4. openmv想要通过I2C总线发送一个浮点数的数组，怎么做？下图的代码有什么错误？
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    • openmv想要通过I2C总线发送一个浮点数的数组，怎么做？下图的代码有什么错误？

    • D
       

      import sensor, image, time
import pyb, ustruct # ustruct 用于打包和解压原始数据类型 的 "类"
import gc

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 300)
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()

K=560#the value should be measure

bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
bus.deinit() # 完全关闭设备
bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
print("Waiting for Arduino...")


while(True):
    length=0
    circlex=0
    circley=0
    clock.tick()
    img = sensor.snapshot().lens_corr(1.8)
    for c in img.find_circles(threshold = 2000, x_margin = 10, y_margin = 10, r_margin = 10,
            r_min = 2, r_max = 100, r_step = 2):
        area = (c.x()-c.r(), c.y()-c.r(), 2*c.r(), 2*c.r())
        circlex=c.x()
        circley=c.y()
        img.draw_rectangle(area, color = (255, 255, 255))#将非红色的圆用白色的矩形框出来
        Lm =  2*c.r()
        length = K/Lm
    print("FPS %f" % clock.fps())
    print("length:",length)
    output_strv=[length,circlex,circley]
    try:
        bus.send(len(output_strv), timeout=10000) # Send the len first (16-bits).
        try:
            for i in range(3):
                bus.send(output_strv[i], timeout=10000) # Send the data second.
                print("Sent Data!") # Only reached on no error.
        except OSError as err:
            pass # Don't care about errors - so pass.
            # Note that there are 3 possible errors. A timeout error, a general purpose error, or
            # a busy error. The error codes are 116, 5, 16 respectively for "err.arg[0]".
    except OSError as err:
        pass
    del img
    gc.collect()
      0
    • D

      没有报错，就是发送不出去

      0

    • 先测试例子: https://book.openmv.cc/example/02-Board-Control/arduino-i2c-slave.html

      补充:更推荐用串口发送

      0