我想在pyserial中使用Flask从串口读取和写入数据。我想通过网页来做到这一点。代码如下所示。我在网页上写数据没有任何问题，但我无法读取数据，我在阅读过程中遇到运行时错误。我该如何实施解决方案？
我实际上是在尝试从串口读取数据的所有方法。但我不知道哪种方式适合我。对于我来说，从串口向连接到网页的用户显示数据的最佳方法是什么？
我收到了错误消息：
0
def serial runtime error
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 505, in run
self.__target(*self.__args, **self.__kwargs)
File "__init__.py", line 46, in serialRead
return jsonify(result='serial runtime error')
File "/usr/local/lib/python2.7/dist-packages/flask/json.py", line 251, in jsonify
if current_app.config['JSONIFY_PRETTYPRINT_REGULAR'] and not request.is_xhr:
File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 347, in __getattr__
return getattr(self._get_current_object(), name)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 306, in _get_current_object
return self.__local()
File "/usr/local/lib/python2.7/dist-packages/flask/globals.py", line 51, in _find_app
raise RuntimeError(_app_ctx_err_msg)
RuntimeError: Working outside of application context.
This typically means that you attempted to use functionality that needed
to interface with the current application object in a way. To solve
this set up an application context with app.app_context(). See the
documentation for more information.
python代码：
app = Flask(__name__)
app.secret_key = "asds"
@app.route('/run_write', methods=["GET","POST"])
def serialWrite():
print "click"
message="selam zafer"
if request.method == "POST":
attempted_writeData = request.form['writeData']
message=attempted_writeData
try:
if seri.isOpen():
print "Serial is open!"
seri.write(message)
session['serial_write'] = True
flash(message+" mesajiniz gonderildi..",'write')
return redirect(url_for("usart"))
except Exception as e:
session['serial_write'] = False
flash(message+" mesajiniz gonderilemedi...",'write')
return redirect(url_for("usart"))
def serialRead():
data =""
# seri = serial.Serial(port = "/dev/ttyO1", baudrate=9600) seri.close() seri.open()
while 1:
if seri.isOpen():
try:
# seri.write("hello")
data=seri.read()
print data
if data:
#flash(data,'read')
return jsonify(result=data)
except RuntimeError:
print 'def serial runtime error'
return jsonify(result='serial runtime error')
seri.close()
except KeyboardInterrupt:
print 'def serial klavye hatasi'
seri.close()
@app.route('/background_process')
def background_process():
try:
print 'background '
threadSerial = Thread(target=serialRead)
# threadSerial.daemon = True
threadSerial.start()
return jsonify(result='serial runtime error')
except Exception as e:
flash(e)
@app.route('/')
def homepage():
try:
return render_template("pages/Beagle.html")
except Exception as e:
flash(e)
@app.route('/usart/',methods=["GET","POST"])
def usart():
#return ("hi")
if not seri.isOpen():
flash("Seri baglanti kurulamadi",'connect')
session['serial_con'] = False
else:
flash("Seri baglati basarili",'connect')
session['serial_con'] = True
return render_template("pages/usart.html")
if __name__ == "__main__":
UART.setup("UART1")
seri = serial.Serial(port = "/dev/ttyO1", baudrate=9600)
seri.close()
seri.open()
try:
app.run(host='0.0.0.0', port=8082)
except SerialException as e:
pass
和网页代码
{% extends "pages/Beagle.html" %}
{% block body %}
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type=text/javascript>
$(function() {
$('a#process_input').bind('click', function() {
$.getJSON('/background_process', function(data) {
$("#result").text(data.result);
});
return false;
});
});
</script>
</head>
<body class="body">
<div id="page-wrapper">
<div class="row">
<div class="col-lg-12">
<h1 class="page-header">BeagleBone Communation</h1>
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
<div class="row">
<div class="col-lg-12">
<div class="panel panel-default">
<div class="panel-heading">
Usart Data
</div>
<div class="panel-body">
<div class="row">
<div class="col-lg-6">
<div class="panel panel-default">
<div class="panel-heading">
Read Data BeagleBone
</div>
<div class="panel-body">
<label>Send Data Input</label>
<form class="form-signin" action="/run_write" method="post" role="form">
<input name="writeData" class="form-control">
<p class="help-block">Writing Data via USART on BeagleBone.</p>
<button type="submit" class="btn btn-primary btn-lg btn-block">Send Button</button>
{% with messages= get_flashed_messages(category_filter=["write"]) %}
{% if messages %}
{% for message in messages %}
{% if session.serial_write %}
<div class="alert alert-success alert-dismissible pull-right" role="alert" style="position: relative;">
<button type="button" class="close" data-dismiss="alert" aria-label="close"<span aria-hidden="true">×</span></button>
{% else %}
<div class="alert alert-danger alert-dismissible pull-right" role="alert" style="position: relative;">
<button type="button" class="close" data-dismiss="alert" aria-label="close"<span aria-hidden="true">×</span></button>
{% endif %}
{{message}}
</div>
{%endfor%}
{% endif %}
{% endwith %}
</form>
</div>
<!-- <button type="reset" class="btn btn-default">Reset Button</button> -->
</div>
</div>
<!-- /.col-lg-6 (nested) -->
<div class="col-lg-6">
<div class="panel panel-default">
<div class="panel-heading">
Read Data BeagleBone
</div>
<div class="panel-body">
<!-- <h2>heading 2 -->
<!-- <small>sub-heading</small> -->
<!-- </h2> -->
<h3>Value read:
<form>
<small id= result name=proglang></small>
<a href='#' id=process_input> <button type="submit" class="btn btn-primary btn-lg btn-block">Start Read </button></a>
</form>
</h3>
</div>
<!-- /.panel-body -->
</div>
<!-- /.panel -->
</div>
</div>
<!-- /.col-lg-6 (nested) -->
</div>
<!-- /.row (nested) -->
</div>
<!-- /.panel-body -->
</div>
<!-- /.panel -->
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
</div>
<!-- /#page-wrapper -->
</body>
{% endblock %}
非常感谢