early_console.cpp

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#include <cpu_io.h>
#include <etl/singleton.h>
 
using SerialSingleton = etl::singleton<cpu_io::Serial>;
 
namespace {
 
cpu_io::Serial* serial = nullptr;
 
struct EarlyConsole {
  EarlyConsole() {
    SerialSingleton::create(cpu_io::kCom1);
    serial = &SerialSingleton::instance();
  }
};
 
EarlyConsole early_console;
 
}  // namespace
 
extern "C" auto etl_putchar(int c) -> void {
  if (serial) {
    serial->Write(c);
  }
}