【创龙科技 TL335x-EVM-S评估板试用体验】python开发之LED

2021-11-25 22:26:51 1733

0 1、今天测试一下python开发方式来点亮LED灯 2、通过向评估底板用户指示灯LED设备节点反复交替写入1、0数值，实现LED闪烁效果。LED点亮与熄灭时间均为0.5s。串口连接开发板， LED设备节点为“/sys/class/leds/user-ledX/”目录下的brightness 3、登录虚拟机里的Ubuntu环境，ping 一下开发板的IP,确保网络畅通 4、在指定目录下创建 tl_led_flash.py 文件 tl_led_flash.py 脚本 #!/usr/bin/env python # -- encoding: utf-8 -- ''' [url=home.php?mod=space&uid=1455510]@file[/url] : tl_led_flash.py [url=home.php?mod=space&uid=26400]@tiME[/url] : 2020/04/26 09:05:54 [url=home.php?mod=space&uid=284375]@desc[/url] : None ''' # here put the import lib import signal, time import os, sys, getopt version = "1.0" class Led(object): quit_flag = False def __init__(self, led_path): self.led_path = led_path # Led path self.leds = [] # Save the led found """ enumerate all led """ def enumerate_led(self): led_name = "user-led" """ find led """ for filename in os.listdir(self.led_path): if led_name in filename: self.leds.append(os.path.join(self.led_path, filename)) if len(self.leds) == 0: return False """ led sort, e.g. /sys/class/leds/user-led0 /sys/class/leds/user-led1 /sys/class/leds/user-led2 """ self.leds.sort() print "find leds:" for led in self.leds: print led return True """ control led flash """ def flash_led(self): led_num = len(self.leds) while not Led.quit_flag: """ Turn on leds """ for i in range(led_num): """ Set the led brightness value to 1 to turn on the led """ ret = os.system("echo 1 > %s/brightness" % (self.leds[i])) if ret != 0: print "Error: Failed to turn on %s" % self.leds[i] """ Keep the leds on for 500 ms """ time.sleep(0.5) for i in range(led_num): """ Set the led brightness value to 0 to turn off the LED """ os.system("echo 0 > %s/brightness" % (self.leds[i])) """ Keep the leds off for 500 ms """ time.sleep(0.5) @classmethod def stop(cls): cls.quit_flag = True def sig_handle(signum, frame): print "ctrl + c ..." Led.stop() def usage(): print "Usage: %s [options]n" "Options: n" " -v \| --version Display version informationn" " -h \| --help Display helpn" % sys.argv[0] if __name__ == '__main__': """ parse parameter """ try: options, remainder = getopt.getopt(sys.argv[1:], 'vh', ['version', 'help']) for opt, arg in options: if opt in ('-v', '--version'): print 'version: %s' % version exit(0) elif opt in('-h', '--help'): usage() exit(0) except getopt.GetoptError as err: print 'ERROR: %s' % err exit(1) """ Ctrl+c handler """ signal.signal(signal.SIGINT, sig_handle) led = Led("/sys/class/leds/") """ enumerate all led """ ret = led.enumerate_led() """ can not find led """ if not ret: print "can not find led!" exit(3) """ control flash all led """ print "nflash led ..." led.flash_led() 复制代码 5、通过 SCP 指令把文件传到开发板 6、使用 putty 软件，串口登录开发板，执行python脚本视频链接：https://www.bilibili.com/video/BV1AS4y1X7L5/ 由于试用时间已到，所有的测试也就此结束了，余兴未尽，也只能先这样了，祝创龙科技越做越好，期待再相遇！！！ 0 0016.png (65.03 KB, 下载次数: 0)
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