#!/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 time
import serial
import binascii
from config import config
numcells = config['battery']['numcells']
class Raw:
# compile analog capture code to save CPU time
vin = []
for i in sorted(config['VoltageInputs']):
vin = vin + [compile(config['VoltageInputs'][i], '<string>', 'eval')]
# vin = vin + [config['VoltageInputs'][i]]
#for i in config['CurrentInputs']:
# config['CurrentInputs'][i] = compile(config['CurrentInputs'][i], '<string>', 'eval')
iin = []
for i in sorted(config['CurrentInputs']):
iin = iin + [compile(config['CurrentInputs'][i], '<string>', 'eval')]
line1 = [ 0 for i in range(20)]
rawi = [0.0, 0.0, 0.0]
rawv = [ 0.0 for i in range(numcells+1)]
ser = serial.Serial(config['files']['usbport']) # open serial port
ser.timeout = 3
def getbmsdat(self,port,command):
""" Issue BMS command and return data as byte data """
""" assumes data port is open and configured """
for i in range(5):
try:
port.write(command)
reply = port.read(4)
# raise serial.serialutil.SerialException('hithere')
break
except serial.serialutil.SerialException as err:
errfile=open(config['files']['errfile'],'at')
errfile.write(time.strftime("%Y%m%d%H%M%S ", time.localtime())+str(err.args)+'\n')
errfile.close()
# print (reply)
x = int.from_bytes(reply[3:5], byteorder = 'big')
# print (x)
data = port.read(x)
end = port.read(3)
# print (data)
return data
def x(self):
""" Get data from BMS board"""
command = bytes.fromhex('DD A5 03 00 FF FD 77')
dat = self.getbmsdat(self.ser,command)
self.rawi[0] = int.from_bytes(dat[2:4], byteorder = 'big',signed=True)
# print (self.rawi)
# self.line1 = [ 0 for i in range(int(len(dat)))]
# for i in range(0,int(len(dat))):
# print (dat[i*2:i*2+2])
# print (int.from_bytes(dat[i:i+1], byteorder = 'big'))
# self.line1[i] = int.from_bytes(dat[i:i+1], byteorder = 'big')
# print (binascii.hexlify(dat))
# print (self.line1)
# voltages
command = bytes.fromhex('DD A5 04 00 FF FC 77')
voltages = self.getbmsdat(self.ser,command)
for i in range(0,numcells):
self.rawv[i+1] = int.from_bytes(voltages[i*2:i*2+2], byteorder = 'big')\
/1000.00
self.rawv[i+1] = self.rawv[i+1]+self.rawv[i]
# print (self.rawv)
# print (binascii.hexlify(voltages))
