mbv: minor cleanup

mbv/apps/timer/timer.cc

@@ -1,25 +1,17 @@
 #include <cstdint>
 
+#include "bios.h"
+#include "gpio.h"
 #include "intc.h"
 #include "interrupts.h"
 #include "pol0.h"
 #include "timer.h"
 
-extern "C" {
-void BiosWozmon();
-}
-
 namespace {
 
-struct Gpio {
-    volatile uint32_t data;
-};
-
-Gpio* leds = reinterpret_cast<Gpio*>(GPIO0_BASE);
+Gpio* leds;
 Timer* timer;
 
-}
-
 void Timer0Isr() { 
     static int counter = 0;
     leds->data = counter++;
@@ -38,7 +30,10 @@ void SetupTimer() {
     EnableInterrupts();
 }
 
+}  // namespace
+
 int main() {
+    leds = Gpio::Instance(GPIO0_BASE);
     leds->data = 0xa0;
 
     SetupTimer();