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firmware/open_evse/Gfi.cpp

@@ -45,6 +45,17 @@ void Gfi::Init(uint8_t v6)
 #endif // OEV6
   pinTest.init(reg,idx,DigitalPin::OUT);
 #endif
+#ifdef DC_GFCI_TEST
+  //volatile uint8_t *dcreg = DC_TEST_REG;
+  //volatile uint8_t dcidx  = DCTEST_IDX;
+#ifdef OEV6
+  if (v6) {
+    pinMode(V6_DC_TEST_PIN,OUTPUT);
+  }
+#else
+  //pinDCTest.init(reg,idx,DigitalPin::OUT);
+#endif // OEV6
+#endif //DC_GFCI_TEST
 
   Reset();
 }
@@ -94,6 +105,33 @@ uint8_t Gfi::SelfTest()
   }
   if (i == 40) return 3;
 
+#ifdef DC_GFCI_TEST
+  if (testSuccess) {  //no point continuing unless AC test was successful
+    testSuccess = 0;
+    // turn on DC test pin
+#ifdef V6_DC_TEST_PIN
+    digitalWrite(V6_DC_TEST_PIN,HIGH);
+#endif
+    for(int i=0; !testSuccess && (i < GFI_TEST_CYCLES); i++) {
+      //just wait this time...
+      delayMicroseconds(GFI_PULSE_ON_US);
+      delayMicroseconds(GFI_PULSE_OFF_US);
+    }
+    //turn off the DC test pin
+#ifdef V6_DC_TEST_PIN
+    digitalWrite(V6_DC_TEST_PIN,LOW);
+#endif 
+    // wait for GFI pin to clear
+    for (i=0;i < 40;i++) {
+      WDT_RESET();
+      if (!pin.read()) break;
+      delay(50);
+    }
+    if (i == 40) return 4;
+  }
+  //if testSuccess == 1 at this point then both tests were successful
+#endif //DC_GFCI_TEST
+
 #ifndef OPENEVSE_2
   // sometimes getting spurious GFI faults when testing just before closing
   // relay.

firmware/open_evse/J1772EvseController.cpp

@@ -275,15 +275,27 @@ void J1772EVSEController::chargingOn()
     Serial.print("\nrelayCloseMs: ");Serial.println(m_relayCloseMs);
     Serial.print("relayHoldPwm: ");Serial.println(m_relayHoldPwm);
     // turn on charging pin to close relay
+#ifdef V6_CHARGING_PIN
     digitalWrite(V6_CHARGING_PIN,HIGH);
+#endif    
+#ifdef V6_CHARGING_PIN2
     digitalWrite(V6_CHARGING_PIN2,HIGH);
+#endif
     delay(m_relayCloseMs);
     // switch to PWM to hold closed
+#ifdef V6_CHARGING_PIN
     analogWrite(V6_CHARGING_PIN,m_relayHoldPwm);
+#endif
+#ifdef V6_CHARGING_PIN2
     analogWrite(V6_CHARGING_PIN2,m_relayHoldPwm);
+#endif
 #else // !RELAY_PWM
+#ifdef V6_CHARGING_PIN
     digitalWrite(V6_CHARGING_PIN,HIGH);
+#endif
+#ifdef V6_CHARGING_PIN2
     digitalWrite(V6_CHARGING_PIN2,HIGH);
+#endif
 #endif // RELAY_PWM
   }
   else {
@@ -323,8 +335,12 @@ void J1772EVSEController::chargingOff()
 #ifdef RELAY_AUTO_PWM_PIN
   digitalWrite(RELAY_AUTO_PWM_PIN,LOW);
 #else // !RELAY_AUTO_PWM_PIN
+#ifdef V6_CHARGING_PIN
     digitalWrite(V6_CHARGING_PIN,LOW);
+#endif
+#ifdef V6_CHARGING_PIN2
     digitalWrite(V6_CHARGING_PIN2,LOW);
+#endif
 #endif // RELAY_AUTO_PWM_PIN
   }
   else {
@@ -967,8 +983,12 @@ void J1772EVSEController::Init()
 
 #ifdef OEV6
   if (isV6()) {
+#ifdef V6_CHARGING_PIN
     pinMode(V6_CHARGING_PIN,OUTPUT);
+#endif
+#ifdef V6_CHARGING_PIN2
     pinMode(V6_CHARGING_PIN2,OUTPUT);
+#endif
   }
   else { // !V6
 #endif // OEV6

firmware/open_evse/open_evse.h

@@ -175,6 +175,9 @@ extern AutoCurrentCapacityController g_ACCController;
 // If you loop a wire from the third GFI pin through the CT a few times and then to ground,
 // enable this. ADVPWR must also be defined.
 #define GFI_SELFTEST
+// If you loop a single turn of wire from the 12V supply through a 2k resistor to the
+// second DC relay pin, enable this for DC fault test
+//#define DC_GFCI_TEST
 
 // behavior specified by UL
 // 1) if enabled, POST failure will cause a hard fault until power cycled.
@@ -487,15 +490,23 @@ extern AutoCurrentCapacityController g_ACCController;
 #define ACLINE2_REG &PIND
 #define ACLINE2_IDX 4
 
-#define V6_CHARGING_PIN  5
-#define V6_CHARGING_PIN2 6
-
 // digital Relay trigger pin
+#define V6_CHARGING_PIN  5
 #define CHARGING_REG &PINB
 #define CHARGING_IDX 0
+
+#ifdef DC_GFCI_TEST
+// 6ma DC leakage test when this pin is high
+#define V6_DC_TEST_PIN 6
+#define DC_TEST_REG &PIND
+#define DC_TEST_IDX 7
+#else
 // digital Relay trigger pin for second relay
+#define V6_CHARGING_PIN2 6
 #define CHARGING2_REG &PIND
 #define CHARGING2_IDX 7
+#endif //DC_GFCI_TEST
+
 //digital Charging pin for AC relay
 #define CHARGINGAC_REG &PINB
 #define CHARGINGAC_IDX 1