//! # API for the GPIO peripheral
//!
//! The implementation of this GPIO module is heavily based on the
//! [ATSAMD HAL implementation](https://docs.rs/atsamd-hal/latest/atsamd_hal/gpio/index.html).
//!
//! This API provides two different submodules, [pin] and [dynpin],
//! representing two different ways to handle GPIO pins. The default, [pin],
//! is a type-level API that tracks the state of each pin at compile-time. The
//! alternative, [dynpin] is a type-erased, value-level API that tracks the
//! state of each pin at run-time.
//!
//! The type-level API is strongly preferred. By representing the state of each
//! pin within the type system, the compiler can detect logic errors at
//! compile-time. Furthermore, the type-level API has absolutely zero run-time
//! cost.
//!
//! If needed, [dynpin] can be used to erase the type-level differences
//! between pins. However, by doing so, pins must now be tracked at run-time,
//! and each pin has a non-zero memory footprint.
//!
//! ## Examples
//!
//! - [Blinky example](https://egit.irs.uni-stuttgart.de/rust/va108xx-rs/src/branch/main/examples/simple/examples/blinky.rs)

#[derive(Debug, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct IsMaskedError;

macro_rules! common_reg_if_functions {
    () => {
        paste::paste!(
            #[inline]
            pub fn datamask(&self) -> bool {
                self.regs.datamask()
            }

            #[inline]
            pub fn clear_datamask(self) -> Self {
                self.regs.clear_datamask();
                self
            }

            #[inline]
            pub fn set_datamask(self) -> Self {
                self.regs.set_datamask();
                self
            }

            #[inline]
            pub fn is_high_masked(&self) -> Result<bool, crate::gpio::IsMaskedError> {
                self.regs.read_pin_masked()
            }

            #[inline]
            pub fn is_low_masked(&self) -> Result<bool, crate::gpio::IsMaskedError> {
                self.regs.read_pin_masked().map(|v| !v)
            }

            #[inline]
            pub fn set_high_masked(&mut self) -> Result<(), crate::gpio::IsMaskedError> {
                self.regs.write_pin_masked(true)
            }

            #[inline]
            pub fn set_low_masked(&mut self) -> Result<(), crate::gpio::IsMaskedError> {
                self.regs.write_pin_masked(false)
            }

            fn irq_enb(
                &mut self,
                irq_cfg: crate::IrqCfg,
                syscfg: Option<&mut va108xx::Sysconfig>,
                irqsel: Option<&mut va108xx::Irqsel>,
            ) {
                if syscfg.is_some() {
                    crate::clock::enable_peripheral_clock(
                        syscfg.unwrap(),
                        crate::clock::PeripheralClocks::Irqsel,
                    );
                }
                self.regs.enable_irq();
                if let Some(irqsel) = irqsel {
                    if irq_cfg.route {
                        match self.regs.id().group {
                            // Set the correct interrupt number in the IRQSEL register
                            DynGroup::A => {
                                irqsel
                                    .porta0(self.regs.id().num as usize)
                                    .write(|w| unsafe { w.bits(irq_cfg.irq as u32) });
                            }
                            DynGroup::B => {
                                irqsel
                                    .portb0(self.regs.id().num as usize)
                                    .write(|w| unsafe { w.bits(irq_cfg.irq as u32) });
                            }
                        }
                    }
                }
            }
        );
    };
}

pub mod dynpin;
pub use dynpin::*;

pub mod pin;
pub use pin::*;

mod reg;