arch: Add delay_ms function

include/arch.h

@@ -11,6 +11,7 @@ class Arch {
 		void idle_loop();
 		void idle();
 		void delay_us(unsigned char const us);
+		void delay_ms(unsigned char const ms);
 };
 
 extern Arch arch;

include/arch/arduino-nano-168

+arduino-nano
\ No newline at end of file

src/arch/arduino-nano/arch.cc

@@ -65,7 +65,12 @@ void Arch::idle(void)
 
 void Arch::delay_us(unsigned char const us)
 {
-	__builtin_avr_delay_cycles(1600);
+	_delay_us(us);
+}
+
+void Arch::delay_ms(unsigned char const ms)
+{
+	_delay_ms(ms);
 }
 
 Arch arch;