diff --git a/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/impedance_meter.h b/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/impedance_meter.h
index 3656959e0..7e93ea16d 100644
--- a/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/impedance_meter.h
+++ b/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/impedance_meter.h
@@ -560,84 +560,8 @@ static void SWVCurve(){
     }
     
 }
-/* 
-//working DPV curve
-static void DPVCurve(){
-
-    static uint8_t ramp0;
-    static uint8_t ramp1;
-    static uint16_t outputV;
-    static uint8_t counter;
-    static bool direction_up;
-    static bool current_direction_up;
-    float VoltValue;
-
-    // reset origin volt at the begin
-    if (DACreset){
-        outputV = VoltOrigin;
-        if (VoltFinal > VoltOrigin ) {
-            direction_up = true;
-            current_direction_up = true;
-        }
-        else {
-            direction_up = false;
-            current_direction_up = false;
-        }
-        ramp0 = (uint8_t) (VoltOrigin & 0x00FF); //right byte
-        ramp1 = (uint8_t) ((VoltOrigin>>8) & 0x00FF); //left byte
-        DACreset = false;
-        
-    }
-
-    // output a certain volt
-    DAC_outputV(outputV);
-
-    int32_t Vout = 0;
-    int16_t decode = (int16_t)(ramp1 << 8) | (uint16_t)(ramp0);
-    VoltValue = decode * (-2.9780379) + 5920.324416;
-    Vout = (int32_t) (VoltValue / 1);
-    // VoltValue = (ramp1*16 + ramp0/16) * 3.05;
-
-    if (direction_up) {
-        if (outputV >= VoltFinal) {
-                current_direction_up = false;  //problem occurs when origin == 0000 final == ffff!!!!!!
-        }
-        else if (outputV <= VoltOrigin) {
-            current_direction_up = true;
-            if (INSTRUCTION.CycleNumber == 0) {
-                PeriodicEvent = false;  //periodic event end
-                DACreset = true;
-                return;
-            }  
-            INSTRUCTION.CycleNumber--;
-        }
-    }
-    else {
-        if (outputV <= VoltFinal) {
-                current_direction_up = true;  //problem occurs when origin == 0000 final == ffff!!!!!!
-        }
-        else if (outputV >= VoltOrigin) {
-            current_direction_up = false;
-            if (INSTRUCTION.CycleNumber == 0) {
-                PeriodicEvent = false;  //periodic event end
-                DACreset = true;
-                return;
-            }  
-            INSTRUCTION.CycleNumber--;
-        }
-
-    }
-    
-
-
-    if(current_direction_up) outputV = outputV + Amplitude;
-    else outputV = outputV - Amplitude;
-
-    
-    
-}
-*/
 
+/*
 static void DPVCurve(){
     static uint8_t counter;
     static uint16_t Volt1;
@@ -698,6 +622,63 @@ static void DPVCurve(){
         else Volt2 = Volt2 - Step;
     }
 
+}
+*/
+static void DPVCurve(){
+    static uint8_t counter;
+    static uint16_t Volt1;
+    static uint16_t Volt2;
+    static uint16_t outputV;
+    static bool direction_up;
+    float VoltValue;
+
+    // reset origin volt at the begin
+    if (DACreset){
+        
+        if ( VoltOrigin < VoltFinal ) direction_up = true;
+        else direction_up = false;
+
+        Volt1 = VoltOrigin;
+        if (direction_up) Volt2 = VoltOrigin + Amplitude;
+        else Volt2 = VoltOrigin - Amplitude;
+
+        counter = 1;
+        DACreset = false;
+    }
+
+    if(counter == PulsePeriod) counter = 1;
+    else counter ++;
+
+    // output a certain volt
+    if( counter <= (PulsePeriod - PulseWidth)) outputV = Volt1;
+    else outputV = Volt2;
+
+    DAC_outputV(Volt1);
+    
+    // record the output voltage
+    int32_t Vout = 0;
+    int16_t decode = outputV; 
+    VoltValue = decode * (-2.9780379) + 5920.324416;
+    Vout = (int32_t) (VoltValue / 1);
+    // VoltValue = (ramp1*16 + ramp0/16) * 3.05;
+
+
+    // check if we reach the final volt
+    /* 
+    if ( (( outputV >= VoltFinal) && direction_up ) || (( outputV <= VoltFinal) && !direction_up)) {
+        PeriodicEvent = false;
+        DACreset = true;
+        return;
+    }*/
+
+    //check overflow/underflow and prepare for next output
+    if (direction_up) {
+        Volt1 = Volt1 + Amplitude;
+    }
+    else {
+        Volt1 = Volt1 - Amplitude;
+    }
+
     
 }