Mercurial > pygpibtoolkit / file comparison
comparison: gpib.py
gpib.py
- changeset 7
- 2e2742648546
- parent 2
- cd9efa64f6da
- child 9
- 3b50c46fca56
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| 6:6b6dc68588b2 | 7:2e2742648546 |
|---|---|
| 8 | 8 |
| 9 class ConnectionError(Exception): | 9 class ConnectionError(Exception): |
| 10 pass | 10 pass |
| 11 | 11 |
| 12 class GPIB(object): | 12 class GPIB(object): |
| 13 _retries = 10 | 13 _retries = 15 |
| 14 def __init__(self, device="/dev/ttyUSB0", baudrate=115200, timeout=0.1, | 14 def __init__(self, device="/dev/ttyUSB0", baudrate=115200, timeout=0.1, |
| 15 address=0, mode=1): | 15 address=0, mode=1): |
| 16 self._cnx = serial.Serial(port=device, baudrate=baudrate, timeout=timeout) | 16 self._cnx = serial.Serial(port=device, baudrate=baudrate, timeout=timeout) |
| 17 self._timeout = timeout | 17 self._timeout = timeout |
| 18 | 18 |
| 19 self.set_mode(mode) | 19 self.set_mode(mode) |
| 20 if mode == 1: | 20 self.set_address(address) |
| 21 self.set_address(address) | |
| 22 | 21 |
| 23 def _set_cmd(self, cmd, value): | 22 def _set_cmd(self, cmd, value): |
| 24 self._cnx.write('++%s %d\r'%(cmd, value)) | 23 self._cnx.write('++%s %d\r'%(cmd, value)) |
| 25 rval = self._read() | 24 self._cnx.write('++%s\r'%(cmd)) |
| 25 rval = self._read().strip() | |
| 26 if not rval.isdigit() or int(rval) != value: | 26 if not rval.isdigit() or int(rval) != value: |
| 27 raise ConnectionError("Can't set GPIB %s to %s"%(cmd, value)) | 27 raise ConnectionError("Can't set GPIB %s to %s [ret=%s]"%(cmd, value, repr(rval))) |
| 28 | 28 |
| 29 def set_address(self, address): | 29 def set_address(self, address): |
| 30 self._set_cmd('addr', address) | 30 self._set_cmd('addr', address) |
| 31 self._adress = address | 31 self._adress = address |
| 32 | 32 |
| 33 def set_mode(self, mode): | 33 def set_mode(self, mode): |
| 34 self._set_cmd('mode', mode) | 34 self._set_cmd('mode', mode) |
| 35 self._mode = mode | 35 self._mode = mode |
| 36 | 36 |
| 37 def _read(self): | 37 def _read(self): |
| 38 for i in range(self._retries): | 38 for i in range(self._retries): |
| 39 rdata = self._cnx.readline() | 39 rdata = self._cnx.readline() |
| 40 if rdata.strip() != "": | 40 if rdata.strip() != "": |
| 41 break | 41 break |
| 42 time.sleep(self._timeout) | 42 time.sleep(self._timeout) |
| 43 return rdata | 43 return rdata |
