Re-organize build system

Makefile

@@ -71,7 +71,7 @@ distclean:
 
 .PHONY:
 check: $(C_SRCS)
-	$(CHECK) $(CHECK_FLAGS) --check-config $(CC_SRCS)
+	$(CHECK) $(CHECK_FLAGS) $(CC_SRCS)
 
 $(TARGET): $(OBJS) $(THIS_MAKEFILE)
 	@mkdir -p $(dir $@)

src/platform/nrf52/gpio.cc

@@ -38,6 +38,11 @@ void Gpio::set_direction(direction dir)
     GPIO_REGS->PIN_CNF[pin_number] = direct | input | pull | drive | sense;
 }
 
+void Gpio::set_pin_number(uint32_t pin)
+{
+    this->pin_number = pin;
+}
+
 uint32_t Gpio::get()
 {
     uint32_t res = (GPIO_REGS->IN  >> pin_number) & 1UL;

src/platform/nrf52/gpio.h

@@ -10,6 +10,7 @@ class Gpio : public interfaces::GpioInterface
     public:
         inline Gpio() {}
         Gpio(uint32_t);
+        void set_pin_number(uint32_t);
         void set_direction(direction) override;
         uint32_t get() override;
         void set() override;