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 |
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.
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.
This package contains microSD libraries and demo samples.
FILE NAME | RELEASE DATE | SIZE | DOWNLOAD |
---|---|---|---|
microsd.rar | 2014/05/13 | 182 KB |
This package consists of the following folder and files:
lib folder for MFS Libraries
FOLDER | DESCRIPTION |
---|---|
- | microSD Libraries microSD.h SD_V106.LIB microSD_History_V106.txt |
demo folder for microSD Demo Samples
FOLDER | DESCRIPTION |
---|---|
sd_qa | Shows how to connect and control the microSD. |
sd_read | |
sd_util | |
sd_write |