CamDecoder - Camera Scan Code

Class feature: Camera code scanning.

Note: Please initialize the LCD before enabling preview feature.

Example:

from machine import LCD
import camera

# Initialize the LCD object based on the contents of the machine.LCD class before enabling preview feature
# lcd = LCD()
# lcd.lcd_init(*args)

# The LCD object can be left uninitialized if there is no need to enable preview feature

# Define a callback function
def scan_callback(para):
    # para[0] Scan result 	0: Success Other: Failure
    print("scan result is ", para[0])		
    # para[1] Decode content
    if para[0] == 0:
        print("decode content is ", para[1]) 

# Create a camScandecode object
scaner = camera.camScandecode(0,1,640,480,1,240,240)

# Enable camera scanning feature
scaner.open()

# Register scanning callback function
scaner.callback(scan_callback)

# Start scanning
scaner.start()

# Stop scanning
scaner.stop()

# Disable camera scanning feature
scaner.close()

Constructor

camera.camScandecode

class camera.camScandecode(model,decode_level,cam_w,cam_h,perview_level,lcd_w,lcd_h)

Creates a camScandecode object.

Parameter：

• model - Integer type. Camera model. It can be set to 0 or 1. Click here for corresponding camera model.
• decode_level - Integer type. Decoding level. Fill with 1 or 2 on EC600N series, EC800N series, EC600M series and EC800M series modules. The higher the level, the smoother the image, and the more resources consumed. Fill with 1 on other modules.
• cam_w - Integer type. Camera horizontal resolution. Please fill in according to the specifications of the corresponding camera model.
• cam_h - Integer type. Camera vertical resolution. Please fill in according to the specifications of the corresponding camera model.
• perview_level - Integer type. Preview level. Fill with 1 or 2 on EC600N series, EC800N series, EC600M series and EC800M series modules. The higher the level, the smoother the image, and the more resources consumed. Fill with 1 on other modules.
• lcd_w - Integer type. LCD horizontal resolution. Please fill in according to the specifications of the LCD actually used.
• lcd_h - Integer type. LCD vertical resolution. Please fill in according to the specifications of the LCD actually used.

Corresponding Camera Model:

Method

camScandecode.open

camScandecode.open()

This method enables the camera code scanning feature.

Parameter：

None

Return Value：

0 - Successful execution; Other values - Failed execution.

camScandecode.close

camScandecode.close()

This method disables the camera code scanning feature.

Parameter：

None

Return Value：

0 - Successful execution; Other values - Failed execution.

camScandecode.start

camScandecode.start()

This method starts the camera code scanning.

Parameter：

None

Return Value：

0 - Successful execution; Other values - Failed execution.

camScandecode.stop

camScandecode.stop()

This method stops the camera code scanning.

Parameter：

None

Return Value：

0 - Successful execution; Other values - Failed execution.

camScandecode.pause

camScandecode.pause()

This method pauses the camera code scanning.

Parameter：

None

Return Value：

0 - Successful execution; Other values - Failed execution.

camScandecode.resume

camScandecode.resume()

This method resumes the camera code scanning.

Parameter：

None

Return Value：

0 - Successful execution; Other values - Failed execution.

camScandecode.callback

camScandecode.callback(cb)

This method sets the scanning callback function.

Parameter：

• cb - Scanning callback function. The prototype is as follows:

  cb(result_list)
  

  Parameter of the Callback Function：

  • result_list[0] - Integer type. The scanning result. 0 indicates successful execution and other values indicate failed execution.

  • result_list[1] - String type. The scanning content.

Return Value：

0 - Successful execution; Other values - Failed execution.