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s.py
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s.py
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'''Serial communication test'''
import threading
import time
import serial
BAUD = 115200
PORT = '/dev/ttyUSB0'
ser = serial.Serial(port=PORT,
baudrate=BAUD,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
timeout=5)
line = ''
alive = True
endcommand = False
def readthread(ser):
'''read from seral port'''
global line
global endcommand
print('readthread init')
while alive:
try:
for c in ser.read():
line += (chr(c))
if line.startswith('['):
if line.endswith(']'):
print('receive data=' + line)
if line == '[end]':
endcommand = True
print('end command\n')
# line reset
line = ''
ser.write('ok'.encode())
else:
line = ''
except Exception as e:
print(f'read exception: {e}')
print('thread exit')
ser.close()
PLATFORM = 'DESKTOP2'
def main():
global endcommand
thread = threading.Thread(target=readthread, args=(ser, ))
thread.daemon = True
thread.start()
if PLATFORM == 'DESKTOP':
for count in range(0, 10):
strcmd = '[test' + str(count) + ']'
print('send data=' + strcmd)
strencoding = strcmd.encode()
ser.write(strencoding)
time.sleep(1)
strcmd = '[end]'
ser.write(strcmd.encode())
print('send data=' + strcmd)
else:
while True:
time.sleep(1)
if endcommand is True:
break
print('main exit')
alive = False
exit()
main()