diff options
Diffstat (limited to 'Projects/AVRISP-MKII/Lib/Timeout.S')
-rw-r--r-- | Projects/AVRISP-MKII/Lib/Timeout.S | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Projects/AVRISP-MKII/Lib/Timeout.S b/Projects/AVRISP-MKII/Lib/Timeout.S new file mode 100644 index 000000000..ad56d1d21 --- /dev/null +++ b/Projects/AVRISP-MKII/Lib/Timeout.S @@ -0,0 +1,23 @@ +#include <avr/io.h>
+#include "V2Protocol.h"
+
+.global TIMER0_COMPA_vect
+TIMER0_COMPA_vect:
+ sei
+ push r24
+ in r24, 0x3f
+ push r24
+
+ in r24, TimeoutMSRemaining
+ and r24, r24
+ breq Epilogue
+ subi r24, 0x01
+ out TimeoutMSRemaining, r24
+
+Epilogue:
+ pop r24
+ out 0x3f, r24
+ pop r24
+ reti
+
+
\ No newline at end of file |