Introduction
Based on quecpthon, this document introduces how to realize camera preview, code scanning and photographing functions through camera module, including interface, configuration process and examples.
At present, quecpython supports two kinds of camera ICs. Subsequent updates will continue
-Bf3901 (8W pixels)
-Gc032a (30W pixels)
The following experiments take gc032a as an example
Schematic analysis
Firstly, the schematic diagram is analyzed to determine the model and pin configuration of camera
Pins: SCK, SDA (IIC pin is used to configure and read the register of sensor)
MCLK: master clock provided to sensor
SPI_ CLK: SPI clock output from sensor to module
Data0: camera SPI data bit 0
Dara1: camera SPI data bit 1
Pwdn: camera off
Camera related interfaces
The camera interface mainly refers to the wiki ([camera_api library] on the official website(Quectel QuecPython 类库API说明)）
Camera configuration development process
LCD initialization (not required)
If the preview function is required in this part, the LCD needs to be initialized first.
For specific implementation, refer to (LCD instructions）
Preview function
This part only realizes the preview function of the device.
import camera
preview1 = camera.camPreview(0,640,480,240,320,2)
preview1.open()
preview1.close()
Code scanning function
This part realizes preview and code scanning functions.
def sacn_call(para):
print(para)
import camera
Scan = camera.camscandecode (0,1640480,2240320) # requires preview function and LCD
# Scan = camera.camscandecode (0,1640480,0) # no preview function is required, i.e. no LCD
scan.open()
scan.start()
scan.callback(sacn_call)
Photographing function
This part of the function realizes the preview and photographing functions.
def cap_call(para):
print(para)
import camera
cap = camera.camCaputre(0,640,480,0,240,320)
cap.open()
cap.callback(cap_call)
cap.start(240,320,'1')
Appendix a abbreviations of terms
Table 2: Abbreviations of terms
abbreviation Full English name Full Chinese name
LCD Liquid Crystal Display Liquid crystal display
SPI Serial Peripheral Interface Serial peripheral interface