Fluke 2635A user manual Appendices

Appendices	F
Memory Card File Formats

The following function will copy the configuration information from the data file into the ‘hydra’ structure, keeping track of the number of configured channels and filling the channel index table as it goes. It assumes that the first 730 bytes of the file have already been read into memory using the read () library function, or similar.

/*

-* convert_config(): Convert the file configuration data into C variables.

**

** Inputs:
**	file_data	Pointer to the first 730 bytes of data
**		from a Hydra Data Bucket file.
** Outputs:
**	hydra	Global variable set to the configuration
**		found in the file data.
**	max_index	number of channels in scan record and
**	index_to_chan	the table of non-off channels
**

**Returns:

**number of bytes per scan record.

*/

int

convert_config(unsigned char * file_data)

{

int ch;

/* Must be a data file (file_type must = 1) */ hydra.file_type = *file_data++;

/* Must be version 0 format */ hydra.file_format = *file_data++;

/* Copy tag */

memcpy(hydra.tag, file_data, 80); file_data += 80;

/* Must be configuration format zero */ hydra.setup_format = *file_data++;

/* Convert global configuration */ hydra.system = *file_data++; hydra.rate = *file_data++; hydra.trigger = *file_data++; hydra.format = *file_data++; hydra.total_debounce = *file_data++;

hydra.interval_bcd_hours = *file_data++; hydra.interval_bcd_minutes = *file_data++; hydra.interval_bcd_seconds = *file_data++;

hydra.ese = *file_data++; hydra.sre = *file_data++; hydra.iee = *file_data++;

hydra.log_status = *file_data++; hydra.log_filter = *file_data++; hydra.log_dest = *file_data++;

hydra.lock = *file_data++;

/* Convert channel configurations */

/* Count number of non-off channels during conversion */ max_index = 0;

for (ch=0; ch < 21; ch++) {

F-5