Mercurial > pygpibtoolkit / file comparison
comparison: pygpib.py
pygpib.py
- changeset 40
- 1bbea188a7e5
- parent 39
- 8becd52c2171
- child 41
- 9a453b2479c5
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| 39:8becd52c2171 | 40:1bbea188a7e5 |
|---|---|
| 1 """ | |
| 2 gpib: create serial connection to GPIB-USB device (ProLogix is the | |
| 3 only supported device for now). | |
| 4 """ | |
| 5 import serial | |
| 6 from serial.serialutil import SerialException | |
| 7 import time | |
| 8 | |
| 9 class ConnectionError(Exception): | |
| 10 pass | |
| 11 | |
| 12 class Constants(object): | |
| 13 def __init__(self): | |
| 14 self.constants = {} | |
| 15 self.descriptions = {} | |
| 16 self.rev_constants = {} | |
| 17 for v, k, m in self._constants: | |
| 18 self.k = v | |
| 19 self.constants[v] = k | |
| 20 self.rev_constants[k] = v | |
| 21 self.descriptions[v] = m | |
| 22 | |
| 23 def __getitem__(self, k): | |
| 24 if isinstance(k, basestring): | |
| 25 return self.rev_constants[k] | |
| 26 else: | |
| 27 return self.constants[k] | |
| 28 | |
| 29 def get_description(self, k): | |
| 30 if isinstance(k, basestring): | |
| 31 k = self.rev_constants[k] | |
| 32 return self.descriptions[k] | |
| 33 | |
| 34 | |
| 35 class MODE(Constants): | |
| 36 _constants = [(1, "CONTROLLER", "Set device as Controller in Charge"), | |
| 37 (0, "DEVICE", "Set device as simple listener"), | |
| 38 ] | |
| 39 # TODO | |
| 40 # class STATUS_BYTE(Constants): | |
| 41 # # IEEE 488.2 Status Byte constants | |
| 42 # MAV = 0x10 # Message AVailable: bit 4 of the Status Byte | |
| 43 # ESB = 0x20 # Event Status Bit: bit 5 of the Status Byte | |
| 44 # MSS = 0x40 # Master Summary Status bit: bit 6 of the Status Byte (NOT | |
| 45 # # sent in response to a serial poll) | |
| 46 # RQS = 0x40 # Request Service: bit 6 of the Status Byte (when sent in | |
| 47 # # response to a serial poll) | |
| 48 # class SESR(Constants): | |
| 49 # # SESR constants (Standard Event Status Register) | |
| 50 # PON = 0x80 # Power On: Power has been turned On since last register | |
| 51 # # read access | |
| 52 # URQ = 0x40 # User Request: the user has activated some device control | |
| 53 # # (whatever the Remote Local state is) | |
| 54 # CME = 0x20 # Command Error | |
| 55 # EXE = 0x10 # Execution Error | |
| 56 # DDE = 0x08 # Device Dependant Error | |
| 57 # QYE = 0x04 # QuerY Error (attempt to read data while Output Queue is | |
| 58 # # empty, or data in the OQ was lost) | |
| 59 # RQC = 0x02 # Request Control: tell the CiC that the device wants to | |
| 60 # # become the CiC | |
| 61 # OPC = 0x01 # Operation Complete: device has completed any pending | |
| 62 # # operation (ready to accept new commands). This bit is | |
| 63 # # generated in response to a OPC command. | |
| 64 |
