Low-level packet driver to communicate to the kappaccd-controlling Windows PC.
It should not be necessary to talk at this level. See
the ccddrv module instead
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Functions
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CCDPC
recvfixed
sendfixed
timeouthandler
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CCDPC
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CCDPC (
hostname,
txtout=None,
idletask=None,
)
Factory function for a CCD connection.
Returns an instance of the appropriate class, depending
on the version of the server software that is running. |
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recvfixed
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recvfixed (
sock,
length,
timeouttime=30000,
idletask=None,
)
Get a fixed length packet from a socket
parameters:
- sock
the socket
- length
the total length of the packet that is expected to arrive
optional parameters:
- timeouttime
time (seconds) the first frame is allowed to take.
(successive frames must arrive within
config.packettimeout seconds)
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Exceptions
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emptypacket("Invalid packet received after %d other packets, %d bytes" %( len( result ), already ) )
error( "Socket died on us." )
timeout( "Incomplete packet received" )
timeout( "select interrupted by timeout" )
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sendfixed
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sendfixed ( sock, data )
Send a packet securely over a socket connection
parameters:
- sock
the socket
- data
the data to be sent
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timeouthandler
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timeouthandler ( sig, frame )
Signal handler for timeout, turning it into an exception |
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Classes
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| CCDPC3 | A driver that uses a level 5 protocol connection. | | DebuggingCCDPC | Low level driver that gives debugging output to terminal. | | NewCCDPC | Low level connection to the PC controlling the KappaCCD machine. | | StandardCCDPC | Low level connection to the PC controlling the KappaCCD machine. | | emptypacket | Exception raised when the socket is unexpectedly closed by the server | | error | Exception raised for a generic problem encountered in the communications | | protocolerror | Exception raised when the server seems to be talking another version of the protocol | | timeout | Exception raised when a communications timeout occurs |
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