75 lines
1.5 KiB
Rust
75 lines
1.5 KiB
Rust
//! Delays
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use cast::u32;
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use cortex_m::peripheral::syst::SystClkSource;
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use cortex_m::peripheral::SYST;
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use hal::blocking::delay::{DelayMs, DelayUs};
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use crate::cs::Clocks;
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/// System timer (SysTick) as a delay provider
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pub struct Delay {
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clocks: Clocks,
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syst: SYST,
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}
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impl Delay {
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/// Configure the system timer (SysTick) as a delay provider
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pub fn new(mut syst: SYST, clocks: Clocks) -> Self {
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syst.set_clock_source(SystClkSource::Core);
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Delay { syst, clocks }
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}
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/// Release the system timer (SysTick) resource
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pub fn free(self) -> SYST {
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self.syst
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}
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}
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impl DelayMs<u32> for Delay {
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fn delay_ms(&mut self, ms: u32) {
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self.delay_us(ms * 1_000);
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}
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}
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impl DelayMs<u16> for Delay {
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fn delay_ms(&mut self, ms: u16) {
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self.delay_ms(u32(ms));
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}
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}
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impl DelayMs<u8> for Delay {
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fn delay_ms(&mut self, ms: u8) {
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self.delay_ms(u32(ms));
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}
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}
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impl DelayUs<u32> for Delay {
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fn delay_us(&mut self, us: u32) {
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let rvr = us * (self.clocks.sysclk().0 / 1_000_000);
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assert!(rvr < (1 << 24));
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self.syst.set_reload(rvr);
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self.syst.clear_current();
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self.syst.enable_counter();
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while !self.syst.has_wrapped() {}
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self.syst.disable_counter();
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}
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}
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impl DelayUs<u16> for Delay {
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fn delay_us(&mut self, us: u16) {
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self.delay_us(u32(us));
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}
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}
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impl DelayUs<u8> for Delay {
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fn delay_us(&mut self, us: u8) {
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self.delay_us(u32(us));
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}
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}
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