ESP32-CAM处理多工-使用计时器 - uPython

先前有介绍过多种多工的方式，使用软件：_thread；使用硬件中断：定时器触发与引脚上的电压变化，在此用定时器触发的方式，让 ESP32-CAM 同时可以处理网页的画面，另一方面还可以控制灯光的闪烁。

timer.py

from microdot import Microdot,  send_file
from machine import Timer, Pin
import time

# LED状态反转
def toggle_led(led_pin):
    led_pin.value(not led_pin.value())

def led_blink_timed(timer, led_pin, millisecond):
    period = int(0.5 * millisecond)
    timer.init(period=period, mode=Timer.PERIODIC, callback=lambda t: toggle_led(led_pin))

timer = Timer(1)  
app = Microdot()

@app.route('/', methods=['GET', 'POST'])
def index(request):
    response = send_file('hello.html')
    print(request.args)
    return response

@app.route('/pin', methods=['GET', 'POST'])
def index(request):
    if 'value' not in request.args:
        return 'format is URL/pin?value=x&time=y'
    pin = int(request.args['value'])
    time = int(request.args['time']) if 'time' in request.args else 500
    led_pin = Pin(pin, Pin.OUT)
    led_blink_timed(timer, led_pin, millisecond=time)

app.run(debug=True)

浏览器画面
hello.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>ESP32-CAM</title>
    <meta name="robots" content="index,follow">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
  </head>
  <body>
  <h1>这是esp32-cam多工示例</h1> 
  <p><a href="/pin?time=100&value=4">闪光灯 LED 短闪</a>
  <p><a href="/pin?time=600&value=4">闪光灯 LED 慢闪</a>
  <p><a href="/pin?time=100&value=33">红灯 LED 短闪</a>
  <p><a href="/pin?time=600&value=33">红灯 LED 慢闪</a>
  </body>
</html>

参考资料

microdot, https://github.com/miguelgrinberg/microdot
A Simple Microdot Web Server, https://microdot.readthedocs.io/en/latest/

ESP32-CAM处理多工-使用计时器 - uPython

ESP32-CAM处理多工-使用计时器 - uPython

参考资料

猜你喜欢