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我正在使用来自网站的一段代码，这是我正在使用的部分：

import pygame
from pygame.locals import *
import os
from time import sleep
import RPi.GPIO as GPIO

#Setup the GPIOs as outputs - only 4 and 17 are available
GPIO.setmode(GPIO.BCM)
GPIO.setup(4, GPIO.OUT)
GPIO.setup(17, GPIO.OUT)

#Colours
WHITE = (255,255,255)

os.putenv('SDL_FBDEV', '/dev/fb1')
os.putenv('SDL_MOUSEDRV', 'TSLIB')
os.putenv('SDL_MOUSEDEV', '/dev/input/touchscreen')

pygame.init()
pygame.mouse.set_visible(False)
lcd = pygame.display.set_mode((320, 240))
lcd.fill((0,0,0))
pygame.display.update()

font_big = pygame.font.Font(None, 50)

touch_buttons = {'17 on':(80,60), '4 on':(240,60), '17 off':(80,180), '4 off':(240,180)}

for k,v in touch_buttons.items():
    text_surface = font_big.render('%s'%k, True, WHITE)
    rect = text_surface.get_rect(center=v)
    lcd.blit(text_surface, rect)

pygame.display.update()

while True:
    # Scan touchscreen events
    for event in pygame.event.get():
        if(event.type is MOUSEBUTTONDOWN):
            pos = pygame.mouse.get_pos()
            print pos
        elif(event.type is MOUSEBUTTONUP):
            pos = pygame.mouse.get_pos()
            print pos
            #Find which quarter of the screen we're in
            x,y = pos
            if y < 120:
                if x < 160:
                    GPIO.output(17, False)
                else:
                    GPIO.output(4, False)
            else:
                if x < 160:
                    GPIO.output(17, True)
                else:
                    GPIO.output(4, True)
    sleep(0.1)

当我运行它（使用 root 权限）时，我收到此错误：

  File "touchscreen.py", line 20, in <module>
    pygame.mouse.set_visible(False)
pygame.error: video system not initialized

我正在尝试为我的项目在树莓派触摸屏上创建一个简单的按钮界面，欢迎任何工作解决方案。修复此代码对我来说无关紧要，替代代码同样有效。

谢谢，

马修·伍德

4

2 回答 2

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我已经解决了这个问题，解决方案是输入设备被称为 mouse0 而不是触摸屏。

于 2015-03-29T12:40:52.103 回答
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尝试这个：

disp_no = os.getenv('DISPLAY')
if disp_no:
    print "I'm running under X display = {0}".format(disp_no)
    pygame.mouse.set_visible(True)

else:
    drivers = ['directfb', 'fbcon', 'svgalib']
    found = False
    for driver in drivers:
        if not os.getenv('SDL_VIDEODRIVER'):
            os.putenv('SDL_VIDEODRIVER', driver)
        try:
            pygame.display.init()
        except pygame.error:
            print 'Driver: {0} failed.'.format(driver)
            continue
        found = True
        pygame.mouse.set_visible(False)
        break

    if not found:
        raise Exception('No suitable video driver found!')

os.environ["SDL_FBDEV"] = "/dev/fb1"
os.environ["SDL_MOUSEDEV"] = "/dev/input/touchscreen"
os.environ["SDL_MOUSEDRV"] = "TSLIB"

例如直接在您的 for k,v 行上方

这将尝试在 X-Windows 中运行（使用可见的鼠标指针，或者在最好的可用帧缓冲区驱动程序中）

于 2015-08-25T08:45:00.070 回答