LCD显示系统信息脚本

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from PCD8544 import PCD8544 as lcd
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import time
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import os
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import threading
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cpu_info=""
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time_info=""
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speed_down=[]
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speed_up=[]
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speed_name=[]
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# 显示cpu温度
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def cpu_t():
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    global cpu_info
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    while(True):
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        info=open('/sys/class/thermal/thermal_zone0/temp','r').read()
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        info=(int)(info)/1000
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        info=(str)(info)+'C'
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        cpu_info=info
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        time.sleep(1)
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# 显示开机运行时间
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def time_local():
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    global time_info
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    while(True):
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        info=os.popen('cat /proc/uptime| awk -F. \'{run_days=$1 / 86400;run_hour=($1 % 86400)/3600;run_minute=($1 % 3600)/60;run_second=$1 % 60;printf(\"%dD %d:%d:%d\",run_days,run_hour,run_minute,run_second)}\'')
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        info=info.read()
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        time_info=info
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        time.sleep(1)
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# 显示网卡速度
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def net_speed():
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    global speed_name
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    global speed_down
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    global speed_up
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    speed_down_1={}
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    speed_up_1={}
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    speed_net_time={}       #记录各网卡有网速的时间
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    while True:
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        info=open('/proc/net/dev','r').readlines()
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        for p in info:
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            p=p.split( )
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            if p[1].isdigit() and p[1] != 0:
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                index = 0
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                if p[0] in speed_name:
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                    index = speed_name.index(p[0])
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                    #若10秒后网速仍然为0就取消显示该网卡速度
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                    if (int)(time.time()) - speed_net_time.get(p[0],0) > 10 and speed_down_1.get(p[0]) == p[1] and speed_up_1.get(p[0]) == p[9]:
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                        del speed_name[index]
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                        del speed_down[index]
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                        del speed_up[index]
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                        speed_net_time[p[0]] = (int)(time.time())
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                    else:
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                        speed_down[index]=(float)((int)(p[1])-(int)(speed_down_1.get(p[0])))/1000
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                        speed_up[index]=(float)((int)(p[9])-(int)(speed_up_1.get(p[0])))/1000
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                        if speed_down[index] != 0 and speed_up[index] != 0:
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                            speed_net_time[p[0]] = (int)(time.time())
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                    speed_down_1[p[0]]=p[1]
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                    speed_up_1[p[0]]=p[9]
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                else:
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                    if speed_down_1.get(p[0],0) != p[1] and speed_up_1.get(p[0],0) != p[9]:
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                        speed_name.append(p[0])
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                        speed_down.append(0)
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                        speed_up.append(0)
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                        speed_down_1[p[0]] = p[1]
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                        speed_up_1[p[0]] = p[9]
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                    continue
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        time.sleep(1)
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def main():
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    a = lcd(dc=13, rst=5, sclk=26, din=19, cs=6, vcc=20, bl=21, bk=0)
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    a.begin(contrast=60)        #屏幕对比度
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    #各任务使用多线程运行
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    tmp=threading.Thread(target=time_local)
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    tmp.setDaemon(True)
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    tmp.start()
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    tmp=threading.Thread(target=cpu_t)
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    tmp.setDaemon(True)
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    tmp.start()
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    tmp=threading.Thread(target=net_speed)
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    tmp.setDaemon(True)
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    tmp.start()
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    t1=(int)(time.time())
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    index=0
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    while(True):
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        try:
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            t2=(int)(time.time())
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            a.clear()
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            a.draw_str(0,'CPU: '+cpu_info)
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            a.draw_str(1,time_info)
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            try:
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                # 网卡显示，10秒切换网卡信息
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                if t2-t1>10:
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                    t1=t2
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                    if index < len(speed_name)-1:
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                        index=index+1
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                    else:
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                        index=0
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                a.draw_str(2,speed_name[index]+" ("+(str)(index+1)+"/"+(str)(len(speed_name))+")")
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                a.draw_str(3,"D: "+(str)(speed_down[index])+"k/s")
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                a.draw_str(4,"U: "+(str)(speed_up[index])+"k/s")
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            except Exception as e:
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                pass
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            a.display()
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            time.sleep(1)
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        except KeyboardInterrupt:
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            a.quit()
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            exit(0)
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if __name__ == '__main__':
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    main()