diff options
| -rwxr-xr-x | cores/arduino/wiring_pulse.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/cores/arduino/wiring_pulse.c b/cores/arduino/wiring_pulse.c index 0157114..8f232f1 100755 --- a/cores/arduino/wiring_pulse.c +++ b/cores/arduino/wiring_pulse.c @@ -44,6 +44,11 @@ unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout) unsigned long numloops = 0; unsigned long maxloops = microsecondsToClockCycles(timeout) / 16; + // wait for any previous pulse to end + while ((*portInputRegister(port) & bit) == stateMask) + if (numloops++ == maxloops) + return 0; + // wait for the pulse to start while ((*portInputRegister(port) & bit) != stateMask) if (numloops++ == maxloops) |