Added byte sized timer that can be used inside an 8-bit microcontroller ISR for up to 255mS of elapsed timing.

2010-12-10 23:16:02 +00:00
parent f5829ea483
commit 75249e0330
2 changed files with 26 additions and 2 deletions
@@ -303,6 +303,26 @@ void timer_interval_restart(
    }
 }

+/*************************************************************************
+* Description: Return the elapsed time
+* Returns: number of milliseconds elapsed
+* Notes: only up to 255ms elapsed
+**************************************************************************/
+uint8_t timer_milliseconds_delta(uint8_t start)
+{
+    return (timer_milliseconds_byte() - start);
+}
+
+/*************************************************************************
+* Description: Mark the start of a delta timer
+* Returns: mark timer starting tick
+* Notes: only up to 255ms elapsed
+**************************************************************************/
+uint8_t timer_milliseconds_mark(void)
+{
+    return timer_milliseconds_byte();
+}
+
 #ifdef TEST
 #include <assert.h>
 #include <string.h>