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龍芯派運行python flask web服務器，訪問頁面可讀取和控制gpio狀態
pip install flask
pip install python-periphery
pip install Werkzeug
pip install jinja2
pip install click
pip install itsdangerous
創建app.py
from periphery import GPIO
from flask import Flask, render_template, request
app = Flask(__name__)
# Create a dictionary called pins to store the pin number, name, and pin state:
pins = {
55 : {'name' : 'GPIO 55', 'state' : False}
}
# Set each pin as an output and make it low:
for pin in pins:
gpio_out = GPIO(pin, "out")
gpio_out.write(False)
@app.route("/")
def main():
# For each pin, read the pin state and store it in the pins dictionary:
for pin in pins:
pins[pin]['state']=gpio_out.read()
# Put the pin dictionary into the template data dictionary:
templateData = {
'pins' : pins
}
# Pass the template data into the template main.html and return it to the user
return render_template('main.html', **templateData)
# The function below is executed when someone requests a URL with the pin number and action in it:
@app.route("/<changePin>/<action>")
def action(changePin, action):
# Convert the pin from the URL into an integer:
changePin = int(changePin)
# Get the device name for the pin being changed:
deviceName = pins[changePin]['name']
# If the action part of the URL is "on," execute the code indented below:
if action == "on":
# Set the pin high:
gpio_out.write(True)
# Save the status message to be passed into the template:
message = "Turned " + deviceName + " on."
if action == "off":
gpio_out.write(False)
message = "Turned " + deviceName + " off."
# For each pin, read the pin state and store it in the pins dictionary:
for pin in pins:
pins[pin]['state']=gpio_out.read()
# Along with the pin dictionary, put the message into the template data dictionary:
templateData = {
'pins' : pins
}
return render_template('main.html', **templateData)
if __name__ == "__main__":
app.run(host='0.0.0.0', port=80, debug=True)
保存退出。
建立templates目錄，在其下創建main.html
<!DOCTYPE html>
<head>
<title>Loongson Web Server</title>
</head>
<body>
<h1>Loongson Web Server</h1>
{% for pin in pins %}
<h2>{{ pins[pin].name }}
{% if pins[pin].state == true %}
is currently <strong>on</strong></h2><div class="row"><div class="col-md-2">
<a href="/{{pin}}/off" class="btn btn-block btn-lg btn-default" role="button">Turn off</a></div></div>
{% else %}
is currently <strong>off</strong></h2><div class="row"><div class="col-md-2">
<a href="/{{pin}}/on" class="btn btn-block btn-lg btn-primary" role="button">Turn on</a></div></div>
{% endif %}
{% endfor %}
</body>
</html>
保存退出。運行
chmod 755 app.py
python app.py
會看到類似
[root@LoongsonPi pythoncode]# python app.py
* Serving Flask app "app" (lazy loading)
* Environment: production
WARNING: Do not use the development server in a production environment.
Use a production WSGI server instead.
* Debug mode: on
* Running on http://0.0.0.0:80/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger PIN: 135-748-612
192.168.1.126 - - [01/Oct/2018 06:10:56] "GET /55/off HTTP/1.1" 200 -
從局域網其它機器訪問龍芯派IP即可控制gpio的led
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发表于 2018-10-1 04:33:18
发表于 2018-10-1 21:41:56
楼主