Question

我尝试使用python和pyserial从串行监视器读取数据（我正在制作可以使用arduino游戏杆进行管理的游戏）。问题是我延迟读取x和y 3秒！是什么导致如此大的延迟，我该如何减少？

Arduino代码：

#define pinX    A2
#define pinY    A1
#define swPin    2 
#define ledPin  13

void setup() {
  Serial.begin(4800);

  pinMode(ledPin, OUTPUT);
  pinMode(pinX, INPUT);
  pinMode(pinY, INPUT);

  pinMode(swPin, INPUT);
  digitalWrite(swPin, HIGH);
}

void loop() {
  boolean ledState = digitalRead(swPin); 
  digitalWrite(ledPin, ledState);        

  int X = analogRead(pinX);             
  int Y = analogRead(pinY);            

  Serial.println(X);              
  Serial.println(Y);
}

Python代码：

import serial
from graphics import *
from pygame.locals import *
import time
import pygame
import math
ser=serial.Serial('COM5', baudrate=4800, timeout=10)
FPS = 10000000000
W = 1000
H = 500
WHITE = (255, 255, 255)
BLUE = (0, 70, 225)
dx = 0
dy = 0
V = 3
pygame.init()
sc = pygame.display.set_mode((W, H))
clock = pygame.time.Clock()
x = W // 2
y = H // 2
rotatex = 0
r = 50
running = True
while running:
    ser.flush()
    xr = int(ser.readline().decode('ascii').strip())
    yr = int(ser.readline().decode('ascii').strip())
    print(xr)
    print(yr)
    sc.fill(WHITE)
    car = pygame.image.load('car.png')
    track1 = pygame.image.load('track.png')
    car_rect = car.get_rect(center=(x, y))
    track1_rect = track1.get_rect(center=(500, 250))
    car = pygame.transform.rotate(car, rotatex)
    sc.blit(track1, track1_rect)
    sc.blit(car, car_rect)
    pygame.display.update()

    if yr < 490:
        if xr > 550:
            rotatex += yr / 515 + 1
        else:
            rotatex -= yr / 515 + 1
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
    if yr > 550:
        if xr > 550:
            rotatex -= yr / 515 + 1
        else:
            rotatex += yr / 515 + 1
    if rotatex >= 360:
        rotatex = 0
    if(rotatex < 0):
        rotatex = 360 + rotatex 
    if xr < 490:
        x = x + V * math.cos(math.radians(270-rotatex))
        y = y + V * math.sin(math.radians(270-rotatex))
    if xr > 550:
        x = x - V * math.cos(math.radians(270-rotatex))
        y = y - V * math.sin(math.radians(270-rotatex))
    clock.tick(FPS)
    pygame.event.pump()
pygame.display.quit()
pygame.quit()
sys.exit()

我尝试在serial.Serial 0中设置超时，但这给我一个错误：

xr = int（ser.readline（）。decode（'ascii'）。strip（））

ValueError：以10为底的int（）无效文字：

因为它不能这么快地读取数据。

为什么从arduino读取数据时会有这么大的延迟？

0 个答案: