Fixed number of commands bug in turboPmacAxis::init

The correct scale from counts to engeering units is Qxx00.

.gitignore

@@ -0,0 +1,8 @@
+O.*
+.cvsignore
+.vscode
+src/.vscode
+utils/analyzeTcpDump/__pycache__
+utils/analyzeTcpDump/demo.pcap.json
+utils/analyzeTcpDump/demovenv
+utils/analyzeTcpDump/venv

src/turboPmacAxis.cpp

@@ -70,12 +70,13 @@ turboPmacAxis::turboPmacAxis(turboPmacController *pC, int axisNo,
         axes.push_back(this);
     }
 
-    pTurboPmacA_ = std::make_unique<turboPmacAxisImpl>(
-        (turboPmacAxisImpl){.waitForHandshake = false,
-                            .enableDisable = false,
-                            .timeAtHandshake = 0,
-                            .axisStatus = 0,
-                            .needInit = false});
+    pTurboPmacA_ = std::make_unique<turboPmacAxisImpl>((turboPmacAxisImpl){
+        .waitForHandshake = false,
+        .enableDisable = false,
+        .timeAtHandshake = 0,
+        .axisStatus = 0,
+        .needInit = false,
+    });
 
     // Provide initial values for some parameter library entries
     status = pC_->setIntegerParam(axisNo_, pC_->rereadEncoderPosition(), 0);
@@ -132,9 +133,16 @@ asynStatus turboPmacAxis::init() {
     double motorVelocity = 0.0;
     double motorVmax = 0.0;
     double motorAccel = 0.0;
-    int acoDelay = 0.0; // Offset time for the movement watchdog caused by
-                        // the air cushions in milliseconds.
-    int axStatus = 0;
+
+    // Conversion factor between engineering units (EU) and encoder counts
+    double counts_to_eu = 0.0;
+
+    // Deadband in counts. Can be a fraction of a count, hence double.
+    double deadband_counts = 0.0;
+
+    // Offset time for the movement watchdog caused by the air cushions in
+    // milliseconds.
+    int acoDelay = 0.0;
 
     // The parameter library takes some time to be initialized. Therefore we
     // wait until the status is not asynParamUndefined anymore.
@@ -163,12 +171,14 @@ asynStatus turboPmacAxis::init() {
 
     /*
     Read out the axis status, the current position, current and maximum speed,
-    acceleration and the air cushion delay.
+    acceleration, the air cushion delay, the scaling factor between counts and
+    engineering units ([Qxx00] = engineering units / counts) and the deadband
+    Ixx65.
     */
     snprintf(command, sizeof(command),
-             "P%2.2d00 Q%2.2d10 Q%2.2d03 Q%2.2d04 Q%2.2d06 P%2.2d22", axisNo_,
-             axisNo_, axisNo_, axisNo_, axisNo_, axisNo_);
-    status = pC_->writeRead(axisNo_, command, response, 6);
+             "Q%2.2d10 Q%2.2d03 Q%2.2d04 Q%2.2d06 P%2.2d22 Q%2.2d00 I%2.2d65",
+             axisNo_, axisNo_, axisNo_, axisNo_, axisNo_, axisNo_, axisNo_);
+    status = pC_->writeRead(axisNo_, command, response, 7);
     if (status != asynSuccess) {
         asynPrint(
             pC_->pasynUser(), ASYN_TRACE_ERROR,
@@ -180,8 +190,9 @@ asynStatus turboPmacAxis::init() {
             pC_->portName, axisNo(), __PRETTY_FUNCTION__, __LINE__);
         pTurboPmacA_->needInit = true;
     }
-    nvals = sscanf(response, "%d %lf %lf %lf %lf %d", &axStatus, &motorPos,
-                   &motorVmax, &motorVelocity, &motorAccel, &acoDelay);
+    nvals = sscanf(response, "%lf %lf %lf %lf %d %lf %lf", &motorPos,
+                   &motorVmax, &motorVelocity, &motorAccel, &acoDelay,
+                   &counts_to_eu, &deadband_counts);
 
     // The acoDelay is given in milliseconds -> Convert to seconds, rounded up
     setOffsetMovTimeout(std::ceil(acoDelay / 1000.0));
@@ -191,7 +202,7 @@ asynStatus turboPmacAxis::init() {
     // here to mm/s^2.
     motorAccel = motorAccel * 1000;
 
-    if (nvals != 6) {
+    if (nvals != 8) {
         return pC_->couldNotParseResponse(command, response, axisNo_,
                                           __PRETTY_FUNCTION__, __LINE__);
     }
@@ -215,6 +226,26 @@ asynStatus turboPmacAxis::init() {
         return status;
     }
 
+    /*
+    Check if the new target position is within the range current position +/-
+    deadband. If that is the case, no movement command should be sent. This
+    functionality is implemented within the motor record itself, we just need to
+    populate the field SPDP (see record PushSPDB2Field in db/turboPmac.db)
+
+    First, the deadband is read out (Ixx65, see Turbo PMAC User Manual, p.
+    160). This value then needs to be converted into counts (by dividing it by
+    16). After words, the deadband in counts then need to be converted into
+    engineering units. For this, the scaling factor Qxx10 needs to be applied
+    (see SINQ_2G_MCU_SW_manual_rev7, p. 17):
+    [Qxx10] = engineering units (eu) / counts
+    deadband_eu = Qxx10 * Ixx65 / 16
+
+    The values of Qxx10 and Ixx65 are read out during initialization and are
+    assumed to not change during operation.
+    */
+    setAxisParamChecked(this, motorPositionDeadband,
+                        counts_to_eu * deadband_counts / 16.0);
+
     // Update the parameter library immediately
     status = callParamCallbacks();
     if (status != asynSuccess) {
@@ -521,11 +552,6 @@ asynStatus turboPmacAxis::doPoll(bool *moving) {
 
     errorStatus = handleError(error, userMessage, sizeof(userMessage));
 
-    // Update the parameter library
-    if (error != 0) {
-        setAxisParamChecked(this, motorStatusProblem, true);
-    }
-
     if (*moving == false) {
         setAxisParamChecked(this, motorMoveToHome, false);
     }
@@ -752,7 +778,7 @@ asynStatus turboPmacAxis::doMove(double position, int relative,
 
     char command[pC_->MAXBUF_] = {0};
     char response[pC_->MAXBUF_] = {0};
-    double motorCoordinatesPosition = 0.0;
+    double motorTargetPosition = 0.0;
     double motorRecResolution = 0.0;
     double motorVelocity = 0.0;
     int enabled = 0;
@@ -773,13 +799,14 @@ asynStatus turboPmacAxis::doMove(double position, int relative,
     }
 
     // Convert from EPICS to user / motor units
-    motorCoordinatesPosition = position * motorRecResolution;
+    motorTargetPosition = position * motorRecResolution;
     motorVelocity = maxVelocity * motorRecResolution;
 
     asynPrint(pC_->pasynUser(), ASYN_TRACE_FLOW,
               "Controller \"%s\", axis %d  => %s, line %d\nStart of axis to "
               "position %lf.\n",
-              pC_->portName, axisNo_, __PRETTY_FUNCTION__, __LINE__, position);
+              pC_->portName, axisNo_, __PRETTY_FUNCTION__, __LINE__,
+              motorTargetPosition);
 
     // Check if the speed is allowed to be changed
     getAxisParamChecked(this, motorCanSetSpeed, &motorCanSetSpeed);
@@ -804,11 +831,11 @@ asynStatus turboPmacAxis::doMove(double position, int relative,
     if (relative) {
         snprintf(&command[writeOffset], sizeof(command) - writeOffset,
                  "P%2.2d23=0 Q%2.2d02=%lf M%2.2d=2", axisNo_, axisNo_,
-                 motorCoordinatesPosition, axisNo_);
+                 motorTargetPosition, axisNo_);
     } else {
         snprintf(&command[writeOffset], sizeof(command) - writeOffset,
                  "P%2.2d23=0 Q%2.2d01=%lf M%2.2d=1", axisNo_, axisNo_,
-                 motorCoordinatesPosition, axisNo_);
+                 motorTargetPosition, axisNo_);
     }
 
     // We don't expect an answer
@@ -820,7 +847,7 @@ asynStatus turboPmacAxis::doMove(double position, int relative,
             "Controller \"%s\", axis %d  => %s, line %d\nStarting movement to "
             "target position %lf failed.\n",
             pC_->portName, axisNo_, __PRETTY_FUNCTION__, __LINE__,
-            motorCoordinatesPosition);
+            motorTargetPosition);
         setAxisParamChecked(this, motorStatusProblem, true);
         return status;
     }

src/turboPmacAxis.h

@@ -13,6 +13,10 @@ class HIDDEN turboPmacAxis : public sinqAxis {
      *
      * @param pController         Pointer to the associated controller
      * @param axisNo              Index of the axis
+     * @param initialize          By setting this parameter to false, the
+     * initialization functions of the axes are not executed. This is e.g.
+     * necessary when this constructor is called from a children class
+     * constructor which performs its own initialization.
      */
     turboPmacAxis(turboPmacController *pController, int axisNo,
                   bool initialize = true);
@@ -24,6 +28,18 @@ class HIDDEN turboPmacAxis : public sinqAxis {
      */
     virtual ~turboPmacAxis();
 
+    /**
+     * @brief Readout of some values from the controller at IOC startup
+     *
+     * The following steps are performed:
+     * - Read out the motor status, motor position, velocity and acceleration
+     * from the MCU and store this information in the parameter library.
+     * - Set the enable PV according to the initial status of the axis.
+     *
+     * @return asynStatus
+     */
+    virtual asynStatus init();
+
     /**
      * @brief Implementation of the `stop` function from asynMotorAxis
      *
@@ -70,18 +86,6 @@ class HIDDEN turboPmacAxis : public sinqAxis {
                               double min_velocity, double max_velocity,
                               double acceleration);
 
-    /**
-     * @brief Readout of some values from the controller at IOC startup
-     *
-     * The following steps are performed:
-     * - Read out the motor status, motor position, velocity and acceleration
-     * from the MCU and store this information in the parameter library.
-     * - Set the enable PV according to the initial status of the axis.
-     *
-     * @return asynStatus
-     */
-    virtual asynStatus init();
-
     /**
      * @brief Implementation of the `doReset` function from sinqAxis.
      *

src/turboPmacController.cpp

@@ -47,7 +47,7 @@ struct turboPmacControllerImpl {
     int flushHardware;
     int limFromHardware;
 };
-#define NUM_turboPmac_DRIVER_PARAMS 3
+#define NUM_turboPmac_DRIVER_PARAMS 5
 
 turboPmacController::turboPmacController(const char *portName,
                                          const char *ipPortConfigName,