piptest.py

#!/usr/bin/python
# *****BatteryMonitor Getdata from battery cells getdata.py*****
# Copyright (C) 2017 Simon Richard Matthews
# Project loaction https://github.com/simat/BatteryMonitor
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import sys
import serial
import binascii
from re import match
from time import sleep
#commands={'QPIGS':110,'Q':74,'QFLAG':15,'QPIRI':102,'PE':7,'PD':7,'PBCV':7,  \
#          'PCVV':7,'PBFT':7,'PCVT':7}
#commands={}
def openpip(port):
  openport = serial.Serial(port,baudrate=2400,timeout=2.0)  # open serial port
  return openport

def sendcmd(command,port='/dev/ttyUSB1'):
  """send command/query to Pip4048, return reply"""

#  try:
#    x=match("[A-Z,a-z]*",command)
#    replylen=commands[x.group()]
#  except KeyError:
#    replylen=int(input("Enter Reply Length>"))

  try:
    cmd=command.encode('ascii','strict')
    crc=crccalc(cmd)
    cmd=cmd+crc.to_bytes(2, byteorder='big')+b'\r'
    openport=openpip(port)
    openport.reset_input_buffer()
    openport.write(cmd)
#    reply = openport.read(replylen)
    reply=openport.readline()
    print ('chars in buf {}'.format(openport.in_waiting))
    if  crccalc(reply[0:-3]) != int.from_bytes(reply[-3:-1],byteorder='big'):
      raise IOError("CRC error in Pip4048 return string")
  except IOError as err:
    print(err.args)
  finally:
    openport.close()

  print (len(reply),reply)
  print(binascii.hexlify(reply))
  if command=='QPIGS':
    print ('AC output V =',reply[12:17])
    print ('AC output VA =',reply[23:27])
    print ('AC output W =',reply[28:32])
    print ('Bus V =',reply[37:40])
    print ('Battery V =',reply[41:46])
    print ('Battery In I =',reply[47:50])
    print ('Heat sink T =',reply[51:54])
    print ('PV Input current for battery I =',reply[60:64])
    print ('PV Input V =',reply[65:70])
    print ('Battery V from SCC =',reply[71:76])
    print ('Battery Discharge I =',reply[77:82])
    print ('Status =',reply[83:91])

# (230.0 21.7 230.0 50.0 21.7 5000 4000 48.0 49.0 45.0 51.6 50.2 2 30 030 0 1 3 9 01 0 0 48.0 0 1 000\x19Q\r'

  elif command=='QPIRI':
    print ('Recharge V =',reply[43:47])
    print ('LVD =',reply[48:52])
    print ('Bulk V =',reply[53:57])
    print ('Float V =',reply[58:62])


def setparam(command,port):
  reply=sendcmd(command,port)
  print (reply)
  if reply[1:4]!=b'ACK':
    raise IOError('Bad Parameters')

def getcmd():
  """gets command from user"""
  command=str(input("Enter Command>"))
  return command

def loop():
  while True:
    main()

def main(port='/dev/ttyUSB1'):
    command=getcmd()
    sendcmd(command,port)

def crccalc(command):
  """returns crc as integer from binary string command"""

  crc=binascii.crc_hqx(command,0)
  crchi=crc>>8
  crclo=crc&255

  if crchi == 0x28 or crchi==0x0d or crchi==0x0a:
    crc+=256

  if crclo == 0x28 or crclo==0x0d or crclo==0x0a:
    crc+=1
  return crc

if __name__ == "__main__":
  """if run from command line, piptest [command] [port]
  default port /dev/ttyUSB1, if no command ask user"""

  print (sys.argv)
  if len(sys.argv) == 2:
    sendcmd(sys.argv[1])
  else:
    if len(sys.argv) == 3:
      sendcmd(sys.argv[1],sys.argv[2])
    else:
      loop()