串口接收有没有检测接收中断，怎么避免出现直接调用接收函数来等待检测接收的数据

可手动变焦的镜头是可以自己来调节焦距的大小的吧

import sensor, image, time ,math
from pyb import UART
import json
red_threshold   = (100, 38, 9, 51, 47, -82)
yellow_threshold = (100, 6, -40, -11, -69, 116)
black_threshold =(0, 25, -31, 26, 25, -44)
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(50)
sensor.set_auto_whitebal(False)
clock = time.clock()
uart = UART(3, 115200)
def find_max(blobs):
    max_size=0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob=blob
            max_size = blob[2]*blob[3]
    return max_blob

def find_red(blobs):
    max_size = 0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob=blob
            max_size = blob[2]*blob[3]
    return max_size

def line_filter_copy(src, dst):
  for i in range(0, len(dst), 1):
      dst[i] = src[i<<1]
def line_filter_bw(src, dst):
  for i in range(0, len(dst), 1):
      if (src[i<<1] > 200 and src[i<<1] < 255):
          dst[i] = 0xFF
      else:
          dst[i] = 0x00


i = 0
max_number = 0

while(True):

    clock.tick()
    lines = 0
    img = sensor.snapshot(line_filter = line_filter_copy)
    black_blobs = img.find_blobs([black_threshold])
    red_blobs = img.find_blobs([red_threshold])
    if black_blobs:
        max_blob=find_max(black_blobs)
        #print('sum :', len(blobs))
        if i == 0:
            img.draw_rectangle(max_blob.rect())
            img.draw_cross(max_blob.cx(), max_blob.cy())
        else :
            pass

        bx_x=max_blob.cx()-160
        by_y=120-max_blob.cy()
        x=math.fabs(bx_x)
        y=math.fabs(by_y)
        if 0 <= x < 10 :
            bx_value = 1
        elif 10 <= x < 100 :
            bx_value = 2
        else :
            bx_value = 3

        if 0 <= y < 10 :
            by_value = 1
        elif 10 <= y < 100 :
            by_value = 2
        else :
            by_value = 3


        b_output_str="x%d%d,y%d%d" % (bx_value,bx_x,by_value,by_y)
        #print('you send:',b_output_str)
        #uart.write(b_output_str+'\r\n')
    else:
        print('not found!')
        b_output_str = "0"
        #uart.write(b_output_str+'\r\n')

    #img = sensor.snapshot()
    #blobs = img.find_blobs([yellow_threshold])
    if red_blobs:
        max_blob=find_max(red_blobs)
        max_number=find_red(red_blobs)
        #print('sum :', len(blobs))
        if i == 1 :
            img.draw_rectangle(max_blob.rect())
            img.draw_cross(max_blob.cx(), max_blob.cy())
        else :
            pass

        x_x=max_blob.cx()-160
        y_y=120-max_blob.cy()
        x=math.fabs(x_x)
        y=math.fabs(y_y)
        if 0 <= x < 10 :
            x_value = 1
        elif 10 <= x < 100 :
            x_value = 2
        else :
            x_value = 3

        if 0 <= y < 10 :
            y_value = 1
        elif 10 <= y < 100 :
            y_value = 2
        else :
            y_value = 3

        output_str="x%d%d,y%d%d" % (x_value,x_x,y_value,y_y)
        #print('you send:',output_str)
        #uart.write(output_str+'\r\n')
    else:
        #print('not found!')
        output_str = "0"
        #uart.write(output_str+'\r\n')

    #print('max_number:',max_number)


    if max_number > 1250 :
        i = 1
        while(i):
            clock.tick()
            lines = 0
            img = sensor.snapshot(line_filter = line_filter_copy)
            red_blobs = img.find_blobs([red_threshold])
            if red_blobs:
                max_blob=find_max(red_blobs)
                max_number=find_red(red_blobs)
                #print('sum :', len(blobs))
                if i == 1 :
                    img.draw_rectangle(max_blob.rect())
                    img.draw_cross(max_blob.cx(), max_blob.cy())
                else :
                    pass

                x_x=max_blob.cx()-160
                y_y=120-max_blob.cy()
                x=math.fabs(x_x)
                y=math.fabs(y_y)
                if 0 <= x < 10 :
                    x_value = 1
                elif 10 <= x < 100 :
                    x_value = 2
                else :
                    x_value = 3

                if 0 <= y < 10 :
                    y_value = 1
                elif 10 <= y < 100 :
                    y_value = 2
                else :
                    y_value = 3

                output_str="x%d%d,y%d%d" % (x_value,x_x,y_value,y_y)
                #print('you send:',output_str)
                #uart.write(output_str+'\r\n')
            else:
                #print('not found!')
                output_str = "0"
                #uart.write(output_str+'\r\n')


            uart.write(output_str+'\r\n')
            print('you send red:',output_str)
            if max_number < 100 :
                i = 0
            else :
                i = 1
    else :
        uart.write(b_output_str+'\r\n')
        print('you send black:',b_output_str)
        i = 0

    max_number = 0

那有合适的其它镜头卖的吗，单独镜头

不是每次都会出现这种情况，只是偶尔会出现

焦距只能通过更换镜头来改变吗？不能通过代码来实现？

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