import sensor, image,time,lcd
from pyb import UART,Timer,LED

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)#320*240
sensor.set_framesize(sensor.VGA)
sensor.set_windowing((240, 240))

sensor.skip_frames(30)
sensor.set_auto_whitebal(False)      #关闭白平衡
sensor.set_auto_gain(False)          #关闭自动增益
clock = time.clock()
lcd.init()                           #Initialize the lcd screen.
uart = UART(3,115200,8,None,1)       #创建串口对象

data = []
buff=[0,0,0,0,0,0,0,0]

LED_Red = LED(1)
LED_Green = LED(2)
LED_Blue = LED(3)


tim = Timer(4,freq=1)              # create a timer object using timer 4
#tim.callback(tick)
tim.deinit()

FlagOK = 0
show_numTab = ["0","1","2","3","4","5","6","7","8","9"]
num = 0
returnData = [0x55,0x02,0x92,0x02,0x02,0x00,0x00,0xBB]  #识别失败
runData    = [0x55,0x02,0x92,0x03,0x02,0x00,0x00,0xBB]  #正在识别

#定时器回调函数
def tick(timer):            # we will receive the timer object when being called
    global FlagOK,num,returnData
    print("Timer callback")
    num = num-1
    if(num == 0):
        num = 9
        FlagOK = 2
        tim.deinit()

#串口发送函数
def USART_Send(src,length):
    for i in range(length):
        uart.writechar(src[i])


#   二维码识别，并返回识别结果
def Color_Check(srcbuf):
    global FlagOK,num
    if(FlagOK == 1):
        img.draw_string(100, 180,"open"+show_numTab[num],color=[255,0,0])
        for code in img.find_qrcodes():
                FlagOK = 0
                tim.deinit()
                print(code)
                qr_Tab = code.payload()
                uart.writechar(0x55)
                uart.writechar(0x02)
                uart.writechar(0x92)
                uart.writechar(0x01)
                uart.writechar(len(qr_Tab))
                for qrdata in qr_Tab:
                    uart.writechar(ord(qrdata))
                uart.writechar(0xBB)

    if(FlagOK == 2):
        for rdata in returnData:
            uart.writechar(rdata)
        FlagOK = 0


while(True):


    img = sensor.snapshot()

    if(uart.any()):
        time.sleep(200)
        data = uart.read(8)
        #uart.readinto(buf,8)
        #data = uart.readline()
        #print(buf)
        if( len(data) >= 8):
            if((data[0] == 0x55)&(data[1] == 0x02)&(data[7] == 0xBB)):
                if(data[2] == 0x92):
                    print("识别二维码")
                    if(data[3] == 0x01):    #启动识别
                        if(FlagOK == 0):
                            FlagOK = 1
                            num = 9
                            print("开始识别")
                            tim.callback(tick)
                        else:
                            print("正在识别")
                            for rdata in runData:
                                print(rdata)
                                uart.writechar(rdata)
                    if(data[3] == 0x02):
                        print("停止识别")
                        FlagOK = 2
                        tim.deinit()       #定时器停止

    Color_Check(data)

    lcd.display(img)

通过USB-TTL发送串口55 02 92 01 00 00 93 BB识别命令，但发一次或者两次过后，OPENMV进行卡屏，只能拔电重启？

@kidswong999 你能不间断得发么？1s 一次这样也不死机么？

@kidswong999 大概网页那个位置下载，我是有发数据，也接收到数据，为什么OPENMV会死机我就不清楚了，换个串口助手看看

@kidswong999 串口助手可以提供一下下载链接么？

@kidswong999 是整个openmv程序都不运行了，openmv停止了，需要重新上电

# Untitled - By: Administrator - 周四 二月 28 2019
import sensor, image,time,lcd
from pyb import UART,Timer,LED


sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)#320*240
sensor.set_framesize(sensor.VGA)
sensor.set_windowing((240, 240))
sensor.skip_frames(time = 2000)
#sensor.skip_frames(30)
#sensor.set_auto_whitebal(False)      #关闭白平衡
sensor.set_auto_gain(False)          #关闭自动增益
clock = time.clock()
lcd.init()                           #Initialize the lcd screen.

uart = UART(3, 115200)
uart.init(115200, bits=8, parity=None, stop=1) # init with given parameters


def sending_data():
    global uart


def recive_data():
    global uart

    if uart.any():
        tmp_data = uart.readline()
        uart.write(tmp_data)
        #print(tmp_data)

while(True):
    img = sensor.snapshot()
    img.lens_corr(0.3) # strength of 1.8 is good for the 2.8mm lens.
    sending_data()
    recive_data()
    lcd.display(img)