no need to pass in scl & sda into screen constructor

docs/software/nrf52-TODO.md

@@ -0,0 +1,7 @@
+
+* make a new boarddef with a variant.h file.  Fix pins in that file.  In particular:
+#define PIN_SPI_MISO         (46)
+#define PIN_SPI_MOSI         (45)
+#define PIN_SPI_SCK          (47)
+#define PIN_WIRE_SDA         (26)
+#define PIN_WIRE_SCL         (27)

src/main.cpp

@@ -52,7 +52,7 @@ bool pmu_irq = false;
 meshtastic::Screen screen(SSD1306_ADDRESS, I2C_SDA, I2C_SCL);
 #else
 // Fake values for pins to keep build happy, we won't ever initialize it.
-meshtastic::Screen screen(SSD1306_ADDRESS, 0, 0);
+meshtastic::Screen screen(SSD1306_ADDRESS);
 #endif
 
 // Global power status singleton
@@ -248,8 +248,11 @@ void setup()
 
 #ifdef I2C_SDA
     Wire.begin(I2C_SDA, I2C_SCL);
-    scanI2Cdevice();
+#else
+    Wire.begin();
 #endif
+    scanI2Cdevice();
+
 
     // Buttons & LED
 #ifdef BUTTON_PIN

src/screen.h

@@ -89,7 +89,7 @@ class DebugInfo
 class Screen : public PeriodicTask
 {
   public:
-    Screen(uint8_t address, uint8_t sda, uint8_t scl);
+    Screen(uint8_t address, uint8_t sda = 0, uint8_t scl = 0);
 
     Screen(const Screen &) = delete;
     Screen &operator=(const Screen &) = delete;