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Simplifying microseconds <-> clock cycles conversions. (Rob Tillaart) 

This should fix problems with overflows in pulseIn().  It may make millis() slightly less precise for clock speeds that aren't multiple of 1 million, but we don't really support those anyway.

http://code.google.com/p/arduino/issues/detail?id=675
This commit is contained in:
David A. Mellis 2011-12-30 18:05:12 -05:00
parent 5184064486
commit 3ece2827a4
1 changed files with 2 additions and 2 deletions
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4
cores/arduino/Arduino.h
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@ -73,8 +73,8 @@ extern "C"{
#define noInterrupts() cli()
#define clockCyclesPerMicrosecond() ( F_CPU / 1000000L )
#define clockCyclesToMicroseconds(a) ( ((a) * 1000L) / (F_CPU / 1000L) )
#define microsecondsToClockCycles(a) ( ((a) * (F_CPU / 1000L)) / 1000L )
#define clockCyclesToMicroseconds(a) ( (a) / clockCyclesPerMicrosecond() )
#define microsecondsToClockCycles(a) ( (a) * clockCyclesPerMicrosecond() )
#define lowByte(w) ((uint8_t) ((w) & 0xff))
#define highByte(w) ((uint8_t) ((w) >> 8))