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import serial
import os
import logging
from time import localtime, strftime, sleep
logging.basicConfig(filename="sbhserr.log",
format='%(asctime)s --- %(message)s'
)
logger=logging.getLogger()
logger.setLevel(logging.DEBUG)
class SbhsServer(object):
""" This is the Single Board Heater System class """
def get_usb_devices(self):
usb_ids = []
for tty in os.listdir('/dev'):
if tty.startswith('ttyUSB'):
try:
usb_ids.append(int(tty[6:]))
except ValueError:
logger.error("Could not get {0}".format(tty))
return usb_ids
def map_sbhs_to_usb(self, usb_devices):
sbhs_map = []
if usb_devices:
for usb_id in usb_devices:
sbhs = Sbhs(dev_id=usb_id)
status = sbhs.connect_device()
if status:
board = sbhs.get_machine_id()
logger.info("USB {0} is connected to SBHS machine id {1}"
.format(usb_id, board)
)
sbhs_map.append({"usb_id": usb_id, "sbhs_mac_id": board})
return sbhs_map
class Sbhs(object):
def __init__(self, dev_id):
self.outgoing_machine_id = 252
self.incoming_fan = 253
self.incoming_heat = 254
self.outgoing_temp = 255
self.max_heat = 100
self.max_fan = 100
self.dev_id = dev_id
def connect_device(self):
"""
Open a serial connection via USB to the SBHS using USB Device Number
"""
# check for valid device number
usb_device_file = '/dev/ttyUSB{}'.format(self.dev_id)
try:
self.boardcon = serial.Serial(port=usb_device_file,
baudrate=9600, bytesize=8,
parity='N', stopbits=1,
timeout=2
)
# org stopbits = 1
status = True
except Exception as e:
status = False
logger.error("Serial connection with {0} failed"
.format(usb_device_file)
)
return status
def get_machine_id(self):
""" Gets machine id from the device """
try:
self.boardcon.flushInput()
self._write(chr(self.outgoing_machine_id))
sleep(0.5)
machine_id = ord(self._read(1))
self.machine_id = machine_id
except Exception as e:
machine_id = -1
return int(machine_id)
def set_machine_heat(self, val):
""" Sets the heat, checks if value is valid i.e. within range.
Input: self object, val
Output: Error message if heat cannot be set.
"""
if val > self.max_heat or val < 0:
logger.error("Machine ID {0} tried setting heat {1}%".format())
return False
try:
self._write(chr(self.incoming_heat))
sleep(0.5)
self._write(chr(val))
return True
except:
print("Error: cannot set heat for machine \
id {}".format(self.machine_id))
self.log('cannot set heat for machine id \
%d' % self.machine_id, 'ERROR')
return False
def set_machine_fan(self, val):
""" Sets the fan speed, checks if value is valid i.e. within range.
Input: self object, val
Output: Error message if fan cannot be set.
"""
if val > self.max_fan or val < 0:
return False
try:
self._write(chr(self.incoming_fan))
sleep(0.5)
self._write(chr(val))
return True
except:
return True
def get_machine_temp(self):
""" Gets the temperature from the machine.
"""
try:
self.boardcon.flushInput()
self._write(chr(self.outgoing_temp))
temp = ord(self._read(1)) + (0.1 * ord(self._read(1)))
return temp
except:
print("Error: cannot read temperature from machine id \
{}".format(self.machine_id))
self.log('cannot read temperature from machine id %d' \
% self.machine_id, 'ERROR')
return 0.0
def disconnect(self):
""" Reset the board fan and heat values and close the USB connection """
try:
self.boardcon.close()
self.boardcon = False
self.status = 0
return True
except:
print('Error: cannot close connection to the machine')
self.log('cannot close connection to the machine', 'ERROR')
return False
def reset_board(self):
return self.set_machine_heat(0) and self.set_machine_fan(100)
def _read(self, size):
try:
data = self.boardcon.read(size)
return data
except Exception as e:
raise
def _write(self, data):
try:
self.boardcon.write(data)
return True
except Exception as e:
raise
def log(self, msg, level):
try:
errfile = open(LOG_FILE, 'a') # open error log file in append mode
if not errfile:
return
log_msg = '%s %s %s\n' %(level, strftime('%d:%m:%Y %H:%M:%S', \
localtime()), msg)
errfile.write(log_msg)
errfile.close()
return
except:
return
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