Fixed Last Point error by adding a dummy Last Point = N+1 and then just deleting it after so we get our full range and don't have to fiddle sticks with the timing any more.

Impedance.c

@@ -20,6 +20,7 @@ AppIMPCfg_Type AppIMPCfg =
 
   .ImpODR = 20.0,             /* 20.0 Hz = 50ms period */
   .NumOfData = -1,
+  .RealDataCount = -1,        /* Default to no filtering */
   .SysClkFreq = 16000000.0,
   .WuptClkFreq = 32000.0,
   .AdcClkFreq = 16000000.0,
@@ -341,7 +342,10 @@ static AD5940Err AppIMPSeqMeasureGen(void)
   AD5940_SEQGenInsert(SEQ_WAIT(WaitClks/2));
   AD5940_SEQGenInsert(SEQ_WAIT(WaitClks/2));
   
-  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT|AFECTRL_WG, bFALSE); 
+  // Stop ADC/DFT first, wait 10us, then stop WG
+  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT, bFALSE); 
+  AD5940_SEQGenInsert(SEQ_WAIT(16*10)); 
+  AD5940_AFECtrlS(AFECTRL_WG, bFALSE);
 
   /* ----------------------------------------------------------------------- */
   /* Measurement 2: Sensor Current (I)                                       */
@@ -363,7 +367,10 @@ static AD5940Err AppIMPSeqMeasureGen(void)
   AD5940_SEQGenInsert(SEQ_WAIT(WaitClks/2));
   AD5940_SEQGenInsert(SEQ_WAIT(WaitClks/2));
 
-  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT|AFECTRL_WG, bFALSE); 
+  // Stop ADC/DFT first, wait 10us, then stop WG
+  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT, bFALSE); 
+  AD5940_SEQGenInsert(SEQ_WAIT(16*10)); 
+  AD5940_AFECtrlS(AFECTRL_WG, bFALSE);
 
   /* ----------------------------------------------------------------------- */
   /* Measurement 3: Sensor Voltage (V)                                       */
@@ -381,7 +388,11 @@ static AD5940Err AppIMPSeqMeasureGen(void)
   AD5940_SEQGenInsert(SEQ_WAIT(WaitClks/2));
   AD5940_SEQGenInsert(SEQ_WAIT(WaitClks/2));
 
-  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT|AFECTRL_WG|AFECTRL_ADCPWR, bFALSE); 
+  // Stop ADC/DFT first, wait 10us, then stop WG and ADC Power
+  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT, bFALSE); 
+  AD5940_SEQGenInsert(SEQ_WAIT(16*10)); 
+  AD5940_AFECtrlS(AFECTRL_WG|AFECTRL_ADCPWR, bFALSE); 
+
   AD5940_AFECtrlS(AFECTRL_HSTIAPWR|AFECTRL_INAMPPWR|AFECTRL_EXTBUFPWR|\
                 AFECTRL_WG|AFECTRL_DACREFPWR|AFECTRL_HSDACPWR|\
                 AFECTRL_SINC2NOTCH, bFALSE);
@@ -693,8 +704,20 @@ int32_t AppIMPISR(void *pBuff, uint32_t *pCount)
           
           AD5940_SleepKeyCtrlS(SLPKEY_UNLOCK); 
           AppIMPDataProcess((int32_t*)pBuff, &FifoCnt); 
+          
+          // DUMMY POINT FILTERING
+          // If we are in sweep mode and have exceeded the user's requested count,
+          // discard this data packet so the host doesn't see the artifact.
+          if (AppIMPCfg.SweepCfg.SweepEn && AppIMPCfg.RealDataCount > 0) {
+              if (AppIMPCfg.FifoDataCount > AppIMPCfg.RealDataCount) {
+                  *pCount = 0; // Discard
+              } else {
                   *pCount = FifoCnt;
               }
+          } else {
+              *pCount = FifoCnt;
+          }
+      }
       else
       {
           AD5940_SleepKeyCtrlS(SLPKEY_UNLOCK);

Impedance.h

@@ -21,6 +21,7 @@ typedef struct
 /* Application related parameters */ 
   float ImpODR;                 /*  */
   int32_t NumOfData;            /* By default it's '-1'. If you want the engine stops after get NumofData, then set the value here. Otherwise, set it to '-1' which means never stop. */
+  int32_t RealDataCount;        /* Actual number of valid points to report to host (used for dummy point filtering) */
   float WuptClkFreq;            /* The clock frequency of Wakeup Timer in Hz. Typically it's 32kHz. Leave it here in case we calibrate clock in software method */
   float SysClkFreq;             /* The real frequency of system clock */
   float AdcClkFreq;             /* The real frequency of ADC clock */

main.c

@@ -203,6 +203,7 @@ void Routine_Measure(float freq) {
     pCfg->SweepCfg.SweepEn = bFALSE;
     pCfg->SinFreq = freq;
     pCfg->NumOfData = -1; 
+    pCfg->RealDataCount = -1; // Disable filtering
     pCfg->bParaChanged = bTRUE; 
     
     if(AppIMPInit(AppBuff, APPBUFF_SIZE) == AD5940ERR_OK) {
@@ -222,9 +223,15 @@ void Routine_Sweep(float start, float end, int steps) {
     pCfg->SweepCfg.SweepEn = bTRUE;
     pCfg->SweepCfg.SweepStart = start;
     pCfg->SweepCfg.SweepStop = end;
-    pCfg->SweepCfg.SweepPoints = steps;
+    
+    // DUMMY POINT STRATEGY:
+    // Request steps + 1 from the engine, but tell the ISR to only report 'steps'.
+    // The artifact will happen on the +1 point, which is discarded.
+    pCfg->SweepCfg.SweepPoints = steps + 1;
+    pCfg->NumOfData = steps + 1; 
+    pCfg->RealDataCount = steps; // Stop reporting after this count
+    
     pCfg->SweepCfg.SweepLog = bTRUE;
-    pCfg->NumOfData = steps; 
     pCfg->bParaChanged = bTRUE; 
     
     if(AppIMPInit(AppBuff, APPBUFF_SIZE) == AD5940ERR_OK) {