No longer skip first line in gathering file, since XPS only puts out exact number of requested pulses now; the readback positions are now the positions at the start of each pixel, not the end

2010-02-18 22:20:28 +00:00
parent f987b09d4c
commit 2bc018d1e3
1 changed files with 8 additions and 3 deletions
@@ -1202,9 +1202,14 @@ static void readGathering(SS_ID ssId, struct UserVar *pVar)
        fgets (buffer, MAX_GATHERING_STRING, gatheringFile);
    }
    /* The next line is the motor positions at the start of the trajectory element
-     * where pulses began to be output.  Skip this line because this pulse just
-     * started the MCS counting, there are no data yet. */
-    fgets (buffer, MAX_GATHERING_STRING, gatheringFile);
+     * where pulses began to be output.  
+     * We used to skip this line because this pulse just
+     * started the MCS counting, there are no data yet. 
+     * But that required the XPS to output more than the requested number of 
+     * output pulses, which is undesireable.  The SIS3801 can be configured to
+     * start counting before receiving the first input pulse, which should
+     * now be done. */
+    /* fgets (buffer, MAX_GATHERING_STRING, gatheringFile); */
    
    for (i=0; i<pVar->npulses; i++) {
        for (j=0; j<pVar->numAxes; j++) {