diff --git a/embassy-rp/src/gpio.rs b/embassy-rp/src/gpio.rs
index 31397172c..520043b07 100644
--- a/embassy-rp/src/gpio.rs
+++ b/embassy-rp/src/gpio.rs
@@ -16,9 +16,9 @@ use crate::{interrupt, pac, peripherals, Peripheral, RegExt};
 const NEW_AW: AtomicWaker = AtomicWaker::new();
 
 #[cfg(any(feature = "rp2040", feature = "rp235xa"))]
-const BANK0_PIN_COUNT: usize = 30;
+pub(crate) const BANK0_PIN_COUNT: usize = 30;
 #[cfg(feature = "rp235xb")]
-const BANK0_PIN_COUNT: usize = 48;
+pub(crate) const BANK0_PIN_COUNT: usize = 48;
 
 static BANK0_WAKERS: [AtomicWaker; BANK0_PIN_COUNT] = [NEW_AW; BANK0_PIN_COUNT];
 #[cfg(feature = "qspi-as-gpio")]
diff --git a/embassy-rp/src/pio/mod.rs b/embassy-rp/src/pio/mod.rs
index e8e411a25..fc940b045 100644
--- a/embassy-rp/src/pio/mod.rs
+++ b/embassy-rp/src/pio/mod.rs
@@ -5,7 +5,7 @@ use core::pin::Pin as FuturePin;
 use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::{Context, Poll};
 
-use atomic_polyfill::{AtomicU32, AtomicU8};
+use atomic_polyfill::{AtomicU64, AtomicU8};
 use embassy_hal_internal::{into_ref, Peripheral, PeripheralRef};
 use embassy_sync::waitqueue::AtomicWaker;
 use fixed::types::extra::U8;
@@ -1305,7 +1305,7 @@ impl<'d, PIO: Instance> Pio<'d, PIO> {
 // other way.
 pub struct State {
     users: AtomicU8,
-    used_pins: AtomicU32,
+    used_pins: AtomicU64,
 }
 
 fn on_pio_drop<PIO: Instance>() {
@@ -1313,8 +1313,7 @@ fn on_pio_drop<PIO: Instance>() {
     if state.users.fetch_sub(1, Ordering::AcqRel) == 1 {
         let used_pins = state.used_pins.load(Ordering::Relaxed);
         let null = pac::io::vals::Gpio0ctrlFuncsel::NULL as _;
-        // we only have 30 pins. don't test the other two since gpio() asserts.
-        for i in 0..30 {
+        for i in 0..crate::gpio::BANK0_PIN_COUNT {
             if used_pins & (1 << i) != 0 {
                 pac::IO_BANK0.gpio(i).ctrl().write(|w| w.set_funcsel(null));
             }
@@ -1339,7 +1338,7 @@ trait SealedInstance {
     fn state() -> &'static State {
         static STATE: State = State {
             users: AtomicU8::new(0),
-            used_pins: AtomicU32::new(0),
+            used_pins: AtomicU64::new(0),
         };
 
         &STATE