openmv串口数据输出问题

[b2em]

输出值有的时候比打印出来的数据少6
下面是打印出来的数据
下面是串口助手收到的数据

下面是openmv源码



请问是哪里出了问题？

[kidswong999]

如果涉及代码，需要报错提示与全部代码文本，请注意不要贴代码图片

[b2em]

此回复已被删除！

[b2em]

@kidswong999
没有报错，是输出数据与打印数据有差异

[b2em]

@kidswong999
import sensor, image, time, math
from pyb import UART,LED
import json
import ustruct

#white_threshold_01 = ((95, 100, -18, 3, -8, 4)); #白色阈值
red_threshold_01 = ((17, 67, 23, 71, -1, 45));
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()

red_led =LED(1)
green_led =LED(2)
blue_led=LED(3)

uart = UART(3,500000) #定义串口3变量
uart.init(500000, bits=8, parity=None, stop=1) # init with given parameters

def find_max(blobs): #定义寻找色块面积最大的函数
max_size=0
for blob in blobs:
if blob.pixels() > max_size:
max_blob=blob
max_size = blob.pixels()
return max_blob

def USART_SendData(fx,dx,fy,dy):
global uart;
#frame=[0x2C,18,cx%0xff,int(cx/0xff),cy%0xff,int(cy/0xff),0x5B];
#data = bytearray(frame)
data = ustruct.pack("<bbhhhhb", #格式为俩个字符俩个短整型(2字节)
0xFF, #帧头
0xFE,
int(fx), # up sample by 4 #数据1
int(dx),
int(fy), # up sample by 4 #数据2
int(dy),
0xFD)
uart.write(data); #必须要传入一个字节数组

def recive_data():
global uart
if uart.any():
tmp_data = uart.readline();
print(tmp_data)

#mainloop
while(True):
clock.tick() # Track elapsed milliseconds between snapshots().
img = sensor.snapshot() # Take a picture and return the image.
# pixels_threshold=100, area_threshold=100
blobs = img.find_blobs([red_threshold_01], area_threshold=150);
cx=0;cy=0;

if blobs:
    #如果找到了目标颜色
    max_b = find_max(blobs);
    # Draw a rect around the blob.
    img.draw_rectangle(max_b[0:4]) # rect
    #用矩形标记出目标颜色区域
    img.draw_cross(max_b[5], max_b[6]) # cx, cy
    img.draw_cross(160, 120) # 在中心点画标记
    #在目标颜色区域的中心画十字形标记
    cx=max_b[5];
    cy=max_b[6];
    img.draw_line((160,120,cx,cy), color=(127));
    #img.draw_string(160,120, "(%d, %d)"%(160,120), color=(127));
    img.draw_string(cx, cy, "(%d, %d)"%(cx,cy), color=(127));
    fx=cx//10
    fy=cy//10
    dx=fx/10
    dy=fy/10
    USART_SendData(fx,dx,fy,dy) #发送点位坐
    print('整数：%d '%fx,'余数：%d '%dx,'整数：%d '%fy,'余数：%d '%dy);
    time.sleep(5);
    recive_data();
    blue_led.off()
    red_led.off()
    green_led.on()
else:
    blue_led.off()
    green_led.off()
    red_led.on()

    if uart.any():
        tmp_data = uart.readline();
        blue_led.on()
        green_led.off()
        red_led.off()