diff --git a/ports/raspberrypi/common-hal/pulseio/PulseIn.c b/ports/raspberrypi/common-hal/pulseio/PulseIn.c
index 71633fcef7..557cb090c7 100644
--- a/ports/raspberrypi/common-hal/pulseio/PulseIn.c
+++ b/ports/raspberrypi/common-hal/pulseio/PulseIn.c
@@ -40,7 +40,7 @@
 #define MAX_PULSE 65535
 #define MIN_PULSE 10
 
-uint16_t pulsein_program[] = {
+static const uint16_t pulsein_program[] = {
     0x4001, //  1: in     pins, 1
 };
 
@@ -57,29 +57,23 @@ void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t *self,
     self->start = 0;
     self->len = 0;
 
-    bool ok = rp2pio_statemachine_construct(&self->state_machine,
-        pulsein_program, sizeof(pulsein_program) / sizeof(pulsein_program[0]),
-        1000000,
-        NULL, 0,
-        NULL, 0,
-        pin, 1,
-        0,0,
-        NULL, 0,
-        NULL, 0,
-        1, 0,
-        NULL, // jump pin
-        1 << self->pin, false, true,
-            false, 8, false, // TX, unused
-            false,
-            true, 32, true, // RX auto-push every 32 bits
-            false, // claim pins
-            false, // Not user-interruptible.
-            false, // No sideset enable
-            0, -1); // wrap settings
-
-    if (!ok) {
-        mp_raise_RuntimeError(translate("All state machines in use"));
-    }
+    common_hal_rp2pio_statemachine_construct(&self->state_machine,
+        pulsein_program, MP_ARRAY_SIZE(pulsein_program),
+        1000000, // frequency
+        NULL, 0, // init, init_len
+        NULL, 0, 0, 0, // first out pin, # out pins, initial_out_pin_state
+        pin, 1, 0, 0, // first in pin, # in pins
+        NULL, 0, 0, 0, // first set pin
+        NULL, 0, 0, 0, // first sideset pin
+        false, // No sideset enable
+        NULL, PULL_NONE, // jump pin, jmp_pull
+        0, // wait gpio pins
+        true, // exclusive pin usage
+        false, 8, false, // TX, setting we don't use
+        false, // wait for TX stall
+        true, 32, true, // RX auto pull every 32 bits. shift left to output msb first
+        false, // Not user-interruptible.
+        0, -1); // wrap settings
 
     pio_sm_set_enabled(self->state_machine.pio,self->state_machine.state_machine, false);
     pio_sm_clear_fifos(self->state_machine.pio,self->state_machine.state_machine);