//! A delay driver based on SysTick. use crate::peripheral::{syst::SystClkSource, SYST}; use embedded_hal::blocking::delay::{DelayMs, DelayUs}; /// System timer (SysTick) as a delay provider. pub struct Delay { syst: SYST, ahb_frequency: u32, } impl Delay { /// Configures the system timer (SysTick) as a delay provider. /// /// `ahb_frequency` is a frequency of the AHB bus in Hz. #[inline] pub fn new(mut syst: SYST, ahb_frequency: u32) -> Self { syst.set_clock_source(SystClkSource::Core); Delay { syst, ahb_frequency } } /// Releases the system timer (SysTick) resource. #[inline] pub fn free(self) -> SYST { self.syst } fn _delay_us(&mut self, us: u32) { let ticks = (us as u64) * (self.ahb_frequency as u64) / 1_000_000; let full_cycles = ticks >> 24; if full_cycles > 0 { self.syst.set_reload(0xffffff); self.syst.clear_current(); self.syst.enable_counter(); for _ in 0..full_cycles { while !self.syst.has_wrapped() {} } } let ticks = (ticks & 0xffffff) as u32; if ticks > 1 { self.syst.set_reload(ticks - 1); self.syst.clear_current(); self.syst.enable_counter(); while !self.syst.has_wrapped() {} } self.syst.disable_counter(); } } impl DelayMs for Delay { #[inline] fn delay_ms(&mut self, mut ms: u32) { // 4294967 is the highest u32 value which you can multiply by 1000 without overflow while ms > 4294967 { self.delay_us(4294967000u32); ms -= 4294967; } self.delay_us(ms * 1_000); } } // This is a workaround to allow `delay_ms(42)` construction without specifying a type. impl DelayMs for Delay { #[inline(always)] fn delay_ms(&mut self, ms: i32) { assert!(ms >= 0); self.delay_ms(ms as u32); } } impl DelayMs for Delay { #[inline(always)] fn delay_ms(&mut self, ms: u16) { self.delay_ms(u32::from(ms)); } } impl DelayMs for Delay { #[inline(always)] fn delay_ms(&mut self, ms: u8) { self.delay_ms(u32::from(ms)); } } impl DelayUs for Delay { #[inline] fn delay_us(&mut self, us: u32) { self._delay_us(us); } } // This is a workaround to allow `delay_us(42)` construction without specifying a type. impl DelayUs for Delay { #[inline(always)] fn delay_us(&mut self, us: i32) { assert!(us >= 0); self.delay_us(us as u32); } } impl DelayUs for Delay { #[inline(always)] fn delay_us(&mut self, us: u16) { self.delay_us(u32::from(us)) } } impl DelayUs for Delay { #[inline(always)] fn delay_us(&mut self, us: u8) { self.delay_us(u32::from(us)) } } ave/zlib'>dave/zlib Unnamed repository; edit this file 'description' to name the repository.
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2022-06-22change the directory structurejarred/renameGravatar Jarred Sumner 1-104/+0
2022-06-22maybe improve CPP build timeGravatar Jarred Sumner 1-24/+37
2022-06-22Move builtins to src/javascript/jsc/builtinsGravatar Jarred Sumner 72-6/+2285
2022-06-22Tweak test runner outputGravatar Jarred Sumner 1-90/+44
2022-06-22Cleanup some testsGravatar Jarred Sumner 2-8/+46
2022-06-22Update Dockerfile.baseGravatar Jarred Sumner 1-1/+1
2022-06-22Update WebKitGravatar Jarred Sumner 1-0/+0
2022-06-22cleanup websocket testGravatar Jarred Sumner 1-3/+6
2022-06-22Fix `WebSocket` when HTTP server is not runningGravatar Jarred Sumner 14-38/+103
2022-06-22Update build-idGravatar Jarred Sumner 1-1/+1
2022-06-22cleanupGravatar Jarred Sumner 6-719/+3
2022-06-22Update index.d.tsGravatar Jarred Sumner 1-0/+1
2022-06-22types for `bun:jsc`Gravatar Jarred Sumner 2-1/+37
2022-06-22Slightly customize the `events` polyfill so it uses ESMGravatar Jarred Sumner 1-1/+522
2022-06-22Fix memory bugs in escapeHTML & arrayBufferToStringGravatar Jarred Sumner 1-65/+61