Added check for maxlen

Author: siehputz

ports/raspberrypi/common-hal/pulseio/PulseIn.c

@@ -1,4 +1,4 @@
-b/*
+/*
  * This file is part of the MicroPython project, http://micropython.org/
  *
  * The MIT License (MIT)
@@ -163,7 +163,7 @@ void common_hal_pulseio_pulsein_interrupt() {
     irq_clear(self->pio_interrupt);
     hw_clear_bits(&self->state_machine.pio->inte0, 1u << self->state_machine.state_machine);
     self->state_machine.pio->irq = 1u << self->state_machine.state_machine;
-// check for a pulse thats too long (2000 us) or maxlen reached,  and reset
+// check for a pulse thats too long (4000 us) or maxlen reached,  and reset
     if (( level_count > 4000 ) || (buf_index >= self->maxlen)) {
        pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, false);
        pio_sm_init(self->state_machine.pio, self->state_machine.state_machine, self->state_machine.offset, &self->state_machine.sm_config);