Commit c437761

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pulseIn: be consistent with standard API

return 0 if timeout has been reached

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Lines changed: 6 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -48,7 +48,12 @@ unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout)`
`48`	`48`	`unsigned long maxloops = microsecondsToClockCycles(timeout)/16;`
`49`	`49`
`50`	`50`	`width = countPulseASM(portInputRegister(port), bit, stateMask, maxloops);`
`51`		`- return clockCyclesToMicroseconds(width * 16 + 16);`
	`51`	`+`
	`52`	`+ //prevent clockCyclesToMicroseconds to return bogus values if countPulseASM timed out`
	`53`	`+ if (width)`
	`54`	`+ return clockCyclesToMicroseconds(width * 16 + 16);`
	`55`	`+ else`
	`56`	`+ return 0;`
`52`	`57`	`}`
`53`	`58`
`54`	`59`	`/* Measures the length (in microseconds) of a pulse on the pin; state is HIGH`

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