关于定时器的使用，设定定时器频率，出现报错

[clgd]

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[kidswong999]

请提供全部代码。

[clgd]

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[clgd]

此回复已被删除！

[clgd]

此回复已被删除！

[kidswong999]

请缩减成可以出现报错的最小完整代码。

[clgd]

@kidswong999

import sensor, image, pyb, os,time,utime
from pyb import Pin, Timer, LED

x = 640
y = 180
ROI = (0,300,x,y);

sensor.reset() # Initialize the camera sensor.
sensor.set_contrast(1)
sensor.set_gainceiling(16)
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.VGA)
sensor.set_windowing(ROI)
sensor.skip_frames(time = 1000) # Let new settings take affect.
sensor.set_auto_whitebal(False) # Turn off white balance.


extra_fb = sensor.alloc_extra_fb(x, y, sensor.GRAYSCALE)
extra_fbb = sensor.alloc_extra_fb(x, y, sensor.GRAYSCALE)

extra_fb.replace(sensor.snapshot())
extra_fbb.replace(sensor.snapshot())



def CheckingArea(picture):
    img = sensor.snapshot()
    img.difference(picture)
    stats = img.statistics()
    if (stats[5] > 50):
        return 1
    else:
        return 0

def systick(timer):            # we will receive the timer object when being called
    print("yes")

tim = pyb.Timer(2, freq=10)
tim.callback(systick)
#循环体
while(True):
    CheckingArea(extra_fb)

[clgd]

@kidswong999 发现如果有img = sensor.snapshot() 这句代码，就会出现定时器报错

import sensor, image, time
from pyb import Pin, Timer

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.

def systick(timer):            # we will receive the timer object when being called
    print("yes")


tim = Timer(2, freq=10)
tim.callback(systick)

while(True):
    clock.tick()                    # Update the FPS clock.
    img = sensor.snapshot()         # Take a picture and return the image.
    print(clock.fps())              # Note: OpenMV Cam runs about half as fast when connected
                                    # to the IDE. The FPS should increase once disconnected.

[kidswong999]

已经提交issue
https://github.com/openmv/openmv/issues/460

[clgd]

@kidswong999 这个问题无法解决吗？