Implements interrupts for GPIO pins.

rp2040-hal/src/gpio/mod.rs

@@ -63,6 +63,19 @@ pub enum OutputSlewRate {
     Fast,
 }
 
+#[derive(Clone, Copy, Eq, PartialEq, Debug)]
+/// Interrupt kind
+pub enum Interrupt {
+    /// While low
+    LevelLow,
+    /// While high
+    LevelHigh,
+    /// On falling edge
+    EdgeLow,
+    /// On rising edge
+    EdgeHigh,
+}
+
 #[derive(Clone, Copy, Eq, PartialEq, Debug)]
 /// Interrupt override state.
 pub enum InterruptOverride {

rp2040-hal/src/gpio/pin.rs

@@ -94,8 +94,8 @@
 //! [`AnyKind`]: crate::typelevel#anykind-trait-pattern
 use super::dynpin::{DynDisabled, DynInput, DynOutput, DynPinId, DynPinMode};
 use super::{
-    InputOverride, InterruptOverride, OutputDriveStrength, OutputEnableOverride, OutputOverride,
+    InputOverride, Interrupt, InterruptOverride, OutputDriveStrength, OutputEnableOverride,
-    OutputSlewRate,
+    OutputOverride, OutputSlewRate,
 };
 use crate::gpio::reg::RegisterInterface;
 use crate::typelevel::{Is, NoneT, Sealed};
@@ -547,6 +547,42 @@ where
         self.regs.write_slew_rate(rate)
     }
 
+    /// Clear interrupt.
+    #[inline]
+    pub fn clear_interrupt(&mut self, interrupt: Interrupt) {
+        self.regs.clear_interrupt(interrupt);
+    }
+
+    /// Interrupt status.
+    #[inline]
+    pub fn interrupt_status(&self, interrupt: Interrupt) -> bool {
+        self.regs.interrupt_status(interrupt)
+    }
+
+    /// Is interrupt enabled.
+    #[inline]
+    pub fn is_interrupt_enabled(&self, interrupt: Interrupt) -> bool {
+        self.regs.is_interrupt_enabled(interrupt)
+    }
+
+    /// Enable or disable interrupt.
+    #[inline]
+    pub fn set_interrupt_enabled(&self, interrupt: Interrupt, enabled: bool) {
+        self.regs.set_interrupt_enabled(interrupt, enabled);
+    }
+
+    /// Is interrupt forced.
+    #[inline]
+    pub fn is_interrupt_forced(&self, interrupt: Interrupt) -> bool {
+        self.regs.is_interrupt_forced(interrupt)
+    }
+
+    /// Force or release interrupt.
+    #[inline]
+    pub fn set_interrupt_forced(&self, interrupt: Interrupt, forced: bool) {
+        self.regs.set_interrupt_forced(interrupt, forced);
+    }
+
     /// Set the interrupt override.
     #[inline]
     pub fn set_interrupt_override(&mut self, override_value: InterruptOverride) {

rp2040-hal/src/gpio/reg.rs

@@ -1,8 +1,8 @@
 // Based heavily on and in some places copied from `atsamd-hal` gpio::v2
 use super::dynpin::{DynGroup, DynPinId};
 use super::{
-    InputOverride, InterruptOverride, OutputDriveStrength, OutputEnableOverride, OutputOverride,
+    InputOverride, Interrupt, InterruptOverride, OutputDriveStrength, OutputEnableOverride,
-    OutputSlewRate,
+    OutputOverride, OutputSlewRate,
 };
 use crate::gpio::dynpin::{DynDisabled, DynFunction, DynInput, DynOutput, DynPinMode};
 use crate::pac;
@@ -255,6 +255,101 @@ pub(super) unsafe trait RegisterInterface {
         }
     }
 
+    /// Clear interrupt.
+    #[inline]
+    fn clear_interrupt(&self, interrupt: Interrupt) {
+        let num = self.id().num as usize;
+        unsafe {
+            let io = &(*pac::IO_BANK0::ptr());
+            let reg = (&io.intr0).as_ptr().add(num / 8);
+            let bit_in_reg = num % 8 * 4 + interrupt as usize;
+            *reg |= 1 << bit_in_reg;
+        }
+    }
+
+    /// Interrupt status.
+    #[inline]
+    fn interrupt_status(&self, interrupt: Interrupt) -> bool {
+        let num = self.id().num as usize;
+        unsafe {
+            let cpuid = *(pac::SIO::ptr() as *const u32);
+            let io = &(*pac::IO_BANK0::ptr());
+            let reg = (&io.proc0_ints0)
+                .as_ptr()
+                .add(num / 8 + cpuid as usize * 12);
+            let bit_in_reg = num % 8 * 4 + interrupt as usize;
+            (*reg & (1 << bit_in_reg)) != 0
+        }
+    }
+
+    /// Is interrupt enabled.
+    #[inline]
+    fn is_interrupt_enabled(&self, interrupt: Interrupt) -> bool {
+        let num = self.id().num as usize;
+        unsafe {
+            let cpuid = *(pac::SIO::ptr() as *const u32);
+            let io = &(*pac::IO_BANK0::ptr());
+            let reg = (&io.proc0_inte0)
+                .as_ptr()
+                .add(num / 8 + cpuid as usize * 12);
+            let bit_in_reg = num % 8 * 4 + interrupt as usize;
+            (*reg & (1 << bit_in_reg)) != 0
+        }
+    }
+
+    /// Enable or disable interrupt.
+    #[inline]
+    fn set_interrupt_enabled(&self, interrupt: Interrupt, enabled: bool) {
+        let num = self.id().num as usize;
+        unsafe {
+            let cpuid = *(pac::SIO::ptr() as *const u32);
+            let io = &(*pac::IO_BANK0::ptr());
+            let reg = (&io.proc0_inte0)
+                .as_ptr()
+                .add(num / 8 + cpuid as usize * 12);
+            let bit_in_reg = num % 8 * 4 + interrupt as usize;
+            if enabled {
+                *reg |= 1 << bit_in_reg;
+            } else {
+                *reg &= !(1 << bit_in_reg);
+            }
+        }
+    }
+
+    /// Is interrupt forced.
+    #[inline]
+    fn is_interrupt_forced(&self, interrupt: Interrupt) -> bool {
+        let num = self.id().num as usize;
+        unsafe {
+            let cpuid = *(pac::SIO::ptr() as *const u32);
+            let io = &(*pac::IO_BANK0::ptr());
+            let reg = (&io.proc0_intf0)
+                .as_ptr()
+                .add(num / 8 + cpuid as usize * 12);
+            let bit_in_reg = num % 8 * 4 + interrupt as usize;
+            (*reg & (1 << bit_in_reg)) != 0
+        }
+    }
+
+    /// Force or release interrupt.
+    #[inline]
+    fn set_interrupt_forced(&self, interrupt: Interrupt, forced: bool) {
+        let num = self.id().num as usize;
+        unsafe {
+            let cpuid = *(pac::SIO::ptr() as *const u32);
+            let io = &(*pac::IO_BANK0::ptr());
+            let reg = (&io.proc0_intf0)
+                .as_ptr()
+                .add(num / 8 + cpuid as usize * 12);
+            let bit_in_reg = num % 8 * 4 + interrupt as usize;
+            if forced {
+                *reg |= 1 << bit_in_reg;
+            } else {
+                *reg &= !(1 << bit_in_reg);
+            }
+        }
+    }
+
     /// Set the interrupt override.
     #[inline]
     fn set_interrupt_override(&self, override_value: InterruptOverride) {