6387994017
reached: it handles one test case correctly back and forth - Fixed oscillation code - Added a feature for switching off automatic updates in nxupdate Autoamtic updates cause problems when scanning...
70 lines
2.4 KiB
OpenEdge ABL
70 lines
2.4 KiB
OpenEdge ABL
\subsection{Motor Oscillation}
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This module allows to oscillate a motor, i.e. drive between two
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positions back and forth automatically. This is required for instance
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in order to control a radial collimator or in order to prevent
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preferred orientation effects in powder measurements. The oscialltion
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can be started and stoped through commands. When starting, this module
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takes over the motor in order to prevent it being driven by a
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user. The limits of the oscillation are given through the current
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software limits. When running, a special SICS task watches the motor
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and makes it run the other way when it has arrived at one of its
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boundaries. When oscillation is stopped, the motor is stopped, the
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task stopped and the control of the motor is returned to the user.
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In order to this, a data structure the following data structure is
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required:
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@d oscdat @{
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typedef struct {
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pObjectDescriptor pDes;
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pMotor pMot;
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float upperLimit;
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float lowerLimit;
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int nextTargetFlag;
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long taskID;
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int stopFlag;
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SConnection *pCon;
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int errorCount;
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int debug;
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} Oscillator, *pOscillator;
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@}
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The fields:
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\begin{description}
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\item[pDes] The SICS object descriptor.
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\item[pMot] The motor controlled through this module.
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\item[upperLimit] The uper limit of the oscillation.
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\item[lowerLimit] the lower limits of the oscillation.
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\item[nextTargetFlag] A flag which decides which limit is the next one
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to drive to.
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\item[taskID] The ID of the control task.
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\item[stopFlag] A flag to signal the control task to stop.
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\item[pCon] A dummy connection object to use for writing. Is
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configured to write to log files.
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\item[debug] A debug flag causing more messages to be printed.
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\end{description}
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The interface to this module is just the interpreter interface. The
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rest is module local.
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@o oscillate.h @{
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/*-----------------------------------------------------------------------
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Oscillator runs a motor back and forth between its software limits.
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copyright: see file COPYRIGHT
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Mark Koennecke, November 2004
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------------------------------------------------------------------------*/
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#ifndef SICSOSCILLATOR
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#define SICSOSCILLATOR
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#include "motor.h"
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@<oscdat@>
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/*---------------------------------------------------------------------*/
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int MakeOscillator(SConnection *pCon, SicsInterp *pSics, void *pData,
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int argc, char *argv[]);
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int OscillatorWrapper(SConnection *pCon, SicsInterp *pSics, void *pData,
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int argc, char *argv[]);
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#endif
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@}
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