reflow/Arduino_Monitor.py

79 lines
1.7 KiB
Python

"""
Listen to serial, return most recent numeric values
Lots of help from here:
http://stackoverflow.com/questions/1093598/pyserial-how-to-read-last-line-sent-from-serial-device
"""
from threading import Thread
import time
import serial
import struct
last_received = ''
profile = []
PI_TS_MIN = 0
PI_TS_MAX = 1
PI_TL = 2
PI_TP = 3
PI_TIME_MAX = 4
PI_RAMP_UP_MIN = 5
PI_RAMP_UP_MAX = 6
PI_RAMP_DOWN_MIN = 7
PI_RAMP_DOWN_MAX = 8
PI_TS_DURATION_MIN = 9
PI_TS_DURATION_MAX = 10
PI_TL_DURATION_MIN = 11
PI_TL_DURATION_MAX = 12
PI_TP_DURATION_MIN = 13
PI_TP_DURATION_MAX = 14
def receiving(ser):
global last_received
buffer = ''
ser.write(chr(255))
ser.flush()
profile = struct.unpack("hhhhhhhhhhhhhhh", ser.read(30))
ser.flushInput()
while 1:
ser.write(chr(254))
ser.flush()
last_received = ser.read(11)
print repr(last_received)
ser.flushInput()
class SerialData(object):
def __init__(self, init=50):
try:
self.ser = ser = serial.Serial(
port='/dev/ttyUSB0',
baudrate=9600, timeout=2)
except serial.serialutil.SerialException:
#no serial connection
self.ser = None
else:
Thread(target=receiving, args=(self.ser,)).start()
def next(self):
if not self.ser:
return 100 #return anything so we can test when Arduino isn't connected
try:
return int(struct.unpack("hhhhhb", last_received)[1])
except Exception, e:
print e
return 0
def __del__(self):
if self.ser:
self.ser.close()
if __name__=='__main__':
s = SerialData()
for i in range(500):
time.sleep(1)
print s.next()