split code into more files

taenzer.h

@@ -0,0 +1,12 @@
+#ifndef _TAENZER_H_
+#define _TAENZER_H
+
+typedef struct {
+    uint8_t homed;
+    uint32_t pos;
+} taenzer_state_t;
+
+void do_taenzer(void);
+void timer4_init(void);
+
+#endif