// Unmount all of the mounted FAT partitions & devices before exit
for (i = 0; i < num_fat_devices * FAT_MAX_PARTITIONS;i += FAT_MAX_PARTITIONS)
{
if (fat_part_mounted) fat_UnmountDevice(fat_part_mounted->dev);
}