Added timeout POC for LCD backlight (untested)

firmware/open_evse/J1772EvseController.cpp

@@ -276,14 +276,14 @@ void J1772EVSEController::chargingOn()
     Serial.print("relayHoldPwm: ");Serial.println(m_relayHoldPwm);
     // turn on charging pin to close relay
     digitalWrite(V6_CHARGING_PIN,HIGH);
-    digitalWrite(V6_CHARGING_PIN2,HIGH);
+    if (relay2Enable) {digitalWrite(V6_CHARGING_PIN2,HIGH); } 
     delay(m_relayCloseMs);
     // switch to PWM to hold closed
     analogWrite(V6_CHARGING_PIN,m_relayHoldPwm);
-    analogWrite(V6_CHARGING_PIN2,m_relayHoldPwm);
+    if (relay2Enable) {analogWrite(V6_CHARGING_PIN2,m_relayHoldPwm);}
 #else // !RELAY_PWM
     digitalWrite(V6_CHARGING_PIN,HIGH);
-    digitalWrite(V6_CHARGING_PIN2,HIGH);
+    if (relay2Enable) {digitalWrite(V6_CHARGING_PIN2,HIGH);}
 #endif // RELAY_PWM
   }
   else {
@@ -317,6 +317,8 @@ void J1772EVSEController::chargingOn()
 void J1772EVSEController::chargingOff()
 {
  // turn off charging current
+ //Note - we don't care if relay2 is enabled or not,
+ // in all cases we turn off both relays.
 #ifdef OEV6
   if (isV6()) {
 #ifdef RELAY_AUTO_PWM_PIN

firmware/open_evse/J1772EvseController.h

@@ -233,6 +233,7 @@ class J1772EVSEController {
 
 #ifdef OEV6
   uint8_t isV6() { return m_isV6; }
+  uint8_t relay2Enable = 1;   //default to both relays enabled
 #endif
 
 #ifdef ADVPWR
@@ -292,6 +293,7 @@ class J1772EVSEController {
   void Enable();
   void Disable(); // panic stop - open relays abruptly
   void Sleep(); // graceful stop - e.g. waiting for timer to fire- give the EV time to stop charging first
+  void Relay2Enable(uint8_t relay2on) { relay2Enable = relay2on; }
 
   uint16_t GetFlags() { return m_wFlags; }
   uint16_t GetVFlags() { return m_wVFlags; }

firmware/open_evse/main.cpp

@@ -197,6 +197,10 @@ TempMonitor g_TempMonitor;
 AutoCurrentCapacityController g_ACCController;
 #endif
 
+unsigned long OnboardDisplay::lastBacklightChangeMillis = 0;
+
+
+
 //-- end global variables
 
 // watchdog-safe delay - use this when delay is longer than watchdog
@@ -414,7 +418,6 @@ void OnboardDisplay::MakeChar(uint8_t n, PGM_P bytes)
 void OnboardDisplay::Init()
 {
   WDT_RESET();
-
 #ifdef RGBLCD
   m_bFlags = 0;
 #else
@@ -985,6 +988,11 @@ void OnboardDisplay::Update(int8_t updmode)
       }
     }
 #endif // DELAYTIMER
+
+  if ( g_OBD.lastBacklightChangeMillis < millis() + LCD_BL_TIMEOUT) {
+    //turn backlight off after 5 secs
+      LcdSetBacklightColor(0);
+  }
 #endif // LCD16X2
   }
 
@@ -2492,7 +2500,7 @@ uint8_t StateTransitionReqFunc(uint8_t curPilotState,uint8_t newPilotState,uint8
 void setup()
 {
   wdt_disable();
-  
+
   delay(400);  // give I2C devices time to be ready before running code that wants to initialize I2C devices.  Otherwise a hang can occur upon powerup.
 
   Serial.begin(SERIAL_BAUD);
@@ -2541,7 +2549,9 @@ void loop()
 #endif // PERIODIC_LCD_REFRESH_MS
 
   ProcessInputs();
-
+
+  //BackLightTimeout();
+
   // Delay Timer Handler - GoldServe
 #ifdef DELAYTIMER
   g_DelayTimer.CheckTime();

firmware/open_evse/open_evse.h

@@ -229,6 +229,7 @@ extern AutoCurrentCapacityController g_ACCController;
 //Adafruit RGBLCD (MCP23017) - can have RGB or monochrome backlight
 #define RGBLCD
 
+#define LCD_BL_TIMEOUT 5000
 //select default LCD backlight mode. can be overridden w/CLI/RAPI
 #define BKL_TYPE_MONO 0
 #define BKL_TYPE_RGB  1
@@ -844,6 +845,7 @@ typedef union union4b {
 #define OBD_UPD_HARDFAULT 2 // update w/ hard fault
 class OnboardDisplay
 {
+
 #ifdef RED_LED_REG
   DigitalPin pinRedLed;
 #endif
@@ -865,6 +867,9 @@ class OnboardDisplay
 
   void MakeChar(uint8_t n, PGM_P bytes);
 public:
+
+  static unsigned long lastBacklightChangeMillis ;
+
   OnboardDisplay();
   void Init();
 
@@ -937,6 +942,11 @@ class OnboardDisplay
 #endif // RGBLCD
   }
   void LcdSetBacklightColor(uint8_t c) {
+    static uint8_t lastColor = WHITE;
+    if (c != lastColor) {
+      lastBacklightChangeMillis = millis();
+      lastColor = c;
+    }
 #ifdef RGBLCD
     if (IsLcdBacklightMono()) {
       if (c) c = WHITE;

firmware/open_evse/rapi_proc.cpp

@@ -525,6 +525,20 @@ int EvseRapiProcessor::processCmd()
       }
       break;
 #endif // VOLTMETER
+
+#ifdef OEV6
+  case 'R':   //Relay2 enable
+    if (tokenCnt == 2) {
+      if ( (uint8_t)dtou32(tokens[1]) == 1 ) {
+        g_EvseController.Relay2Enable(1);
+      } else {
+        g_EvseController.Relay2Enable(0);
+      }
+    }
+    rc = 0;
+    break;
+#endif //OEV6
+
 #ifdef DELAYTIMER     
     case 'T': // timer
       if (tokenCnt == 5) {