-extern inline void spi_enable() { bset((void*)&_io_ports[M6811_SPCR], M6811_SPE); }
-extern inline void spi_disable() { bclr((void*)&_io_ports[M6811_SPCR], M6811_SPE); }
+extern volatile u8 _switch_input;
+#define switch_input _switch_input
+extern volatile u8 _misc_input;
+#define misc_input _misc_input
+extern volatile u8 _home_sensors;
+#define home_sensors _home_sensors