7 files changed, 12 insertions, 10 deletions
diff --git a/Makefile b/Makefile
index 38b4e72..aa38b02 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 .PHONY: love flash
 love: sublab77.ihex
 
-CFLAGS=-Wall -Wextra -pedantic -std=c99 -Os -DF_CPU=1000000 -mmcu=attiny26
+CFLAGS=-Wall -Wextra -pedantic -std=c99 -DF_CPU=1000000UL -Os -fshort-enums -fno-move-loop-invariants -fno-tree-loop-optimize -mmcu=attiny26
 
 %.o: %.c
 	avr-gcc $(CFLAGS) -c -o $@ $<
@@ -16,4 +16,7 @@ sublab77.elf: clock.o dcf77.o lcd.o main.o timebase.o
 endif
 
 sublab77.ihex: sublab77.elf
-	objcopy -Oihex $^ $@
+	avr-objcopy -Oihex $^ $@
+
+clean:
+	rm *.o *.elf *.ihex
diff --git a/main.c b/main.c
index c5e4bd2..eec2401 100644
--- a/main.c
+++ b/main.c
@@ -186,7 +186,7 @@ static void perform(void)
 
 extern void __vectors(void) __attribute__((noreturn));
 __attribute__ ((noreturn))
-SIGNAL (ANA_COMP_vect)
+ISR (ANA_COMP_vect)
 {
 	PORTA = 0xff;
 
@@ -200,7 +200,8 @@ SIGNAL (ANA_COMP_vect)
 	__vectors();
 }
 
-int main( void )
+int __attribute__((OS_main))
+main( void )
 {
 
   PORTA = 0xFF;		// enable pull ups
diff --git a/main.h b/main.h
index 0fdba17..db5aeca 100644
--- a/main.h
+++ b/main.h
@@ -2,8 +2,6 @@
 #include <avr/interrupt.h>
 #include "types.h"
 
-#define XTAL 1000000L
-
 
 // Hardware Definitions
 
diff --git a/master_clock_addon.sch b/master_clock_addon.sch
new file mode 100644
index 0000000..b8f1f3a
--- /dev/null
+++ b/master_clock_addon.sch
diff --git a/master_clock_tn26.brd b/master_clock_tn26.brd
new file mode 100644
index 0000000..4381f1e
--- /dev/null
+++ b/master_clock_tn26.brd
diff --git a/master_clock_tn26.sch b/master_clock_tn26.sch
new file mode 100644
index 0000000..a992b7b
--- /dev/null
+++ b/master_clock_tn26.sch
diff --git a/timebase.c b/timebase.c
index ea8f8b9..07a5fe7 100644
--- a/timebase.c
+++ b/timebase.c
@@ -2,10 +2,10 @@
 #include "timebase.h"
 
 							      // at 12MHz:
-#define T0COUNT     (XTAL / 1024 / 64)	                         // 183
-#define T0SECERR    (XTAL - 1024L * 64 * T0COUNT)	         // 6912
+#define T0COUNT     (F_CPU / 1024 / 64)	                         // 183
+#define T0SECERR    (F_CPU - 1024L * 64 * T0COUNT)	         // 6912
 #define T0COUNTSEC  (T0COUNT + T0SECERR / 1024)	                 // 189
-#define T0MINERR    (XTAL - 1024 * (63 * T0COUNT + T0COUNTSEC))  // 768
+#define T0MINERR    (F_CPU - 1024 * (63 * T0COUNT + T0COUNTSEC))  // 768
 #define T0COUNTMIN  (T0COUNTSEC + (T0MINERR * 60 + 512) / 1024)  // 234
 
 // 234 = 12000000 Hz
@@ -26,7 +26,7 @@ void timebase_init( void )
 
 extern uint8_t waitctr;
 
-SIGNAL (TIMER0_OVF0_vect)
+ISR (TIMER0_OVF0_vect)
 {
   static u8 dcf77_time, old_dcf77;
 					// DCF77 receive