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III System Resources
To address demands of different customer, Module system provides abundant resources at user’s
use.
Notepad
The system sets aside a 512-bytes memory (16 pages* 32 bytes) for user’s notepad, where data
requiring power-off protection can be stored. The host can access the page by instructions of
PS_WriteNotepad and PS_Read Notepad.
Note: when write on one page of the pad, the entire 32 bytes will be written in wholly covering the
original contents.
The user can run the module address or random number command to configure the unique
matching between the module and the system. That is, the system identifies only the unique module.
If a module of the same type is replaced, the system cannot access the system.
Buffer
The module RAM resources are as follows:
An ImageBuffer: ImageBuffer
6 feature buffers: CharBuffer[1:6]
All buffer contents are not saved without power.
The user can read and write any buffer by instruction. CharBuffer can be used to store normal
feature files or store template feature files.
When uploading or downloading images through the UART port, only the high four bits of pixel
bytes are used to speed up the transmission, that is, use gray level 16, two pixels are combined into one
byte. (The high four bits are a pixel, the low four bits are a pixel in the next adjacent column of the same
row, that is, two pixels are combined into one byte and transmitted)
Since the image has 16 gray levels, when it is uploaded to PC for display (corresponding to BMP
format), the gray level should be extended (256 gray levels, that is, 8bit bitmap format).
Fingerprint Library
System sets aside a certain space within Flash for fingerprint template storage, that’s fingerprint
library. The contents of the fingerprint database are protected by power-off, and the serial number
of the fingerprint database starts from 0.
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 Configuration Parameters
The system allows the user to individually modify a specified parameter value (by parameter serial
number) by command. Refer to
SetSysPara
. After the upper computer sets the system parameter
instructions, the system must be powered on again so that the module can work according to the new