#!/usr/bin/env python

import hid
import time

class VFDisplay (object):
   def __init__ (self, force_sync = 0, vid = 0x19c2, pid = 0x6a11):
      ret = hid.hid_init ()
      if ret != hid.HID_RET_SUCCESS:
         print "Initializing HID failed:", ret

      self.hid = hid.hid_new_HIDInterface ()
      self.cmds = []
      self.force_sync = force_sync
      matcher = hid.HIDInterfaceMatcher ()
      matcher.vendor_id  = vid
      matcher.product_id = pid

      ret = hid.hid_force_open (self.hid, 0, matcher, 3)
      if ret != hid.HID_RET_SUCCESS:
         print "Opening VFD device failed:", ret


   def sync (self):
      while len (self.cmds) > 0:
         cmdstr = ""
         while len (self.cmds) > 0 and len (cmdstr) + len (self.cmds[0]) <= 63:
            cmdstr += self.cmds[0]
            self.cmds = self.cmds[1:]
         cmdstr = chr (len(cmdstr)) + cmdstr
         hid.hid_set_output_report (self.hid, [0xff7f0004], cmdstr)


   def send_async (self, cmd):
      assert (len (cmd) < 62)
      self.cmds.append ("\x1b%s" % cmd)
      if self.force_sync:
         self.sync ()


   def send (self, cmd):
      self.send_async (cmd)
      self.sync ()


   def set_dimming (self, level = 1):
      assert 0 <= level <= 2
      self.send_async ("\x40%c" % level)


   def set_symbol (self, symbol_id, intensity = 1):
      assert 0 <= symbol_id <= 0x18
      assert symbol_id >= 0x0a or 0 <= intensity <= 1
      self.send_async ("\x30%c%c" % (symbol_id, intensity))


   def sync_time (self):
      t = time.localtime()
      m = (t.tm_min / 10) * 16 + (t.tm_min % 10)
      h = (t.tm_hour / 10) * 16 + (t.tm_hour % 10)
      self.send_async ("\x00%c%c" % (m, h))
      self.sync ()



if __name__ == '__main__':
   vfd = VFDisplay ()

   vfd.send ("\xf0")
   vfd.send ("\x00\x00\x00")
   vfd.set_dimming (2)
   vfd.set_symbol (7, 1)
   vfd.set_symbol (9, 1)

  #vfd.set_symbol (10, 1)
  #vfd.set_symbol (11, 2)
  #vfd.set_symbol (12, 1)
  #vfd.set_symbol (13, 2)
  #vfd.set_symbol (14, 1)
  #vfd.set_symbol (15, 2)
   time.sleep (.5)
   vfd.send ("\xf1")
   time.sleep (.5)
   vfd.set_dimming (1)
   vfd.send ("\xf0")
   time.sleep (.5)
   vfd.send ("\xf1")
   time.sleep (.5)
   vfd.set_dimming (2)
   vfd.send ("\xf0")
   time.sleep (.5)
   vfd.send ("\xf1")
   time.sleep (.5)
   vfd.set_dimming (1)
   vfd.send ("\xf0")
   time.sleep (.5)
   vfd.set_dimming (1)
   vfd.send ("\x50")
   vfd.sync_time ()
   vfd.send ("\x01\x01")
   vfd.sync ()
   time.sleep (.5)