每次输出为none，怎么样让串口连续接收数字

[xhk5]

# Hello World Example
#
# Welcome to the OpenMV IDE! Click on the green run arrow button below to run the script!

import sensor, image, time
from pyb import UART
uart = UART(3, 115200)
sensor.reset()                      # Reset and initialize the sensor.
sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QVGA)   # Set frame size to QVGA (320x240)
sensor.skip_frames(time = 2000)     # Wait for settings take effect.
clock = time.clock()                # Create a clock object to track the FPS.
while(True):
    def jisuan():
        if uart.any():
            m=uart.readline()
            if(m!=b'o'):
                a=int(m.decode())
                clock.tick() 
        
                return a
    
        
    if uart.any():
        m=uart.readline()
        if(m!=b'o'):
            a=int(m.decode())
            clock.tick() 
            jisuan()                   # Update the FPS clock.
        b=str(jisuan())
            
        uart.write(b )

[xhk5]

也没有大佬救救啊！呜呜呜

[kidswong999]

你的需求我看不懂，你的代码我也看不懂。