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//! no_std implementation of DelayMs and DelayUs for cortex-m

#![deny(missing_docs)]
#![no_std]

use cortex_m::asm::delay;

use embedded_hal::blocking::delay::DelayMs;
use embedded_hal::blocking::delay::DelayUs;

/// asm::delay based Timer
pub struct AsmDelay {
    freq_base_ms: u32,
    freq_base_us: u32,
}

impl AsmDelay {
    /// Consturct new delay timer of CPU frequency (Hertz)
    pub fn new(freq_hz: u32) -> Self {
        AsmDelay {
            freq_base_ms: freq_hz / 1_000,
            freq_base_us: freq_hz / 1_000_000,
        }
    }
}

impl<U> DelayMs<U> for AsmDelay
where
    U: Into<u32>,
{
    fn delay_ms(&mut self, ms: U) {
        delay(self.freq_base_ms * ms.into())
    }
}
impl<U> DelayUs<U> for AsmDelay
where
    U: Into<u32>,
{
    fn delay_us(&mut self, us: U) {
        delay(self.freq_base_us * us.into())
    }
}