Reexport NVIC_PRIO_BITS at HAL root.

This allows using RTIC with `#[rtic::app(device = embassy_nrf, ...)]`

embassy-nrf/src/chips/nrf5340_app.rs

@@ -5,6 +5,8 @@ pub mod pac {
     // The nRF5340 has a secure and non-secure (NS) mode.
     // To avoid cfg spam, we remove _ns or _s suffixes here.
 
+    pub use nrf5340_app_pac::NVIC_PRIO_BITS;
+    
     #[doc(no_inline)]
     pub use nrf5340_app_pac::{
         interrupt,

embassy-nrf/src/chips/nrf5340_net.rs

@@ -5,6 +5,8 @@ pub mod pac {
     // The nRF5340 has a secure and non-secure (NS) mode.
     // To avoid cfg spam, we remove _ns or _s suffixes here.
 
+    pub use nrf5340_net_pac::NVIC_PRIO_BITS;
+
     #[doc(no_inline)]
     pub use nrf5340_net_pac::{
         interrupt,

embassy-nrf/src/chips/nrf9160.rs

@@ -5,6 +5,8 @@ pub mod pac {
     // The nRF9160 has a secure and non-secure (NS) mode.
     // To avoid cfg spam, we remove _ns or _s suffixes here.
 
+    pub use nrf9160_pac::NVIC_PRIO_BITS;
+
     #[doc(no_inline)]
     pub use nrf9160_pac::{
         interrupt,

embassy-nrf/src/lib.rs

@@ -93,8 +93,6 @@ pub mod wdt;
 #[cfg_attr(feature = "_nrf9160", path = "chips/nrf9160.rs")]
 mod chip;
 
-pub use crate::chip::interrupt;
-
 /// Macro to bind interrupts to handlers.
 ///
 /// This defines the right interrupt handlers, and creates a unit struct (like `struct Irqs;`)
@@ -132,6 +130,9 @@ pub use chip::{peripherals, Peripherals, EASY_DMA_SIZE};
 pub use embassy_cortex_m::executor;
 pub use embassy_hal_common::{into_ref, Peripheral, PeripheralRef};
 
+pub use crate::chip::interrupt;
+pub use crate::pac::NVIC_PRIO_BITS;
+
 pub mod config {
     //! Configuration options used when initializing the HAL.
 

embassy-rp/src/lib.rs

@@ -43,6 +43,8 @@ pub use rp_pac as pac;
 #[cfg(not(feature = "unstable-pac"))]
 pub(crate) use rp_pac as pac;
 
+pub use crate::pac::NVIC_PRIO_BITS;
+
 embassy_cortex_m::interrupt_mod!(
     TIMER_IRQ_0,
     TIMER_IRQ_1,

embassy-stm32/src/lib.rs

@@ -111,6 +111,8 @@ pub use stm32_metapac as pac;
 #[cfg(not(feature = "unstable-pac"))]
 pub(crate) use stm32_metapac as pac;
 
+pub use crate::pac::NVIC_PRIO_BITS;
+
 #[non_exhaustive]
 pub struct Config {
     pub rcc: rcc::Config,