Increased possible pulsein length to 32 ms.

Author: DavePutz

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

@@ -39,6 +39,8 @@
 pulseio_pulsein_obj_t *save_self;
 
 #define NO_PIN 0xff
+#define MAX_PULSE 32678
+#define MIN_PULSE 10
 volatile bool last_level;
 volatile uint16_t level_count = 0;
 volatile uint16_t result = 0;
@@ -139,15 +141,15 @@ void common_hal_pulseio_pulsein_interrupt() {
             last_level = level;
             level_count = 1;
             // ignore pulses that are too long and too short
-            if (result < 4000 && result > 10) {
+            if (result < MAX_PULSE && result > MIN_PULSE) {
                 self->buffer[buf_index] = result;
                 buf_index++;
                 self->len++;
             }
         }
     }
-// check for a pulse thats too long (4000 us) or maxlen reached,  and reset
-    if ((level_count > 4000) || (buf_index >= self->maxlen)) {
+// check for a pulse thats too long (MAX_PULSE us) or maxlen reached,  and reset
+    if ((level_count > MAX_PULSE) || (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);
         pio_sm_restart(self->state_machine.pio,self->state_machine.state_machine);
@@ -180,6 +182,7 @@ void common_hal_pulseio_pulsein_resume(pulseio_pulsein_obj_t *self,
 void common_hal_pulseio_pulsein_clear(pulseio_pulsein_obj_t *self) {
     self->start = 0;
     self->len = 0;
+    buf_index = 0;
 }
 
 uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t *self) {