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III System Resources

To address demands of different customer, Module system provides abundant resources at user’s

use.

Notepad

512-byte memory is set aside in flash for User’s notepad. The notepad is

divided into 16 pages logically, 32 bytes per page. The host can access any page by

instruction GR_WriteNotepad or GR_ReadNotepad.

Note: when written, the whole page is taken as a whole and its former contents will

be replaced.

Buffer

There are an image buffer and two 512-byte-character-file buffer within the RAM space of the

module. Users can read & write any of the buffers by instructions.

Note: Contents of the above buffers will be lost at power-off.

Image buffer

ImageBuffer serves for image storage and the image format is 256*288 pixels, form is BMP.

When transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred

(that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the

transferring. When uploaded to PC, the 16-grey-degree image will be extended to 256-grey-degree

format. That’s 8-bit BMP format.

When transferring through USB, the image is 8-bit pixel, that’s 256 grey degrees.

Character file buffer

Character file buffer, CharBuffer1, CharBuffer2, can be used to store both character file and

template file.

Fingerprint Library

Synstem sets aside a certain space within Flash for fingerprint template storage, that’s fingerprint

library. Contents of the library remain at power off.

Capacity of the library changes with the capacity of Flash, system will recognize the latter

automatically. Fingerprint template’s storage in Flash is in sequential order. Assume the fingerprint

capacity N, then the serial number of template in library is 0, 1, 2, 3 … N. User can only access

library by template number.

System Confiuration Parameter

To facilitate user’s developing, Module opens part system parameters for use. And the basic

instructions are SetSysPara & ReadSysPara. Both instructions take Parameter Number as