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Merge pull request #494 from jannic/pio-change-clkdiv

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Allow setting clock divisors on running state machines
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Jan Niehusmann 2022-11-17 09:35:39 +01:00 committed by GitHub
parent c5309f6a86 2f077a434b
commit 4b2b33b950
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1 changed files with 22 additions and 14 deletions
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36
rp2040-hal/src/pio.rs
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@ -636,6 +636,28 @@ impl<SM: ValidStateMachine, State> StateMachine<SM, State> {
} }
} }
} }
/// Change the clock divider of a state machine.
///
/// Changing the clock divider of a running state machine is allowed
/// and guaranteed to not cause any glitches, but the exact timing of
/// clock pulses during the change is not specified.
pub fn set_clock_divisor(&mut self, divisor: f32) {
// sm frequency = clock freq / (CLKDIV_INT + CLKDIV_FRAC / 256)
let int = divisor as u16;
let frac = ((divisor - int as f32) * 256.0) as u8;
self.sm.set_clock_divisor(int, frac);
}
/// Change the clock divider of a state machine using a 16.8 fixed point value.
///
/// Changing the clock divider of a running state machine is allowed
/// and guaranteed to not cause any glitches, but the exact timing of
/// clock pulses during the change is not specified.
pub fn clock_divisor_fixed_point(&mut self, int: u16, frac: u8) {
self.sm.set_clock_divisor(int, frac);
}
} }
// Safety: All shared register accesses are atomic. // Safety: All shared register accesses are atomic.
@ -656,20 +678,6 @@ impl<SM: ValidStateMachine> StateMachine<SM, Stopped> {
} }
} }
/// Change the clock divider of a stopped state machine.
pub fn set_clock_divisor(&mut self, divisor: f32) {
// sm frequency = clock freq / (CLKDIV_INT + CLKDIV_FRAC / 256)
let int = divisor as u16;
let frac = ((divisor - int as f32) * 256.0) as u8;
self.sm.set_clock_divisor(int, frac);
}
/// Change the clock divider of a stopped state machine using a 16.8 fixed point value.
pub fn clock_divisor_fixed_point(&mut self, int: u16, frac: u8) {
self.sm.set_clock_divisor(int, frac);
}
/// Sets the pin state for the specified pins. /// Sets the pin state for the specified pins.
/// ///
/// The user has to make sure that they do not select any pins that are in use by any /// The user has to make sure that they do not select any pins that are in use by any