SWRMeter/tools/meas.py

###############################################################################

import argparse
import threading
import time
import serial
import copy
import binascii

###############################################################################

parser = argparse.ArgumentParser(description='SWR meter helper tool.')
parser.add_argument("-d", "--device", type=str, help="The control device like /dev/ttyUSB0 or COM3.")
# start_freq
parser.add_argument("-s", "--start_freq", type=int, help="")
# end_freq
parser.add_argument("-e", "--end_freq", type=int, help="")
# intervall
parser.add_argument("-i", "--intervall", type=int, help="")
# step_freq
parser.add_argument("-p", "--step_freq", type=int, help="")
# drive_str
parser.add_argument("-a", "--drive_str", type=int, help="")
# start measurement
parser.add_argument("-m", "--start_meas", default=False, help="", action='store_true')
# output file (CSV)
parser.add_argument("-o", "--output_file", type=str, help="")
# show graphical results
parser.add_argument("-g", "--show_graph", default=False, help="", action='store_true')
# get config
parser.add_argument("-c", "--get_config", default=False, help="", action='store_true')

###############################################################################

MSG_SOD1 = 0x3c
MSG_SOD2 = 0x3e
MSG_EOD1 = 0x0d
MSG_EOD2 = 0x0a

MSG_TYPE_ANSWER_OK      = 0x01
MSG_TYPE_ANSWER_NOK     = 0x02
MSG_TYPE_MEAS_FREQ_INFO = 0x03
MSG_TYPE_MEAS_END_INFO  = 0x04
MSG_TYPE_CONFIG         = 0x05

MSG_TYPE_ANSWER_OK_DATA_TO_RECV      = 0
MSG_TYPE_ANSWER_NOK_DATA_TO_RECV     = 0
MSG_TYPE_MEAS_FREQ_INFO_DATA_TO_RECV = 8
MSG_TYPE_MEAS_END_INFO_DATA_TO_RECV  = 0
MSG_TYPE_CONFIG_DATA_TO_RECV         = 15

CC_CMD_SET_START_FREQ     = 0x01
CC_CMD_SET_END_FREQ       = 0x02
CC_CMD_SET_INTERVALL      = 0x03
CC_CMD_SET_DRIVE_STRENGTH = 0x04
CC_CMD_SET_FREQ_STEP      = 0x05
CC_CMD_START_MEASUREMENT  = 0x06
CC_CMD_GET_CONFIG         = 0x10

###############################################################################

TIMEOUT_CNT_MAX     = 50
MAIN_LOOP_DELAY_S   = 0.05
THREAD_LOOP_DELAY_S = 0.01

###############################################################################

MUX_MIN_VAL = 0
MUX_MAX_VAL = 7

###############################################################################

ser    = None
device = "/dev/ttyUSB0"

###############################################################################

CC_STATE_WAIT_SOD1 = 0x01
CC_STATE_WAIT_SOD2 = 0x02
CC_STATE_READ_DATA = 0x03
CC_STATE_WAIT_EOD1 = 0x04
CC_STATE_WAIT_EOD2 = 0x05
CC_STATE_GET_TYPE  = 0x06

cc_state = CC_STATE_WAIT_SOD1

cc_state_list = [ CC_STATE_WAIT_SOD1,
                  CC_STATE_WAIT_SOD2,
                  CC_STATE_READ_DATA,
                  CC_STATE_WAIT_EOD1,
                  CC_STATE_WAIT_EOD2 ]

cc_state_fn = {}

msg_type_list = [ MSG_TYPE_ANSWER_OK,
                  MSG_TYPE_ANSWER_NOK,
                  MSG_TYPE_MEAS_FREQ_INFO,
                  MSG_TYPE_CONFIG,
                  MSG_TYPE_MEAS_END_INFO, ]

msg_type_data_to_read = { MSG_TYPE_ANSWER_OK      : MSG_TYPE_ANSWER_OK_DATA_TO_RECV,
                          MSG_TYPE_ANSWER_NOK     : MSG_TYPE_ANSWER_NOK_DATA_TO_RECV,
                          MSG_TYPE_MEAS_FREQ_INFO : MSG_TYPE_MEAS_FREQ_INFO_DATA_TO_RECV,
                          MSG_TYPE_CONFIG         : MSG_TYPE_CONFIG_DATA_TO_RECV,
                          MSG_TYPE_MEAS_END_INFO  : MSG_TYPE_MEAS_END_INFO_DATA_TO_RECV, }

msg_type       = 0

cc_data_read   = 0
cc_data_buffer = []

# yes a separate counter to manage the order of the received messages
cc_message_cnt       = 0
cc_received_messages = []

###############################################################################

thread_obj     = None
thread_lock    = None
thread_started = False
thread_stop    = False

###############################################################################

def cc_init():

  global cc_state_fn
  global cc_state

  cc_state = CC_STATE_WAIT_SOD1

  cc_state_fn = { CC_STATE_WAIT_SOD1 : cc_state_fn_wait_for_sod1,
                  CC_STATE_WAIT_SOD2 : cc_state_fn_wait_for_sod2,
                  CC_STATE_WAIT_EOD1 : cc_state_fn_wait_for_eod1,
                  CC_STATE_WAIT_EOD2 : cc_state_fn_wait_for_eod2,
                  CC_STATE_GET_TYPE  : cc_state_fn_get_type,
                  CC_STATE_READ_DATA : cc_state_fn_read_data, }

########## function to call by the thread
def cc_dataReceiverThread():

  global ser
  global cc_state
  global cc_state_fn
  global thread_started
  global thread_stop

  thread_started = True

  while thread_stop == False:

    # 1. read byte from serial port into incoming
    incoming = []
    bytesToRead = ser.inWaiting()
    if bytesToRead > 0:
      #print bytesToRead # TODO
      incoming = list(ser.read(64))

      #print incoming # TODO

      # 2. process the received data
      for c in incoming:
        c = int(binascii.hexlify(c), 16)

        # call the cc_state specific function to process the currently received byte
        cc_state_fn[cc_state](c)

      if cc_state not in cc_state_list:
        cc_state = CC_STATE_WAIT_SOD1

    time.sleep(THREAD_LOOP_DELAY_S)

  thread_started = False

##########
def cc_startReceiverThread():

  global thread_obj
  global thread_lock
  global thread_stop

  if thread_started == False:
    thread_lock = threading.Lock()
    thread_obj = threading.Thread(target=cc_dataReceiverThread)
    thread_obj.start()
    thread_stop = False

##########
def cc_stopReceiverThread():

  global thread_obj
  global thread_started
  global thread_stop

  if thread_started == True:
    thread_stop = True
    thread_obj.join() # wait for the thread to finish

##### CC_STATE_WAIT_SOD1
def cc_state_fn_wait_for_sod1(c):

  global cc_data_read
  global msg_type
  global cc_data_buffer
  global cc_state

  cc_data_read   = 0
  msg_type       = 0
  cc_data_buffer = []

  if c == MSG_SOD1:
    cc_state = CC_STATE_WAIT_SOD2
  else:
    cc_state = CC_STATE_WAIT_SOD1

##### CC_STATE_WAIT_SOD2
def cc_state_fn_wait_for_sod2(c):

  global cc_state

  if c == MSG_SOD2:
    cc_state = CC_STATE_GET_TYPE
  else:
    cc_state = CC_STATE_WAIT_SOD1

##### CC_STATE_GET_TYPE
def cc_state_fn_get_type(c):

  global msg_type
  global cc_state

  if c in msg_type_list:
    msg_type = c

    if msg_type_data_to_read[msg_type] > 0:
      cc_state = CC_STATE_READ_DATA
    else:
      cc_state = CC_STATE_WAIT_EOD1
  else:
    cc_state = CC_STATE_WAIT_SOD1

##### CC_STATE_READ_DATA
def cc_state_fn_read_data(c):

  global cc_data_buffer
  global cc_data_read
  global cc_state

  if cc_data_read <= msg_type_data_to_read[msg_type] - 1:
    cc_data_buffer.append(c)
    cc_data_read = cc_data_read + 1

  if cc_data_read == msg_type_data_to_read[msg_type]:
    cc_state = CC_STATE_WAIT_EOD1

##### CC_STATE_WAIT_EOD1
def cc_state_fn_wait_for_eod1(c):

  global cc_state

  if c == MSG_EOD1:
    cc_state = CC_STATE_WAIT_EOD2
  else:
    cc_state = CC_STATE_WAIT_SOD1

##### CC_STATE_WAIT_EOD2
def cc_state_fn_wait_for_eod2(c):

  global thread_lock
  global cc_message_cnt
  global cc_state

  if c == MSG_EOD2:
    is_message_read = False
    thread_lock.acquire()
    cc_received_messages.append([ cc_message_cnt,
                                  msg_type,
                                  is_message_read,
                                  copy.deepcopy(cc_data_buffer) ])
    thread_lock.release()
    cc_message_cnt = cc_message_cnt + 1

    cc_state = CC_STATE_WAIT_SOD1

###############################################################################

#####
def openSerialDevice(d):

  global ser

  # Why 115200? Because the host defines the baudrate for the USB serial connection.
  try:
    ser = serial.Serial(d, 115200, timeout=0)
  except:
    print "ERROR: Can't open the serial device " + device
    exit(1)

  #time.sleep(2)

#####
def closeSerialDevice():

  global ser

  ser.close()

#####
def sendSerialData(data):

  global ser

  ser.write(bytearray([ MSG_SOD1, MSG_SOD2 ]))
  ser.write(bytearray(data))
  ser.write(bytearray([ MSG_EOD1, MSG_EOD2 ]))

  ser.flush()

###############################################################################

if __name__ == "__main__":

  cc_init()

  # parse the commandline arguments
  args = parser.parse_args()

  dataSend = 0
  timeout  = 0

  # 1. open serial device or abort
  if args.device != None:
    device = args.device

  openSerialDevice(device)

  # 2. start thread to poll cc_dataReceiverThread()
  cc_startReceiverThread()

  # 3. get and process the commandline arguments/parameter
  if args.get_config == True:
    print "Send: GET_CONFIG"
    sendSerialData([CC_CMD_GET_CONFIG])
    dataSend = dataSend + 1

  if args.start_freq != None:
    sendSerialData([CC_CMD_SET_START_FREQ,
                    (args.start_freq & 0xff000000) >> 24,
                    (args.start_freq & 0x00ff0000) >> 16,
                    (args.start_freq & 0x0000ff00) >>  8,
                    (args.start_freq & 0x000000ff)])
    dataSend = dataSend + 1

  if args.end_freq != None:
    sendSerialData([CC_CMD_SET_END_FREQ,
                    (args.end_freq & 0xff000000) >> 24,
                    (args.end_freq & 0x00ff0000) >> 16,
                    (args.end_freq & 0x0000ff00) >>  8,
                    (args.end_freq & 0x000000ff)])
    dataSend = dataSend + 1

  if args.step_freq != None:
    sendSerialData([CC_CMD_SET_FREQ_STEP,
                    (args.step_freq & 0xff000000) >> 24,
                    (args.step_freq & 0x00ff0000) >> 16,
                    (args.step_freq & 0x0000ff00) >>  8,
                    (args.step_freq & 0x000000ff)])
    dataSend = dataSend + 1

  if args.intervall != None:
    sendSerialData([CC_CMD_SET_INTERVALL,
                    (args.intervall & 0x0000ff00) >>  8,
                    (args.intervall & 0x000000ff)])
    dataSend = dataSend + 1

  if args.drive_str != None:
    sendSerialData([CC_CMD_SET_DRIVE_STRENGTH,
                    args.drive_str])
    dataSend = dataSend + 1

  if args.start_meas == True:
    sendSerialData([CC_CMD_START_MEASUREMENT])
    dataSend = dataSend + 1

  # 4. start main loop
  while dataSend > 0 and timeout < TIMEOUT_CNT_MAX:

    thread_lock.acquire()
    #ser.write("9") # TODO
    tmp_messages = copy.deepcopy(cc_received_messages)
    thread_lock.release()

    # 4.1 test for the response(s)
    for e in tmp_messages:
      if e[2] == False: # test for unread message

        # process it and set the data to read
        if e[1] == MSG_TYPE_ANSWER_OK:
          print "recv: OK"

        elif e[1] == MSG_TYPE_ANSWER_NOK:
          print "recv: NOT OK"

        elif e[1] == MSG_TYPE_MEAS_FREQ_INFO:
          print "recv: FREQ INFO"
          freq  = e[3][0] << 24
          freq += e[3][1] << 16
          freq += e[3][2] <<  8
          freq += e[3][3]
          a0    = e[3][4] << 8
          a0   += e[3][5]
          a1    = e[3][6] << 8
          a1   += e[3][7]

        elif e[1] == MSG_TYPE_CONFIG:
          print "recv: CONFIG"
          start_freq  = e[3][0] << 24
          start_freq += e[3][1] << 16
          start_freq += e[3][2] <<  8
          start_freq += e[3][3]
          end_freq  = e[3][4] << 24
          end_freq += e[3][5] << 16
          end_freq += e[3][6] <<  8
          end_freq += e[3][7]
          step_freq  = e[3][8]  << 24
          step_freq += e[3][9]  << 16
          step_freq += e[3][10] <<  8
          step_freq += e[3][11]
          intervall  = e[3][12] << 8
          intervall += e[3][13]
          drive_str = e[3][14]
          print "start_freq = " + str(start_freq)
          print "end_freq   = " + str(end_freq)
          print "step_freq  = " + str(step_freq)
          print "intervall  = " + str(intervall)
          print "drive_str  = " + str(drive_str)

        elif e[1] == MSG_TYPE_MEAS_END_INFO:
          print "recv: END INFO"

          if args.output_file != None:
            pass # TODO impl
          if args.show_graph == True:
            pass # TODO impl

        else:
          print "err: unknown type 0x%02x" % (e[1])
          break

        thread_lock.acquire()
        cc_received_messages[e[0]][2] = True
        thread_lock.release()

        timeout = 0 # reset the timeout

        # reduce the number of messages to receive
        dataSend = dataSend - 1

    # manage the timeout behaviour
    time.sleep(MAIN_LOOP_DELAY_S)
    timeout = timeout + 1

  if timeout >= TIMEOUT_CNT_MAX:
    print "Timeout happened"

  # 5. stop data processing thread
  cc_stopReceiverThread()

  # 6. close serial device
  closeSerialDevice()

  exit(0)