itm: inline cortex-m structs for fast v0.8 release

Refer to #15.

itm/Cargo.toml

@@ -28,12 +28,6 @@ git = "https://github.com/rtic-scope/nix.git"
 branch = "feat/termios-linux-arbitrary"
 optional = true
 
-[dependencies.cortex-m]
-version = "0.7"
-git = "https://github.com/rtic-scope/cortex-m"
-branch = "rtic-scope"
-features = ["serde"]
-
 [features]
 default = []
 serial = ["nix"]

itm/src/cortex_m.rs

@@ -0,0 +1,116 @@
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
+/// The possible local timestamp options.
+#[derive(Debug, Eq, PartialEq, Copy, Clone)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum LocalTimestampOptions {
+    /// Disable local timestamps.
+    Disabled,
+    /// Enable local timestamps and use no prescaling.
+    Enabled,
+    /// Enable local timestamps and set the prescaler to divide the
+    /// reference clock by 4.
+    EnabledDiv4,
+    /// Enable local timestamps and set the prescaler to divide the
+    /// reference clock by 16.
+    EnabledDiv16,
+    /// Enable local timestamps and set the prescaler to divide the
+    /// reference clock by 64.
+    EnabledDiv64,
+}
+
+/// Active exception number
+#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum VectActive {
+    /// Thread mode
+    ThreadMode,
+
+    /// Processor core exception (internal interrupts)
+    Exception(Exception),
+
+    /// Device specific exception (external interrupts)
+    Interrupt {
+        /// Interrupt number. This number is always within half open range `[0, 512)` (9 bit)
+        irqn: u16,
+    },
+}
+
+impl VectActive {
+    /// Converts a vector number into `VectActive`
+    #[inline]
+    pub fn from(vect_active: u16) -> Option<Self> {
+        Some(match vect_active {
+            0 => VectActive::ThreadMode,
+            2 => VectActive::Exception(Exception::NonMaskableInt),
+            3 => VectActive::Exception(Exception::HardFault),
+            4 => VectActive::Exception(Exception::MemoryManagement),
+            5 => VectActive::Exception(Exception::BusFault),
+            6 => VectActive::Exception(Exception::UsageFault),
+            7 => VectActive::Exception(Exception::SecureFault),
+            11 => VectActive::Exception(Exception::SVCall),
+            12 => VectActive::Exception(Exception::DebugMonitor),
+            14 => VectActive::Exception(Exception::PendSV),
+            15 => VectActive::Exception(Exception::SysTick),
+            irqn if (16..512).contains(&irqn) => VectActive::Interrupt { irqn: irqn - 16 },
+            _ => return None,
+        })
+    }
+}
+
+/// Processor core exceptions (internal interrupts)
+#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub enum Exception {
+    /// Non maskable interrupt
+    NonMaskableInt,
+
+    /// Hard fault interrupt
+    HardFault,
+
+    /// Memory management interrupt (not present on Cortex-M0 variants)
+    MemoryManagement,
+
+    /// Bus fault interrupt (not present on Cortex-M0 variants)
+    BusFault,
+
+    /// Usage fault interrupt (not present on Cortex-M0 variants)
+    UsageFault,
+
+    /// Secure fault interrupt (only on ARMv8-M)
+    SecureFault,
+
+    /// SV call interrupt
+    SVCall,
+
+    /// Debug monitor interrupt (not present on Cortex-M0 variants)
+    DebugMonitor,
+
+    /// Pend SV interrupt
+    PendSV,
+
+    /// System Tick interrupt
+    SysTick,
+}
+
+impl Exception {
+    /// Returns the IRQ number of this `Exception`
+    ///
+    /// The return value is always within the closed range `[-1, -14]`
+    #[inline]
+    pub fn irqn(self) -> i8 {
+        match self {
+            Exception::NonMaskableInt => -14,
+            Exception::HardFault => -13,
+            Exception::MemoryManagement => -12,
+            Exception::BusFault => -11,
+            Exception::UsageFault => -10,
+            Exception::SecureFault => -9,
+            Exception::SVCall => -5,
+            Exception::DebugMonitor => -4,
+            Exception::PendSV => -2,
+            Exception::SysTick => -1,
+        }
+    }
+}

itm/src/iter.rs

@@ -5,7 +5,7 @@ use super::{
 use std::io::Read;
 use std::time::Duration;
 
-pub use cortex_m::peripheral::itm::LocalTimestampOptions;
+pub use crate::cortex_m::LocalTimestampOptions;
 
 /// Iterator that yield [`TracePacket`](TracePacket).
 pub struct Singles<R>

itm/src/lib.rs

@@ -41,12 +41,14 @@ pub use iter::{
 #[cfg(feature = "serial")]
 pub mod serial;
 
+pub mod cortex_m;
+use cortex_m::VectActive;
+
 use std::convert::TryInto;
 use std::io::Read;
 
 use bitmatch::bitmatch;
 use bitvec::prelude::*;
-pub use cortex_m::peripheral::scb::VectActive;
 
 /// The set of valid packet types that can be decoded.
 #[derive(Debug, Clone, PartialEq)]

itm/tests/singles.rs

@@ -173,7 +173,7 @@ fn decode_exceptiontrace_packet() {
     assert_eq!(
         decoder.singles().next().unwrap().unwrap(),
         TracePacket::ExceptionTrace {
-            exception: cortex_m::peripheral::scb::VectActive::Interrupt { irqn: 16 },
+            exception: itm::cortex_m::VectActive::Interrupt { irqn: 16 },
             action: ExceptionAction::Returned,
         }
     );