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Code Issues Releases Activity

pulseIn: be consistent with standard API

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return 0 if timeout has been reached
This commit is contained in:
Martino Facchin 2015-03-02 13:47:16 +01:00
parent 689c654e8d
commit 7a22827359
1 changed files with 6 additions and 1 deletions
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7
hardware/arduino/avr/cores/arduino/wiring_pulse.c
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@ -48,7 +48,12 @@ unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout)
unsigned long maxloops = microsecondsToClockCycles(timeout)/16;
width = countPulseASM(portInputRegister(port), bit, stateMask, maxloops);
return clockCyclesToMicroseconds(width * 16 + 16);
//prevent clockCyclesToMicroseconds to return bogus values if countPulseASM timed out
if (width)
return clockCyclesToMicroseconds(width * 16 + 16);
else
return 0;
}
/* Measures the length (in microseconds) of a pulse on the pin; state is HIGH