module;
#include "CortexM4.h"
#include "system.h"
export module sys;

static volatile unsigned count = 0u;
extern "C" void SysTick_Handler () {
  if (count) count -= 1u;
}
namespace sys {
  export void delay (const unsigned ms = 500) {
    count = ms;
    while (count) {
      asm volatile ("wfi");
    }
  }
  export void init () {
    EnableDebugOnSleep();
    SysTick.Config (SystemCoreClock / 1000u);
  }
};