两个标志位为什么标志为2不能执行，
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import sensor, image,time,pyb,utime
import sensor, image, time,utime
from pyb import UART
p0 = pyb.Pin('P0', pyb.Pin.OUT_PP)
p0.value(1)
uart = UART(3, 19200)
output_str=0
yanse=0
flag=2
while 1:
if uart.any():
flag=uart.readline().decode()
flag=int(flag)
print(flag)
if flag==1:
sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.VGA)
sensor.set_windowing((240, 240)) # look at center 240x240 pixels of the VGA resolution.
sensor.skip_frames(30)
sensor.set_auto_gain(False) # must turn this off to prevent image washout...
clock = time.clock()
clock.tick()
img = sensor.snapshot()
img.lens_corr(0.1) # strength of 1.8 is good for the 2.8mm lens.
for code in img.find_qrcodes():
img.draw_rectangle(code.rect(), color = (255, 0, 0))
output_str="%s" % (code.payload())
uart.write(output_str)
print(output_str)
pyb.delay(500)
if output_str:
p0.value(0)
pyb.delay(10)
p0.value(1)
output_str=0
flag=0
if flag==2:
thresholds = [(54, 74, 44, 91, -16, 52),(76, 48, -22, 75, -76, -25),(68, 83, -47, -22, -7, 40)] # generic_blue_thresholds
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # must be turned off for color tracking
sensor.set_auto_whitebal(False) # must be turned off for color tracking
clock = time.clock()
utime.sleep_ms(2000)
img = sensor.snapshot()
blobs=img.find_blobs(thresholds, pixels_threshold=5000, area_threshold=400)
for blob in blobs:
img.draw_rectangle(blob.rect())
img.draw_cross(blob.cx(), blob.cy())
yanse="%s" % (blob.code())
uart.write(yanse)
print( yanse)
pyb.delay(500)
if yanse:
p0.value(0)
pyb.delay(10)
p0.value(1)
yanse=0
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代码缩进不对，逻辑不对。
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怎么修改呢，给一个提示可以吗
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第16行后面全部运行不到，因为在死循环外面。