ICP DAS 泓格科技

MiniOS7 microSD Library

部份 MiniOS7 的 PAC 具有 microSD 記憶卡卡槽，可以透過 microSD library 來讀寫 microSD 卡，但是必需預先將記憶卡格式化成 FAT 格式的檔案系統。當資料儲存完畢後，除了將記憶卡拿到 PC 上讀取，也可以透過 PAC 中的程式，由網路上傳到 FTP server。

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.