tangent128/holiday_lights
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attempt to deglitch lights. dubious.

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This commit is contained in:
Tangent Wantwight 2024-10-02 21:10:58 -04:00
parent e745c55b51
commit ca70b50e49
1 changed files with 68 additions and 26 deletions
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46
itsybitsy_m0_lights/src/lib.rs
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@ -63,6 +63,47 @@ where
{ {
#[inline] #[inline]
pub fn write(&mut self, bit: bool) { pub fn write(&mut self, bit: bool) {
if bit {
unsafe {
compiler_fence(Ordering::SeqCst);
self.high_out.set_high().unwrap();
compiler_fence(Ordering::SeqCst);
asm!(
// 15 nops
"nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;",
"nop;", "nop;", "nop;", "nop;", "nop;",
);
compiler_fence(Ordering::SeqCst);
self.high_out.set_low().unwrap();
compiler_fence(Ordering::SeqCst);
asm!(
// 8 nops
"nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;",
);
compiler_fence(Ordering::SeqCst);
}
} else {
unsafe {
compiler_fence(Ordering::SeqCst);
self.high_out.set_high().unwrap();
compiler_fence(Ordering::SeqCst);
asm!(
// 8 nops
"nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;",
);
compiler_fence(Ordering::SeqCst);
self.high_out.set_low().unwrap();
compiler_fence(Ordering::SeqCst);
asm!(
// 15 nops
"nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;",
"nop;", "nop;", "nop;", "nop;", "nop;",
);
compiler_fence(Ordering::SeqCst);
}
}
if false {
// go high // go high
self.high_out.set_high().unwrap(); self.high_out.set_high().unwrap();
@ -82,8 +123,8 @@ where
compiler_fence(Ordering::SeqCst); compiler_fence(Ordering::SeqCst);
asm!( asm!(
// 14 nops // 14 nops
"nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;",
"nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;", "nop;",
); );
compiler_fence(Ordering::SeqCst); compiler_fence(Ordering::SeqCst);
} }
@ -102,6 +143,7 @@ where
compiler_fence(Ordering::SeqCst); compiler_fence(Ordering::SeqCst);
} }
} }
}
#[inline] #[inline]
pub fn byte(&mut self, byte: u8) { pub fn byte(&mut self, byte: u8) {