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hrtim: add guardrails on bridge sec. duty

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This commit is contained in:
xoviat 2023-07-02 09:17:12 -05:00
parent aceba1c03f
commit 2e6b813225
1 changed files with 18 additions and 3 deletions
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21
embassy-stm32/src/pwm/advanced_pwm.rs
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@ -177,7 +177,7 @@ impl<T: HighResolutionCaptureCompare16bitInstance> BurstController<T> {
/// Represents a fixed-frequency bridge converter
///
/// Our implementation of the bridge converter uses a single channel and two compare registers,
/// Our implementation of the bridge converter uses a single channel and three compare registers,
/// allowing implementation of a synchronous buck or boost converter in continuous or discontinuous
/// conduction mode.
///
@ -189,6 +189,8 @@ pub struct BridgeConverter<T: HighResolutionCaptureCompare16bitInstance, C: Adva
channel: PhantomData<C>,
dead_time: u16,
primary_duty: u16,
min_secondary_duty: u16,
max_secondary_duty: u16,
}
impl<T: HighResolutionCaptureCompare16bitInstance, C: AdvancedChannel<T>> BridgeConverter<T, C> {
@ -244,6 +246,8 @@ impl<T: HighResolutionCaptureCompare16bitInstance, C: AdvancedChannel<T>> Bridge
channel: PhantomData,
dead_time: 0,
primary_duty: 0,
min_secondary_duty: 0,
max_secondary_duty: 0,
}
}
@ -280,16 +284,19 @@ impl<T: HighResolutionCaptureCompare16bitInstance, C: AdvancedChannel<T>> Bridge
}
fn update_primary_duty_or_dead_time(&mut self) {
self.min_secondary_duty = self.primary_duty + self.dead_time;
T::regs().tim(C::raw()).cmp(0).modify(|w| w.set_cmp(self.primary_duty));
T::regs()
.tim(C::raw())
.cmp(1)
.modify(|w| w.set_cmp(self.primary_duty + self.dead_time));
.modify(|w| w.set_cmp(self.min_secondary_duty));
}
/// Set the dead time as a proportion of the maximum compare value
pub fn set_dead_time(&mut self, dead_time: u16) {
self.dead_time = dead_time;
self.max_secondary_duty = self.get_max_compare_value() - dead_time;
self.update_primary_duty_or_dead_time();
}
@ -309,9 +316,17 @@ impl<T: HighResolutionCaptureCompare16bitInstance, C: AdvancedChannel<T>> Bridge
/// The secondary duty is the period in any switch is active
///
/// If less than or equal to the primary duty, the secondary switch will never be active
/// If less than or equal to the primary duty, the secondary switch will be active for one tick
/// If a fully complementary output is desired, the secondary duty can be set to the max compare
pub fn set_secondary_duty(&mut self, secondary_duty: u16) {
let secondary_duty = if secondary_duty > self.max_secondary_duty {
self.max_secondary_duty
} else if secondary_duty <= self.min_secondary_duty {
self.min_secondary_duty + 1
} else {
secondary_duty
};
T::regs().tim(C::raw()).cmp(2).modify(|w| w.set_cmp(secondary_duty));
}
}