Merge pull request #1 from bogdan-petru/import/mcxa276-initial

feat(mcxa276): initial HAL import

1 files changed, 142 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 000000000..fe27aadba
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,142 @@
+#![no_std]
+
+pub mod clocks; // still provide clock helpers
+pub mod gpio;
+pub mod pins; // pin mux helpers
+pub mod reset; // reset control helpers
+
+pub mod adc;
+pub mod config;
+pub mod interrupt;
+pub mod lpuart;
+pub mod ostimer;
+pub mod rtc;
+pub mod uart;
+
+embassy_hal_internal::peripherals!(LPUART2, OSTIMER0, GPIO, RTC0, ADC1,);
+
+/// Get access to the PAC Peripherals for low-level register access.
+/// This is a lazy-initialized singleton that can be called after init().
+#[allow(static_mut_refs)]
+pub fn pac() -> &'static pac::Peripherals {
+    // SAFETY: We only call this after init(), and the PAC is a singleton.
+    // The embassy peripheral tokens ensure we don't have multiple mutable accesses.
+    unsafe {
+        static mut PAC_INSTANCE: Option<pac::Peripherals> = None;
+        if PAC_INSTANCE.is_none() {
+            PAC_INSTANCE = Some(pac::Peripherals::steal());
+        }
+        PAC_INSTANCE.as_ref().unwrap()
+    }
+}
+
+// Use cortex-m-rt's #[interrupt] attribute directly; PAC does not re-export it.
+
+// Re-export interrupt traits and types
+pub use adc::Adc1 as Adc1Token;
+pub use gpio::pins::*;
+pub use gpio::{AnyPin, Flex, Gpio as GpioToken, Input, Level, Output};
+pub use interrupt::InterruptExt;
+#[cfg(feature = "unstable-pac")]
+pub use mcxa_pac as pac;
+#[cfg(not(feature = "unstable-pac"))]
+pub(crate) use mcxa_pac as pac;
+pub use ostimer::Ostimer0 as Ostimer0Token;
+pub use rtc::Rtc0 as Rtc0Token;
+pub use uart::Lpuart2 as Uart2Token;
+
+/// Initialize HAL with configuration (mirrors embassy-imxrt style). Minimal: just take peripherals.
+/// Also applies configurable NVIC priority for the OSTIMER OS_EVENT interrupt (no enabling).
+#[allow(unused_variables)]
+pub fn init(cfg: crate::config::Config) -> Peripherals {
+    let peripherals = Peripherals::take();
+    // Apply user-configured priority early; enabling is left to examples/apps
+    crate::interrupt::OS_EVENT.set_priority(cfg.time_interrupt_priority);
+    // Apply user-configured priority early; enabling is left to examples/apps
+    crate::interrupt::RTC.set_priority(cfg.rtc_interrupt_priority);
+    // Apply user-configured priority early; enabling is left to examples/apps
+    crate::interrupt::ADC1.set_priority(cfg.adc_interrupt_priority);
+    peripherals
+}
+
+/// Optional hook called by cortex-m-rt before RAM init.
+/// We proactively mask and clear all NVIC IRQs to avoid wedges from stale state
+/// left by soft resets/debug sessions.
+///
+/// NOTE: Manual VTOR setup is required for RAM execution. The cortex-m-rt 'set-vtor'
+/// feature is incompatible with our setup because it expects __vector_table to be
+/// defined differently than how our RAM-based linker script arranges it.
+#[no_mangle]
+pub unsafe extern "C" fn __pre_init() {
+    // Set the VTOR to point to the interrupt vector table in RAM
+    // This is required since code runs from RAM on this MCU
+    crate::interrupt::vtor_set_ram_vector_base(0x2000_0000 as *const u32);
+
+    // Mask and clear pending for all NVIC lines (0..127) to avoid stale state across runs.
+    let nvic = &*cortex_m::peripheral::NVIC::PTR;
+    for i in 0..4 {
+        // 4 words x 32 = 128 IRQs
+        nvic.icer[i].write(0xFFFF_FFFF);
+        nvic.icpr[i].write(0xFFFF_FFFF);
+    }
+    // Do NOT touch peripheral registers here: clocks may be off and accesses can fault.
+    crate::interrupt::clear_default_handler_snapshot();
+}
+
+/// Internal helper to dispatch a type-level interrupt handler.
+#[inline(always)]
+#[doc(hidden)]
+pub unsafe fn __handle_interrupt<T, H>()
+where
+    T: crate::interrupt::typelevel::Interrupt,
+    H: crate::interrupt::typelevel::Handler<T>,
+{
+    H::on_interrupt();
+}
+
+/// Macro to bind interrupts to handlers, similar to embassy-imxrt.
+///
+/// Example:
+/// - Bind OS_EVENT to the OSTIMER time-driver handler
+///   bind_interrupts!(struct Irqs { OS_EVENT => crate::ostimer::time_driver::OsEventHandler; });
+#[macro_export]
+macro_rules! bind_interrupts {
+    ($(#[$attr:meta])* $vis:vis struct $name:ident {
+        $(
+            $(#[cfg($cond_irq:meta)])?
+            $irq:ident => $(
+                $(#[cfg($cond_handler:meta)])?
+                $handler:ty
+            ),*;
+        )*
+    }) => {
+        #[derive(Copy, Clone)]
+        $(#[$attr])*
+        $vis struct $name;
+
+        $(
+            #[allow(non_snake_case)]
+            #[no_mangle]
+            $(#[cfg($cond_irq)])?
+            unsafe extern "C" fn $irq() {
+                unsafe {
+                    $(
+                        $(#[cfg($cond_handler)])?
+                        <$handler as $crate::interrupt::typelevel::Handler<$crate::interrupt::typelevel::$irq>>::on_interrupt();
+                    )*
+                }
+            }
+
+            $(#[cfg($cond_irq)])?
+            $crate::bind_interrupts!(@inner
+                $(
+                    $(#[cfg($cond_handler)])?
+                    unsafe impl $crate::interrupt::typelevel::Binding<$crate::interrupt::typelevel::$irq, $handler> for $name {}
+                )*
+            );
+        )*
+    };
+    (@inner $($t:tt)*) => {
+        $($t)*
+    }
+}