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//! `no_std` HAL for the ESP32 from Espressif.
//!
//! Implements a number of the traits defined by the various packages in the
//! [embedded-hal] repository.
//!
//! [embedded-hal]: https://github.com/rust-embedded/embedded-hal

#![no_std]
#![doc(html_logo_url = "https://avatars.githubusercontent.com/u/46717278")]

pub use esp_hal_common::*;

/// Common module for analog functions
pub mod analog {
    pub use esp_hal_common::analog::{AvailableAnalog, SensExt};
}

/// Function initializes ESP32 specific memories (RTC slow and fast) and
/// then calls original Reset function
///
/// ENTRY point is defined in memory.x
/// *Note: the pre_init function is called in the original reset handler
/// after the initializations done in this function*
#[cfg(feature = "rt")]
#[doc(hidden)]
#[no_mangle]
pub unsafe extern "C" fn ESP32Reset() -> ! {
    // These symbols come from `memory.x`
    extern "C" {
        static mut _rtc_fast_bss_start: u32;
        static mut _rtc_fast_bss_end: u32;

        static mut _rtc_slow_bss_start: u32;
        static mut _rtc_slow_bss_end: u32;

        static mut _stack_end_cpu0: u32;
    }

    // set stack pointer to end of memory: no need to retain stack up to this point
    esp_hal_common::xtensa_lx::set_stack_pointer(&mut _stack_end_cpu0);

    // copying data from flash to various data segments is done by the bootloader
    // initialization to zero needs to be done by the application

    // Initialize RTC RAM
    esp_hal_common::xtensa_lx_rt::zero_bss(&mut _rtc_fast_bss_start, &mut _rtc_fast_bss_end);
    esp_hal_common::xtensa_lx_rt::zero_bss(&mut _rtc_slow_bss_start, &mut _rtc_slow_bss_end);

    // continue with default reset handler
    esp_hal_common::xtensa_lx_rt::Reset();
}

/// The ESP32 has a first stage bootloader that handles loading program data
/// into the right place therefore we skip loading it again.
#[doc(hidden)]
#[no_mangle]
#[rustfmt::skip]
pub extern "Rust" fn __init_data() -> bool {
    false
}