//! Basic blocking delay
//!
//! This module provides a basic asm-based blocking delay.
//! Borrowed from our good friends at Quartiq:
//! https://github.com/quartiq/stabilizer/blob/master/src/hardware/delay.rs
//!

use stm32f4xx_hal::hal::blocking::delay::{DelayMs, DelayUs};
// use stm32f4xx_hal::block;

/// A basic delay implementation.
pub struct AsmDelay {
    frequency_us: u32,
    frequency_ms: u32,
}

impl AsmDelay {
    /// Create a new delay.
    ///
    /// # Args
    /// * `freq` - The CPU core frequency.
    pub fn new(freq: u32) -> AsmDelay {
        AsmDelay {
            frequency_us: (freq / 1_000_000),
            frequency_ms: (freq / 1_000),
        }
    }
}

impl<U> DelayUs<U> for AsmDelay
where
    U: Into<u32>,
{
    fn delay_us(&mut self, us: U) {
        cortex_m::asm::delay(self.frequency_us * us.into())
    }
}

impl<U> DelayMs<U> for AsmDelay
where
    U: Into<u32>,
{
    fn delay_ms(&mut self, ms: U) {
        cortex_m::asm::delay(self.frequency_ms * ms.into())
    }
}