ICP DAS

MiniOS7 microSD Library

The microSD memory expansion features a data logging ability on the MiniOS7 based PACs. The microSD library can operate files on the microSD card that was previously formatted as the standard FAT file system. That means the program on the MiniOS7 based PACs can create a file and log data to the file. When the logging is completed, the user can take out the microSD card and then copy/open files in it to/on the PC.

ITEM	DESCRIPTION
microSD Capacities Supported	1 GB, 2 GB, 4 GB, 8 GB, 16 GB and 32 GB microSD card
File system	FAT32 file system only. You can format the microSD card as FAT format on PC or call pc_format to perform the formatting on the MiniOS7 based PACs.
Disk number	1
File number	65,517 files max.
File size	2 GB max. for each file
File name	12 bytes max. (8-3 format)
File operation modes	1. Read. 2. Write: creates a new file to write data, or overwrite to a file (if the file is already exit). 3. Append: appends data to a file.
File handle	6 max.
Read/Write performance	Hardware: uPAC-5001 Condition 1: 32767 bytes x 10 loops, pc_read = 125.3 KB/Sec, pc_write = 95.3 KB/Sec Condition 2: 500 bytes x 100 loops, pc_read = 47 KB/Sec, pc_write = 12 KB/Sec
Max. length of read/write data	32767 bytes

FAT File System
The FAT file system is an old but very common file system. It can store a max. of 65517 files. Users can create files and then write/append data to it on the MiniOS7 base PACs. Then copy the file to a PC for post analysis when the data is complete logged.
C Language API
Following functions are similar to the functions that turbo C and Borland C provide. This helps users short the learning of using the microSD library. pc_open, pc_close, pc_read, pc_write, pc_seek, pc_tell, pc_eof, pc_get_errno, pc_format, pc_del, pc_mkdir, pc_rmdir, … etc.