mv--定时做什么事，定时器

# 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 Pin, Timer, LED


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.

is_need_send_data = False # 是否需要发送数据的信号标志
def uart_time_trigger(timer):
    '''
    串口发送数据的定时器，定时器的回调函数  False
    '''
    global is_need_send_data
    is_need_send_data = True
    
tim = Timer(4, freq=2)
# 设定定时器的回调函数
tim.callback(uart_time_trigger)

clock = time.clock()                # Create a clock object to track the FPS.
from pyb import RTC

rtc = RTC()
rtc.datetime((2013, 7, 9, 2, 0, 0, 0, 0))
while(True):
    if not is_need_send_data:
        # 不需要发送数据
        continue
    is_need_send_data = False
    clock.tick()                    # Update the FPS clock.
    img = sensor.snapshot()         # Take a picture and return the image.
    #time_data = time.ticks()
    #time_data = time_data//1000
    #minute = time_data//60
    #second = time_data%60
    #time_show =  "minute:%d second:%d" % (minute,second)
    #print(time_show)
    print(clock.fps())              # Note: OpenMV Cam runs about half as fast when connected
    print(rtc.datetime())
                                  

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